Company: CMA
Filing Date: 2025-10-09
Form Type: 425
Source: 0001193125-25-235941
Chunk: 0

Company: COMERICA INC
Filing Date: 2025-10-09
Form: 425
Chunk 0
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UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): October 9, 2025 (October 5, 2025) COMERICA INCORPORATED (Exact name of registrant as specified in its charter)

| Delaware                     |     | 1-10706     |     | 38-1998421            |
| (State or other Jurisdiction 
 of Incorporation)            |     | -Commission 
 File Number |     | -IRS Employer         
 Identification Number |

Comerica Bank Tower 1717 Main Street, MC 6404 Dallas, Texas 75201 (Address of principal executive offices) (zip code) (833) 571-0486 (Registrant’s telephone number, including area code) Check the appropriate box below if the Form 8-Kfiling is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

| ☒ | Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) |

| ☐ | Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 
 CFR 240.14a-12)                                                        |

| ☐ | Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) |

| ☐ | Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c)) |

Securities registered pursuant to Section 12(b) of the Act:

| Title of each class                                                                                                                             |     | Trading   
 Symbol(s) |     | Name of each exchange   
 on which registered     |
| Common Stock, $5 par value                                                                                                                      |     | CMA       |     | New York Stock Exchange |
| Depositary Shares, each representing a 1/40th interest in a share of 6.875% Fixed-Rate Reset Non-Cumulative Perpetual Preferred Stock, Series B |     | CMA PrB   |     | New York Stock Exchange |

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (17 CFR 230.405)