F.N.B. (FNB) 424B5Prospectus supplement for primary offering

Filed Pursuant to Rule 424(b)(5)
File No. 333-281868

This preliminary prospectus supplement relates to an effective registration statement under the Securities Act of 1933 and is subject to completion. This preliminary prospectus supplement and the accompanying prospectus do not constitute an offer to sell or the solicitation of an offer to buy nor shall there be any sale of these securities in any jurisdiction in which solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such jurisdiction.

SUBJECT TO COMPLETION

PRELIMINARY PROSPECTUS SUPPLEMENT DATED DECEMBER 4, 2024

PROSPECTUS SUPPLEMENT

(To Prospectus dated August 30, 2024)

$    

% Fixed Rate / Floating Rate Senior Notes due 2030

We are offering $    aggregate principal amount of our  % Fixed Rate / Floating Rate Senior Notes due 2030 (which we refer to as the “notes”). The notes will mature on     , 2030. The notes will initially bear interest at  % per annum, payable semi-annually in arrears on     and     of each year, to, but excluding,     , 2029. Commencing on     , 2029, the notes will bear interest at a floating rate per annum equal to Compounded SOFR (determined with respect to each quarterly interest period using the SOFR Index as described herein under “Description of the Notes—Compounded SOFR”) plus  %, payable quarterly in arrears on     , 2030,     , 2030,     , 2030, and at the maturity date. Prior to     , 2029 (one year prior to the maturity date), we may, at our option, redeem the notes, in whole or in part, at any time and from time to time, by paying the aggregate principal amount of the notes to be redeemed plus a “make whole” premium (as described herein under “Description of the Notes—Optional Redemption”) plus accrued and unpaid interest thereon, if any, to, but excluding, the redemption date. On     , 2029 (one year prior to the maturity date), we may redeem the notes, in whole, but not in part, by paying the aggregate principal amount of the notes to be redeemed plus accrued and unpaid interest thereon, if any, to, but excluding, the redemption date. At any time and from time to time on or after      , 2030 (30 days prior to the maturity date), we may redeem the notes in whole or in part by paying the aggregate principal amount of the notes to be redeemed plus accrued and unpaid interest thereon, if any, to, but excluding, the redemption date. There is no sinking fund for the notes.

The notes will be senior unsecured obligations of F.N.B. Corporation and will rank equally with all of our other existing and future senior unsecured indebtedness. The notes will not be guaranteed by any of our subsidiaries.

See “Risk Factors” on page S-5 to read about important factors you should consider before buying notes.

The notes are not savings accounts, deposits or other obligations of our subsidiary bank, First National Bank of Pennsylvania (“FNBPA”), or any of our non-bank subsidiaries. The notes are not insured by the Federal Deposit Insurance Corporation (the “FDIC”) or any other governmental agency or public or private insurer.

Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of these securities or determined that this prospectus supplement or the accompanying prospectus is truthful or complete. Any representation to the contrary is a criminal offense.

The notes will not be listed on any securities exchange. Currently, there is no public trading market for the notes.

The underwriters expect to deliver the notes to purchasers in book-entry form through the facilities of The Depository Trust Company and its direct participants, including Euroclear Bank S.A./N.V., as operator of the Euroclear System (“Euroclear”), and Clearstream Banking, a société anonyme (“Clearstream”), on or about    , 2024.

Joint Book-Running Managers

The date of this prospectus supplement is     , 2024

TABLE OF CONTENTS

PROSPECTUS

ABOUT THIS PROSPECTUS SUPPLEMENT

This document consists of two parts. The first part is this prospectus supplement, which describes the specific terms of this offering. The second part is the accompanying prospectus, which is part of a registration statement that we filed with the SEC using a “shelf” registration process. The accompanying prospectus describes more general information, some of which may not apply to this offering. Generally, when we refer to the “prospectus,” we are referring to both the prospectus supplement and the accompanying prospectus combined. You should read both this prospectus supplement and the accompanying prospectus, together with the additional information described under the headings “Where You Can Find More Information” and “Incorporation of Certain Documents by Reference.”

If the description of the offering varies between this prospectus supplement and the accompanying prospectus, you should rely on the information in this prospectus supplement and any free writing prospectus prepared by us.

Any statement made in this prospectus supplement or in a document incorporated or deemed to be incorporated by reference in this prospectus supplement will be deemed to be modified or superseded for purposes of this prospectus supplement to the extent that a statement contained in this prospectus supplement or in any other subsequently filed document that is also incorporated or deemed to be incorporated by reference in this prospectus supplement modifies or supersedes that statement. Any statement so modified or superseded will not be deemed, except as so modified or superseded, to constitute a part of this prospectus supplement. See “Incorporation of Certain Documents by Reference.”

We have not authorized any person to provide you with any information or to make any representation other than as contained in this prospectus supplement, the accompanying prospectus and the information incorporated by reference herein and therein or in any free writing prospectus prepared by us. We do not take any responsibility for and can provide no assurance as to the reliability of, any information that others may provide you. The information appearing or incorporated by reference in this prospectus is accurate only as of the date of this prospectus or any accompanying prospectus supplement or the date of the document in which incorporated information appears. Our business, financial condition, results of operations and prospects may have changed since those dates.

This prospectus contains summaries of certain provisions contained in some of the documents described herein, but reference is made to the actual documents for complete information. All of the summaries are qualified in their entirety by the actual documents. Copies of the documents referred to herein have been filed, or will be filed or incorporated by reference as exhibits to the registration statement of which this prospectus is a part, and you may obtain copies of those documents as described below under “Where You Can Find More Information”.

Unless otherwise indicated or unless the context requires otherwise, all references in this prospectus to “F.N.B.,” the “Corporation,” “we,” “us,” “our” or similar references mean F.N.B. Corporation and its subsidiaries.

Neither this prospectus supplement nor the accompanying prospectus constitutes an offer, or an invitation on our behalf or on behalf of the underwriters, to subscribe for and purchase any of the notes and may not be used for or in connection with an offer or solicitation by anyone, in any jurisdiction in which such an offer or solicitation is not authorized or to any person to whom it is unlawful to make such an offer or solicitation.

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WHERE YOU CAN FIND MORE INFORMATION

We are subject to the reporting requirements of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), and file annual, quarterly and current reports, proxy statements and other information with the Securities and Exchange Commission (the “SEC”). The SEC maintains an internet site that contains reports, proxy and information statements and other information about issuers, like us, who file electronically with the SEC. The SEC’s website is http://www.sec.gov.

We have filed with the SEC a registration statement on Form S-3 under the Securities Act of 1933, as amended (the “Securities Act”), covering the securities described in this prospectus supplement and the accompanying prospectus. As permitted by SEC rules, this prospectus supplement and the accompanying prospectus do not contain all of the information included in the registration statement, some of which is contained in exhibits included with or incorporated by reference in the registration statement. The registration statement, including the exhibits contained or incorporated by reference therein, can be read at the SEC’s website.

We make available, free of charge, on or through our website at www.fnbcorporation.com, our Annual Reports on Form 10-K, Quarterly Reports on Form 10-Q and Current Reports on Form 8-K that are filed with or furnished to the SEC, and amendments to those reports, as soon as reasonably practicable after we electronically file such reports with, or furnish them to, the SEC. The contents of our website are not part of this prospectus, and we have included our website address as an inactive textual reference only. Information on, or accessible through, our website is not incorporated by reference into this prospectus.

INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE

The SEC allows us to “incorporate by reference” in this prospectus supplement the information in documents that we file with the SEC. This means that we can disclose important information to you by referring you to those documents. The following documents that we have filed with the SEC are incorporated by reference in, and considered a part of, this prospectus supplement:

We are also incorporating by reference in this prospectus supplement all other documents (other than current reports furnished under Item 2.02 or Item 7.01 of Form 8-K and exhibits filed on such form that are related to such items) that we file with the SEC pursuant to Sections 13(a), 13(c), 14 or 15(d) of the Exchange Act on or after the date of this prospectus supplement and prior to the termination or completion of any offering of notes under this prospectus supplement.

We will provide to each person, including any beneficial owner, to whom a copy of this prospectus is delivered, at no cost, upon oral or written request, a copy of any or all documents referred to above that have been or may be incorporated by reference into this prospectus supplement (excluding the exhibits to those documents unless they have been specifically incorporated by reference into the requested document). You may request these documents from:

Investor Relations

626 Washington Place

Pittsburgh, Pennsylvania 15219

412-385-4773

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CAUTIONARY STATEMENT REGARDING FORWARD-LOOKING INFORMATION

This prospectus supplement, the accompanying prospectus and the documents incorporated by reference herein and therein may contain statements regarding our outlook for earnings, revenues, expenses, tax rates, capital and liquidity levels and ratios, asset quality levels, financial position and other matters regarding or affecting our current or future business and operations. These statements can be considered “forward-looking statements” within the meaning of Section 27A of the Securities Act, and Section 21E of the Exchange Act. These forward-looking statements involve various assumptions, risks and uncertainties which can change over time. Actual results or future events may be different from those anticipated in our forward-looking statements and may not align with historical performance and events. As forward-looking statements involve significant risks and uncertainties, caution should be exercised against placing undue reliance upon such statements. Forward-looking statements are typically identified by words such as “believe,” “plan,” “expect,” “anticipate,” “intend,” “outlook,” “estimate,” “forecast,” “will,” “should,” “project,” “goal,” and other similar words and expressions. We do not assume any duty to update forward-looking statements, except as required by federal securities laws.

Our forward-looking statements are subject to the following principal risks and uncertainties:

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We caution that the risks identified here are not exhaustive of the types of risks that may adversely impact us and actual results may differ materially from those expressed or implied as a result of these risks and uncertainties, including, but not limited to, the risk factors and other uncertainties described under Item 1A. Risk Factors and the Risk Management sections of our 2023 Annual Report on Form 10-K (including the Management’s Discussion and Analysis section), our subsequent 2024 Quarterly Reports on Form 10-Q (including the risk factors and risk management discussions) and our other 2024 filings with the SEC, which are available on our corporate website at https://www.fnb-online.com/about-us/investor-information/reports-and-filings or the SEC’s website at www.sec.gov. We have included our web address as an inactive textual reference only. Information on our website is not part of our SEC filings.

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RISK FACTORS

Investing in the notes involves various risks. You should carefully consider the risks and uncertainties described below and in our Annual Report on Form 10-K for the fiscal year ended December 31, 2023 and the other information included and incorporated by reference in this prospectus supplement and the accompanying prospectus before deciding whether to purchase the notes. Our future business, results of operations, financial condition, capital levels, liquidity and cash flows could be materially and adversely affected by any of these risks. These risks are not the only risks that we face. Our business operations could also be affected by additional factors that are not presently known to us or that we currently consider to be immaterial to our operations. See also the discussion under the heading “Cautionary Statement Regarding Forward-Looking Information.” For purposes of this section, references to “F.N.B. Corporation,” the “Corporation,” “we,” “us” or “our” include only F.N.B. Corporation and not any of its subsidiaries. The Indenture referred to below is described in “Description of the Notes.”

The notes will be obligations of F.N.B. Corporation and not obligations of our subsidiaries and will be structurally subordinated to the debt of our subsidiaries, which will not guarantee the notes.

We are a holding company and depend on our subsidiaries, principally our subsidiary bank, for funds to pay principal and interest on the notes. The notes are not guaranteed by any of our subsidiaries and will be structurally subordinated to all existing and future liabilities of our subsidiaries owed to third parties, including the bank deposits of our subsidiary bank. Therefore, our rights and the rights of our creditors, including holders of the notes, to participate in the assets of our subsidiaries in the event a subsidiary is liquidated or reorganized are subject to the prior claims of such subsidiary’s other creditors. As a result, all indebtedness and other liabilities of our subsidiaries owed to third parties, whether secured or unsecured, must be satisfied before any of the assets of such subsidiaries would be available to us for distribution, upon a liquidation, insolvency, bankruptcy, receivership or similar event affecting our subsidiaries, in order for us to meet our obligations with respect to the notes.

As of September 30, 2024, our subsidiaries’ total borrowings (including deposits) were approximately $40.8 billion (including FNB debt). Our subsidiaries may incur additional deposits, indebtedness and liabilities without restriction under the Indenture governing the notes, all of which will be structurally senior to the notes.

We are a legal entity separate and distinct from our banking and other subsidiaries and will rely on such subsidiaries to provide funds to pay the notes.

Our principal source of cash, including cash to pay dividends to our shareholders and to pay principal and interest on our indebtedness, is dividends from our banking subsidiary, FNBPA. There are various statutory, regulatory and other limitations on the extent to which FNBPA and our other subsidiaries can provide funds to us by dividend or otherwise. Although we maintain cash positions for liquidity at the holding company level, if FNBPA or other of our subsidiaries were unable to pay dividends to us, over time, we may not be able to pay principal and interest to holders of the notes. Generally, our regulators expect us to pay dividends out of current earnings and to maintain sufficient capital. Federal banking law prohibits national banks from paying dividends in excess of the sum of current year earnings and retained earnings for the prior two years without prior approval of the OCC. Contractual or other restrictions may also limit our subsidiaries’ abilities to pay dividends or make distributions, loans or advances to us. For these reasons, we may not have access to any assets or cash flow of our subsidiaries to make payments on the notes.

Because we are a holding company, our rights and the rights of our creditors, including the holders of the notes, to participate in the assets of any subsidiary during its liquidation or reorganization will be subject to the prior claims of the subsidiary’s creditors unless we are ourselves a creditor with recognized claims against the subsidiary. Any capital loans that we make to any of our banking subsidiaries would be subordinate in right of payment to deposits and to other indebtedness of those banking subsidiaries. Claims from creditors (other than

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us) against the subsidiaries may include long-term and medium-term debt and substantial obligations related to deposit liabilities, federal funds purchased, securities sold under repurchase agreements, and other short-term borrowings. The notes are not obligations of, nor guaranteed by, our subsidiaries and our subsidiaries have no obligation to pay any amounts due on the notes. The Indenture relating to the notes does not limit the ability of our subsidiaries to issue or incur additional debt.

At September 30, 2024, FNBPA could legally pay up to $479 million in dividends to us without prior OCC approval. See “Business—Government Supervision and Regulation,” “Risk Factors—We are dependent on dividends from our subsidiaries to meet our financial obligations and pay dividends to stockholders,” and “Risk Factors—Regulatory authorities may restrict our ability to pay dividends on and repurchase our common stock” in our Annual Report on Form 10-K for the year ended December 31, 2023 for a discussion of regulatory and other restrictions on dividend declarations.

The Indenture governing the notes has limited covenants, which may not protect your investment.

Neither we nor any of our subsidiaries is restricted from incurring additional debt or other liabilities, including additional senior debt, under the Indenture pursuant to which we will issue the notes. If we incur additional debt or liabilities, our ability to pay our obligations on the notes could be adversely affected. We expect to incur, from time to time, additional debt and other liabilities. In addition, we are not restricted under the indenture from granting security interests over our assets, except to the extent described under “Description of the Notes—Consolidation, Merger, Conveyance or Transfer of Assets” and “—Certain Covenants” in this prospectus supplement, or from paying dividends or issuing or repurchasing our securities.

In addition, there are no financial covenants in the Indenture. You are not protected under the Indenture in the event of a highly leveraged transaction, reorganization, a default under our existing indebtedness, restructuring, merger or similar transaction that may adversely affect you, except to the extent described under “Description of the Notes—Consolidation, Merger, Conveyance or Transfer of Assets” and “—Certain Covenants” in this prospectus supplement.

If an active and liquid trading market for the notes does not develop or does not continue, the market price of the notes may decline and you may be unable to sell your notes.

The notes are a new issue of securities for which there is currently no public market. We do not intend to list the Notes on any national securities exchange or include the notes in any automated quotation system. An active trading market may not develop or be maintained for the notes. Although the underwriters have indicated that they intend to make a secondary market in the notes, they are not obligated to do so and may, in their sole discretion without notice, discontinue market making activities at any time, which could negatively impact your ability to sell the notes or the prevailing market price at the time you choose to sell. Even if a trading market for the notes develops, the market may be limited and illiquid. The liquidity of a trading market in the notes, if any, and the future trading prices of the notes will depend on many factors, including the prevailing interest rates, the market for similar securities, general economic conditions and our financial condition, liquidity, creditworthiness, performance and prospects, including whether we have missed any interest payments or are restricted from paying interest on the notes by our regulators. If an active trading market does not develop or does not continue, you may be unable to resell your notes or may only be able to sell them at a substantial discount from your purchase price.

General market conditions and unpredictable factors could adversely affect market prices for the notes.

If you purchase notes, the notes may subsequently trade at a discount to the price that you paid for them. Several factors, many of which are beyond our control, may influence the market price of the notes, including, but not limited to:

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As these factors are interrelated in complex ways, the effect of any one factor may be offset, in whole or in part, or magnified by the effect of another factor. For example, an improvement in our credit rating could be offset by increases in interest rates. The condition of the financial markets and prevailing interest rates have fluctuated significantly in the past and are likely to fluctuate in the future. Such fluctuations could have an adverse effect on the market price of the notes.

Our credit rating may not reflect all risks of an investment in the notes.

Any credit rating assigned to the notes will be limited in scope and does not address or reflect all material risks relating to an investment in the notes, but rather reflects only the view of the rating agency at the time it issues the rating. In addition, credit rating agencies continually review their ratings for the companies that they follow, including us. Credit rating agencies also evaluate the financial services industry as a whole and may change their credit rating for us and our securities, including the notes, based on their overall view of our industry. Accordingly, there can be no assurance that a credit rating will remain in effect for any given period of time or that a rating will not be put on watch with negative implications, lowered, suspended or withdrawn entirely by the applicable rating agency if, in such rating agency’s judgment, circumstances so warrant. Credit ratings are not a recommendation to buy, sell or hold any securities, including the notes, and may be revised or withdrawn at any time by the credit rating organization in its sole discretion. A downgrade, withdrawal or the announcement of a possible downgrade or withdrawal in a rating assigned to, or a “watch” or similar action with respect to, the notes, us or our other securities, or any perceived decrease in our creditworthiness could cause the trading price of our securities to decline significantly, impact access to capital markets and/or increase the cost of debt, thereby adversely affect liquidity and financial conditions. Conversely, because your return on the notes depends upon factors in addition to our ability to pay our obligations, an improvement in our credit rating will not necessarily reduce the other investment risks related to the notes.

The notes are not deposits and will not be insured or guaranteed by the FDIC.

The notes are not savings accounts, deposits or other obligations of FNBPA, or any of our non-bank subsidiaries. The notes are not insured by the FDIC, or any other governmental agency or public or private insurer.

The notes may present certain risks related to an investment by employee benefit plans and individual retirement accounts.

Any fiduciary of a pension, profit sharing or 401(k) plan, health or welfare plans or other employee benefit plan that is considering investing in the notes with the assets of such plans should consult with its counsel

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regarding whether the investment in the notes could be a “prohibited transaction” or cause such fiduciary to fail to satisfy the fiduciary standards of conduct and other applicable requirements under the U.S. Employee Retirement Income Security Act of 1974, as amended (“ERISA”), the U.S. Internal Revenue Code of 1986, as amended (the “Code”), or other applicable statutory or common law, which may result in the imposition of civil penalties and excise taxes and can subject the fiduciary to liability for any resulting losses as well as equitable remedies. Prospective investors that are benefit plan investors should read the section hereof entitled “Certain Considerations Applicable to ERISA, Governmental and Other Plan Investors” in its entirety for a discussion of certain risks related to an investment by benefit plan investors in the notes.

The interest rate on the notes will reset from fixed to floating rates.

During the period from, and including, the issue date to, but excluding,    , 2029, the notes will bear interest at a fixed rate of  % per annum. However, during the period from, and including    , 2029, to, but excluding, the maturity date, the notes will bear interest at a floating rate per annum in accordance with the formula set forth under “Description of the Notes—Compounded SOFR,” plus  %. As a result, the interest rate in any floating rate period may be less than the initial interest rate or the interest rate that applies in the preceding interest period, which would affect the amount of any interest payments under the notes and, therefore, could affect their market value.

The amount of interest payable with respect to each interest period during the floating rate period will be determined near the end of such interest period for the notes.

The interest rate with respect to any interest period during the floating rate period will only be capable of being determined near the end of such interest period in relation to the notes. Consequently, it may be difficult for investors in the notes to estimate reliably the amount of interest that will be payable on the notes. In addition, some investors may be unwilling or unable to trade the notes without changes to their information technology systems, both of which could adversely impact the liquidity and trading price of the notes.

The interest rate on the notes during the floating rate period will be based on a compounded SOFR, which will be determined by reference to the SOFR Index, a relatively new market index.

For each interest period during the floating rate period, the interest rate on the notes will be based on a compounded SOFR rate calculated by reference to the SOFR Index (as defined below) using the specific formula described in this prospectus supplement, not the SOFR rate published on or in respect of a particular date during such period or an average of SOFR rates during such period. The SOFR Index measures the cumulative impact of compounding the daily secured overnight financing rate (“SOFR”) as provided by the Federal Reserve Bank of New York (the “FRBNY”). The value of the SOFR Index on a particular business day reflects the effect of compounding SOFR on such business day and allows the calculation of compounded SOFR averages over custom time periods. For this and other reasons, the interest rate during any Observation Period (as defined below) will not be the same as the interest rate on other SOFR-linked investments that use an alternative basis to determine the applicable interest rate. Further, if the SOFR rate in respect of a particular date during the Observation Period for an interest period is negative, its contribution to the SOFR Index will be less than one, resulting in a reduction in the Compounded SOFR (as defined below) used to calculate the interest rate on the notes during the relevant interest period. In addition, the method for calculating an interest rate based upon SOFR in market precedents varies. If the market predominantly adopts a different calculation method, the liquidity and market value of the notes may be adversely affected.

SOFR has a limited history and its historical performance is not indicative of future performance.

The FRBNY began to publish SOFR in April 2018. Although the FRBNY has also begun publishing historical indicative SOFR going back to 2014, such historical indicative data inherently involves assumptions, estimates and approximations. Therefore, SOFR has limited performance history and no actual investment based

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on the performance of SOFR was possible before April 2018. The level of SOFR during the floating rate period for the notes may bear little or no relation to the historical level of SOFR. The future performance of SOFR is impossible to predict and, therefore, no future performance of SOFR or the notes may be inferred from any of the hypothetical or actual historical performance data. Hypothetical or actual historical performance data are not indicative of the future performance of SOFR or the notes. Changes in the levels of SOFR will affect Compounded SOFR and, therefore, the return on the notes and the trading price of such notes, but it is impossible to predict whether such levels will rise or fall. There can be no assurance that SOFR or Compounded SOFR will be positive.

The composition and characteristics of SOFR are not the same as those of U.S. dollar LIBOR and any failure of SOFR to maintain market acceptance could adversely affect the notes.

SOFR was developed for use in certain U.S. dollar derivatives and other financial contracts as an alternative to the U.S. dollar London interbank offered rate (“U.S. dollar LIBOR”) in part because it is considered representative of general funding conditions in the overnight Treasury repurchase (repo) market. However, as a rate based on transactions secured by U.S. Treasury securities, SOFR does not measure bank-specific credit risk and, as a result, is less likely to correlate with the unsecured short-term funding costs of banks. In addition, SOFR is an overnight rate, while U.S. dollar LIBOR represented interbank funding over different maturities. As a result, SOFR will likely not perform in the same way as U.S. dollar LIBOR would have at any time, including, without limitation, as a result of changes in interest and yield rates in the market, market volatility, or global or regional economic, financial, political, regulatory, judicial or other events.

The differences between SOFR and U.S. dollar LIBOR may mean that market participants would not consider SOFR a suitable substitute, replacement or successor for all of the purposes for which U.S. dollar LIBOR historically has been used (including, without limitation, as a representation of the unsecured short-term funding costs of banks), which may, in turn, lessen market acceptance of SOFR. Any failure of SOFR to maintain market acceptance could adversely affect the return on and value of the notes and the price at which you can sell the notes.

Further, other index providers are developing products that are perceived as competing with SOFR. It is possible that market participants will prefer one of these competing products and that such competing products may become more widely accepted in the marketplace than SOFR. To the extent market acceptance for SOFR as a benchmark for floating rate notes declines, the return on and value of the notes and the price at which investors can sell their notes in the secondary market could be adversely affected. In addition, investors in the notes may not be able to sell their notes at all or may not be able to sell their notes at prices that will provide them with a yield comparable to similar investments that have a developed secondary market, and may consequently suffer from increased pricing volatility and market risk.

As of the date of this prospectus supplement, there are multiple market conventions with respect to the implementation of SOFR as a base rate for floating rate notes or other securities. The manner of calculation and related conventions with respect to the determination of interest rates based on SOFR in floating rate notes markets may differ materially compared with the manner of calculation and related conventions with respect to the determination of interest rates based on SOFR in other markets, such as the derivatives and loan markets. Investors should consider carefully how any potential inconsistencies between the manner of calculation and related conventions with respect to the determination of interest or other payment rates based on SOFR across these markets may impact any hedging or other financial arrangements that they may put in place in connection with any acquisition, holding or disposition of the notes.

The price at which the notes may be sold prior to maturity will depend on a number of factors and may be substantially less than the amount for which they were originally purchased.

Some of the factors that may affect the price at which the notes may be sold prior to maturity include, but are not limited to: (i) actual or anticipated changes in the level of SOFR, (ii) volatility of the level of SOFR,

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(iii) changes in interest and yield rates, (iv) any actual or anticipated changes in our credit ratings or credit spreads and (v) the time remaining to maturity of such notes. Generally, the longer the time remaining to maturity and the more tailored the exposure, the more the market price of the notes will be affected by the other factors described in the preceding sentence. This can lead to significant adverse changes in the market price of securities like the notes. Depending on the actual or anticipated level of SOFR, the market value of the notes may decrease and you may receive substantially less than 100% of the issue price if you are able to sell your notes prior to maturity.

The administrator of SOFR may make changes that could change the value of SOFR or discontinue SOFR and has no obligation to consider the interests of the investors in the notes in doing so.

The FRBNY, as administrator of SOFR, may make methodological or other changes that could change the value of SOFR, including changes related to the method by which SOFR is calculated, eligibility criteria applicable to the transactions used to calculate SOFR, or timing related to the publication of SOFR. In addition, the administrator may alter, discontinue or suspend calculation or dissemination of SOFR (in which case a fallback method of determining the interest rate on the notes as further described under “Description of the Notes—Effect of Benchmark Transition Event” will apply). The administrator has no obligation to consider the interests of investors in the notes in calculating, adjusting, converting, revising or discontinuing SOFR.

If SOFR is discontinued, the notes will bear interest during the floating rate period by reference to a different base rate, which could adversely affect the value of the notes, the return on the notes and the trading price of the notes; there can be no guarantee that any Benchmark Replacement (as defined below) will be a comparable substitute for SOFR.

If we or our designee determines that a Benchmark Transition Event (as defined below) and its related Benchmark Replacement Date (as defined below) have occurred with respect to the notes, then the interest rate on the notes during the floating rate period will no longer be determined by reference to the SOFR Index, but instead will be determined by reference to a different rate, plus a spread adjustment, which we refer to as a “Benchmark Replacement,” as described herein under “Description of the Notes—Effect of Benchmark Transition Event.” The selection of a Benchmark Replacement, and any decisions, determinations or elections made by us or our designee in connection with implementing a Benchmark Replacement with respect to the notes in accordance with this prospectus supplement could result in adverse consequences to the applicable interest rate on the notes, which could adversely affect the return on, value of and market for the notes.

If a particular Benchmark Replacement (as defined below) or Benchmark Replacement Adjustment (as defined below) cannot be determined, then the next available Benchmark Replacement or Benchmark Replacement Adjustment will apply. These replacement rates and adjustments may be selected, recommended or formulated by (i) the Relevant Governmental Body (as defined below) (such as the Alternative Reference Rates Committee), (ii) the International Swaps and Derivatives Association, Inc. (“ISDA”) or (iii) in certain circumstances, us or our designee.

In addition, the terms of the notes expressly authorize us or our designee to make Benchmark Replacement Conforming Changes (as defined below) with respect to, among other things, the determination of interest payment periods and the timing and frequency of determining rates and making payments of interest and other administrative matters. The application of a Benchmark Replacement and Benchmark Replacement Adjustment, and any implementation of Benchmark Replacement Conforming Changes, could result in adverse consequences to the amount of interest payable on the notes, which could adversely affect the return on, value of and market for the notes. Further, there is no assurance that the characteristics of any Benchmark Replacement will be similar to the then-current Benchmark that it is replacing, that any Benchmark Replacement will produce the economic equivalent of the then-current Benchmark that it is replacing, that securities linked to any Benchmark Replacement will gain market acceptance, or that the administrator for any Benchmark Replacement (or any reference rate underlying a Benchmark Replacement) will not make changes to the reference rate or discontinue

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administration of the Benchmark Replacement (or any underlying reference rate), all of which could adversely affect the value of and market for the notes.

SOFR may be more volatile than other benchmark or market rates.

Since the initial publication of SOFR, daily changes in the rate have, on occasion, been more volatile than daily changes in other benchmark or market rates, such as U.S. dollar LIBOR, during corresponding periods, and the return on, value of and market for the notes may fluctuate more than floating rate debt securities with interest rates based on less volatile rates.

We or our designee will make certain determinations with respect to the notes, which determinations may adversely affect the notes.

We or our designee will make certain determinations with respect to the notes as described herein under “Description of the Notes—Compounded SOFR.” For example, if a Benchmark Transition Event and its related Benchmark Replacement Date have occurred, we or our designee will make certain determinations with respect to the notes in our or our designee’s sole discretion as described herein under “Description of the Notes—Compounded SOFR.” In addition, we or an affiliate of ours may assume the duties of the Calculation Agent (as defined below) for the notes during the floating rate period. In making any required determinations, potential conflicts of interest may exist between us, or our designee (which may be our affiliate), and you. Any of these determinations may adversely affect the value of the notes, the return on the notes and the price at which you can sell the notes. Moreover, certain determinations may require the exercise of discretion and the making of subjective judgments, such as with respect to the base rate or the occurrence or non-occurrence of a Benchmark Transition Event and any Benchmark Replacement Conforming Changes. These potentially subjective determinations will be made by us or our designee. These potentially subjective determinations may adversely affect the value of the notes, the return on the notes and the price at which you can sell the notes. For further information regarding these types of determinations, see “Description of the Notes—Compounded SOFR.”

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USE OF PROCEEDS

We estimate that the net proceeds from the sale of the notes offered hereby, after deducting the underwriting discounts and certain offering expenses, will be approximately $    million. We intend to use the net proceeds from the sale of the notes for general corporate purposes, which may include investments at the holding company level, capital to support the growth of FNBPA and refinancing of outstanding indebtedness.

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CAPITALIZATION

The following table sets forth our capitalization as of September 30, 2024:

You should read this table together with our consolidated financial statements (including the notes thereto) incorporated by reference in this prospectus supplement and the accompanying prospectus. See “Where You Can Find More Information” and “Incorporation of Certain Documents by Reference.”

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CERTAIN REGULATORY CONSIDERATIONS

General

As a bank holding company, we are subject to regulation and supervision by the Federal Reserve System, which has supervisory, regulatory and enforcement authority over us. Among other responsibilities, this authority permits the Federal Reserve to restrict or prohibit activities that are determined to be a risk to FNB and FNBPA. The Federal Reserve examines us periodically and prepares reports for the consideration of our board of directors on any operating deficiencies that they may identify. While the Federal Reserve historically has expected bank holding companies to act as a source of strength to their bank subsidiaries, effective July 21, 2011, we are also required by the Dodd-Frank Act to act as a source of strength for FNBPA and for any other depository institution subsidiary we may have in the future. Such support may be required at times when a holding company may not otherwise be inclined to provide it.

FNBPA is examined, supervised and subject to regulatory and enforcement authority by the OCC and its deposits are insured by the FDIC. The OCC’s supervisory, regulatory and enforcement authority permits the agency to restrict or prohibit FNBPA’s activities that are determined to be a risk to the bank, including limiting or prohibiting dividend payment by the bank. Our relationships with our depositors, borrowers and other customers are also regulated by federal and state laws and agencies, especially in matters concerning consumer protection, privacy, anti-money laundering, the ownership of deposit accounts and various trust and other customer relationships.

For a discussion of the regulatory framework applicable to bank holding companies and their subsidiaries and specific information relevant to FNBPA, please refer to our Annual Report on Form 10-K for the year ended December 31, 2023 and our Quarterly Reports on Form 10-Q for the quarters ended March 31, 2024, June 30, 2024 and September 30, 2024, and any subsequent reports we file with the SEC, which are incorporated by reference in this prospectus supplement. This regulatory framework is intended primarily for the protection of depositors and the FDIC’s Deposit Insurance Funds and not for the protection of our security holders. A change in applicable statutes, regulations or regulatory policy may have a material adverse effect on our business, financial condition (including capital adequacy) and results of operations.

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DESCRIPTION OF THE NOTES

The notes will be a series of our senior debt securities. The notes offered by this prospectus supplement will be issued by F.N.B. Corporation under an indenture dated as of February 24, 2020 (the “Base Indenture”), as supplemented by a third supplemental indenture to be dated as of    , 2024, between us and Wilmington Trust, National Association, as trustee (the “Trustee”). We refer to the Base Indenture, together with the third supplemental indenture, as the “Indenture.” The following description of the notes and the Indenture may not be complete and is subject to and qualified in its entirety by reference to all of the provisions of the notes and the Indenture. Wherever we refer to particular sections or defined terms of the Indenture, it is our intent that those sections or defined terms will be incorporated by reference in this prospectus supplement. We urge you to read these documents because they, and not this description, define your rights as a holder of the notes. For purposes of this section, references to “F.N.B. Corporation,” the “Corporation,” “we,” “us” or “our” include only F.N.B. Corporation and not any of its subsidiaries.

General

The notes issued in this offering initially will be limited to $    principal amount. The notes will mature at 100% of their principal amount on    , 2030 (the “maturity date”). The notes will not be subject to repayment at the option of the holder at any time prior to maturity and will not be entitled to any sinking fund. The notes are not convertible into, or exchangeable for, equity securities of FNB. The notes will be issued in fully registered book-entry form without coupons and in minimum denominations of $1,000 and integral multiples of $1,000 in excess thereof. We do not intend to apply for the listing of the notes on any securities exchange.

The notes will be unsecured and unsubordinated and will rank equally in priority among themselves and with all of our other existing and future unsecured and unsubordinated indebtedness, and senior in right of payment to all of our existing and future subordinated indebtedness. As of September 30, 2024, FNB (parent company only) had $349 million of outstanding senior unsecured indebtedness. FNB may from time to time, without notice or consent of the holders of the notes, incur additional secured or unsecured senior indebtedness ranking equally with the notes, as well as additional subordinated indebtedness ranking junior to the notes.

The notes will be our exclusive obligation and not the obligations of our subsidiaries. Our subsidiaries are separate and distinct legal entities. The notes will not be guaranteed by any of our subsidiaries. Our subsidiaries may, without notice or consent of the holders of the notes, incur additional debt or liabilities in the future, all of which would rank structurally senior to the notes.

The notes will be subject to defeasance under the conditions described below in “—Discharge, Defeasance and Covenant Defeasance.”

The notes are not savings accounts, deposits or other obligations of any of our bank or non-bank subsidiaries and are not insured by the FDIC, the Federal Reserve or any other governmental agency or instrumentality.

We may, without the consent of the holders of the notes, increase the principal amount of the notes by issuing additional notes in the future with the same terms and conditions, except for any differences in the issue date, the issue price and interest accrued prior to the date of issuance of the additional notes, and with the same CUSIP number as the notes offered by this prospectus supplement; provided that if any additional notes are not fungible with the notes offered by this prospectus supplement for U.S. federal income tax purposes, such additional notes will be issued under a separate CUSIP number. The notes offered by this prospectus supplement and any additional notes would rank equally and ratably and would be treated as a single series for all purposes under the Indenture.

The Indenture contains no financial covenants and does not restrict us from paying dividends, selling assets, making investments or issuing or repurchasing or redeeming other securities, and does not contain any provision

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that would provide protection to the holders of the notes against a sudden and dramatic decline in credit quality resulting from a merger, takeover, recapitalization or similar restricting or any other event involving us or our subsidiaries that may adversely affect our credit quality, except to the extent described under “Description of the Notes—Consolidation, Merger, Conveyance or Transfer of Assets” and “—Certain Covenants” included in this prospectus supplement. No recourse will be available for the payment of principal or, or interest on, any note, for any claim based thereon, or otherwise in respect thereof, against any shareholder, employee, officer or director, as such past, present or future, of F.N.B. Corporation or any successor entity.

Payments of principal and interest to owners of the book-entry interests described below are expected to be made in accordance with the procedures of The Depository Trust Company and its participants, including Clearstream Banking, société anonyme, and Euroclear Bank S.A./N.V., as operator of the Euroclear System.

Interest

Interest on the notes will accrue from, and including,     , 2024 (the “issue date”) to, but excluding, the first interest payment date and then from, and including, the immediately preceding interest payment date to which interest has been paid or duly provided for to, but excluding, the next interest payment date (or if the notes are redeemed during the period, the redemption date) or the maturity date, as the case may be. Each of these periods is referred to as an “interest period” for the notes.

During the period from, and including,     , 2024, to, but excluding,    , 2029 (the “fixed rate period”), the notes will bear interest at the rate of  % per annum. Such interest will be payable semi-annually in arrears on     and      of each year, beginning on      , 2025 and ending on     , 2029 (each such date, a “fixed interest payment date”). During the period from, and including,    , 2029, to, but excluding, the maturity date (the “floating rate period”), the notes will bear interest at a floating rate per annum equal to Compounded SOFR plus  %, as determined by the Calculation Agent in the manner described below. Such interest will be payable quarterly in arrears on     , 2030,     , 2030,     , 2030 and at the maturity date (each such date, a “floating interest payment date”). Compounded SOFR for each interest period in the floating rate period will be calculated by the Calculation Agent in accordance with the formula set forth below with respect to the Observation Period relating to such interest period.

The interest payable on the notes on any interest payment date, subject to certain exceptions, will be paid to the person in whose name the notes are registered at the close of business on    and    , whether or not a business day, immediately preceding the interest payment date; provided that if the notes are global notes held by DTC, the record date for such notes will be the close of business on the business day preceding the applicable interest payment date. However, interest that FNB pays on the maturity date or (subject to the exceptions described below under the heading “—Optional Redemption”) any redemption date will be paid to the person to whom the principal will be payable. Interest will be payable by wire transfer in immediately available funds in U.S. dollars at the office of the paying agent for the notes or, at FNB’s option in the event the notes are not represented by global notes (as described below), by check mailed to the address of the person specified for payment in the preceding sentences.

If an interest payment date or the maturity date for the notes falls on a day that is not a business day, FNB will postpone the interest payment or the payment of principal and interest at maturity to the next succeeding business day, but the payments made on such dates will be treated as being made on the date that the payment was first due and the holders of the notes will not be entitled to any further interest or other payments with respect to such postponements.

A “business day” means any day that is not a Saturday or Sunday, and that is not a day on which banking institutions in the State of New York or in the place of payment are authorized or obligated by law or executive order to close.

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For the fixed rate period, interest will be computed on the basis of a 360-day year consisting of twelve 30-day months. If any fixed interest payment date, any redemption date for the notes or the maturity date falls on a day which is not a business day, the related payment of principal or interest will be made on the next day that is a business day with the same force and effect as if made on the date such payment was due, and no interest will accrue on the amount payable for the period from and after such interest payment date, redemption date or maturity date, as the case may be.

For the floating rate period, interest will be computed on the basis of the actual number of days in each interest period (or any other relevant period) and a 360-day year. The amount of accrued interest payable on the notes for each interest period during the floating rate period will be computed by multiplying (i) the outstanding principal amount of the notes by (ii) the product of (a) the interest rate for the relevant interest period multiplied by (b) the quotient of the actual number of days in the applicable interest period divided by 360. The interest rate on the notes will in no event be higher than the maximum rate permitted by New York law as the same may be modified by United States law of general application and will in no event be lower than zero. For the floating rate period, if any floating interest payment date of the notes (other than the maturity date or any redemption date) falls on a day which is not a business day, that floating interest payment date will be postponed and the related payment of interest on the notes will be made on the next day which is a business day, except that if the next succeeding business day falls in the next calendar month, then such floating interest payment date will be advanced to the immediately preceding day that is a business day, and in each case, the related interest periods will also be adjusted for such non-business days.

The Calculation Agent will determine Compounded SOFR, the interest rate and accrued interest for each interest period in the floating rate period in arrears as soon as reasonably practicable on or after the Interest Payment Determination Date (as defined below) for such interest period and prior to the relevant floating interest payment date and will notify us (if we are not the Calculation Agent) of Compounded SOFR, such interest rate and accrued interest for each interest period in the floating rate period as soon as reasonably practicable after such determination, but in any event by the business day immediately prior to the relevant floating interest payment date. At the request of a holder of the notes, we will provide Compounded SOFR, the interest rate and the amount of interest accrued with respect to any interest period in the floating rate period, after Compounded SOFR, such interest rate and accrued interest have been determined. The Calculation Agent’s determination of any interest rate, and its calculation of interest payments for any interest period in the floating rate period, will be final and binding absent manifest error, will be maintained on file at the Calculation Agent’s designated office and will be provided in writing to the trustee.

Secured Overnight Financing Rate and the SOFR Index

SOFR is published by the FRBNY and is intended to be a broad measure of the cost of borrowing cash overnight collateralized by U.S. Treasury securities. The FRBNY reports that SOFR includes all trades in the Broad General Collateral Rate and bilateral Treasury repurchase agreement (repo) transactions cleared through the delivery-versus-payment service offered by the Fixed Income Clearing Corporation, a subsidiary of The Depository Trust and Clearing Corporation (“DTCC”), and SOFR is filtered by the FRBNY to remove some (but not all) of the foregoing transactions considered to be “specials.” According to the FRBNY, “specials” are repos for specific-issue collateral, which take place at cash-lending rates below those for general collateral repos because cash providers are willing to accept a lesser return on their cash in order to obtain a particular security.

The SOFR Index is published by the FRBNY and measures the cumulative impact of compounding SOFR on a unit of investment over time, with the initial value set to 1.00000000 on April 2, 2018, the first value date of SOFR. The SOFR Index value reflects the effect of compounding SOFR each business day and allows the calculation of compounded SOFR averages over custom time periods.

The FRBNY notes on its publication page for the SOFR Index that use of the SOFR Index is subject to important limitations, indemnification obligations and disclaimers, including that the FRBNY may alter the

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methods of calculation, publication schedule, rate revision practices or availability of the SOFR Index at any time without notice. The interest rate for any interest period during the floating rate period will not be adjusted for any modifications or amendments to the SOFR Index or SOFR data that the FRBNY may publish after the interest rate for that interest period has been determined.

Because SOFR is published by the FRBNY based on data received from other sources, we have no control over its determination, calculation or publication. The information regarding SOFR contained in this section is based upon the New York Federal Reserve’s Website and other U.S. government sources.

Compounded SOFR

With respect to any interest period during the floating rate period, “Compounded SOFR” will be determined by the Calculation Agent in accordance with the following formula (and the resulting percentage will be rounded, if necessary, to the nearest one hundred-thousandth of a percentage point):

where:

“SOFR Index Start” = For periods other than the initial interest period during the floating rate period, the SOFR Index value on the preceding Interest Payment Determination Date, and, for the initial interest period during the floating rate period, the SOFR Index value on the date that is two U.S. Government Securities Business Days before the first day of such initial interest period (such first day expected for the notes to be     , 2029);

“SOFR Index End” = The SOFR Index value on the Interest Payment Determination Date relating to the applicable floating interest payment date (or in the final interest period, relating to the maturity date, or, in the case of the redemption of the notes, relating to the applicable redemption date); and

“d” is the number of days in the relevant Observation Period.

For purposes of determining Compounded SOFR,

“Interest Payment Determination Date” means the date two U.S. Government Securities Business Days before each floating interest payment date (or, in the case of the redemption of the notes, preceding the applicable redemption date).

“Observation Period” means, in respect of each interest period during the floating rate period, the period from, and including, the date two U.S. Government Securities Business Days preceding the first date in such interest period to, but excluding, the date two U.S. Government Securities Business Days preceding the floating interest payment date for such interest period (or in the final interest period during the floating rate period, preceding the maturity date or, in the case of the redemption of the notes, preceding the applicable redemption date).

“SOFR Index” means, with respect to any U.S. Government Securities Business Day:

i. the SOFR Index value as published by the SOFR Administrator as such index appears on the SOFR Administrator’s Website at 3:00 p.m. (New York time) on such U.S. Government Securities Business Day (the “SOFR Index Determination Time”); or

ii. if a SOFR Index value does not so appear as specified in (1) above at the SOFR Index Determination Time, then: (i) if a Benchmark Transition Event and its related Benchmark Replacement Date have not occurred

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with respect to SOFR, Compounded SOFR shall be the rate determined pursuant to the “—SOFR Index unavailable provisions” described below; or (ii) if a Benchmark Transition Event and its related Benchmark Replacement Date have occurred with respect to SOFR, Compounded SOFR shall be the rate determined pursuant to the “—Effect of Benchmark Transition Event” provisions described below.

“SOFR” means the daily secured overnight financing rate as provided by the SOFR Administrator on the SOFR Administrator’s Website.

“SOFR Administrator” means the FRBNY (or a successor administrator of SOFR).

“SOFR Administrator’s Website” means the website of the FRBNY, currently at https://www.newyorkfed.org/markets/reference-rates/sofr, or any successor source. The information contained on such website is not part of this prospectus supplement and is not incorporated in this prospectus supplement by reference.

“U.S. Government Securities Business Day” means any day except for a Saturday, a Sunday or a day on which the Securities Industry and Financial Markets Association or any successor organization recommends that the fixed income departments of its members be closed for the entire day for purposes of trading in U.S. government securities.

Notwithstanding anything to the contrary in the indenture or the notes, if we or our designee determines on or prior to the relevant Reference Time (as defined below) that a Benchmark Transition Event and its related Benchmark Replacement Date have occurred with respect to determining SOFR, then the benchmark replacement provisions set forth below under “—Effect of Benchmark Transition Event” will thereafter apply to all determinations of the rate of interest payable on the notes.

For the avoidance of doubt, in accordance with the benchmark replacement provisions, after a Benchmark Transition Event and its related Benchmark Replacement Date have occurred, the interest rate for each interest period during the floating rate period will be an annual rate equal to the sum of the Benchmark Replacement plus  % for the notes.

SOFR Index Unavailable Provisions

If a SOFR Index Start or SOFR Index End is not published on the associated Interest Payment Determination Date and a Benchmark Transition Event and its related Benchmark Replacement Date have not occurred with respect to SOFR, “Compounded SOFR” means, for the applicable interest period in the floating rate period for which such index is not available, the rate of return on a daily compounded interest investment calculated in accordance with the formula for SOFR Averages, and definitions required for such formula, published on the SOFR Administrator’s Website at https://www.newyorkfed.org/markets/reference-rates/additional-information-about-reference-rates, or any successor source. For the purposes of this provision, references in the SOFR Averages compounding formula and related definitions to “calculation period” shall be replaced with “Observation Period” and the words “that is, 30-, 90-, or 180-calendar days” shall be removed. If SOFR does not so appear for any day “i” in the Observation Period (“SOFRi”), SOFRi for such day “i” shall be SOFR published in respect of the first preceding U.S. Government Securities Business Day for which SOFR was published on the SOFR Administrator’s Website.

Effect of Benchmark Transition Event

(1) Benchmark Replacement. If we or our designee determines that a Benchmark Transition Event and its related Benchmark Replacement Date have occurred on or prior to the Reference Time in respect of any determination of the Benchmark (as defined below) on any date, the Benchmark Replacement will replace the then-current Benchmark for all purposes relating to the notes in respect of such determination on such date and all determinations on all subsequent dates.

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(2) Benchmark Replacement Conforming Changes. In connection with the implementation of a Benchmark Replacement, we or our designee will have the right to make Benchmark Replacement Conforming Changes from time to time.

(3) Decisions and Determinations. Any determination, decision or election that may be made by us or our designee pursuant to the benchmark replacement provisions described herein, including any determination with respect to tenor, rate or adjustment, or the occurrence or non-occurrence of an event, circumstance or date and any decision to take or refrain from taking any action or any selection:

Any determination, decision or election pursuant to the benchmark replacement provisions shall be made by us or our designee (which may be our affiliate) on the basis as described above, and in no event shall the Calculation Agent be responsible for making any such determination, decision or election.

None of the Trustee or the Calculation Agent shall be under any obligation (i) to monitor, determine or verify the unavailability or cessation of SOFR or the SOFR Index, or whether or when there has occurred, or to give notice to any other transaction party of the occurrence of, any Benchmark Transition Event or related Benchmark Replacement Date, (ii) to select, determine or designate any Benchmark Replacement, or other successor or replacement benchmark index, or whether any conditions to the designation of such a rate or index have been satisfied, (iii) to select, determine or designate any Benchmark Replacement Adjustment, or other modifier to any replacement or successor index, or (iv) to determine whether or what Benchmark Replacement Conforming Changes are necessary or advisable, if any, in connection with any of the foregoing, including, but not limited to, adjustments as to any alternative spread thereon, the business day convention, interest determination dates or any other relevant methodology applicable to such substitute or successor benchmark. In connection with the foregoing, each of the Trustee and Calculation Agent shall be entitled to conclusively rely on any determinations made by us or our designee without independent investigation, and none of the Trustee or the Calculation Agent will have any liability for actions taken at our direction in connection therewith.

None of the Trustee or the Calculation Agent shall be liable for any inability, failure or delay on its part to perform any of its duties set forth in this prospectus supplement as a result of the unavailability of SOFR, or other applicable Benchmark Replacement, including as a result of any failure, inability, delay, error or inaccuracy on the part of any other transaction party in providing any direction, instruction, notice or information required or contemplated by the terms of this prospectus supplement and reasonably required for the performance of such duties. None of the Trustee or Calculation Agent shall be responsible or liable for our actions or omissions or for those of any of our designees, or for any failure or delay in the performance by us or any of our designees, nor shall any of the Trustee or Calculation Agent be under any obligation to oversee or monitor our performance or the performance of any of our designees. The Trustee may conclusively rely, without investigation, on the Calculation Agent’s determination of the interest rate during the floating rate periods.

Certain Defined Terms

As used herein:

“Benchmark” means, initially, Compounded SOFR, as such term is defined above; provided that if a Benchmark Transition Event and its related Benchmark Replacement Date have occurred with respect to

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Compounded SOFR (or the published SOFR Index used in the calculation thereof) or the then-current Benchmark, then “Benchmark” means the applicable Benchmark Replacement.

“Benchmark Replacement” means the first alternative set forth in the order below that can be determined by us or our designee as of the Benchmark Replacement Date; provided that if the Benchmark Replacement cannot be determined in accordance with clause (1) below as of the Benchmark Replacement Date and we or our designee shall have determined that the ISDA Fallback Rate determined in accordance with clause (2) below is not an industry-accepted rate of interest as a replacement for the then-current Benchmark for U.S. dollar-denominated floating rate notes at such time, then clause (2) below shall be disregarded, and the Benchmark Replacement shall be determined in accordance with clause (3) below:

(1) the sum of: (a) an alternate rate of interest that has been selected or recommended by the Relevant Governmental Body as the replacement for the then-current Benchmark and (b) the Benchmark Replacement Adjustment;

(2) the sum of: (a) the ISDA Fallback Rate and (b) the Benchmark Replacement Adjustment; or

(3) the sum of: (a) the alternate rate of interest that has been selected by us or our designee as the replacement for the then-current Benchmark giving due consideration to any industry-accepted rate of interest as a replacement for the then-current Benchmark for U.S. dollar-denominated floating rate notes at such time and (b) the Benchmark Replacement Adjustment.

“Benchmark Replacement Adjustment” means the first alternative set forth in the order below that can be determined by us or our designee as of the Benchmark Replacement Date:

(1) the spread adjustment (which may be a positive or negative value or zero), or method for calculating or determining such spread adjustment, that has been selected or recommended by the Relevant Governmental Body for the applicable Unadjusted Benchmark Replacement;

(2) if the applicable Unadjusted Benchmark Replacement is equivalent to the ISDA Fallback Rate, the ISDA Fallback Adjustment; or

(3) the spread adjustment (which may be a positive or negative value or zero) that has been selected by us or our designee giving due consideration to any industry-accepted spread adjustment, or method for calculating or determining such spread adjustment, for the replacement of the then-current Benchmark with the applicable Unadjusted Benchmark Replacement for U.S. dollar denominated floating rate notes at such time.

“Benchmark Replacement Conforming Changes” means, with respect to any Benchmark Replacement, any technical, administrative or operational changes (including changes to the definitions or interpretations of interest period, the timing and frequency of determining rates and making payments of interest, the rounding of amounts or tenors, and other administrative matters) that we or our designee decides may be appropriate to reflect the adoption of such Benchmark Replacement in a manner substantially consistent with market practice (or, if we or our designee decides that adoption of any portion of such market practice is not administratively feasible or if we or our designee determines that no market practice for use of the Benchmark Replacement exists, in such other manner as we or our designee determines is reasonably practicable).

“Benchmark Replacement Date” means the earliest to occur of the following events with respect to the then-current Benchmark (including any daily published component used in the calculation thereof):

(1) in the case of clause (1) or (2) of the definition of “Benchmark Transition Event,” the later of (a) the date of the public statement or publication of information referenced therein and (b) the date on which the

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administrator of the Benchmark permanently or indefinitely ceases to provide the Benchmark (or such component); or

(2) in the case of clause (3) of the definition of “Benchmark Transition Event,” the date of the public statement or publication of information referenced therein.

For the avoidance of doubt, if the event giving rise to the Benchmark Replacement Date occurs on the same day as, but earlier than, the Reference Time in respect of any determination, the Benchmark Replacement Date will be deemed to have occurred prior to the Reference Time for such determination.

“Benchmark Transition Event” means the occurrence of one or more of the following events with respect to the then-current Benchmark (including the daily published component used in the calculation thereof):

(1) a public statement or publication of information by or on behalf of the administrator of the Benchmark (or such component) announcing that such administrator has ceased or will cease to provide the Benchmark (or such component), permanently or indefinitely, provided that, at the time of such statement or publication, there is no successor administrator that will continue to provide the Benchmark (or such component);

(2) a public statement or publication of information by the regulatory supervisor for the administrator of the Benchmark (or such component), the central bank for the currency of the Benchmark (or such component), an insolvency official with jurisdiction over the administrator for the Benchmark (or such component), a resolution authority with jurisdiction over the administrator for the Benchmark (or such component) or a court or an entity with similar insolvency or resolution authority over the administrator for the Benchmark (or such component), which states that the administrator of the Benchmark (or such component) has ceased or will cease to provide the Benchmark (or such component) permanently or indefinitely, provided that, at the time of such statement or publication, there is no successor administrator that will continue to provide the Benchmark (or such component); or

(3) a public statement or publication of information by the regulatory supervisor for the administrator of the Benchmark announcing that the Benchmark is no longer representative.

“Calculation Agent” means the firm appointed by us prior to the commencement of the floating rate period. We or an affiliate of ours may assume the duties of the Calculation Agent.

“ISDA Definitions” means the 2021 ISDA Definitions published by ISDA, or any successor thereto, as amended or supplemented from time to time, or any successor definitional booklet for interest rate derivatives published from time to time.

“ISDA Fallback Adjustment” means the spread adjustment (which may be a positive or negative value or zero) that would apply for derivatives transactions referencing the ISDA Definitions to be determined upon the occurrence of an index cessation event with respect to the Benchmark for the applicable tenor.

“ISDA Fallback Rate” means the rate that would apply for derivatives transactions referencing the ISDA Definitions to be effective upon the occurrence of an index cessation date with respect to the Benchmark for the applicable tenor excluding the applicable ISDA Fallback Adjustment.

“Reference Time” with respect to any determination of the Benchmark means (1) if the Benchmark is Compounded SOFR, the SOFR Index Determination Time, as such time is defined above, and (2) if the Benchmark is not Compounded SOFR, the time determined by us or our designee in accordance with the Benchmark.

“Relevant Governmental Body” means the FRB and/or the FRBNY, or a committee officially endorsed or convened by the FRB and/or the FRBNY or any successor thereto.

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“Unadjusted Benchmark Replacement” means the Benchmark Replacement excluding the Benchmark Replacement Adjustment.

Optional Redemption

Prior to the Par Call Date, we may redeem the notes at our option, in whole or in part, at any time and from time to time, at a redemption price (expressed as a percentage of principal amount and rounded to three decimal places), equal to the greater of:

plus, in either case, accrued and unpaid interest thereon, if any, to, but excluding, the redemption date.

Additionally, we may redeem the notes at our option, in whole, but not in part, on the Par Call Date at a redemption price equal to 100% of the aggregate principal amount of the notes, plus accrued and unpaid interest thereon, if any, to but excluding, the redemption date. We may also redeem the notes at our option, in whole or in part, at any time and from time to time on or after     , 2030 (30 days prior to the maturity date) at a redemption price equal to 100% of the aggregate principal amount of the notes being redeemed, plus accrued and unpaid interest thereon, if any, to, but excluding, the redemption date.

“Treasury Rate” means, with respect to any redemption date, the yield determined by the Corporation in accordance with the following two paragraphs.

The Treasury Rate shall be determined by the Corporation after 4:15 p.m., New York City time (or after such time as yields on U.S. government securities are posted daily by the Board of Governors of the Federal Reserve System), on the third business day preceding the redemption date based upon the yield or yields for the most recent day that appear after such time on such day in the most recent statistical release published by the Board of Governors of the Federal Reserve System designated as “Selected Interest Rates (Daily)—H.15” (or any successor designation or publication) (“H.15”) under the caption “U.S. government securities-Treasury constant maturities-Nominal” (or any successor caption or heading) (“H.15 TCM”). In determining the Treasury Rate, the Corporation shall select, as applicable: (1) the yield for the Treasury constant maturity on H.15 exactly equal to the period from the redemption date to the Par Call Date (the “Remaining Life”); or (2) if there is no such Treasury constant maturity on H.15 exactly equal to the Remaining Life, the two yields—one yield corresponding to the Treasury constant maturity on H.15 immediately shorter than and one yield corresponding to the Treasury constant maturity on H.15 immediately longer than the Remaining Life—and shall interpolate to the Par Call Date on a straight-line basis (using the actual number of days) using such yields and rounding the result to three decimal places; or (3) if there is no such Treasury constant maturity on H.15 shorter than or longer than the Remaining Life, the yield for the single Treasury constant maturity on H.15 closest to the Remaining Life. For purposes of this paragraph, the applicable Treasury constant maturity or maturities on H.15 shall be deemed to have a maturity date equal to the relevant number of months or years, as applicable, of such Treasury constant maturity from the redemption date.

If on the third business day preceding the redemption date H.15 TCM is no longer published, the Corporation shall calculate the Treasury Rate based on the rate per annum equal to the semi-annual equivalent yield to maturity at 11:00 a.m., New York City time, on the second business day preceding such redemption date of the United States Treasury security maturing on, or with a maturity that is closest to, the Par Call Date, as applicable. If there is no United States Treasury security maturing on the Par Call Date but there are two or more

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United States Treasury securities with a maturity date equally distant from the Par Call Date, one with a maturity date preceding the Par Call Date and one with a maturity date following the Par Call Date, the Corporation shall select the United States Treasury security with a maturity date preceding the Par Call Date. If there are two or more United States Treasury securities maturing on the Par Call Date or two or more United States Treasury securities meeting the criteria of the preceding sentence, the Corporation shall select from among these two or more United States Treasury securities the United States Treasury security that is trading closest to par based upon the average of the bid and asked prices for such United States Treasury securities at 11:00 a.m., New York City time. In determining the Treasury Rate in accordance with the terms of this paragraph, the semi-annual yield to maturity of the applicable United States Treasury security shall be based upon the average of the bid and asked prices (expressed as a percentage of principal amount) at 11:00 a.m., New York City time, of such United States Treasury security, and rounded to three decimal places.

The Corporation’s actions and determinations in determining the redemption price shall be conclusive and binding for all purposes, absent manifest error. The Trustee shall not be responsible for calculating the redemption price or any component thereof or for verifying the Company’s calculations related to the redemption price or any component thereof.

Notice of any redemption will be mailed or electronically delivered (or otherwise transmitted in accordance with the depositary’s procedures) at least 10 days but not more than 60 days before the redemption date to each holder of notes to be redeemed. Any such notice of redemption may, at FNB’s discretion, be subject to one or more conditions precedent that must be satisfied prior to our obligation to redeem the notes subject to such notice of redemption, including, but not limited to, completion of an equity offering, refinancing or other corporation transaction.

In the case of a partial redemption, selection of the notes for redemption will be made pro rata, by lot or by such other method as the Trustee in its sole discretion deems appropriate and fair, and, for so long as the notes are held by DTC, in accordance with its applicable procedures. No notes of a principal amount of $1,000 or less will be redeemed in part. If any note is to be redeemed in part only, the notice of redemption that relates to the note will state the portion of the principal amount of the note to be redeemed. A new note in a principal amount equal to the unredeemed portion of the note will be issued in the name of the holder of the note upon surrender for cancellation of the original note. For so long as the notes are held by DTC (or another depositary), the redemption of the notes shall be done in accordance with the policies and procedures of the depositary.

Unless the Corporation defaults in payment of the redemption price, on and after the redemption date interest will cease to accrue on the notes or portions thereof called for redemption.

Ranking

The notes will be unsecured and unsubordinated and will rank equally in priority among themselves and with all of our other existing and future unsecured and unsubordinated indebtedness, and senior in right of payment to all of our existing and future subordinated indebtedness. The notes will be effectively subordinated to our existing and future secured indebtedness, to the extent of the value of the collateral securing such indebtedness, and structurally subordinated to the existing and future indebtedness of our subsidiaries. Because we are a holding company, our right to participate in any distribution of the assets of our banking or non-banking subsidiaries, upon a subsidiary’s dissolution, winding-up, liquidation or reorganization or otherwise, and thus the ability of a holder of notes to benefit indirectly from such distribution, is subject to prior claims of creditors of any such subsidiary, except to the extent that we may be a creditor of that subsidiary and our claims are recognized. Claims on our subsidiaries by creditors other than us may include claims with respect to long-term debt and substantial obligations with respect to deposit liabilities, federal funds purchased, securities sold under repurchase agreements, other short-term borrowings and various other financial obligations. There are legal limitations on the extent to which some of our subsidiaries, including FNBPA, may extend credit, pay dividends or otherwise supply funds to, or engage in transactions with, us or some of our other subsidiaries. Our

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subsidiaries are separate and distinct legal entities and have no obligation to pay any amounts due on the notes or to provide us with funds to pay our obligations on the notes, whether by dividends, distributions, loans or other payments. Our subsidiaries may, without notice or consent of the holders of the notes, incur additional debt and liabilities in the future, all of which would rank structurally senior to the notes. As of September 30, 2024, our subsidiaries’ total borrowings (including deposits) were approximately $40.8 billion (including FNB debt). All of such debt would rank structurally senior to the notes in case of liquidation or otherwise.

Consolidation, Merger, Conveyance or Transfer of Assets

We may consolidate with, or sell, lease or otherwise transfer all or substantially all of our assets to, or merge with or into, any other corporation, trust or other entity, provided that:

Upon any such consolidation, merger, or sale, the successor corporation formed, or into which we are merged or to which we are sold, shall succeed to, and be substituted for, us under the Indenture.

This covenant would not apply to any recapitalization transaction, change of control of us or a transaction in which we incur a large amount of additional debt unless the transactions or change of control included a merger or consolidation or transfer of all or substantially all of our assets. There are no covenants or other provisions in the Indenture providing for a put or increased interest or that would otherwise afford holders of the notes additional protection in the event of a recapitalization transaction, a change of control of us or a transaction in which we incur or acquire a large amount of additional debt.

Although there is a limited body of case law interpreting the phrase “substantially all,” there is no precise established definition of the phrase under applicable law. Accordingly, in certain circumstances there may be a degree of uncertainty as to whether a particular transaction would involve “all or substantially all” of the property or assets of a person.

Certain Covenants

Maintenance of Properties. We will cause all of our material properties used or useful in the conduct of our business or the business of any of our subsidiaries to be maintained and kept in good condition, repair, and working order and supplied with all necessary equipment and we will cause to be made all necessary repairs,

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renewals, replacements, betterments, and improvements for those properties, as we in our judgment believe is necessary so that we may carry on the business related to those properties properly and advantageously, although we will not be prevented from discontinuing the operation or maintenance of any of such properties if such discontinuance is, in our judgment, desirable in the conduct of our business or the business of any of our subsidiaries and not disadvantageous in any material respect to the holders of the notes.

Sale or Issuance of Capital Stock in Principal Subsidiary Bank. We will not be permitted, pursuant to the covenants in the Indenture, directly or indirectly, to do any of the following:

The term “principal subsidiary bank” means any subsidiary bank, the consolidated assets of which constitute 50% or more of our consolidated assets. As of the date of this prospectus supplement, our only principal subsidiary bank is FNBPA. The Indenture does not restrict the ability of the principal subsidiary bank to sell or dispose of assets.

The foregoing covenant in the Indenture, however, does not prohibit any of the following:

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Waiver of Certain Covenants. We may choose not to comply with any term, provision or condition of certain covenants contained in the Indenture, or with certain other terms, provisions or conditions with respect to the notes (except any such term, provision or condition which could not be amended without the consent of all holders of the notes), if before the time for compliance with the covenant, term, provision or condition, the holders of at least a majority in principal amount of the notes either waive compliance in that instance or generally waive compliance with that covenant, provision or condition. Until the waiver has become effective, our obligations in respect of the term, provision, or condition will remain in full force and effect.

Events of Default; Notice and Waiver

Each of the following “Events of Default” set forth in the Indenture will be applicable to the notes:

If there is a continuing Event of Default under the Indenture with respect to the notes, then the Trustee or the holders of not less than 25% of the total principal amount of the notes may declare immediately due and payable the principal amount of the notes.

If an Event of Default occurs as a result of our bankruptcy, insolvency or reorganization, the principal amount of the notes shall become immediately due and payable automatically, and without any declaration or other action on the part of the Trustee or any holder.

However, at any time after a declaration of acceleration with respect to the notes has been made, but before a judgment or decree for payment of the money due has been obtained by the Trustee, the holders of a majority in principal amount of the notes may rescind and annul such declaration and its consequences if:

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The Indenture also provides that the holders of not less than a majority in principal amount of the notes may waive any past default with respect to the notes and its consequences, except a default consisting of:

The Trustee is generally required to give notice to the holders of the notes of a default of which a responsible officer of the Trustee has actual knowledge under the Indenture unless the default has been cured or waived.

The Indenture provides that no holder of the notes may institute a proceeding with respect to the Indenture or for any remedy under the Indenture, unless such holder has previously given notice to the Trustee of an Event of Default and the Trustee fails to act for 60 days after:

The Trustee is not under an obligation to exercise any of its rights or powers under the Indenture at the request or direction of any holders of the notes, unless the holders of the notes have offered to the Trustee reasonable security or indemnity. Subject to these provisions for the indemnification of the Trustee, the holders of not less than a majority in principal amount of the notes will have the right to direct the time, method, and place of conducting any proceeding for any remedy available to the Trustee, or of exercising any trust or power conferred upon the Trustee. However, the Trustee may refuse to follow any direction which is in conflict with any law or the Indenture or which may involve the trustee in personal liability.

Within 120 days after the close of each fiscal year, we must deliver to the Trustee a certificate, signed by one of several specified officers, stating such officer’s knowledge of our compliance with all the conditions and covenants under the Indenture and, in the event of any non-compliance, specifying such non-compliance and the nature and status of the non-compliance.

Modification of the Indenture

Modification and amendment of the Indenture may be made only with the consent of the holders of not less than a majority in principal amount of the notes. However, no modification or amendment may, without the consent of each holder affected thereby, do any of the following:

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We and the Trustee may modify or amend the Indenture as applicable to the notes, without the consent of any holder of the notes, for any of the following purposes:

Discharge, Defeasance and Covenant Defeasance

Under the Indenture, we may discharge certain obligations to holders of the notes that have not already been delivered to the Trustee for cancellation and that either have become due and payable or will become due and payable within one year. We can discharge these obligations by irrevocably depositing with the Trustee funds in United States dollars in an amount sufficient to pay the entire indebtedness on the notes, including the principal of and interest payable on the notes to the date of the deposit, if the notes have become due and payable, or to the maturity date, if the notes have not yet become due and payable.

We may also elect either of the following:

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If we choose to defease and discharge our obligations under the covenants with respect to the notes, any failure to comply with the obligations imposed on us by the covenants will not constitute a default or an Event of Default with respect to the notes. However, to make either election, we must irrevocably deposit with the Trustee, in trust, an amount, in United States dollars, in United States government obligations or both, that will provide sufficient funds to pay the principal of and interest on the notes on the relevant scheduled due dates.

We may defease and discharge our obligations as described in the preceding paragraphs only if, among other things:

Same-Day Settlement and Payment

Initial settlement for the notes will be made in immediately available funds. Secondary market trading between DTC Participants will occur in the ordinary way in accordance with DTC rules and will be settled in immediately available funds using DTC’s Same-Day Funds Settlement System.

Trustee

Wilmington Trust, National Association will act as Trustee, registrar, and paying agent for the notes. From time to time, we and our subsidiaries may maintain deposit accounts and conduct other banking transactions, including lending transactions, with the Trustee in the ordinary course of business. Upon the occurrence of an Event of Default or a default under the notes, or upon the occurrence of a default under another indenture under which Wilmington Trust, National Association may serve as trustee in the future, the Trustee may be deemed to have a conflicting interest for purposes of the Trust Indenture Act and, accordingly, may be required to resign as Trustee under the Indenture. In that event, we would be required to appoint a successor trustee for the notes.

Except as otherwise provided in the Indenture, the Trustee will have all of the duties and responsibilities specified under the Trust Indenture Act.

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Calculation Agent

Unless we have redeemed, or called for redemption, all the outstanding notes on or prior to the commencement of the floating rate period, we will appoint a Calculation Agent for the notes prior to the floating rate period. We may appoint ourselves, an affiliate of ours or Wilmington Trust, National Association as Calculation Agent.

Notices

Any notices required to be given to the holders of the notes held in global form will be given to DTC.

Governing Law; Waiver of Jury Trial

The notes and the Indenture will be governed by the laws of the State of New York, but without giving effect to applicable principles of conflicts of law to the extent the application of the laws of another jurisdiction would be required thereby. The Indenture provides that we and the Trustee, and each holder of a note by its acceptance thereof, irrevocably waives, to the fullest extent permitted by applicable law, any and all right to trial by jury in any legal proceeding arising out of or relating to the Indenture or the notes, or any transaction contemplated thereby.

Book-Entry System

The notes will be issued as fully registered global notes which will be deposited with the Trustee, as custodian for DTC, in its corporate trust office, and registered, at the request of DTC, in the name of Cede & Co. Beneficial interests in the global notes will be represented through book-entry accounts of financial institutions acting on behalf of beneficial owners as participants in DTC. One or more fully registered certificates will be issued as global notes in the aggregate principal amounts of the applicable series of notes. Investors may elect to hold their interest in the global notes through DTC in the United States or, in Europe, through Euroclear or Clearstream. Beneficial interests in the global notes must be held in minimum denominations of $1,000 or any amount in excess thereof which is an integral multiple of $1,000. Except as set forth below, the global notes may be transferred, in whole and not in part, only to another nominee of DTC or to a successor of DTC or its nominee.

Owners of beneficial interests in a global note will not be entitled to have the notes represented by such global note registered in their names, will not receive or be entitled to receive physical delivery of such notes in definitive form, except as provided below, and will not be considered the owners or holders thereof under the Indenture. Accordingly, each person owning a beneficial interest in a global note must rely on the procedures of DTC for such global note and, if such person is not a participant in DTC (as described below), on the procedures of the participant through which such person owns its interest, to exercise any rights of a holder under the Indenture. References in this prospectus supplement to holders of the notes are to the registered holders and not to any owner of a beneficial interest in the notes. notes represented by a global note may be exchanged for definitive notes in registered form only if:

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In such circumstances, upon surrender by DTC or a successor depositary of the global notes, notes in definitive form will be issued to each person that DTC or a successor depositary identifies as the beneficial owner of the related notes. Upon issuance of notes in definitive form, the Trustee is required to register these notes in the name of, and cause the same to be delivered to, this person or these persons (or the nominee thereof). These notes would be issued in fully registered form without coupons, in minimum denominations of $1,000 or any amount in excess thereof which is an integral multiple of $1,000 and subsequently may not be exchanged by a holder for notes in denominations of less than $1,000.

We will make principal and interest payments on all notes represented by a global note to the Trustee which in turn will make payment to DTC or its nominee, as the case may be, as the sole registered owner of the notes represented by global notes. None of us, the Trustee or any underwriter will be responsible or liable for:

We and the Trustee understand that it is DTC’s current practice to credit participants’ accounts on each payment date with payments of principal or interest in amounts proportionate to their respective beneficial interests in the principal amount represented in the global notes as shown on DTC’s records, upon DTC’s receipt of funds and corresponding detail information. Payments by participants to owners of beneficial interests in a global note will be governed by standing instructions and customary practices, as is the case with securities held for customer accounts registered in a “street name,” and will be the sole responsibility of those participants.

The Clearing System

We have obtained the following information under this heading “The Clearing System” from sources that we believe to be reliable, but we take no responsibility for the accuracy of this information.

Owners of beneficial interests in a global note may elect to hold their interests in such global note outside the United States through Clearstream or Euroclear, if they are a participant of such system, or indirectly through organizations that are participants in such systems. Interests held through Clearstream and Euroclear will be recorded on DTC’s books as being held by the U.S. depositary for each of Clearstream and Euroclear, which U.S. depositaries will in turn hold interests on behalf of their participants’ customers’ securities accounts. Citibank, N.A. will act as depositary for Clearstream and JPMorgan Chase Bank, N.A. will act as depositary for Euroclear (in such capacities, the “U.S. Depositaries”).

DTC

DTC has advised us that it is a limited-purpose trust company organized under the New York Banking Law, a “banking organization” within the meaning of the New York Banking Law, a member of the Federal Reserve System, a “clearing corporation” within the meaning of the New York Uniform Commercial Code, and a “clearing agency” registered pursuant to the provisions of Section 17A of the Securities Exchange Act of 1934, as amended. DTC holds securities deposited with it by its participants and facilitates the settlement of transactions among its participants in such securities through electronic computerized book-entry changes in accounts of the participants, thereby eliminating the need for physical movement of securities certificates. DTC’s participants include securities brokers and dealers, banks, trust companies, clearing corporations and certain other organizations, some of whom (and/or their representatives) own DTC. Access to DTC’s book-entry system is also available to others, such as banks, brokers, dealers and trust companies that clear through or maintain a custodial relationship with a participant, either directly or indirectly. According to DTC, the foregoing

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information with respect to DTC has been provided to the financial community for informational purposes only and is not intended to serve as a representation, warranty or contract modification of any kind.

Clearstream

Clearstream advises that it is incorporated under the laws of Luxembourg as a professional depositary. Clearstream holds securities for its participating organizations (“Clearstream Participants”) and facilitates the clearance and settlement of securities transactions between Clearstream Participants through electronic book entry changes in accounts of Clearstream Participants, thereby eliminating the need for physical movement of certificates. Clearstream, provides to Clearstream Participants, among other things, services for safekeeping, administration, clearance and settlement of internationally traded securities and securities lending and borrowing. Clearstream interfaces with domestic markets in several countries. As a professional depositary, Clearstream is subject to regulation by the Luxembourg Commission for the Supervision of the Financial Sector (Commission de Surveillance du Secteur Financier). Clearstream Participants are recognized financial institutions around the world, including underwriters, securities brokers and dealers, banks, trust companies, clearing corporations and certain other organizations and may include the underwriters. Indirect access to Clearstream is also available to others, such as banks, brokers, dealers and trust companies that clear through or maintain a custodial relationship with a Clearstream Participant, either directly or indirectly.

Distributions with respect to interests in the notes held beneficially through Clearstream will be credited to cash accounts of Clearstream Participants in accordance with its rules and procedures, to the extent received by the U.S. Depositary for Clearstream.

Euroclear

Euroclear advises that it was created in 1968 to hold securities for participants of Euroclear (“Euroclear Participants”) and to clear and settle transactions between Euroclear Participants through simultaneous electronic book-entry delivery against payment, thereby eliminating the need for physical movement of certificates and any risk from lack of simultaneous transfers of securities and cash. Euroclear includes various other services, including securities lending and borrowing and interfaces with domestic markets in several countries. Euroclear is operated by Euroclear Bank S.A./N.V. (the “Euroclear Operator”). All operations are conducted by the Euroclear Operator, and all Euroclear securities clearance accounts and Euroclear cash accounts are accounts with the Euroclear Operator. Euroclear Participants include banks (including central banks), securities brokers and dealers and other professional financial intermediaries and may include the underwriters. Indirect access to Euroclear is also available to other firms that clear through or maintain a custodial relationship with a Euroclear Participant, either directly or indirectly.

The Terms and Conditions Governing Use of Euroclear and the related Operating Procedures of the Euroclear System, or the Euroclear Terms and Conditions, and applicable Belgian law govern securities clearance accounts and cash accounts with the Euroclear Operator.

Specifically, these terms and conditions govern:

All securities in Euroclear are held on a fungible basis without attribution of specific certificates to specific securities clearance accounts. The Euroclear Operator acts under the terms and conditions only on behalf of Euroclear Participants and has no record of or relationship with persons holding securities through Euroclear Participants.

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Distributions with respect to interests in the notes held beneficially through Euroclear will be credited to the cash accounts of Euroclear Participants in accordance with the Euroclear Terms and Conditions, to the extent received by the U.S. Depositary for the Euroclear Operator.

Settlement

Investors in the notes will be required to make their initial payment for the notes in immediately available funds. Secondary market trading between DTC participants will occur in the ordinary way in accordance with DTC rules and will be settled in immediately available funds. Secondary market trading between Clearstream Participants and/or Euroclear Participants will occur in the ordinary way in accordance with the applicable rules and operating procedures of Clearstream and Euroclear and will be settled using the procedures applicable to conventional eurobonds in immediately available funds.

Cross-market transfers between persons holding directly or indirectly through DTC, on the one hand, and directly or indirectly through Clearstream Participants or Euroclear Participants, on the other, will be effected in DTC in accordance with DTC rules on behalf of the relevant European international clearing system by the U.S. depositary for such clearing system; however, such cross-market transactions will require delivery of instructions to the relevant European international clearing system by the counterparty in such system in accordance with its rules and procedures and within its established deadlines (based on European time). The relevant European international clearing system will, if the transaction meets its settlement requirements, deliver instructions to the U.S. Depositary to take action to effect final settlement on its behalf by delivering or receiving notes in DTC, and making or receiving payment in accordance with normal procedures for same-day funds settlement applicable to DTC. Clearstream Participants and Euroclear Participants may not deliver instructions directly to their respective U.S. Depositaries.

Because of time-zone differences, credits of notes received in Clearstream or Euroclear as a result of a transaction with a DTC participant will be made during subsequent securities settlement processing and dated the business day following the DTC settlement date. Such credits or any transactions in such notes settled during such processing will be reported to the relevant Clearstream Participants or Euroclear Participants on such business day. Cash received in Clearstream or Euroclear as a result of sales of notes by or through a Clearstream Participant or a Euroclear Participant to a DTC participant will be received with value on the DTC settlement date but will be available in the relevant Clearstream or Euroclear cash account only as of the business day following settlement in DTC.

Although DTC, Clearstream and Euroclear have agreed to the foregoing procedures in order to facilitate transfers of notes among participants of DTC, Clearstream and Euroclear, they are under no obligation to perform or continue to perform such procedures and such procedures may be discontinued at any time. The information in this section concerning DTC, Clearstream, Euroclear and DTC’s book-entry system has been obtained from sources that we believe to be reliable (including DTC, Clearstream and Euroclear), but we take no responsibility for the accuracy thereof.

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MATERIAL U.S. FEDERAL INCOME TAX CONSEQUENCES

The following is a summary of material U.S. federal income tax consequences of the acquisition, ownership and disposition of the notes by U.S. Holders (as defined below) and Non-U.S. Holders (as defined below), but does not purport to be a complete analysis of all the potential tax consequences that may be relevant to a holder with respect to the acquisition, ownership and disposition of the notes. This summary is limited to the U.S. federal income tax consequences with respect to notes that were purchased by an initial holder at their original issue at the first price at which a substantial portion of the notes is sold for cash (other than to bond houses, brokers or similar persons or organizations acting in the capacity of underwriters, placement agents or wholesalers) and that are held as capital assets within the meaning of Section 1221 of the Code (generally, property held for investment). This summary does not address the U.S. federal income tax consequences to subsequent purchasers of the notes. This summary does not purport to deal with all aspects of U.S. federal income taxation that might be relevant to particular holders in light of their circumstances or status, nor does it address specific tax consequences that may be relevant to particular holders (including, for example, financial institutions, broker-dealers, thrifts, real estate investment trusts, regulated investments companies, traders in securities that elect mark-to-market treatment, insurance companies, individual retirement accounts or qualified pension plans or investors in pass-through entities, including partnerships and Subchapter S corporations, U.S. expatriates, tax-exempt organizations, U.S. Holders that have a functional currency other than the U.S. dollar, persons subject to special tax accounting rules as a result of any item of gross income with respect to the notes being taken into account in an applicable financial statement, or persons who hold notes as part of a straddle, hedge, conversion or other integrated financial transaction). In addition, this summary does not address all aspects of U.S. federal income taxes, such as consequences under the U.S. federal alternative minimum tax. Further, this summary does not address the consequences under any U.S. federal tax laws other than U.S. federal income tax laws, such as U.S. federal estate and gift tax laws, and does not address the consequences under the tax laws of any state, local or foreign jurisdiction.

This summary is based upon the Code, the Treasury Regulations (the “Regulations”) promulgated thereunder, and administrative and judicial interpretations thereof, all as of the date hereof and all of which are subject to change or differing interpretations, possibly on a retroactive basis. Any such change or differing interpretation could significantly affect the U.S. federal income tax considerations discussed below.

We have not sought, and will not seek, any ruling from the Internal Revenue Service (the “IRS”) with respect to the statements made and the conclusions reached in this summary, and we cannot assure you that the IRS will agree with such statements and conclusions.

THIS SUMMARY IS FOR GENERAL INFORMATION ONLY AND IS NOT INTENDED TO CONSTITUTE A COMPLETE DESCRIPTION OF ALL TAX CONSEQUENCES FOR HOLDERS RELATING TO THE ACQUISITION, OWNERSHIP AND DISPOSITION OF OUR NOTES. PROSPECTIVE PURCHASERS OF THE NOTES ARE URGED TO CONSULT THEIR OWN TAX ADVISORS CONCERNING THE U.S. FEDERAL INCOME TAXATION AND OTHER TAX CONSEQUENCES TO THEM OF ACQUIRING, OWNING AND DISPOSING OF THE NOTES, AS WELL AS THE APPLICATION OF STATE, LOCAL AND FOREIGN INCOME AND OTHER TAX LAWS.

For purposes of the following summary, a “U.S. Holder” is a beneficial owner of notes that is, for U.S. federal income tax purposes:

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A “Non-U.S. Holder” is a beneficial owner of notes that is neither a U.S. Holder nor an entity or an arrangement treated as a partnership (or other pass-through entity) for U.S. federal income tax purposes.

If an entity or an arrangement treated as a partnership for U.S. federal income tax purposes holds notes, the tax treatment of a partner in the partnership will generally depend upon the status of the partner and the activities of the partnership. Partnerships acquiring notes, and partners in such partnerships, should consult their own tax advisors.

U.S. Federal Income Taxation of U.S. Holders

Variable Rate Debt Instruments. The notes will initially bear interest at a fixed annual rate. During the floating rate period, starting from and including the interest reset date to but excluding the redemption date or the maturity date, the notes will bear interest at a rate equal to Compounded SOFR applicable to the relevant interest period plus  %. Under applicable Treasury Regulations, a note will generally qualify as a “variable rate debt instrument” (“VRDI”) if all of the following four conditions are met:

A variable rate of interest generally is a “qualified floating rate” if variations in the rate’s value can reasonably be expected to measure contemporaneous variations in the cost of newly borrowed funds in the currency in which the debt instrument is denominated. We believe, and this summary assumes, that compounded SOFR (or the applicable benchmark replacement rate) plus a fixed spread meets (or will meet) the qualifications for being a qualified floating rate.

The “current value” of a qualified floating rate is the value of the rate on any day that is no earlier than three months prior to the first day on which that value is in effect and no later than one year following that first day.

The notes provide for stated interest that is unconditionally payable in cash at least annually at a single fixed rate and a rate that qualifies as a qualified floating rate. In addition, the notes are each expected to satisfy the other conditions described above to qualify as VRDIs. Therefore, each note is expected to constitute a VRDI, and this summary assumes that each such note will be so treated.

Under the U.S. federal income tax rules applicable to VRDIs and based on current market conditions, as of the issue date of the notes, we expect all interest on the notes will be treated as “qualified stated interest” and the notes will not be treated as having been issued with original issue discount. This summary assumes such treatment is correct.

Pursuant to the foregoing rules, a U.S. Holder generally will be taxable on interest actually paid or accrued on the notes as discussed below under “—Payments of Interest.”

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Payment of Interest. Stated interest on your notes will be taxed as ordinary interest income. If you use the cash method of accounting for U.S. federal income tax purposes, you will have to include the interest on your notes in your gross income at the time you receive the interest. If you use the accrual method of accounting for U.S. federal income tax purposes, you will have to include the interest on your notes in your gross income at the time the interest accrues.

Disposition of the notes. Upon the redemption, sale or other taxable disposition of a note, a U.S. Holder generally will recognize taxable gain or loss equal to the difference between (i) the sum of all cash plus the fair market value of all other property received on such disposition (except to the extent such cash or other property is attributable to accrued but unpaid interest which has not previously been included in income, which amount will be taxable as ordinary income) and (ii) such U.S. Holder’s adjusted tax basis in the note. A U.S. Holder’s adjusted tax basis in a note generally will equal the cost of the note to such U.S. Holder. Any gain or loss recognized on the disposition of a note generally will be capital gain or loss, and will be long-term capital gain or loss if, at the time of such disposition, the U.S. Holder’s holding period for the note is more than one year. Long-term capital gain recognized by a non-corporate U.S. Holder (such as an individual) generally is subject to tax at a lower rate than short-term capital gain or ordinary income. The deductibility of capital losses is subject to significant limitations.

Backup Withholding and Information Reporting. U.S. Holders of notes, except for certain exempt recipients, will generally be subject to information reporting and backup withholding (currently at a rate of 24%) on payments of interest, principal and gross proceeds from a disposition of notes. However, backup withholding generally applies only if the U.S. Holder:

Backup withholding is not an additional tax. Any amount withheld from a payment to a U.S. Holder under the backup withholding rules is allowable as a credit against such U.S. Holder’s U.S. federal income tax liability and may entitle such holder to a refund, provided such holder timely furnishes the required information to the IRS. Prospective purchasers should consult their own tax advisors as to their qualification for an exemption from backup withholding and the procedure for obtaining an exemption. We cannot refund amounts once withheld.

We will furnish annually to the IRS, and to record holders of the notes to whom we are required to furnish such information, information relating to the amount of interest paid and the amount of backup withholding, if any, with respect to payments on the notes.

Net Investment Income Tax. A tax of 3.8% (the “Net Investment Income Tax”) is imposed on the “net investment income” of certain U.S. citizens and resident aliens, and on the undistributed “net investment income” of certain trusts and estates. Among other items, “net investment income” generally includes gross income from interest and net gain from the disposition of certain property, including notes, less certain related deductions.

Prospective purchasers of the notes should consult an independent tax advisor regarding the possible implications of the Net Investment Income Tax on their particular circumstances.

U.S. Federal Income Taxation of Non-U.S. Holders

Payment of Interest. Subject to the summary of backup withholding and FATCA below, payments of stated interest on a note to any Non-U.S. Holder generally will not be subject to U.S. federal income or withholding tax

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provided we or the person otherwise responsible for withholding U.S. federal income tax from payments on the notes receives a required certification from the Non-U.S. Holder and the holder is not:

In order to satisfy the certification requirement, the Non-U.S. Holder must provide a properly completed IRS Form W-8BEN or Form W-8BEN-E, as appropriate (or substitute Form W-8BEN or Form W-8BEN-E or the appropriate successor form of either), under penalties of perjury that provides the Non-U.S. Holder’s name and address and certifies that the Non-U.S. Holder is not a U.S. person. Alternatively, in the case where a security clearing organization, bank, or other financial institution holds the notes in the ordinary course of its trade or business on behalf of the Non-U.S. Holder, certification requires that we or the person who otherwise would be required to withhold U.S. federal income tax receive from the financial institution a certification under penalties of perjury that a properly completed Form W-8BEN or Form W-8BEN-E, as appropriate (or substitute Form W-8BEN or Form W-8BEN-E or the appropriate successor form for either), has been received by it from the Non-U.S. Holder, and a copy of such form is furnished to us or the person who otherwise would be required to withhold U.S. federal income tax.

A Non-U.S. Holder that does not qualify for exemption from withholding under the preceding paragraphs generally will be subject to withholding of U.S. federal income tax, currently at the rate of 30%, or a lower applicable treaty rate, on payments of interest on the notes that are not effectively connected with the conduct by the Non-U.S. Holder of a trade or business in the United States.

If the payments of interest on a note are effectively connected with the conduct by a Non-U.S. Holder of a trade or business in the United States (and, if an income tax treaty applies, are attributable to a permanent establishment or a fixed base maintained by the Non-U.S. Holder in the United States), such payments will be subject to U.S. federal income tax on a net basis at the rates applicable to U.S. persons generally. If the Non-U.S. Holder is a corporation for U.S. federal income tax purposes, such payments also may be subject to a branch profits tax imposed at 30% or a lower applicable treaty rate. If payments are subject to U.S. federal income tax on a net basis in accordance with the rules described in the preceding two sentences, such payments will not be subject to U.S. withholding tax so long as the holder provides us, or the person who otherwise would be required to withhold U.S. federal income tax, with the appropriate certification.

In order to claim a tax treaty benefit or exemption from withholding with respect to income that is effectively connected with the conduct of a trade or business in the United States by a Non-U.S. Holder, the Non-U.S. Holder must provide a properly executed Form W-8BEN, Form W-8BEN-E or Form W-8ECI (or a suitable substitute or successor form or such other form as the IRS may prescribe). Under the Regulations, a Non-U.S. Holder may under certain circumstances be required to obtain a U.S. taxpayer identification number and make certain certifications to us.

Non-U.S. Holders should consult their tax advisors regarding any applicable income tax treaties, which may provide for a lower rate of withholding tax, exemption from or reduction of branch profits tax or other rules different from those described above.

Disposition of the notes. Subject to the discussion of backup withholding below, a Non-U.S. Holder will generally not be subject to U.S. federal income tax or withholding tax on any gain or income realized by a Non-U.S. Holder upon the sale, redemption or other taxable disposition of a note (except with respect to accrued

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but unpaid interest, which will be treated as described above under “—U.S. Federal Income Taxation of Non-U.S. Holders—Payment of Interest”) unless:

A Non-U.S. Holder described in the first bullet point above will generally be taxed as if such Holder was a U.S. Holder (see “Tax Consequences to U.S. Holders” above). In addition, a foreign corporation described in the first bullet point may be subject to the 30% branch profits tax (or lower rate under an applicable income tax treaty) on its effectively connected earnings and profits, subject to adjustments. Non-U.S. Holders described in the first bullet point above should consult their tax advisors with respect to the U.S. tax consequences of the ownership and disposition of the notes, including the possible imposition of the branch profits tax.

The gain on the sale, redemption, or other taxable disposition of the note (which gain may be offset by certain U.S.-source losses) of an individual Non-U.S. Holder described in the second bullet point above generally will be subject to a 30% tax, unless an applicable income tax treaty provides otherwise. Such an individual should consult with a tax advisor regarding the U.S. federal income tax consequences of the sale, exchange, redemption, retirement or other taxable disposition of the notes.

Proceeds from the disposition of a note that are attributable to accrued but unpaid interest generally will be subject to, or exempt from, tax to the same extent as described above with respect to payments of interest.

Backup Withholding and Information Reporting. U.S. backup withholding tax will not apply to payments of interest on a note or proceeds from the sale or other disposition of a note payable to a Non-U.S. Holder if the certification described in “—U.S. Federal Income Taxation of Non-U.S. Holders—Payment of Interest” is duly provided by such Non-U.S. Holder or the Non-U.S. Holder otherwise establishes an exemption, provided that the payor does not have actual knowledge or reason to know that the holder is a U.S. person or that the conditions of any claimed exemption are not satisfied. Certain information reporting may still apply to interest payments even if an exemption from backup withholding is established. Copies of any information returns reporting interest payments and any withholding may also be made available to the tax authorities in the country in which a Non-U.S. Holder resides under the provisions of an applicable income tax treaty.

Backup withholding is not an additional tax. Any amounts withheld under the backup withholding tax rules from a payment to a Non-U.S. Holder will be allowed as a refund or a credit against such Non-U.S. Holder’s U.S. federal income tax liability, provided that the requisite procedures are followed.

Non-U.S. Holders should consult their own tax advisors regarding their particular circumstances and the availability of and procedure for establishing an exemption from backup withholding.

FATCA. The Foreign Account Tax Compliance Act and the Regulations promulgated thereunder (“FATCA”) impose a U.S. federal withholding tax at a rate of 30% on interest payments of interest-bearing obligations, including the notes, paid to certain non-U.S. financial institutions and certain other non-U.S. entities if certain certification, information reporting and other specified requirements are not satisfied. An intergovernmental agreement between the United States and an applicable non-US country may modify such requirements. While withholding under FATCA would have applied also to payments of gross proceeds from the taxable disposition (including a retirement or redemption) of a note, proposed Regulations eliminate FATCA withholding on payments of gross proceeds entirely. Taxpayers generally may rely on these proposed Regulations until final Regulations are issued.

Prospective investors are encouraged to consult their tax advisors regarding the implications of FATCA on their investment in the notes.

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CERTAIN CONSIDERATIONS APPLICABLE TO ERISA, GOVERNMENTAL AND OTHER PLAN INVESTORS

The following is a summary of certain considerations associated with the purchase of the notes by (i) employee benefit plans subject to Title I of ERISA, (ii) plans, individual retirement accounts and other arrangements subject to Section 4975 of the Code, (iii) other plans including governmental plans, non-U.S. plans and certain church plans, that are subject to federal, state, local, non-U.S. or other laws or regulations that are similar to ERISA or Section 4975 of the Code (collectively, “Similar Laws”), and (iv) entities whose underlying assets are considered to include “plan assets” (as defined in U.S. Department of Labor regulation C.F.R. Section 2510.3-101, as modified by Section 3(42) of ERISA) of such employee benefit plans, plans, accounts or arrangements. Each of these plans, entities, individual retirement accounts and arrangements are referred to in this summary as a “plan.” This summary is general in nature and does not address every issue pertaining to ERISA, the Code or any Similar Law that may be applicable to us, the notes or a particular investor. Accordingly, each prospective investor should consult with his, her or its own counsel in order to understand the ERISA-related issues that affect or may affect the investor with respect to this investment. Each fiduciary of a plan should consider the applicable provisions of ERISA, the Code and any Similar Laws in the context of the plan’s particular circumstances before authorizing an investment in the notes. Accordingly, among other factors, the fiduciary should consider whether the investment would satisfy the prudence and diversification requirements of ERISA or any applicable Similar Laws and would be consistent with the documents and instruments governing the plan.

Section 406 of ERISA and Section 4975 of the Code prohibit plans subject to such provisions from engaging in certain transactions involving “plan assets” with persons that are “parties in interest” under ERISA or “disqualified persons” under Section 4975 of the Code with respect to the plans, unless an exemption is available. A violation of these “prohibited transaction” rules may result in an excise tax or other penalties and liabilities under ERISA and the Code for those persons, unless exemptive relief is available under an applicable statutory or administrative exemption.

Prohibited transactions within the meaning of Section 406 of ERISA or Section 4975 of the Code could arise if the notes were acquired by a plan with respect to which we or any of our affiliates or any underwriter is a party in interest or a disqualified person. For example, if we or any underwriter is party in interest or disqualified person with respect to an investing plan (either directly or, in our case, by reason of our ownership of our subsidiaries), the purchase of any notes by a plan could result in a sale or exchange prohibited by Section 406(a)(1)(A) of ERISA and Section 4975(c)(1)(A) of the Code and/or an extension of credit prohibited by Section 406(a)(1)(B) of ERISA and Section 4975(c)(1)(B) of the Code, unless exemptive relief were available under an applicable exemption (see below).

The U.S. Department of Labor has issued prohibited transaction class exemptions (“PTCEs”), that may provide exemptive relief for direct or indirect prohibited transactions resulting from the purchase, holding or disposition of the notes. Those class exemptions (each, as amended) include:

In addition, ERISA Section 408(b)(17) and Section 4975(d)(20) of the Code provides an exemption for transactions between a plan and a party in interest or disqualified person, provided that the party in interest or disqualified person is not a fiduciary (or an affiliate) who has or exercises any discretionary authority or control

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with respect to the investment of the plan assets involved in the transaction or renders investment advice with respect to those assets, and is a party in interest or disqualified person solely by reason of being a service provider to the plan, being a relative of the service provider or having certain other employment or ownership relationships to a service provider to the plan and provided, further that the plan receives no less, nor pays more, than adequate consideration in connection with the transaction. No assurance can be made that all of the conditions of any of these or any other exemptions will be satisfied.

Because of the possibility that direct or indirect prohibited transactions or violations of Similar Laws could occur as a result of the purchase, holding or disposition of the notes by a plan, the notes may not be purchased by any plan, or any person investing the assets of any plan, unless its purchase, holding and disposition of the notes will not constitute or result in a non-exempt prohibited transaction under ERISA or Section 4975 of the Code or a violation of any Similar Laws. Any purchaser or holder of the notes or any interest in the notes shall be deemed, on behalf of itself and the plan, by purchasing and holding the notes, or exercising any rights related thereto, to represent that to have represented by its purchase and holding of the notes that: (a) the plan will receive no less and pay no more than “adequate consideration” (within the meaning of Section 408(b)(17) of ERISA and Section 4975(f)(10) of the Code) in connection with the purchase and holding of the notes, (b) none of the purchase, holding or disposition of the notes or the exercise of any rights related to the notes will result in a non-exempt prohibited transaction under ERISA or the Code (or, with respect to a governmental plan, under any similar applicable law), and (c) neither FNB nor any of its affiliates is a “fiduciary” (within the meaning of Section 3(21) of ERISA) or, with respect to a governmental plan, under any similar applicable law or regulation) with respect to the purchaser or holder in connection with such person’s acquisition, disposition or holding of the notes, or as a result of any exercise by FNB or any of its affiliates of any rights in connection with the notes, and neither FNB nor any of its affiliates has provided investment advice in connection with such person’s acquisition, disposition or holding of the notes.

Due to the complexity of these rules and the penalties imposed upon persons involved in non-exempt prohibited transactions, it is important that any person considering the purchase of the notes on behalf of or with the assets of any plan consult with its counsel regarding the consequences under ERISA, Section 4975 of the Code and any applicable Similar Laws of the acquisition, ownership and disposition of the notes, whether any exemption would be applicable, and whether all conditions of such exemption have been satisfied such that the acquisition and holding of the notes by, or on behalf of, the plan are entitled to full exemptive relief thereunder. Nothing herein shall be construed as, and the sale of the notes to a plan is in no respect, a representation by us or the underwriter that any investment in the notes would meet any or all of the relevant legal requirements with respect to investment by, or is appropriate for, plans generally or any particular plan.

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UNDERWRITING

Under the terms and subject to the conditions contained in an underwriting agreement, dated December    , 2024 (the “underwriting agreement”), the underwriters named below (the “underwriters”), for whom Morgan Stanley & Co. LLC and BofA Securities, Inc. are acting as representatives (the “representatives”), have severally agreed to purchase, and we have agreed to sell to them, severally, the respective principal amount of the notes set forth opposite their names below:

The underwriting agreement provides that the underwriters are obligated, severally and not jointly, to purchase all of the notes if any are purchased.

The underwriters propose to offer the notes directly to the public at the public offering price on the cover page of this prospectus supplement and may offer the notes to certain dealers at the public offering price less concession not to exceed  % of the principal amount of the notes. The underwriters may allow, and dealers may reallow, a concession not to exceed  % of the principal amount of the notes on sales to other dealers. After the initial offering of the notes, the price to public and other selling terms may from time to time be varied by the underwriters. The offering of the notes by the underwriters is subject to receipt and acceptance and subject to the underwriters’ right to reject any order in whole or in part.

The underwriting fee is equal to the public offering price per note less the amount paid by the underwriters to us per note. The following table shows the per-note and total underwriting discounts and commissions to be paid to the underwriters.

The aggregate proceeds to us are set forth on the cover page of this prospectus supplement before deducting our expenses in offering the notes. We estimate that we will pay approximately $     for expenses, excluding underwriting discounts, allocable to the offering. These expenses include the underwriters’ legal fees in connection with this offering that we have agreed to pay.

We have agreed to indemnify the several underwriters against certain liabilities, including liabilities under the Securities Act of 1933, as amended, or to contribute to payments that the underwriters may be required to make in respect thereof.

The notes are a new issue of securities with no established trading market. We do not intend to apply for listing of the notes on any national securities exchange or for inclusion of the notes on any automated dealer quotation system. Although one or more underwriters intend to make a secondary market for the notes, they are not obligated to do so and may discontinue making a secondary market for the notes at any time without notice. No assurance can be given as to how liquid the trading market for the notes will be.

In connection with the offering, the underwriters may engage in transactions that stabilize the market price of the notes. Such transactions consist of bids or purchases to peg, fix or maintain the price of the notes. If the underwriters create a short position in the notes in connection with the offering, i.e., if they sell more notes than are listed on the cover page of this prospectus supplement, the underwriters may reduce that short position by purchasing notes in the open market. Purchases of a security to stabilize the price or to reduce a short position may cause the price of the notes to be higher than they might be in the absence of these purchases.

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The underwriters also may impose a penalty bid. This occurs when a particular underwriter repays to the underwriters a portion of the underwriting discount received by it because the representatives have repurchased notes sold by or for the account of such underwriter in stabilizing or short covering transactions.

Neither we nor the underwriters make any representation or prediction as to the direction or magnitude of any effect that the transactions described above may have on the price of the notes. In addition, neither we nor the underwriters make any representation that the underwriters will engage in these transactions or that these transactions, once commenced, will not be discontinued without notice.

The underwriters and their respective affiliates are full service financial institutions engaged in various activities, which may include securities trading, commercial and investment banking, financial advisory, investment management, investment research, principal investment, hedging, market making, brokerage and other financing and non-financial activities and services. Some of the underwriters and their affiliates have engaged in, and may in the future engage in, investment banking and other commercial dealings in the ordinary course of business with us or our affiliates. They have received or may in the future receive customary fees and commissions for these transactions.

In addition, in the ordinary course of their business activities, the underwriters and their affiliates may make or hold a broad array of investments, including serving as counterparties to certain derivative and hedging arrangements, and may actively trade debt and equity securities (or related derivative securities) and financial instruments (including bank loans) for their own account and for the accounts of their customers. Such investments and securities activities may involve securities and/or instruments of ours or our affiliates. Certain of the underwriters or their affiliates that have a lending relationship with us routinely hedge their credit exposure to us consistent with their customary risk management policies. Typically, such underwriters and their affiliates would hedge such exposure by entering into transactions which consist of either the purchase of credit default swaps or the creation of short positions in our securities, including potentially the notes offered hereby. Any such credit default swaps or short positions could adversely affect future trading prices of the notes offered hereby. The underwriters and their affiliates may also make investment recommendations and/or publish or express independent research views in respect of such securities or financial instruments and may hold, or recommend to clients that they acquire, long and/or short positions in such securities and instruments.

Conflicts of Interest

Some of the underwriters and their affiliates have engaged in, and may in the future engage in, investment banking and other commercial dealings in the ordinary course of business with us or our affiliates. They have received, or may in the future receive, customary fees and commissions for these transactions.

In addition, in the ordinary course of their business activities, the underwriters and their affiliates may make or hold a broad array of investments and actively trade debt and equity securities (or related derivative securities) and financial instruments (including bank loans) for their own account and for the accounts of their customers. Such investments and securities activities may involve securities and/or instruments of ours or our affiliates. The underwriters and their affiliates may also make investment recommendations and/or publish or express independent research views in respect of such securities or financial instruments and may hold, or recommend to clients that they acquire, long and/or short positions in such securities and instruments.

Alternative Settlement Cycle

It is expected that delivery of the notes will be made against payment therefor on or about December  , 2024, which is the   business day following the date hereof (such settlement cycle being referred to as “T+  ”). Pursuant to Rule 15c6-1(a) under the Exchange Act, trades in the secondary market generally are required to settle in one business day unless the parties to any such trade expressly agree otherwise. Accordingly, purchasers who wish to trade the notes more than one business day prior to the settlement date will be required, by virtue of

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the fact that the notes initially will settle in T+  , to specify an alternative settlement cycle at the time of any such trade to prevent failed settlement. Purchasers of the notes who wish to trade such notes more than one business day prior to the settlement date should consult their own advisors.

Selling Restrictions

European Economic Area

The notes are not intended to be offered, sold or otherwise made available to and should not be offered, sold or otherwise made available to any retail investor in the European Economic Area (the “EEA”). For these

purposes, a retail investor means a person who is one (or more) of: (i) a retail client as defined in point (11) of Article 4(1) of Directive 2014/65/EU (as amended, “MiFID II”); (ii) a customer within the meaning of Directive 2016/97/EU (as amended), where that customer would not qualify as a professional client as defined in point (10) of Article 4(1) of MiFID II; or (iii) not a qualified investor as defined in Regulation 2017/1129 (EU) (as amended or superseded, the “Prospectus Regulation”).

Consequently, no key information document required by Regulation (EU) No 1286/2014 (as amended, the “PRIIPs Regulation”) for offering or selling the notes or otherwise making them available to retail investors in the EEA has been prepared and therefore offering or selling the notes or otherwise making them available to any retail investor in the EEA may be unlawful under the PRIIPs Regulation.

This prospectus supplement and the accompanying prospectus have been prepared on the basis that any offer of notes in any member state of the EEA will be made pursuant to an exemption under the Prospectus Regulation from the requirement to publish a prospectus for offers of securities. This prospectus supplement and the accompanying prospectus are not a prospectus for the purposes of the Prospectus Regulation.

United Kingdom

The notes are not intended to be offered, sold or otherwise made available to and should not be offered, sold or otherwise made available to any retail investor in the UK. For these purposes, a retail investor means a person who is one (or more) of: (i) a retail client, as defined in point (8) of Article 2 of Regulation (EU) No 2017/565 as it forms part of domestic law of the UK by virtue of the European Union (Withdrawal) Act 2018; or (ii) a customer within the meaning of the provisions of the Financial Services and Markets Act 2000 (the “FSMA”) and any rules or regulations made under the FSMA which were relied on immediately before exit day to implement Directive (EU) 2016/97, where that customer would not qualify as a professional client, as defined in point (8) of Article 2(1) of Regulation (EU) No 600/2014 as it forms part of domestic law of the UK by virtue of the European Union (Withdrawal) Act 2018. Consequently no key information document required by Regulation (EU) No 1286/2014 as it forms part of domestic law of the UK by virtue of the European Union (Withdrawal) Act 2018 (the “UK PRIIPs Regulation”) for offering or selling the notes or otherwise making them available to retail investors in the UK has been prepared and therefore offering or selling the notes or otherwise making them available to any retail investor in the UK may be unlawful under the UK PRIIPs Regulation.

Canada

The notes may be sold only to purchasers purchasing, or deemed to be purchasing, as principal that are accredited investors, as defined in National Instrument 45-106 Prospectus Exemptions or subsection 73.3(1) of the Securities Act (Ontario), and are permitted clients, as defined in National Instrument 31-103 Registration Requirements, Exemptions and Ongoing Registrant Obligations. Any resale of the notes must be made in accordance with an exemption from, or in a transaction not subject to, the prospectus requirements of applicable securities laws.

Securities legislation in certain provinces or territories of Canada may provide a purchaser with remedies for rescission or damages if this prospectus supplement (including any amendment thereto) contains a misrepresentation, provided that the remedies for rescission or damages are exercised by the purchaser within the

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time limit prescribed by the securities legislation of the purchaser’s province or territory. The purchaser should refer to any applicable provisions of the securities legislation of the purchaser’s province or territory for particulars of these rights or consult with a legal advisor.

Pursuant to section 3A.3 (or, in the case of securities issued or guaranteed by the government of a non-Canadian jurisdiction, section 3A.4) of National Instrument 33-105 Underwriting Conflicts (NI 33-105), the underwriters are not required to comply with the disclosure requirements of NI 33-105 regarding underwriter conflicts of interest in connection with this offering.

Hong Kong

The notes may not be offered or sold in Hong Kong by means of any document other than (i) in circumstances which do not constitute an offer to member of the public within the meaning of the Companies (Winding Up and Miscellaneous Provisions) Ordinance (Cap. 32 of the Laws of Hong Kong) (“Companies (Winding Up and Miscellaneous Provisions) Ordinance”) or which do not constitute an invitation to members of the public within the meaning of the Securities and Futures Ordinance (Cap. 571 of the Laws of Hong Kong) (“Securities and Futures Ordinance”), or (ii) to “professional investors” as defined in the Securities and Futures Ordinance and any rules made thereunder, or (iii) in other circumstances which do not result in the document being a “prospectus” as defined in the Companies (Winding Up and Miscellaneous Provisions) Ordinance, and no advertisement, invitation or document relating to the notes may be issued or may be in the possession of any person for the purpose of issue (in each case whether in Hong Kong or elsewhere), which is directed at, or the contents of which are likely to be accessed or read by, any member of the public in Hong Kong (other than “professional investors” in Hong Kong as defined in the Securities and Futures Ordinance and any rules made thereunder.

Singapore

This prospectus supplement has not been registered as a prospectus with the Monetary Authority of Singapore. Accordingly, the notes were not offered or sold or caused to be made the subject of an invitation for subscription or purchase and will not be offered or sold or caused to be made the subject of an invitation for subscription or purchase, and this prospectus supplement or any other document or material in connection with the offer or sale, or invitation for subscription or purchase, of the notes, has not been circulated or distributed, nor will it be circulated or distributed, whether directly or indirectly, to any person in Singapore other than (i) to an institutional investor (as defined in Section 4A of the Securities and Futures Act (Chapter 289) of Singapore, as modified or amended from time to time (the “SFA”)) pursuant to Section 274 of the SFA, (ii) to a relevant person (as defined in Section 275(2) of the SFA) pursuant to Section 275(1) of the SFA, or any person pursuant to Section 275(1A) of the SFA, and in accordance with the conditions specified in Section 275 of the SFA, or (iii) otherwise pursuant to, and in accordance with the conditions of, any other applicable provision of the SFA.

Where the notes are subscribed or purchased under Section 275 of the SFA by a relevant person which is:

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Japan

The notes have not been and will not be registered under the Financial Instruments and Exchange Act of Japan (Act No. 25 of 1948, as amended) (the “FIEA”). Neither the notes nor any interest therein may not be offered or sold, directly or indirectly, in Japan or to or for the benefit of any resident of Japan, having a principal office in Japan, or any Japanese office of any corporation or other entity organized outside of Japan (including any person resident in Japan or any corporation or other entity organized under the laws of Japan) or to others for reoffering or resale, directly or indirectly, in Japan or to or for the benefit of any resident of Japan, except pursuant to an exemption from the registration requirements of the FIEA and otherwise in compliance with any relevant laws and regulations of Japan.

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LEGAL MATTERS

Certain legal matters relating to the notes offered by this prospectus supplement will be passed upon for us by Reed Smith LLP, Pittsburgh, Pennsylvania and New York, New York. The underwriters have been represented in connection with this offering by Squire Patton Boggs (US) LLP, New York, New York.

EXPERTS

The consolidated financial statements of FNB appearing in our Annual Report on Form 10-K for the year ended December 31, 2023, and the effectiveness of FNB’s internal control over financial reporting as of December 31, 2023, have been audited by Ernst & Young LLP, independent registered public accounting firm, as set forth in their reports thereon, included therein and incorporated herein by reference. Such consolidated financial statements are incorporated herein by reference in reliance upon such reports given on the authority of such firm as experts in accounting and auditing.

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Common Stock

Preferred Stock

Debt Securities

Depositary Shares

Warrants

Purchase Contracts

Units

The securities listed above may be offered and sold by us and/or may be offered and sold, from time to time, by one or more selling security holders to be identified in the future. The specific terms of any securities to be offered, and the specific manner in which they may be offered, will be described in a supplement to this prospectus. You should read this prospectus and the applicable prospectus supplement carefully before you invest in the securities described in the applicable prospectus supplement. This prospectus may not be used to sell securities unless accompanied by the applicable prospectus supplement.

Our common stock is listed on the New York Stock Exchange and trades under the ticker symbol “FNB”.

Neither the Securities Exchange Commission nor any state securities commission has approved or disapproved of these securities or determined if this prospectus is truthful or complete. Any representation to the contrary is a criminal offense.

We may offer and sell these securities to or through one or more underwriters, dealers and agents, or directly to purchasers, on a continuous or delayed basis.

These securities will be our equity securities or our unsecured obligations and will not be savings accounts, deposits or other obligations of any banking or non-banking subsidiary of ours and are not insured by the Federal Deposit Insurance Corporation or any other governmental agency.

Investing in our securities involves risks. See “Risk Factors” beginning on page 1 of this prospectus and contained in our Annual Report on Form 10-K for the year ended December 31, 2023, which is incorporated herein by reference, as well as any risk factors included in, or incorporated by reference into, the applicable prospectus supplement, to read about factors you should consider before buying any securities issued by us.

The date of this prospectus is August 30, 2024.

TABLE OF CONTENTS

i

ABOUT THIS PROSPECTUS

This prospectus is a part of a registration statement on Form S-3 that we filed with the Securities and Exchange Commission, or the SEC, using a “shelf” registration process. Under the shelf registration process, we may from time to time offer any combination of the following securities described in this prospectus in one or more offerings: common stock, preferred stock, debt securities, depositary shares, warrants, stock purchase contracts and/or units.

Each time we offer and sell securities we will provide a prospectus supplement containing specific information about the terms of the securities being offered. That prospectus supplement may include a discussion of any risk factors or other special considerations that apply to those securities. The prospectus supplement may also add, update or change the information in this prospectus. If there is any inconsistency between the information in this prospectus (including the information incorporated by reference herein) and any prospectus supplement, you should rely on the information in that prospectus supplement. You should read both this prospectus and any prospectus supplement together with additional information described under the heading “Where You Can Find More Information.” We have not authorized anyone to provide you with different information and, if you are given any information or representation about these matters that is not contained or incorporated by reference in this prospectus or a prospectus supplement, you must not rely on that information. We are not making an offer to sell securities in any jurisdiction where the offer or sale of such securities is not permitted.

Neither the delivery of this prospectus or any applicable prospectus supplement nor any sale made using this prospectus or any applicable prospectus supplement implies that there has been no change in our affairs or that the information in this prospectus or in any applicable prospectus supplement is correct as of any date after their respective dates. You should not assume that the information in or incorporated by reference in this prospectus or any applicable prospectus supplement or any free writing prospectus prepared by us, is accurate as of any date other than the date(s) on the front covers of those documents. Our business, financial condition, results of operations and prospects may have changed since those dates.

The registration statement containing this prospectus, including the exhibits to the registration statement, provides additional information about us and the securities offered under this prospectus. The registration statement can be read at the SEC website mentioned under the heading “Where You Can Find More Information.”

We may sell securities to underwriters who will sell the securities to the public on terms fixed at the time of sale. In addition, the securities may be sold by us directly or through dealers or agents designated from time to time. If we, directly or through agents, solicit offers to purchase the securities, we reserve the sole right to accept and, together with our agents, to reject, in whole or in part, any of those offers.

The prospectus supplement will contain the names of the underwriters, dealers or agents, if any, together with the terms of offering, the compensation of those underwriters and the net proceeds to us. Any underwriters, dealers or agents participating in the offering may be deemed “underwriters” within the meaning of the Securities Act of 1933.

Unless otherwise indicated or unless the context requires otherwise, all references in this prospectus to “F.N.B.,” the “Corporation,” “we,” “us,” “our” or similar references mean F.N.B. Corporation.

RISK FACTORS

Investing in our securities involves risks. Before making an investment decision, you should carefully read and consider the risk factors that are set forth in the applicable prospectus supplement and in our most recent annual report on Form 10-K, which is incorporated by reference into this prospectus, as updated by our

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subsequent filings with the SEC under the Securities Exchange Act of 1934. You should also refer to all of the other information appearing in this prospectus and the applicable prospectus supplement or incorporated by reference into this prospectus in light of your particular investment objectives and financial circumstances.

WHERE YOU CAN FIND MORE INFORMATION

We file annual, quarterly and current reports, proxy statements and other information with the SEC. Our SEC filings are available over the Internet at the SEC’s website at http://www.sec.gov and on our website at www.fnbcorporation.com. Except as specifically incorporated by reference in this prospectus, information on those websites is not part of this prospectus.

INFORMATION INCORPORATED BY REFERENCE

The SEC allows us to “incorporate by reference” the information in the documents we file with the SEC. This means we can disclose important information to you by referring you to those documents. The information incorporated by reference is considered to be part of this prospectus, and later information that we file with the SEC will automatically update and supersede this information. We incorporate by reference the documents listed below and any later documents we may file with the SEC under Sections 13(a), 13(c), 14 or 15(d) of the Securities Exchange Act of 1934 before termination of the offering of securities under this prospectus (other than, in each case, documents or information deemed to have been furnished and not “filed” in accordance with SEC rules). The SEC file number for these documents is 001-31940.

We will provide you, at no cost, a copy of any or all documents referred to above which have been or may be incorporated by reference into this prospectus (excluding the exhibits to those documents unless they have been specifically incorporated by reference into the requested document). You may request these documents from:

Shareholder Relations

12 Federal Street

One North Shore Center

Pittsburgh, Pennsylvania 15212

(800) 555-5455

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CAUTIONARY STATEMENT REGARDING FORWARD-LOOKING INFORMATION

This prospectus and the information incorporated by reference herein may contain statements regarding our outlook for earnings, revenues, expenses, tax rates, capital and liquidity levels and ratios, asset quality levels, financial position and other matters regarding or affecting our current or future business and operations. These statements can be considered “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995. These forward-looking statements involve various assumptions, risks and uncertainties which can change over time. Actual results or future events may be different from those anticipated in our forward-looking statements and may not align with historical performance and events. As forward-looking statements involve significant risks and uncertainties, caution should be exercised against placing undue reliance upon such statements. Forward-looking statements are typically identified by words such as “believe,” “plan,” “expect,” “anticipate,” “intend,” “outlook,” “estimate,” “forecast,” “will,” “should,” “project,” “goal,” and other similar words and expressions. We do not assume any duty to update forward-looking statements, except as required by federal securities laws.

Our forward-looking statements are subject to the following principal risks and uncertainties:

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We caution that the risks identified here are not exhaustive of the types of risks that may adversely impact us and actual results may differ materially from those expressed or implied as a result of these risks and uncertainties, including, but not limited to, the risk factors and other uncertainties described under Item 1A. Risk Factors and the Risk Management sections of our 2023 Annual Report on Form 10-K (including the Management’s Discussion and Analysis section), our subsequent 2024 Quarterly Reports on Form 10-Q (including the risk factors and risk management discussions) and our other 2024 filings with the SEC, which are available on our corporate website at https://www.fnb-online.com/about-us/investor-information/reports-and-filings or the SEC’s website at www.sec.gov. We have included our web address as an inactive textual reference only. Information on our website is not part of our SEC filings.

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F.N.B. CORPORATION

We are a Pennsylvania corporation, a bank holding company and a financial holding company. With our subsidiaries, we have been in business since 1864. F.N.B. Corporation was formed in 1974 as a bank holding company. In 2000, the Corporation elected to become, and remains, a financial holding company under the Gramm-Leach-Bliley Act of 1999. As a diversified financial services holding company, F.N.B., through our subsidiaries, provides a full range of financial services, principally to consumers, corporations, governments and small- to medium-sized businesses in our market areas through our subsidiary network, which is led by our largest subsidiary, First National Bank of Pennsylvania. Our business strategy focuses primarily on providing quality, consumer- and commercial-based financial services adapted to the needs of each of the markets we serve. We seek to maintain our community orientation by providing local management with certain autonomy in decision making, enabling them to respond to customer requests more quickly and to concentrate on transactions within their market areas. We seek to preserve some decision making at a local level, however, we have centralized legal, loan review, credit underwriting, accounting, investment, audit, loan operations, deposit operations and data processing functions. The centralization of these processes enables us to maintain consistent quality of these functions and to achieve certain economies of scale.

As of June 30, 2024, we have three reportable business segments: Community Banking, Wealth Management and Insurance, along with certain other operations, and we have 345 Community Banking offices in Pennsylvania, Ohio, Maryland, West Virginia, North Carolina, South Carolina, Washington D.C. and Virginia.

As of June 30, 2024, the Corporation had total assets of $47.7 billion, loans and leases of $33.8 billion and deposits of $35 billion.

Our principal executive offices are located at 12 Federal Street, One North Shore Center, Pittsburgh, Pennsylvania 15212, and our telephone number is (800) 555-5455.

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THE SECURITIES WE MAY OFFER

We may use this prospectus to offer securities in one or more offerings. A prospectus supplement, which we will provide to prospective investors each time we offer securities, will describe the amounts, prices and detailed terms of the securities and may describe risks associated with an investment in the securities. We will also include in the prospectus supplement, where applicable, information about material United States federal income tax considerations relating to the securities. Terms used in this prospectus will have the meanings described in this prospectus unless otherwise specified. The securities of each class as described in this prospectus may also be offered and sold, from time to time, by one or more selling security holders to be identified in the future.

We may sell the securities to or through underwriters, dealers or agents or directly to purchasers. We, as well as any agents acting on our behalf, reserve the sole right to accept or to reject in whole or in part any proposed purchase of our securities. Each prospectus supplement will set forth the names of any underwriters, dealers or agents involved in the sale of our securities described in that prospectus supplement and any applicable fee, commission or discount arrangements with them.

This prospectus may not be used to sell securities unless accompanied by the applicable prospectus supplement.

Common Stock

We may sell our common stock, par value $0.01 per share. In a prospectus supplement, we will describe the aggregate number of shares offered and the offering price or prices of the shares.

Debt Securities

We may sell debt securities, including senior debt securities and subordinated debt securities, which may be senior or subordinated in priority of payment. We will provide a prospectus supplement that describes the ranking, whether senior or subordinated, the level of seniority or subordination (as applicable), the specific designation, the aggregate principal amount, the purchase price, the maturity, the redemption terms, the interest rate or manner of calculating the interest rate, the time of payment of interest, if any, the terms for any conversion or exchange, including the terms relating to the adjustment of any conversion or exchange mechanism, the listing, if any, on a securities exchange and any other specific terms of the debt securities.

Preferred Stock; Depositary Shares

We may sell shares of our preferred stock, par value $0.01 per share, in one or more series. In a prospectus supplement, we will describe the specific designation, the aggregate number of shares offered, the dividend rate or manner of calculating the dividend rate, the dividend periods or manner of calculating the dividend periods, the ranking of the shares of the series with respect to dividends, liquidation and dissolution, the liquidation preference of the shares of the series, the voting rights of the shares of the series, if any, whether and on what terms the shares of the series will be convertible or exchangeable, whether and on what terms we can redeem the shares of the series, whether we will offer depositary shares representing shares of the series and if so, the fraction or multiple of a share of preferred stock represented by each depositary share, whether we will list the preferred stock or depositary shares on a securities exchange and any other specific terms of the series of preferred stock.

Warrants

We may sell warrants to purchase our debt securities, depositary shares, shares of preferred stock or shares of our common stock. In a prospectus supplement, we will inform you of the exercise price and other specific terms of the warrants, including whether your or our obligations, if any, under any warrants may be satisfied by delivering or purchasing the underlying securities or their cash value.

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Purchase Contracts

We may sell purchase contracts, including purchase contracts issued as part of a unit with one or more other securities, for the purchase or sale of our debt securities, depositary shares, preferred stock or common stock. The price of our debt securities or price per share of common stock or preferred stock, as applicable, may be fixed at the time the purchase contracts are issued or may be determined by reference to a specific formula contained in the purchase contracts. We may sell purchase contracts in such amounts and in as many distinct series as we wish. The applicable prospectus supplement will describe the terms of any purchase contracts.

Units

We may sell any combination of one or more of the other securities described in this prospectus, together as units. In a prospectus supplement, we will describe the particular combination of securities constituting any units and any other specific terms of the units.

USE OF PROCEEDS

Unless we inform you otherwise in a prospectus supplement, we will use the net proceeds from the sale of any securities we sell for general corporate purposes, including working capital, acquisitions, capital expenditures and the repayment of indebtedness. Unless otherwise set forth in a prospectus supplement, we will not receive any proceeds in the event that the securities are sold by a selling security holder.

VALIDITY OF SECURITIES

Unless otherwise indicated in the applicable prospectus supplement, the validity of the securities offered by this prospectus will be passed upon for the Corporation by Reed Smith LLP, Pittsburgh, Pennsylvania.

EXPERTS

The consolidated financial statements of F.N.B. Corporation and subsidiaries appearing in our Annual Report (Form 10-K) for the year ended December 31, 2023 and the effectiveness of our internal control over financial reporting as of December 31, 2023 have been audited by Ernst & Young LLP, independent registered public accounting firm, as set forth in their reports thereon, included therein and incorporated herein by reference. Such consolidated financial statements are, and audited financial statements to be included in subsequently filed documents will be, incorporated herein in reliance upon the reports of Ernst & Young LLP pertaining to such financial statements and the effectiveness of our internal control over financial reporting as of the respective dates (to the extent covered by consents filed with the Securities and Exchange Commission) given on the authority of such firm as experts in accounting and auditing.

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$    

% Fixed Rate / Floating Rate Senior Notes due 2030

PROSPECTUS SUPPLEMENT

Joint Book-Running Managers

    , 2024