Comerica (NYSE: CMA) and Fifth Third detail merger plans and Form S-4 proxy

Rhea-AI Filing Summary

Fifth Third Bancorp shared an internal message from its Head of Regional Banking describing how the planned acquisition and integration of Comerica Incorporated fits into Fifth Third’s long-term growth strategy. The note emphasizes past steps to strengthen capital, risk management, technology and digital capabilities, and frames the Comerica transaction as the next chapter to expand into new, fast‑growing markets and broaden services for customers while creating career opportunities for employees.

The communication also includes extensive forward‑looking statements language outlining risks that could affect the merger’s completion and expected benefits, such as regulatory approvals, integration challenges, costs, economic conditions and reputational impacts. It notes that a Form S-4 registration statement for Fifth Third shares, including the joint proxy statement/prospectus for the transaction, became effective on November 25, 2025, and urges investors and security holders of both companies to read these SEC materials carefully before making any voting or investment decisions.

Insights

Bank M&A and regulatory disclosure analyst

Fifth Third highlights strategic rationale and risks for its Comerica merger.

The communication positions the Comerica acquisition as a continuation of Fifth Third’s growth strategy, following prior organic initiatives and deals such as MB Financial. It stresses that past efforts in capital building, risk management, technology and digital investments created flexibility to pursue this transaction, and frames the combination as a way to enter new, faster‑growing markets and broaden capabilities for customers.

The detailed forward‑looking statements section underscores that the merger’s benefits are uncertain and dependent on factors like realizing cost savings and synergies, obtaining regulatory and shareholder approvals, managing integration complexity, and navigating macroeconomic and competitive conditions. It also calls out potential dilution from issuing additional Fifth Third common stock and the risk of business disruption during the transaction’s pendency.

The note confirms that a Form S‑4 registration statement for the Fifth Third shares to be issued to Comerica stockholders became effective on November 25, 2025, and that the joint proxy statement/prospectus has been mailed. Future investor focus will center on subsequent disclosures within these SEC documents and any updates on approvals, closing timing and integration progress.

Filed by: Fifth Third Bancorp

Pursuant to Rule 425 under the Securities Act of 1933

and deemed filed pursuant to Rule 14a-12

under the Securities Exchange Act of 1934

Subject Company: Comerica Incorporated

(Commission File No.: 001-10706)

Date: December 8, 2025

The following excerpt of an internal website post by Fifth Third Bancorp Executive Vice President, Head of Regional Banking Darren King was made available by Fifth Third Bancorp on December 7, 2025.

Fifth Third’s momentum opens doors for customers and careers

When I think about growth, I think about possibilities. In my eight months here, I’ve seen firsthand how Fifth Third’s resilience and discipline have positioned us to seize opportunities others can’t.

Growth is about so much more than numbers. It’s energizing. It means new business forming, new teams coming together and new career paths opening up. It means the chance to learn, to lead and to build something that matters.

I’ve seen what growth can do. At my prior firm, we grew 10 times in the 25 years I was there, much of that through acquisition. Along the way, we added clients, colleagues, products and relationships. Opportunity came with every step – and so did fun. Growth presents challenges, but it presents the best kind of challenges.

As we prepare for the acquisition and integration of Comerica, we’re also gearing up to continue our legacy of growth and innovation.

We have earned this moment.

From the financial crisis and through the transformative years that followed, we did the hard work; we made the tough choices. We sharpened our focus on regulatory compliance, enhanced operational efficiencies, advanced technology and invested in digital. We managed credit, exited certain businesses and reduced risk-weighted assets. We built capital and created flexibility for how we invest it on behalf of our shareholders. We narrowed priorities and chose where we could become best in class.

Those decisions not only set us apart, but they also set the foundation for everything that followed – organic growth like Newline and our Southeast Retail expansion, consistent industry accolades, reputational strength and acquisitions such as MB Financial.

The Comerica transaction represents the next chapter in this story of growth and innovation, and it’s a chapter we’ll write together. It will expand our presence in new and fast-growing markets, broaden our capabilities and create more ways to serve customers. All that means career opportunities for our colleagues – those here now and those yet to come.

Let’s make sure the acquisition is a success. It starts by retaining and deepening existing relationships, and onboarding new relationships with care, commitment and excellence. And, if you’re not in a direct customer-facing role, it means supporting those who are – because everyone contributes to the experience. The clients we serve are the reason we’re in business, and we can never forget that.

Growth equals opportunity. It’s our chance to think bigger, act boldly and shape what’s next for Fifth Third.

Bring it on!

Darren King

Executive Vice President

Head of Regional Banking

FORWARD-LOOKING STATEMENTS

This communication contains statements that constitute “forward-looking statements” within the meaning of, and subject to the protections of, Section 27A of the Securities Act, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended, and the safe harbor provisions of the U.S. Private Securities Litigation Reform Act of 1995. Forward-looking statements can be identified by words such as “achieve,” “anticipate,” “assume,” “believe,” “could,” “deliver,” “drive,” “enhance,” “estimate,” “expect,” “focus,” “future,” “goal,” “grow,” “guidance,” “intend,” “may,” “might,” “plan,” “position,” “potential,” “predict,” “project,” “opportunity,” “outlook,” “should,” “strategy,” “target,” “trajectory,” “trend,” “will,” “would,” and other similar words and expressions or the negative of such terms or other comparable terminology. Forward-looking statements include, but are not limited to, statements about our business strategy, goals and objectives, projected financial and operating results, including outlook for future growth, and future common share dividends, common share repurchases and other uses of capital. These statements are not historical facts, but instead represent our beliefs regarding future events, many of which, by their nature, are inherently uncertain and outside of our control.

Comerica Incorporated’s (“Comerica”) and Fifth Third Bancorp’s (“Fifth Third”) actual results and financial condition may differ materially from those indicated in these forward-looking statements. Important factors that could cause Comerica’s and Fifth Third’s actual results, financial condition and predictions to differ materially from those indicated in such forward-looking statements include, in addition to those set forth in our and Fifth Third’s filings with the U.S. Securities and Exchange Commission (the “SEC”): (1) the risk that the cost savings and synergies from the merger of Comerica with Fifth Third (the “Transaction”) may not be fully realized or may take longer than anticipated to be realized; (2) the failure of the closing conditions in the merger agreement between Comerica and Fifth Third providing for the Transaction to be satisfied, or any unexpected delay in closing the Transaction or the occurrence of any event, change or other circumstances, including the impact and timing of any government shutdown, that could delay the Transaction or could give rise to the termination of the merger agreement; (3) the outcome of any legal or regulatory proceedings or governmental inquiries or investigations that may be currently pending or later instituted against Comerica, Fifth Third or the combined company; (4) the possibility that the Transaction does not close when expected or at all because required regulatory, stockholder or other approvals and other conditions to closing are not received or satisfied on a timely basis or at all (and the risk that such approvals may result in the imposition of conditions that could adversely affect the combined company or the expected benefits of the proposed Transaction); (5) the risk that the benefits from the Transaction may not be fully realized or may take longer to realize than expected, including as a result of changes in, or problems arising from, general economic and market conditions, interest and exchange rates, monetary policy, laws and regulations and their enforcement, and the degree of competition in the geographic and business areas in which Comerica and Fifth Third operate; (6) disruption to the parties’ businesses as a result of the announcement and pendency of the Transaction; (7) the costs associated with the anticipated length of time of the pendency of the Transaction, including the restrictions contained in the definitive merger agreement on the ability of Comerica or Fifth Third to operate its business outside the ordinary course during the pendency of the Transaction; (8) risks related to management and oversight of the expanded business and operations of the combined company following the closing of the proposed Transaction; (9) the risk that the integration of each party’s operations will be materially delayed or will be more costly or difficult than expected or that the parties are otherwise unable to successfully integrate each party’s businesses into the other’s businesses; (10) the possibility that the Transaction may be more expensive to complete than anticipated, including as a result of unexpected factors or events; (11) reputational risk and potential adverse reactions of Comerica or Fifth Third customers, employees, vendors, contractors or other business partners, including those resulting from the announcement or completion of the Transaction; (12) the dilution caused by Fifth Third’s issuance of additional shares of its common stock in connection with the Transaction; (13) a material adverse change in the condition of Comerica or Fifth Third; (14) the extent to which Comerica’s or Fifth Third’s businesses perform consistent with management’s expectations; (15) Comerica’s and Fifth Third’s ability to take advantage of growth opportunities and implement targeted initiatives in the timeframe and on the terms currently expected; (16) the inability to sustain revenue and earnings growth; (17) the execution and efficacy of recent strategic investments; (18) the timing and impact of Comerica’s Direct Express transition; (19) the impact of macroeconomic factors, such as changes in general economic conditions and monetary and fiscal policy, particularly on interest rates; (20) changes in customer behavior; (21) unfavorable developments concerning credit quality; (22) declines in the businesses or industries of Comerica’s or Fifth Third’s customers; (23) the possibility that the combined company is subject to additional regulatory requirements as a result of the proposed Transaction of expansion of the combined company’s business operations following the proposed Transaction; (24) general competitive, political and market conditions and other factors that may affect future results of Comerica and Fifth Third including changes in asset quality and credit risk; (25) security risks, including cybersecurity and data privacy risks, and capital markets; (26) inflation; (27) the impact, extent and timing of technological changes; (28) capital management activities; (29) competitive product and pricing pressures; (30) the outcomes of legal and regulatory proceedings and related financial services industry matters; and (31) compliance with regulatory requirements. Any forward-looking statement made in this communication is based solely on information currently available to us and speaks only as of the date on which it is made. We undertake no obligation to publicly update any forward-looking statement, whether written or oral, that may be made from time to time, whether as a result of new information, future developments or otherwise, except to the extent required by law. These and other important factors, including those discussed under “Risk Factors” in Comerica’s Annual Report on Form 10-K for the year ended December 31, 2024 (available at: https://www.sec.gov/ix?doc=/Archives/edgar/data/0000028412/000002841225000108/cma-20241231.htm), and in Fifth Third’s Annual Report on Form 10-K for the year ended December 31, 2024 (available at: https://www.sec.gov/ix?doc=/Archives/edgar/data/0000035527/000003552725000079/fitb-20241231.htm), as well as Comerica’s and Fifth Third’s subsequent filings with the SEC, may cause actual results, performance or achievements to differ materially from those

expressed or implied by these forward-looking statements. The forward-looking statements herein are made only as of the date they were first issued, and unless otherwise required by applicable securities laws, Comerica and Fifth Third disclaim any intention or obligation to update or revise any forward-looking statements, whether as a result of new information, future events, or otherwise.

ADDITIONAL INFORMATION ABOUT THE TRANSACTION AND WHERE TO FIND IT

Fifth Third filed a registration statement on Form S-4 (File No. 333-291296) with the SEC to register the shares of Fifth Third common stock that will be issued to Comerica stockholders in connection with the proposed Transaction. The registration statement includes a joint proxy statement of Comerica and Fifth Third that also constitutes a prospectus of Fifth Third. The registration statement became effective on November 25, 2025. Fifth Third filed a prospectus on November 25, 2025, and Comerica filed a definitive proxy statement on November 25, 2025. Comerica and Fifth Third each commenced mailing of the definitive joint proxy statement/prospectus to their respective shareholders on or about November 25, 2025. INVESTORS AND SECURITY HOLDERS ARE URGED TO READ THE REGISTRATION STATEMENT ON FORM S-4 AND THE DEFINITIVE JOINT PROXY STATEMENT/PROSPECTUS, AS WELL AS ANY OTHER RELEVANT DOCUMENTS FILED WITH THE SEC IN CONNECTION WITH THE TRANSACTION OR INCORPORATED BY REFERENCE INTO THE REGISTRATION STATEMENT ON FORM S-4 AND THE DEFINITIVE JOINT PROXY STATEMENT/PROSPECTUS, BECAUSE THEY CONTAIN OR WILL CONTAIN IMPORTANT INFORMATION REGARDING COMERICA, FIFTH THIRD, THE TRANSACTION AND RELATED MATTERS.

Investors and security holders may obtain free copies of these documents and other documents filed with the SEC by Comerica or Fifth Third through the website maintained by the SEC at https://www.sec.gov or by contacting the investor relations department of Comerica or Fifth Third at:

Comerica Inc.		Fifth Third Bancorp
Comerica Bank Tower 1717 Main Street, MC 6404		38 Fountain Square Plaza MD 1090FV
Dallas, TX 75201		Cincinnati, OH 45263
Attention: Investor Relations		Attention: Investor Relations
InvestorRelations@comerica.com (833) 571-0486		IR@53.com (866) 670-0468

Before making any voting or investment decision, investors and security holders of Comerica and Fifth Third are urged to read carefully the entire registration statement and definitive joint proxy statement/prospectus, including any amendments thereto when they become available, because they contain or will contain important information about the proposed Transaction. Free copies of these documents may be obtained as described above.

PARTICIPANTS IN THE SOLICITATION

Comerica, Fifth Third and certain of their respective directors and executive officers may be deemed to be participants in the solicitation of proxies from the stockholders of Comerica and shareholders of Fifth Third in connection with the Transaction under the rules of the SEC. Information regarding the directors and executive officers of each of Comerica and Fifth Third is set forth in (i) Comerica’s definitive proxy statement for its 2025 Annual Meeting of Stockholders, including under the headings entitled “Information about Nominees and Other Directors”, “Director Independence”, “Transactions with Related Persons”, “Compensation Committee Interlocks and Insider Participation”, “Compensation of Directors”, “Proposal 3 Submitted for your Vote – Non-Binding, Advisory Proposal Approving Executive Compensation”, “Pay Versus Performance”, “Pay Ratio Disclosure” and “Security Ownership of Management”, which was filed with the SEC on March 17, 2025 and is available at https://www.sec.gov/ix?doc=/Archives/edgar/data/0000028412/000002841225000135/cma-20250313.htm, and (ii) Fifth Third’s definitive proxy statement for its 2025 Annual Meeting of Stockholders, including under the headings entitled “Board of Directors Compensation”, “Compensation Discussion and Analysis”, “Human Capital and Compensation Committee Report”, “Compensation of Named Executive Officers”, “CEO Pay Ratio”, “Pay vs Performance”, “Company Proposal No. 2: Advisory Vote on Compensation of Named Executive Officers (Item 3 on Proxy Card)” and “Compensation Committee Interlocks and Insider Participation”, which was filed with the SEC on March 4, 2025 and is available at https://www.sec.gov/ix?doc=/Archives/edgar/data/0000035527/000119312525045653/d901598ddef14a.htm. To the extent holdings of each of Comerica’s or Fifth Third’s securities by its directors or executive officers have changed since the amounts set forth in Comerica’s or Fifth Third’s definitive proxy statement for its 2025 Annual Meeting of Stockholders, such changes have been or will be reflected on Statements of Change in Ownership on Form 4 filed with the SEC, which are available at https://www.sec.gov/edgar/browse/?CIK=35527&owner=exclude, and at https://www.sec.gov/edgar/browse/?CIK=28412&owner=exclude.

Other information regarding the participants in the proxy solicitation and a description of their direct and indirect interests, by security holdings or otherwise, are contained in the definitive joint proxy statement/prospectus and other relevant materials to be filed with the SEC when they become available. You may obtain free copies of these documents through the website maintained by the SEC at https://www.sec.gov.

NO OFFER OR SOLICITATION

This communication does not constitute an offer to sell or the solicitation of an offer to buy any securities or a solicitation of any vote or approval, nor shall there be any sale of securities in any jurisdiction in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such jurisdiction. No offer of securities shall be made except by means of a prospectus meeting the requirements of Section 10 of the Securities Act of 1933, as amended.

FAQ

What transaction between Comerica (CMA) and Fifth Third is described here?

The content discusses the proposed merger of Comerica Incorporated with Fifth Third Bancorp. Fifth Third describes the Comerica transaction as the next chapter in its growth and innovation strategy and refers to it as a merger in which Comerica will combine with Fifth Third.

How does Fifth Third describe the strategic rationale for acquiring Comerica (CMA)?

Fifth Third presents the Comerica acquisition as building on years of sharpening regulatory compliance, improving efficiency, advancing technology and exiting higher‑risk activities. It states that the transaction will expand its presence in new and fast‑growing markets, broaden capabilities and create more ways to serve customers, while also opening career opportunities for colleagues at both companies.

What regulatory filings have been made for the Comerica–Fifth Third merger?

Fifth Third filed a registration statement on Form S‑4 (File No. 333‑291296) with the SEC to register the Fifth Third common stock to be issued to Comerica stockholders. The registration statement, which includes a joint proxy statement/prospectus for both companies, became effective on November 25, 2025. Fifth Third filed a prospectus and Comerica filed a definitive proxy statement on the same date.

What risks and uncertainties around the Comerica–Fifth Third transaction are highlighted?

The forward‑looking statements section lists numerous risks, including that cost savings and synergies may not be fully realized, required regulatory and shareholder approvals or other closing conditions may not be obtained, integration could be delayed or more costly than expected, the transaction may be more expensive to complete, customers or employees may react adversely, there could be dilution from issuing additional Fifth Third shares, and broader economic, competitive, credit quality and regulatory factors could affect results.

What documents should Comerica (CMA) and Fifth Third investors read before voting on the merger?

Investors and security holders of both Comerica and Fifth Third are urged to read the Form S‑4 registration statement and the definitive joint proxy statement/prospectus, including any amendments and documents incorporated by reference. These materials, filed with the SEC and available at www.sec.gov or from each company’s investor relations department, contain important information about the companies, the transaction and related matters.

Does this communication constitute an offer to sell securities of Comerica or Fifth Third?

No. The text explicitly states that this communication does not constitute an offer to sell or the solicitation of an offer to buy any securities, nor a solicitation of any vote or approval, and that no offer of securities shall be made except by means of a prospectus that meets the requirements of Section 10 of the Securities Act of 1933, as amended.