Company: WBS-PG
Filing Date: 2025-09-05
Form Type: 424B5
Source: 0001193125-25-197211
Chunk: 8

Company: WEBSTER FINANCIAL CORP
Filing Date: 2025-09-05
Form: 424B5
Chunk 8
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 Date | The third business day preceding the Reset Date. |

| Interest Payment Periods | Each semi-annual period from, and including, an interest payment date (or in the case of the first Interest Payment Period, the original issue date) to, but excluding, the next interest payment date (or, in the case of the final Interest Payment 
 Period, the Maturity Date or earlier redemption date).                                                                                                                                                                                                |

| Record Dates | Interest on each Note will be payable to the person in whose name such Note is registered on the 15th day immediately preceding the applicable interest payment date. |

| Day Count Convention | 360-day year consisting of twelve 30-day months. |

S-2

| No Guarantee | The Notes will not be guaranteed by any of our subsidiaries. As a result, the Notes will be structurally subordinated to the liabilities of our subsidiaries as discussed below under “Ranking; Subordination.” |

| Ranking; Subordination | The Notes offered by this prospectus supplement will be issued by us under a Subordinated Debt Indenture between Webster and U.S. Bank Trust Company, National Association, as trustee (the “Trustee”), to be dated as of the issue date 
 (the “Base Indenture”), as supplemented by a First Supplemental Indenture between Webster and the Trustee, to be dated as of the issue date (the “First Supplemental Indenture”). We refer to the Base Indenture, as supplemented        
 by the First Supplemental Indenture, as the “Indenture.” The Notes will be our unsecured, subordinated obligations and:                                                                                                                  |

| • |     | will rank junior in right of payment and upon our liquidation to all of our existing and future Senior 
 Indebtedness (as defined in the Indenture), all as described under “Description of the Notes”;         |

| • |     | will rank junior in right of payment and upon our liquidation to any of our general creditors; |

| • |     | will rank equal in right of payment and upon our liquidation with all of our existing and future indebtedness the                                                         
 terms of which provide that such indebtedness ranks equally with promissory notes, bonds, debentures and other evidences of indebtedness of types that include the Notes; |

| • |     | will rank senior in right of payment and upon our liquidation to any of our future indebtedness the terms of                                                                      
 which provide that such indebtedness ranks junior in right