Company: CMA
Filing Date: 2025-03-27
Form Type: DEFA14A
Source: 0000028412-25-000139
Chunk: 0

Company: COMERICA INC
Filing Date: 2025-03-27
Form: DEFA14A
Chunk 0
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### 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 |

#### Voting FAQs for Comerica's Employee Shareholders

#### March 27, 2025
Comerica Incorporated's 2025 Annual Shareholder meeting is scheduled to take place on Tuesday, April 29. Please see below for information on how to vote your shares:

Q: If I vote once, does that mean I've voted all of my Comerica shares?

A: Not necessarily. If you hold Comerica shares both directly and through a broker, or through more than one broker, each set of shares would need to be voted separately. For example, if you have shares in the 401(k) plan as well as shares in your Fidelity Brokerage account (i.e., acquired via the ESPP or stock awards that previously vested), you will need to vote twice - once through Computershare (for shares in the 401(k) plan) and once through Fidelity for shares in the brokerage account.

#### Q: Can I