Company: WBS-PG
Filing Date: 2025-09-05
Form Type: 424B5
Source: 0001193125-25-197211
Chunk: 27

Company: WEBSTER FINANCIAL CORP
Filing Date: 2025-09-05
Form: 424B5
Chunk 27
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 rate per annum equal to
the U.S. Treasury Rate for a five-year maturity as of date that is three business days prior to the Reset Date (the “Reset Determination Date”) plus 212.5 basis points, payable semi-annually in arrears on each interest payment date. The
first interest payment date for the Subsequent Fixed Rate Period will be March 11, 2031. Notwithstanding the foregoing, if the interest rate during the Subsequent Fixed Rate Period would be less than zero, the interest rate during the
Subsequent Fixed Rate Period shall be deemed to be zero.

The interest rate applicable during the Subsequent Fixed Rate Period will be
determined by the calculation agent on the Reset Determination Date.

S-16

For the Subsequent Fixed Rate Period, the “U.S. Treasury Rate” will be determined by the calculation agent on the Reset Determination Date in the following manner:

| (1) | the average of the yields on actively traded U.S. treasury securities adjusted to constant maturities, for                                                                                                                                            
 five-year maturities, for the five business days immediately preceding the Reset Determination Date and appearing (or, if fewer than five business days so appear on the Reset Determination Date, for such number of business days appearing) in the 
 most recently published H.15 Daily Update under the caption H.15 TCM; or                                                                                                                                                                              |

| (2) | if there are no such published yields on actively traded U.S. treasury securities adjusted to constant                                                                                                                                                                                                                                                                                                           
 maturities, for five-year maturities, then the “U.S. Treasury Rate” will be determined by interpolation on a straight-line basis (using the actual number of days) between the average of the yields on actively traded U.S. treasury nominal/non-inflation-indexed securities adjusted to constant maturities for two series of actively traded U.S. treasury nominal/non-inflation-indexed securities, (A) one 
 maturing as close as possible to, but earlier than, the Maturity Date and (B) the other maturing as close as possible to, but later than, the Maturity Date, in each case for the five business days preceding the Reset Determination Date and                                                                                                                                                                  
 appearing (or, if fewer than five business days so appear on the Reset Determination Date, for such number of business days appearing) in the most recently published H.15 Daily Update as of 5:00 p.m., New York City time, on the Reset