Celanese (CE) 424B2Prospectus for primary offering

Certain statements in this prospectus supplement or in other materials we have filed or will file with the Securities and Exchange Commission (“SEC”), and incorporated herein and the accompanying prospectus by reference, are forward-looking in nature as defined in Section 27A of the Securities Act of 1933, as amended (the “Securities Act”), Section 21E of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), and the Private Securities Litigation Reform Act of 1995. You can identify these statements by the fact that they do not relate to matters of a strictly factual or historical nature and generally discuss or relate to forecasts, estimates or other expectations regarding future events. Generally, the words “believe,” “expect,” “intend,” “estimate,” “anticipate,” “project,” “plan,” “may,” “can,” “could,” “might,” “will” and similar expressions identify forward-looking statements, including statements that relate to such matters as planned and expected capacity increases and utilization rates; anticipated capital spending; environmental matters; legal proceedings; sources of raw materials and exposure to, and effects of hedging of raw material and energy costs and foreign currencies; interest rate fluctuations; global and regional economic, political, business and regulatory conditions; expectations, strategies, and plans for individual assets and products, business segments, as well as for the whole Company; cash requirements and uses of available cash; financing plans; pension expenses and funding; anticipated restructuring, divestiture, and consolidation activities; planned construction or operation of facilities; cost reduction and control efforts and targets and integration of the acquired businesses.

Forward-looking statements are not historical facts or guarantees of future performance but instead represent only our beliefs at the time the statements were made regarding future events, which are subject to significant risks, uncertainties, and other factors, many of which are outside of our control and certain of which are listed below. Any or all of the forward-looking statements included in this prospectus supplement, the accompanying prospectus and in any other materials incorporated by reference herein may turn out to be materially inaccurate. This can occur as a result of incorrect assumptions, in some cases based upon internal estimates and analyses of current market conditions and trends, management plans and strategies, economic conditions, or as a consequence of known or unknown risks and uncertainties. Many of the risks and uncertainties mentioned in this prospectus supplement, the accompanying prospectus, or in other materials we have filed or will file with the SEC and incorporated herein by reference, such as those discussed in the section titled “Risk Factors” herein and in our Annual Report on Form 10-K for the year ended December 31, 2022, will be important in determining whether these forward-looking statements prove to be accurate. Consequently, no other person should place undue reliance on our forward-looking statements and should recognize that actual results may differ materially from those anticipated by us.

All forward-looking statements made in this prospectus supplement and the accompanying prospectus are made as of the date hereof, and the risk that actual results will differ materially from expectations expressed in this prospectus supplement and the accompanying prospectus will increase with the passage of time. We undertake no obligation, and disclaim any duty, to publicly update or revise any forward-looking statements, whether as a result of new information, future events, changes in our expectations or otherwise.

The following factors, among others, could cause our actual results to differ materially from those results, performance or achievements that may be expressed or implied by such forward-looking statements:

Additional information regarding these and other factors may be contained in our filings with the SEC incorporated by reference in this prospectus supplement and the accompanying prospectus, especially on

The indentures governing the Outstanding Notes do not, and the indenture governing the notes will not, prohibit us from incurring additional unsecured indebtedness in the future. We are also permitted to incur secured indebtedness that would be effectively senior to the notes subject to the limitations described in the section herein entitled “Description of the Notes — Certain Covenants — Liens.” The indentures for the Outstanding Notes do not, and the indenture governing the notes will not:

In addition, the indenture governing the notes will not require us to maintain any financial ratios or specific levels of net worth, revenues, income, cash flow or liquidity and, accordingly, will not protect holders of the notes in the event that we experience significant adverse changes in our financial condition or results of operations.

As a result of the foregoing, when evaluating the terms of the notes, you should be aware that the terms of the indenture and the notes do not restrict our ability to engage in, or to otherwise be a party to, a variety of corporate transactions, circumstances and events, such as certain acquisitions, refinancings or recapitalizations that could substantially and adversely affect our capital structure and the value of the notes. For these reasons, you should not consider the covenants in the indenture as a significant factor in evaluating whether to invest in the notes.

Certain of our borrowings are at variable rates of interest or are euro denominated, which exposes us to interest rate risk and currency exchange rate risk, respectively. If interest rates were to increase, our debt service obligations on our variable rate indebtedness would increase. As of June 30, 2023, we had $1.9 billion of variable rate debt subject to interest rate exposure. Accordingly, a 1% increase in interest rates would increase annual interest expense by $19 million.

Our ability to make scheduled payments on or to refinance our debt obligations depends on the financial condition and operating performance of our subsidiaries, which are subject to prevailing economic and competitive conditions and to certain financial, business and other factors beyond our control. We may not be able to maintain a level of cash flows from operating activities sufficient to permit us to pay the principal, premium, if any, and interest on our indebtedness, including the notes.

If our cash flows and capital resources are insufficient to fund our debt obligations, we may be forced to reduce or delay capital expenditures, sell assets on unfavorable terms, seek additional capital or restructure or refinance our indebtedness. These alternative measures may not be successful and may not permit us to meet our scheduled debt service and other obligations. In the absence of such operating results and resources,

The agreements governing our senior revolving credit facilities (the “Revolving Credit Agreements”) and term loan credit agreements (the “Term Loan Agreements” and, together with the Revolving Credit Agreements, the “Credit Agreements”), the indentures governing our Outstanding Notes and the amended and restated receivables purchase agreement (the “Purchase Agreement”) governing our accounts receivables securitization facility contain various covenants that limit our ability to engage in specified types of transactions. The Credit Agreements contain covenants including, but not limited to, restrictions on our and certain of our subsidiaries’ ability to incur additional debt; incur liens securing debt; merge or consolidate with any other person; and sell, assign, transfer, lease, convey or otherwise dispose of all or substantially all of the Issuer’s assets or the assets of certain subsidiaries. Additionally, the Credit Agreements require the maintenance of certain financial ratios. The indentures governing our Outstanding Notes contain covenants including, but not limited to, restrictions on our and certain of our subsidiaries’ ability to incur liens securing debt; merge or consolidate with any other person; and sell, assign, transfer, lease, convey or otherwise dispose of all or substantially all of the Issuer’s assets or the assets of certain subsidiaries.

The Purchase Agreement also contains covenants including, but not limited to, restrictions on CE Receivables LLC, a wholly-owned, “bankruptcy remote” special purpose subsidiary of the Company, and certain other Company subsidiaries’ ability to incur indebtedness; grant liens on assets; merge, consolidate, or sell assets; pay dividends or make other restricted payments; make investments; prepay or modify certain indebtedness; or engage in other businesses.

Such restrictions in the instruments governing our debt obligations could result in us having to obtain the consent of our lenders and holders of our Outstanding Notes and the notes in order to take certain actions. Disruptions in credit markets may prevent us from obtaining or make it more difficult or more costly for us to obtain such consents. Our ability to expand our business or to address declines in our business may be limited if we are unable to obtain such consents.

A breach of any of these covenants could result in a default, which, if not cured or waived, could have a material adverse effect on our business, financial condition and results of operations. Furthermore, a default under any of the Credit Agreements could permit lenders to accelerate the maturity of our indebtedness under such Credit Agreement and to terminate any commitments to lend. If the lenders under any Credit Agreement accelerate the repayment of such indebtedness, we may not have sufficient liquidity to repay such amounts or our other indebtedness, including the notes. In such event, we could be forced into bankruptcy or liquidation and, as a result, you could lose some or all of your investment in the notes.

As holding companies, the Issuer and Celanese, which we refer to as the Parent Guarantor, conduct substantially all of their operations through their subsidiaries, which own substantially all of our consolidated assets. Consequently, the principal source of cash to pay the Issuer’s and Parent Guarantor’s obligations, including obligations under the notes and the guarantee of the Issuer’s obligations under the notes by the Parent Guarantor, is the cash that our subsidiaries generate from their operations. We cannot assure you that our subsidiaries will be able to, or be permitted to, make distributions to enable the Issuer or the Parent Guarantor to make payments in respect of their obligations. Each of our subsidiaries is a distinct legal entity and, under certain circumstances, applicable country or state laws, regulatory limitations and terms of our debt instruments may limit our subsidiaries’ ability to distribute cash to the Issuer and the Parent Guarantor. While the Credit Agreements limit the ability of our subsidiaries to put restrictions on paying dividends or making other intercompany payments to us, these limitations are subject to certain qualifications and exceptions, which may have the effect of significantly restricting the applicability of those limits. In the event the Issuer and the Parent Guarantor do not receive distributions from our subsidiaries, the Issuer and

Each series of notes offered hereby is a new issue of securities with no established trading market, and we cannot assure you as to:

If markets were to exist for the notes, the notes could trade at prices that are lower than your purchase price, depending on many factors, including prevailing interest rates, the markets for similar notes and our financial performance. We do not intend to apply for listing of the notes of each series. Although the underwriters have informed us that they currently intend to make markets in the notes after we complete the offering, they have no obligation to do so and may discontinue market-making in the notes at any time without notice. If no active trading markets develop, you may not be able to sell your notes at a particular time and the prices that you receive when you sell may not be favorable.

The condition of the financial markets and prevailing interest rates have fluctuated in the past and are likely to fluctuate in the future, which could have an adverse effect on the market prices of the notes.

Rating agencies continually review the ratings they have assigned to companies and debt securities. Negative changes in the ratings assigned to us or our debt securities could have an adverse effect on the market prices of the notes.

The change of control event provisions in the indenture governing the notes may not protect you in the event we consummate a highly leveraged transaction, reorganization, restructuring, merger or other similar transaction, unless such transaction constitutes a change of control event under the indenture. Such a transaction may not involve a change in voting power or beneficial ownership or, even if it does, may not involve a change in the magnitude required under the definition of change of control in the indenture to trigger our obligation to repurchase the notes. Except as otherwise described above, the indenture does not contain provisions that permit the holders of the notes to require the Issuer to repurchase or redeem the notes in the event of a takeover, recapitalization or similar transaction. See “Description of the Notes — Repurchase at the Option of Holders — Change of Control Offer.”

Subject to the restrictions in the indentures governing the Outstanding Notes and the notes, we, including our subsidiaries, may incur significant indebtedness secured by assets. If we are declared bankrupt or insolvent, or if we default under any of our future indebtedness secured by assets, the holders of such indebtedness could declare all of the funds borrowed thereunder, together with accrued interest, immediately due and payable. If we were unable to repay such indebtedness, the holders of such indebtedness could, to the extent of such indebtedness, foreclose on such assets to the exclusion of holders of the notes. In any such event, because the notes will not be secured by our assets, remaining proceeds, if any, from the sale of such assets will be available to pay obligations on the notes only after such indebtedness has been paid in full.

The registered holder of any note will be treated as the owner of it for all purposes. Only registered holders will have rights under the indenture.

The Issuer will issue $      aggregate principal amount of its    % Senior Notes due 2028 (the “2028 notes”), $      aggregate principal amount of its    % Senior Notes due 2030 (the “2030 notes”), and $      aggregate principal amount of its    % Senior Notes due 2033 (the “2033 notes” and together with the 2028 notes and the 2030 notes, the “notes”) in this offering.

The 2028 notes will mature on          , 2028, the 2030 notes will mature on         , 2030, and the 2033 notes will mature on           , 2033. The indenture governing the notes will provide for the issuance of additional notes of the same class and series, subject to compliance with the covenants contained in the indenture. The notes will be issued in minimum denominations of $2,000 and integral multiples of $1,000 in excess thereof.

Interest on the 2028 notes will accrue at the rate of    % per annum and will be payable semi-annually in arrears on                 and                 , commencing on                 ,      . The Issuer will make each interest payment to the holders of record of the notes on the immediately preceding                 and                 .

Interest on the 2030 notes will accrue at the rate of    % per annum and will be payable semi-annually in arrears on                 and                 , commencing on                 ,      . The Issuer will make each interest payment to the holders of record of the notes on the immediately preceding                 and                 .

Interest on the 2033 notes will accrue at the rate of    % per annum and will be payable semi-annually in arrears on                 and                 , commencing on                 ,      . The Issuer will make each interest payment to the holders of record of the notes on the immediately preceding                 and                 .

Interest on the notes will accrue from the date of original issuance or, if interest has already been paid, from the date it was most recently paid. Interest will be computed on the basis of a 360 day year comprised of twelve 30-day months.

The interest rate payable on the notes of each series will be subject to adjustments from time to time if either Moody’s or S&P (or, if either Moody’s or S&P ceases to rate the notes of that series or fails to make a

The interest rate and the amount of interest payable on the notes will be determined and calculated by us. For the avoidance of doubt, the Trustee shall have no duty to monitor any ratings of the notes, or to determine if an adjustment to any interest rate is to be made or what an interest rate should be, or make any other determinations or calculations in respect of the interest amounts due on the notes, or to notify the holders of any of the foregoing or determine the consequences thereof.

The Trustee will initially act as paying agent and registrar. The Issuer may change the paying agent or registrar without prior notice to the holders, and the Issuer or any of its Subsidiaries may act as the paying agent or registrar.

A holder may transfer or exchange notes in accordance with the indenture. The registrar and the Trustee may require a holder to furnish appropriate endorsements and transfer documents in connection with a transfer of notes. Holders will be required to pay all taxes due on transfer. The Issuer is not required to transfer or exchange any note selected for redemption or repurchase. Also, the Issuer is not required to transfer or exchange any note for a period of 15 days before a selection of notes to be redeemed or repurchased.

The notes will be general unsecured obligations of the Issuer that rank senior in right of payment to all existing and future Indebtedness that is expressly subordinated in right of payment to the notes. The notes will rank equally in right of payment with all existing and future liabilities of the Issuer that are not so subordinated and will be effectively subordinated to (a) all of the Issuer’s Secured Debt, if any, to the extent of the value of the assets securing such Indebtedness and (b) liabilities of our Subsidiaries that do not guarantee the notes. In the event of bankruptcy, liquidation, reorganization or other winding up of the Issuer or the Guarantors or upon a default in payment with respect to, or the acceleration of, any senior secured Indebtedness, the assets of the Issuer and the Guarantors that secure such senior secured Indebtedness will be available to pay obligations on the notes and the Guarantees only after all Indebtedness under such senior secured Indebtedness has been repaid in full from such assets. We advise you that there may not be sufficient assets remaining to pay amounts due on any or all the notes and the Guarantees then outstanding.

Some of the Subsidiaries of the Issuer will not guarantee the notes, and, as described above under “— Guarantees,” Guarantees of Subsidiaries may be released under certain circumstances. In addition, future Subsidiaries of the Issuer may not be required to guarantee the notes. Claims of creditors of any Subsidiaries that are not Guarantors, including trade creditors and creditors holding indebtedness or guarantees issued by such Subsidiaries, and claims of preferred stockholders of such Subsidiaries generally will have priority with respect to the assets and earnings of such Subsidiaries over the claims of creditors of the Issuer, including holders of the notes. Accordingly, the notes and each Guarantee will be effectively subordinated to creditors (including trade creditors) and preferred stockholders, if any, of such Subsidiaries that are not Guarantors.

The indenture does not impose any limitation on the incurrence of unsecured Indebtedness and preferred stock by the Issuer and certain of its Subsidiaries.

Prior to (i) in the case of the 2028 notes,      , 20      (one month before the maturity date of the 2028 notes), (ii) in the case of the 2030 notes,   , 20      (two months before the maturity date of the 2030 notes), and (iii) in the case of the 2033 notes,      , 20      (three months before the maturity date of

On or after the Applicable Par Call Date, the Issuer may redeem any series of notes, in whole or in part, at any time and from time to time, at a redemption price equal to 100% of the principal amount of the notes of such series being redeemed plus accrued and unpaid interest thereon to the redemption date.

The Issuer’s actions and determinations in determining the redemption price shall be conclusive and binding for all purposes, absent manifest error.

Notices under this optional redemption section 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.

In the case of a partial redemption, selection of the notes for redemption will be made as set forth in “Selection and Notice” below.

Unless the Issuer 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.

The Issuer may also acquire notes by means other than a redemption, whether by tender offer, open market purchases, negotiated transactions or otherwise, in accordance with applicable securities laws, so long as such acquisition does not otherwise violate the terms of the indenture.

The Issuer is not required to make mandatory redemption or sinking fund payments with respect to the notes.

The provisions described above that require the Issuer to make a Change of Control Offer following a Change of Control Event will be applicable whether or not any other provisions of the indenture are applicable. Except as described above with respect to a Change of Control Event, the indenture contains no provisions that permit the holders of the notes to require that the Issuer repurchase or redeem the notes in the event of a takeover, recapitalization or similar transaction.

The Issuer will not be required to make a Change of Control Offer upon a Change of Control Event if (1) a third party makes the Change of Control Offer in the manner, at the times and otherwise in compliance with the requirements set forth in the indenture applicable to a Change of Control Offer made by the Issuer and purchases all notes properly tendered and not withdrawn under the Change of Control Offer or (2) notice of redemption has been given pursuant to the indenture as described above under the caption “— Optional Redemption,” unless and until there is a default in the payment of the applicable redemption price. Notwithstanding anything to the contrary contained herein, a Change of Control Offer may be made in advance of a Change of Control Event or conditional upon the occurrence of a Change of Control Event, if a definitive agreement is in place for the Change of Control at the time the Change of Control Offer is made and such Change of Control Offer is otherwise made in compliance with the provisions of this covenant.

The definition of Change of Control includes a phrase relating to the direct or indirect sale, lease, transfer, conveyance or other disposition of “all or substantially all” of the properties or assets of the Issuer and its Subsidiaries taken as a whole. 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, the ability of a holder of notes to require the Issuer to repurchase its notes as a result of a sale, lease, transfer, conveyance or other disposition of less than all of the assets of the Issuer and its Subsidiaries taken as a whole to another Person or group may be uncertain.

Also see “Risk Factors — Risks Relating to the Notes, the Guarantees and our Level of Indebtedness —  We may be unable to purchase the notes upon a change of control event.”

If less than all of each series of the notes under the indenture are to be redeemed at any time, the Trustee will select the notes for redemption as follows:

Notice of any redemption of the notes in connection with a transaction or an event may, at our discretion, be given prior to the completion or the occurrence thereof. Any redemption or notice may, at our discretion, be subject to one or more conditions precedent, including, but not limited to, completion or occurrence of a related transaction or event (such as an equity or equity-linked offering, an incurrence of indebtedness or an acquisition or other strategic transaction involving a change of control in us or another entity). At our discretion, the redemption date may be delayed until such time as any or all such conditions shall be satisfied, or such redemption may not occur and such notice may be rescinded in the event that any or all such conditions shall not have been satisfied by the redemption date, or by the redemption date as so delayed. We will provide written notice to the Trustee prior to the close of business two Business Days prior to the redemption date if any such redemption has been rescinded or delayed. Upon receipt of such notice of the delay of such date of redemption or the rescission of such notice of redemption, such date of redemption shall be automatically delayed or such notice of redemption shall be automatically rescinded, as applicable, and the redemption of the notes shall be automatically delayed or rescinded and cancelled, as applicable, as provided in such notice.

If any note is to be redeemed in part only, the notice of redemption that relates to that note will state the portion of the principal amount of that note that is to be redeemed. A new note in principal amount equal to the unredeemed portion of the original note will be issued in the name of the holder of notes upon cancellation of the original note. However, no notes of $2,000 or less will be redeemed in part. Notes called for redemption become due on the date fixed for redemption. On and after the redemption date, interest ceases to accrue on notes or portions of them called for redemption if funds sufficient to pay the redemption price have been deposited with a paying agent.

The Issuer will not, and will not permit any Subsidiary to, create, incur, issue, assume or guarantee any Indebtedness secured by a Lien (other than Permitted Liens) upon any Principal Property or Capital Stock of any Subsidiary that directly owns any Principal Property without in any such case making or causing to be made effective provision whereby the notes (together with, if the Issuer shall so determine, any other Indebtedness of the Company or such Subsidiary then existing or thereafter created which is not subordinate to the notes) shall be secured equally and ratably with (or prior to) such Indebtedness, so long as such Indebtedness shall be so secured, unless after giving effect thereto, the aggregate amount (without duplication) of all such Indebtedness plus all Attributable Debt of the Issuer and its Subsidiaries in respect of any Sale and Leaseback Transaction would not exceed 15% of Consolidated Net Tangible Assets.

The Issuer will not, and will not permit any of its Subsidiaries to, enter into any Sale and Lease-Back Transaction with respect to any Principal Property unless,

The availability of the foregoing reports on the Commission’s EDGAR service (or successor thereto) shall be deemed to satisfy the Issuer’s delivery obligations to the Trustee and holders.

Delivery of such reports, information and documents to the Trustee is for informational purposes only, and the Trustee’s receipt of such shall not constitute actual or constructive knowledge or notice of any information contained therein or determinable from information contained therein, including the Issuer’s compliance with any of its covenants hereunder (as to which the Trustee is entitled to rely exclusively on Officer’s Certificates). The Trustee shall have no duty to monitor or confirm, on a continuing basis or otherwise, the Issuer’s or any other person’s compliance with any of the covenants under the indenture, to determine whether the Issuer posts reports, information or documents on the SEC’s website (including via the EDGAR filing system), the Issuer’s (or Parent’s) website or otherwise, to collect any such information from the SEC’s website (including via the EDGAR filing system), the Issuer’s (or Parent’s) website or otherwise, or to review or analyze reports delivered to it to ensure compliance with the provisions of the indenture, to ascertain the correctness or otherwise of the information or the statements contained therein or to participate in any conference calls.

If an Event of Default (other than an Event of Default specified in clause (e) above with respect to the Issuer) shall occur and be continuing, the Trustee or the holders of at least 25% in principal amount of

The indenture will be discharged and will cease to be of further effect as to all notes issued thereunder, when:

In addition, the Issuer must deliver an Officers’ Certificate and an opinion of counsel to the Trustee stating that all conditions precedent to satisfaction and discharge have been satisfied.

If the Trustee becomes a creditor of the Issuer, the indenture limits its right to obtain payment of claims in certain cases, or to realize on certain property received in respect of any such claim as security or otherwise. The Trustee will be permitted to engage in other transactions; however, if it acquires any conflicting interest it must eliminate such conflict within 90 days, apply to the Commission for permission to continue or resign.

Notices to holders of the notes will be sent by mail or email to the registered holders, or otherwise in accordance with the procedures of the applicable depositary.

The indenture, the notes and the Guarantees will be governed by, and construed in accordance with, the laws of the State of New York.

Set forth below are certain defined terms used in the indenture. Reference is made to the indenture for a full disclosure of all such terms, as well as any other capitalized terms used herein for which no definition is provided.

The Issuer shall (i) calculate the Applicable Premium on the second Business Day preceding the applicable redemption date and (ii) prior to such redemption date, file with the Trustee an Officers’ Certificate setting forth the Applicable Premium and showing the calculation of such in reasonable detail. The Trustee will have no responsibility for the calculation of the Applicable Premium and will have no duty to verify the Issuer’s calculation.

The Treasury Rate shall be determined by the Issuer as of 4:15 p.m., New York City time (or as of 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 as of 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 Issuer 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 Applicable 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 Applicable 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

Neither DTC nor Cede & Co. (nor any other DTC nominee) will consent or vote with respect to the Global Securities unless authorized by a Direct Participant in accordance with DTC’s procedures. Under its usual procedures, DTC mails an Omnibus Proxy to us as soon as possible after the record date. The Omnibus Proxy assigns Cede & Co.’s consenting or voting rights to those Direct Participants to whose accounts the Global Securities are credited on the record date (identified in a listing attached to the Omnibus Proxy). Principal and interest payments on the Global Securities will be made to Cede & Co., or such other nominee as may be requested by an authorized representative of DTC. DTC’s practice is to credit Direct Participants’ accounts, upon DTC’s receipt of funds and corresponding detail information from us or the Trustee, on payable date in accordance with their respective holdings shown on DTC’s records. Payments by Participants to Beneficial Owners will be governed by standing instructions and customary practices, as is the case with securities held for the accounts of customers in bearer form or registered in “street name,” and will be the responsibility of such Participant and not of DTC, the Trustee or us, subject to any statutory or regulatory requirements as may be in effect from time to time. Payment of principal, premium, if any, and interest to Cede & Co. (or such other nominee as may be requested by an authorized representative of DTC) is our responsibility or that of the Trustee, disbursement of such payments to Direct Participants will be the responsibility of DTC, and disbursement of such payments to the Beneficial Owners will be the responsibility of Direct and Indirect Participants.

If less than all of each series of the notes are being redeemed, DTC’s practice is to determine by lot the amount of the interest of each Direct Participant in such issue to be redeemed.

DTC may discontinue providing its services as depository with respect to the Global Securities at any time by giving reasonable notice to us or the Trustee. Under such circumstances, in the event that a successor securities depository is not obtained, Global Security certificates are required to be printed and delivered.

We may decide to discontinue use of the system of book-entry-only transfers through DTC (or a successor securities depository). In that event, Global Security certificates will be printed and delivered to DTC.

Links have been established among DTC, Clearstream and Euroclear to facilitate the initial issuance of the notes sold outside of the United States and cross-market transfers of the notes associated with secondary market trading.

Although DTC, Clearstream and Euroclear have agreed to the procedures provided below in order to facilitate transfers, they are under no obligation to perform these procedures, and these procedures may be modified or discontinued at any time.

The information in this section concerning DTC, Clearstream and Euroclear and DTC’s book-entry system has been obtained from sources that we believe to be reliable, but neither we nor the underwriters take any responsibility for the accuracy or completeness of this information.

Settlement for the notes will be made by the underwriters in immediately available funds. All payments of principal, premium, if any, and interest in respect of the notes will be made by us in immediately available funds. Secondary trading in long-term notes and debentures of corporate issuers is generally settled in clearing-house or next-day funds. In contrast, the notes will trade in DTC’s Same-Day Funds Settlement System until maturity or earlier redemption or until the notes are issued in certificated form, and secondary market trading activity in the notes will therefore be required by DTC to settle in immediately available funds. No assurance can be given as to the effect, if any, of settlement in immediately available funds on trading activity in the notes.

Clearstream and Euroclear will record the ownership interests of their participants in much the same way as DTC, and DTC will record the total ownership of each of the U.S. agents of Clearstream and Euroclear, as participants in DTC. When notes are to be transferred from the account of a Direct Participant to the account of a Clearstream Participant or a Euroclear Participant, the purchaser must send instructions to Clearstream or Euroclear through a participant at least one day prior to settlement. Clearstream or Euroclear, as the case may be, will instruct its U.S. agent to receive notes against payment.

After settlement, Clearstream or Euroclear will credit its participant’s account. Credit for the notes will appear on the next day (European time). Because settlement is taking place during New York business hours, Direct Participants will be able to employ their usual procedures for sending notes to the relevant U.S. agent acting for the benefit of Clearstream or Euroclear Participants. The sale proceeds will be available to the DTC seller on the settlement date. As a result, to the Direct Participant, a cross-market transaction will settle no differently than a trade between two Direct Participants.

When a Clearstream or Euroclear Participant wishes to transfer notes to a Direct Participant, the seller will be required to send instructions to Clearstream or Euroclear through a participant at least one Business Day prior to settlement. In these cases, Clearstream or Euroclear will instruct its U.S. agent to transfer these notes against payment for them. The payment will then be reflected in the account of the Clearstream or Euroclear Participant the following day, with the proceeds back-valued to the value date, which would be the preceding day, when settlement occurs in New York. If settlement is not completed on the intended value date, that is, the trade fails, proceeds credited to the Clearstream or Euroclear Participant’s account will instead be valued as of the actual settlement date.

You should be aware that investors will only be able to make and receive deliveries, payments and other communications involving the notes through Clearstream and Euroclear on days when those systems are

The following is a summary of certain United States federal income tax consequences of the acquisition, ownership and disposition of the notes. It is based on provisions of the Internal Revenue Code of 1986, as amended (the “Code”), existing and proposed Treasury regulations promulgated thereunder (the “Treasury Regulations”) and administrative and judicial interpretations thereof, all as of the date hereof and all of which are subject to change, possibly on a retroactive basis. No ruling from the Internal Revenue Service (the “IRS”) has been or is expected to be sought with respect to any aspect of the transactions described herein. Accordingly, no assurance can be given that the IRS will agree with the views expressed in this summary or that a court will not sustain any challenge by the IRS in the event of litigation.

This summary is limited to notes purchased for cash upon their initial issuance at their “issue price” (i.e., the first price at which a substantial amount of the applicable series of notes is sold for money to investors, excluding sales to bond houses, brokers or similar persons or organizations acting in the capacity of underwriters, placement agents or wholesalers) and held as capital assets within the meaning of Section 1221 of the Code. This summary does not address all of the United States federal income tax consequences that may be relevant to particular holders in light of their personal circumstances, or to certain types of holders that may be subject to special tax treatment (such as banks and other financial institutions, real estate investment trusts and regulated investment companies, employee stock ownership plans, entities treated as partnerships for United States federal income tax purposes or investors therein, former citizens or residents of the United States, “controlled foreign corporations,” “passive foreign investment companies,” corporations that accumulate earnings to avoid United States federal income tax, insurance companies, tax-exempt entities, dealers in securities, brokers, “United States holders” ​(as defined below) whose functional currency is not the United States dollar or who hold notes through a foreign entity or foreign account, non-United States trusts and estates with United States beneficiaries, persons subject to the alternative minimum tax, persons required to accelerate the recognition of any item of gross income with respect to the notes as a result of such income being recognized on an applicable financial statement or persons who hold the notes as a hedge or who hedge the interest rate on the notes). In addition, this summary does not include any discussion of the tax laws of any state, local or non-United States government that may be applicable to a particular holder, and does not consider any aspects of United States federal tax law other than United States federal income taxation (such as estate and gift taxes).

For purposes of this discussion, a “United States holder” is a beneficial owner of the notes that is, for United States federal income tax purposes:

For purposes of this discussion, a “non-United States holder” is a beneficial owner that is not a United States holder and is not treated as a partnership or other pass-through entity for United States federal income tax purposes.

If an entity treated as a partnership for United States federal income tax purposes holds the notes, the United States federal income tax treatment of a partner in the partnership generally will depend on such partner’s particular circumstances and on the activities of the partnership. Partners in partnerships considering an investment in the notes should consult their own tax advisors.

If you are considering the purchase of the notes, you should consult your own tax advisor concerning the United States federal income tax consequences to you in light of your own specific situation, and any consequences arising under other United States federal tax laws or the laws of any other taxing jurisdiction.

We may be obligated to pay an amount in excess of the stated interest and principal amount of the notes or to make payments in advance of their scheduled time, as described under the headings “Description of the Notes — Redemption — Optional Redemption,” “— Repurchase at the Option of Holders — Change of Control Offer,” and “Description of the Notes — Interest Rate Adjustment Based on Certain Rating Events.” The potential obligation to make these payments could subject the notes to the provisions of the Treasury Regulations relating to “contingent payment debt instruments.” Under these regulations, however, one or more contingencies will not cause a debt instrument to be treated as a contingent payment debt instrument if, as of the issue date of the notes, such contingencies in the aggregate are “remote” or are considered to be “incidental.” or, in certain circumstances, if it is “significantly more likely than not” that none of such contingencies will occur. We intend to take the position that the likelihood that we will pay these contingent amounts is remote or these amounts are incidental, or it is “significantly more likely than not” that we will not pay these contingent amounts, and therefore that the notes should not be treated as contingent payment debt instruments, and we do not intend to treat them as such. Our position is binding on a holder, unless the holder discloses in the proper manner to the IRS that it is taking a different position. However, this determination is not binding on the IRS and is inherently factual, and we can give you no assurance that our position would be sustained if challenged by the IRS. A successful challenge of this position by the IRS could adversely affect the timing and amount of a holder’s income and would require a holder to treat any gain realized from a sale or other taxable disposition of a note as ordinary income rather than capital gain. The remainder of this disclosure assumes that the notes will not be considered contingent payment debt instruments. Holders are urged to consult their own tax advisors regarding the potential application to the notes of the contingent payment debt regulations and the consequences thereof.

It is expected, and this discussion assumes, that the notes will be issued without original issue discount for U.S. federal income tax purposes. Interest on the notes will generally be taxable to a United States holder as ordinary interest income as the interest accrues or is paid in accordance with the holder’s regular method of tax accounting.

Upon a sale, exchange, redemption, retirement or other taxable disposition of a note, a United States holder generally will recognize taxable gain or loss equal to the difference, if any, between (a) the amount of the cash and the fair market value of any property received on the sale or other taxable disposition (less an amount equal to any accrued and unpaid interest, which will be taxable as interest income as discussed above to the extent not previously included in income), and (b) the United States holder’s adjusted tax basis in the note. A United States holder’s adjusted tax basis in a note generally will be equal to the holder’s cost therefor.

Any gain or loss realized on the sale, exchange, redemption, retirement or other taxable disposition of a note will generally be capital gain or loss and will be long-term capital gain or loss if at the time of the disposition the United States holder’s holding period in the note exceeds one year. Long-term capital gains of non-corporate United States holders generally are taxed at preferential rates. The deductibility of capital losses is subject to limitations.

Certain United States holders who are individuals, estates or certain trusts generally must pay an additional 3.8% Medicare tax on the lesser of (a) the United States person’s “net investment income” for the relevant taxable year and (b) the excess of the United States person’s modified adjusted gross income for the taxable year over a certain threshold (which in the case of individuals will be between $125,000 and $250,000 depending on the individual’s circumstances). Net investment income will generally include interest income and net gains from the disposition of the notes, unless such interest income or net gains are derived in the ordinary course of the conduct of a trade or business (other than a trade or business that

BofA Securities, Inc., HSBC Securities (USA) Inc. and J.P. Morgan Securities LLC are acting as representatives of each of the underwriters named below. Subject to the terms and conditions set forth in a firm commitment underwriting agreement among us and the underwriters, we have agreed to sell to the underwriters, and each of the underwriters has agreed, severally and not jointly, to purchase from us, the principal amount of notes set forth opposite its name below.

We have agreed to indemnify the underwriters and their controlling persons against certain liabilities in connection with this offering, including liabilities under the Securities Act, or to contribute to payments the underwriters may be required to make in respect of those liabilities. We have also agreed to reimburse the underwriters for their legal and other expenses incurred in connection with the offering.

The underwriters are offering the notes, subject to prior sale, when, as and if issued to and accepted by them, subject to approval of legal matters by their counsel, including the validity of the notes, and other conditions contained in the underwriting agreement, such as the receipt by the underwriters of officer’s certificates and legal opinions. The underwriters reserve the right to withdraw, cancel or modify offers to the public and to reject orders in whole or in part.

The representatives have advised us that the underwriters propose initially to offer the notes to the public at the applicable public offering prices set forth on the cover page of this prospectus supplement. After the initial offering, the public offering prices or any other terms of the offering may be changed. The underwriters may offer and sell notes through certain of their affiliates.

The expenses of the offering, not including the underwriting discounts, are estimated to be $      and are payable by us.

Each series of the notes is a new issue of securities with no established trading markets. We do not intend to list the notes on any securities exchange or any automated dealer quotation system. Although the underwriters have informed us that they currently intend to make markets in the notes after we complete the offering, they have no obligation to do so and may discontinue making markets in the notes at any time without notice. We cannot assure you that liquid trading markets for the notes will develop, that you will be able to sell your notes at a particular time or that the prices you receive when you sell will be favorable.

We expect the delivery of the notes will be made to investors on or about      , 2023, which will be the           business day following the date of pricing of the notes (such settlement being referred to as T+           ). Under Rule 15c6-1 under the Securities Exchange Act of 1934, trades in the secondary market are required to settle in two business days, unless the parties to any such trade expressly agree

In connection with the offering, the underwriters may over allot or effect transactions which stabilize or maintain the market prices of the notes at levels which might not otherwise prevail. These transactions may include short sales and purchases on the open market to cover positions created by short sales. Short sales involve the sale by the underwriters of a greater principal amount of notes than they are required to purchase in the offering. The underwriters must close out any short position by purchasing notes in the open market. A short position is more likely to be created if the underwriters are concerned that there may be downward pressure on the price of the notes in the open market after pricing that could adversely affect investors who purchase in the offering.

Similar to other purchase transactions, the underwriters’ purchases to cover the syndicate short sales may have the effect of raising or maintaining the market prices of the notes or preventing or retarding a decline in the market prices of the notes. As a result, the prices of the notes may be higher than the price that might otherwise exist in the open market.

Neither we nor any of 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 prices of the notes. In addition, neither we nor any of the underwriters make any representation that the representatives will engage in these transactions or that these transactions, once commenced, will not be discontinued without notice.

Some of the underwriters and their affiliates have engaged in, and may in the future engage in, investment banking, financial advisory services 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.

Sales in the United States may be made through certain affiliates of the underwriters. One or more of the Underwriters may use affiliates or other appropriately licensed entities for sales of the notes in jurisdictions in which such Underwriters are not otherwise permitted.

Certain of the underwriters or their respective affiliates have a lending relationship with us, and as a result certain of these underwriters or their respective affiliates routinely hedge, and certain of those underwriters or their respective affiliates may hedge or otherwise reduce, their credit exposure to us consistent with their customary risk management policies. Typically, these underwriters and their respective 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.

Certain of the underwriters or their affiliates are agents, arrangers and/or lenders under our Credit Agreements.

Affiliates of certain of the underwriters are lenders under our three-year term loan credit agreement and accordingly will receive a portion of the net proceeds from this offering. In addition, certain of the

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 (“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 (EU) 2016/97 (as amended, the “Insurance Distribution Directive”), 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 Directive 2017/1129 (as amended, 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. For the purposes of this section, the expression an “offer of notes to the public” in relation to any notes in any relevant Member State of the EEA means the communication in any form and by any means of sufficient information on the terms of the offer and the notes to be offered so as to enable an investor to decide to purchase or subscribe the notes, as the same may be varied in that relevant Member State by any measure implementing the Prospectus Regulation in that relevant Member State. This prospectus supplement has 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 notes. This prospectus supplement is not a prospectus for the purposes of the Prospectus Regulation.

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 United Kingdom (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 by virtue of the European Union (Withdrawal) Act 2018 (“EUWA”); (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 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 by virtue of the EUWA; or (iii) not a qualified investor as defined in Article 2 of Regulation (EU) 2017/1129 as it forms part of domestic law by virtue of the EUWA. Consequently, no key information document required by Regulation (EU) No 1286/2014 as it forms part of domestic law by virtue of the EUWA (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.

In addition, in the UK, this prospectus supplement and the accompanying prospectus are being distributed only to, and are directed only at persons who: (i) have professional experience in matters relating to investments and who qualify as investment professionals within the meaning of Article 19(5) of the Financial Services and Markets Act 2000 (Financial Promotion) Order 2005 (as amended, the “Order”), (ii) are persons falling within Article 49(2)(a) to (d) (“high net worth companies, unincorporated associations etc.”) of the Order, (iii) are outside the UK, and/or (iv) are persons to whom an invitation or inducement to engage in investment activity (within the meaning of Section 21 of the Financial Services and Markets Act 2000, as amended (“FSMA”)) in connection with the issue or sale of the notes may otherwise lawfully be communicated or caused to be communicated (all such persons together being referred to as “relevant persons”). In the UK, this prospectus supplement and the accompanying prospectus are directed only at relevant persons and must not be acted on or relied on by persons who are not relevant persons and any investment or investment activity to which this prospectus supplement and accompanying prospectus relates are available only to relevant persons and will be engaged in only with relevant persons. The notes are being offered solely to “qualified investors” as defined in the UK Prospectus Regulation.

Neither this prospectus supplement nor the accompanying prospectus has been approved by or registered with the Securities and Futures Commission of Hong Kong or the Registrar of Companies of Hong Kong. The notes will not be offered or sold in Hong Kong other than (a) to “professional investors” as defined in the Securities and Futures Ordinance (Cap. 571) of Hong Kong and any rules made under that Ordinance; or (b) in other circumstances which do not result in the document being a “prospectus” as defined in the Companies Ordinance (Cap. 32) of Hong Kong or which do not constitute an offer to the public within the meaning of that Ordinance. No advertisement, invitation or document relating to the notes which is directed at, or the contents of which are likely to be accessed or read by, the public of Hong Kong (except if permitted to do so under the securities laws of Hong Kong) has been issued or will be issued in Hong Kong or elsewhere other than with respect to notes which are or are intended to be disposed of only to persons outside Hong Kong or only to “professional investors” as defined in the Securities and Futures Ordinance and any rules made under that Ordinance.

Neither this prospectus supplement nor the accompanying prospectus has been registered as a prospectus with the Monetary Authority of Singapore. Accordingly, this prospectus supplement and any other document or material in connection with the offer or sale, or invitation for subscription or purchase, of the notes may not be circulated or distributed, nor may the notes be offered or sold, or be made the subject of an invitation for subscription or purchase, whether directly or indirectly, to persons in Singapore other than (a) to an institutional investor under Section 274 of the Securities and Futures Act (Chapter 289) (the “SFA”), (b) to a relevant person, or any person pursuant to Section 275(1A), and in accordance with the conditions, specified in Section 275 of the SFA or (c) otherwise pursuant to, and in accordance with the conditions of, any other applicable provision of the SFA.

The following is a summary of select provisions of Celanese’s capital stock, as well as other certain provisions of Celanese’s Second Amended and Restated Certificate of Incorporation, as amended (the “Charter”), and Seventh Amended and Restated By-laws (the “By-laws”). The descriptions set forth below are qualified in their entirety by reference to the relevant provisions of the Charter and By-laws, copies of which have been filed as exhibits to the registration statement of which this prospectus forms a part.

As of February 24, 2023, the Company’s authorized capital stock consisted of (i) 400,000,000 shares of common stock (“Common Stock”), par value $0.0001 per share, of which 170,135,621 shares were issued and 108,474,128 shares were outstanding, and (ii) 100,000,000 shares of preferred stock, par value $0.01 per share, of which none were issued and outstanding.

Celanese’s Charter authorizes the board of directors to establish one or more series of preferred stock and to determine, with respect to any series of preferred stock, the terms and rights of that series, including:

The following is a general description of the debt securities that we may offer from time to time. The particular terms of the debt securities offered by any prospectus supplement and the extent, if any, to which the general provisions described below may apply to those securities will be described in the applicable prospectus supplement. As you read this section, please remember that the specific terms of a debt security as described in the applicable prospectus supplement will supplement and may modify or replace the general terms described in this section. If there are any differences between the applicable prospectus supplement and this prospectus, the applicable prospectus supplement will control. As a result, the statements we make in this section may not apply to the debt security you purchase.

The registered holder of any debt security will be treated as the owner of it for all purposes. Only registered holders will have rights under the applicable indenture.

Neither Celanese US nor Celanese may, directly or indirectly: (1) consolidate or merge with or into or wind up into another person (whether or not Celanese US is the surviving person); or (2) sell, assign, transfer, convey or otherwise dispose of all or substantially all of its properties or assets, in one or more related transactions, to another person; unless:

The Successor Company will succeed to, and be substituted for, Celanese US or Celanese, as the case may be, under the applicable indenture and the debt securities.

So long as any debt securities are outstanding, Celanese US shall file with the trustee, within 15 days after Celanese files with the SEC, copies of the annual reports and of the information, documents and other reports (or copies of such portions of any of the forgoing as the SEC may from time to time by rules and regulations prescribe) that Celanese may be required to file with the SEC pursuant to Section 13 or Section 15(d) of the Exchange Act. Celanese US shall be deemed to have complied with the previous sentence to the extent that such information, documents and reports are filed with the SEC via EDGAR, or any successor electronic delivery procedure. Delivery of such reports, information and documents to the trustee is for informational purposes only and the trustee’s receipt of such shall not constitute constructive notice of any information contained therein or determinable from information contained therein, including Celanese US’s compliance with any of its covenants under the applicable indenture (as to which the trustee is entitled to rely exclusively on officer’s certificates).

The following will be “Events of Default” with respect to debt securities of a particular series, except to the extent provided in the supplemental indenture or resolution of our board of directors pursuant to which a series of debt securities is issued:

The applicable indenture shall cease to be of further effect with respect to a series of debt securities when either:

In each case, Celanese US will also pay all other sums payable by it under the applicable indenture with respect to the securities of such series.

The term defeasance means the discharge of some or all of Celanese US’s obligations under the applicable indenture. If Celanese US deposits with the trustee funds or government securities sufficient to make payments on any series of debt securities on the dates those payments are due and payable, then, at Celanese US’s option, either of the following will occur:

Notwithstanding the preceding, without the consent of any holder of debt securities, Celanese US, Celanese and the trustee may amend or supplement an indenture or the applicable debt securities issued thereunder: