Company: CMA
Filing Date: 2025-03-17
Form Type: DEFA14A
Source: 0000028412-25-000136
Chunk: 0

Company: COMERICA INC
Filing Date: 2025-03-17
Form: DEFA14A
Chunk 0
---
### UNITED STATES

### SECURITIES AND EXCHANGE COMMISSION

#### WASHINGTON, D.C. 20549

#### SCHEDULE 14A INFORMATION
<div align='center'>Proxy Statement Pursuant to Section 14(a) of the
Securities Exchange Act of 1934</div>

Filed by the Registrant

#### ☒

Filed by a Party other than the Registrant

#### ☐

| Check the appropriate box: |     |                                                                                 |
| ☐                          |     | Preliminary Proxy Statement                                                     |
| ☐                          |     | Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) |
| ☐                          |     | Definitive Proxy Statement                                                      |
| ☒                          |     | Definitive Additional Materials                                                 |
| ☐                          |     | Soliciting Material under §240.14a-12                                           |

#### Comerica Incorporated
<div align='center'>(Name of Registrant as Specified In Its Charter)

(Name of Person(s) Filing Proxy Statement, if other than the Registrant)</div>

| Payment of Filing Fee (Check all boxes that apply): |     |                                                                                                     |
| ☒                                                   |     | No fee required                                                                                     |
| ☐                                                   |     | Fee paid previously with preliminary materials                                                      |
| ☐                                                   |     | Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11 |