Company: CMA
Filing Date: 2025-08-05
Form Type: 424B5
Source: 0001193125-25-173600
Chunk: 34

Company: COMERICA INC
Filing Date: 2025-08-05
Form: 424B5
Chunk 34
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 Preferred Stock as they appear on our stock register at 5:00 p.m., New York City time, on the applicable record date, which will be the 15 thcalendar day before the applicable dividend payment date, or such other record date, not exceeding 30 days before the applicable dividend payment date, as will be fixed by our board of directors or a duly authorized committee of our board of directors. See “Description of Depositary Shares—Dividends and Other Distributions.” A “reset date” means the First Reset Date and each date falling on the fifth anniversary of the preceding reset date. Reset dates, including the First Reset Date, will not be adjusted for business days. A “reset period” means the period from, and including, the First Reset Date to, but excluding, the next following reset date and thereafter each period from, and including, each reset date to, but excluding, the next following reset date. A “reset determination date” means, in respect of any reset period, the day falling three business days prior to the beginning of such reset period. A “dividend period” is the period, from and including, a dividend payment date to, but excluding, the next dividend payment date, except that the initial dividend period will commence on, and include, the original issue date of the Series B Preferred Stock and will end on and exclude the January 1, 2026 dividend payment date. Dividends payable on the Series B Preferred Stock for any dividend period will be computed on the basis of a 360-dayyear consisting of twelve 30-daymonths. For any reset period commencing on or after the First Reset Date, the five-year treasury rate with respect to any reset determination date will be:

| • |     | The average of the yields on actively traded U.S. treasury securities adjusted to constant maturity, for                                                                                                                                  
 five-year maturities, for the five business days appearing under the caption “Treasury Constant Maturities—Nominal” (or any successor caption or heading) in the most recently published statistical release designated H.15 Daily Update 
 (the “H.15”) or any successor publication which is published by the Federal Reserve as of 5:00 p.m. (Eastern Time), as determined by the calculation agent in its sole discretion.                                                        |

| • |     | If there are no such published yields on actively traded U.S. treasury securities adjusted to constant maturity (nominal/non-inflation-indexed), for five-year maturities, then the