Columbia Funds Series Trust 425Business combination disclosure

Filing by Columbia Funds Series Trust pursuant to Rule 425 under the Securities Act of 1933, and deemed filed under Rule 14a-12(b) under the Securities Exchange Act of 1934.

Subject Company:

BMO Funds, Inc.

(SEC File No. 811-58433)

		115 S LaSalle St. 11th Floor Chicago, IL 60603
PRODUCT ALERT BMO Funds - Reorganizations		October 8, 2021

In a previous communication, we shared that the BMO Funds’ Board of Directors approved the planned reorganizations of several BMO Funds. As an update to that communication, we wanted to inform you that shareholder proxy statements for each reorganization were filed in early October 2021 and are expected to be mailed by mid-October. Shareholders of each “Merging Fund” will receive a combined proxy statement/prospectus and a proxy card. The communication will include additional information about the shareholder meeting, the plan of reorganization and the new investment advisory or subadvisory agreements applicable with respect to certain Funds.

For your reference, the substance of the initial communication is included below, along with details regarding the “Merging Funds” and “Acquiring Funds” relating to CUSIPS, tickers and expense ratio caps.

In connection with the decision to exit the asset management business in the United States, BMO Asset Management Corp. (“BAMC”) recommended that the BMO Funds Board approve the fund reorganizations detailed at the end of this communication. On August 11, 2021, after a thoughtful review and analysis, the BMO Funds’ Board of Directors approved the planned reorganizations, which are subject to shareholder approval.

A supplement to each Fund’s prospectus announcing the plan of reorganization was filed on August 17, 2021. Pending shareholder approvals, the Merging Funds are scheduled to merge into their respective Acquiring Funds starting in December 2021 and completing in January 2022.

Each plan of reorganization is subject to approval by shareholders of the applicable Merging Fund. Shareholders of each Merging Fund will become shareholders of the corresponding Acquiring Fund, receiving shares of the Acquiring Fund equal in value to the shares of the Merging Fund held by the shareholders prior to the applicable reorganization. The reorganizations themselves are not expected to result in the recognition of gain or loss by the Merging Fund or its shareholders for federal tax purposes. Shareholders of the Merging Funds and the Acquiring Funds will not bear the costs of the reorganizations. Certain Merging Funds will reposition their portfolios prior to the reorganizations. Any resulting net capital gains are likely to be distributed to shareholders in early December.

A joint meeting of shareholders of the Merging Funds is expected to take place during the fourth quarter of 2021 at which they will be asked to consider and vote on a plan with respect to their Merging Fund. Shareholders of the Disciplined Equity Funds will also be asked to consider and vote on a new investment advisory agreement, and shareholders of the Pyrford Fund and LGM Fund will be asked to consider and vote on new subadvisory agreements.

FOR FINANCIAL PROFESSIONAL USE ONLY

		115 S LaSalle St. 11th Floor Chicago, IL 60603
PRODUCT ALERT BMO Funds - Reorganizations		October 8, 2021

Pending shareholder approval, Merging Fund shareholders will receive shares of the corresponding Acquiring Fund as set forth in the table below:

Equity Fund Reorganizations    

FOR FINANCIAL PROFESSIONAL USE ONLY

		115 S LaSalle St. 11th Floor Chicago, IL 60603
PRODUCT ALERT BMO Funds - Reorganizations		October 8, 2021

Fixed Income and Target Risk Fund Reorganizations

FOR FINANCIAL PROFESSIONAL USE ONLY

		115 S LaSalle St. 11th Floor Chicago, IL 60603
PRODUCT ALERT BMO Funds - Reorganizations		October 8, 2021

All investments involve risk, including the possible loss of principal.

BMO Global Asset Management is the brand name for various affiliated entities of BMO Financial Group that provide investment management, retirement, and trust and custody services. Certain of the products and services offered under the brand name BMO Global Asset Management are designed specifically for various categories of investors in a number of different countries and regions and may not be available to all investors. Products and services are only offered to such investors in those countries and regions in accordance with applicable laws and regulations. BMO Financial Group is a service mark of Bank of Montreal (BMO).

Investment products are: NOT A DEPOSIT – NOT FDIC INSURED - NO BANK GUARANTEE – MAY LOSE VALUE

Investors should carefully consider the investment objectives, risks, charges and expenses of the BMO Funds. This and other important information is contained in the prospectuses and/or summary prospectuses, which can be obtained by calling 1-800-236-3863. Please read carefully before investing.

BMO Asset Management Corp. is the investment adviser to the BMO Funds. BMO Funds are distributed by Foreside

Financial Services, LLC.

Important Additional Information and Where to Find It

BMO Funds, its directors and officers are deemed to be participants in the solicitation of proxies from BMO Funds’ shareholders in connection with the matters to be considered at the joint meeting of shareholders described herein. Information regarding the names of the directors and officers of BMO Funds, and their interests in BMO Funds by security holdings or otherwise, can be found in the most recent statement of additional information of BMO Funds, filed with the Securities and Exchange Commission (“SEC”) on July 6, 2021. A combined prospectus/proxy statement has been filed with the SEC in connection with the solicitation of proxies from BMO Funds’ shareholders in connection with each Plan of

Reorganization and, as applicable, the new investment advisory and subadvisory agreements. SHAREHOLDERS ARE

STRONGLY ENCOURAGED TO READ SUCH PROSPECTUS/PROXY STATEMENT CAREFULLY AND IN ITS ENTIRETY, AS IT CONTAINS IMPORTANT INFORMATION. Shareholders will be able to obtain copies of the combined prospectus/proxy statement and other documents filed by BMO Funds with the SEC for no charge at the SEC’s website at www.sec.gov. Copies will also be available at no charge by contacting BMO Funds’ proxy solicitor toll free at 888-991-1289. C11:13637206

FOR FINANCIAL PROFESSIONAL USE ONLY

COLUMBIA THREADNEEDLE INVESTMENTS — BMO FUND MERGERS AND PROXY UPDATE

As a follow-up to our August 17, 2021 bulletin regarding our acquisition of Bank of Montreal’s (BMO) EMEA asset management business and the proposed reorganization of BMO’s U.S. mutual funds into existing and newly formed Columbia funds, we are writing to inform you that the final filings for the proposed mergers have been made with the SEC and that the related proxy mailing and voting process has begun. As a reminder, the merging BMO funds and their acquiring Columbia funds are listed in the table below, grouped by anticipated merger closing date (assuming shareholder approval).

Key proxy dates

Key dates for the proxy process are as follows:

  As always, your relationship manager or dedicated service team can assist with any questions regarding this information.

For institutional and broker/dealer use only. This material has not been filed with FINRA and may not be shown, quoted to, or used with members of the general public.

^©2021 Columbia Management Investment Advisers, LLC. All rights reserved.

Columbia Management Investment Distributors, Inc.

290 Franklin Street, Boston, MA 02210

columbiathreadneedle.com/us

October 8, 2021

Please have your clients read and consider investment objectives, risks, charges and expenses carefully before investing. Remind them to contact you or visit columbiathreadneedleus.com for a prospectus or summary prospectus, which contains this and other important information about the fund. The foregoing is not an offer to sell, nor a solicitation of an offer to buy, shares of any fund, nor is it a solicitation of any proxy.

Investors should also review the Combined Proxy Statement/Prospectus relating to their fund for more information about the reorganizations and acquiring funds.

Investment products are not federally or FDIC-insured, are not deposits or obligations of, or guaranteed by any financial institution and involve investment risks, including possible loss of principal and fluctuation in value.

Columbia Threadneedle Investments (Columbia Threadneedle) is the global brand name of the Columbia and Threadneedle group of companies.

Columbia funds are distributed by Columbia Management Investment Distributors, Inc., member FINRA. Columbia funds are managed by Columbia Management Investment Advisers, LLC.

The foregoing is not an offer to sell, nor a solicitation of an offer to buy, shares of any acquiring fund, nor is it a solicitation of any proxy. Because each acquired fund will reorganize into the corresponding acquiring fund on its reorganization date, you should consider the appropriateness of making a new or subsequent investment in the acquired fund prior to its reorganization date. You should consider the investment objectives, risks, charges and expenses of the acquiring fund and/or acquired fund carefully before investing. For information regarding an acquiring fund, the proposed mergers or other proposals, or to receive a free copy of the applicable combined proxy statement/prospectus, please call the BMO Funds’ proxy solicitor at 888-991-1289.

For institutional and broker/dealer use only. This material has not been filed with FINRA and may not be shown, quoted to, or used with members of the general public.