Company: WBS-PG
Filing Date: 2025-09-05
Form Type: 424B5
Source: 0001193125-25-197211
Chunk: 68

Company: WEBSTER FINANCIAL CORP
Filing Date: 2025-09-05
Form: 424B5
Chunk 68
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1129 as it forms part of UK domestic law by virtue of the European Union (Withdrawal) Act 2018. Canada The Notes may be sold only to purchasers purchasing, or deemed to be purchasing, as principal that are accredited investors, as defined in National Instrument 45-106Prospectus Exemptions or subsection 73.3(1) of the Securities Act (Ontario), and are permitted clients, as defined in National Instrument 31-103Registration Requirements, Exemptions and Ongoing Registrant Obligations. Any resale of the Notes must be made in accordance with an exemption from, or in a transaction not subject to, the prospectus requirements of applicable securities laws. Securities legislation in certain provinces or territories of Canada may provide a purchaser with remedies for rescission or damages if this prospectus supplement and the accompanying prospectus (including any amendment hereto or thereto) contains a misrepresentation, provided that the remedies for rescission or damages are exercised by the purchaser within the time limit prescribed by the securities legislation of the purchaser’s province or territory. The purchaser should refer to any applicable provisions of the securities legislation of the purchaser’s province or territory for particulars of these rights or consult with a legal advisor. Pursuant to section 3A.3 (or, in the case of securities issued or guaranteed by the government of a non-Canadianjurisdiction, section 3A.4) of National Instrument 33-105Underwriting Conflicts (NI 33-105),the underwriters are not required to comply with the disclosure requirements of NI 33-105regarding underwriter conflicts of interest in connection with this offering. S-43

Hong Kong The Notes may not be offered or sold in Hong Kong by means of any document other than:

| • |     | in circumstances which do not constitute an offer to the public within the meaning of the Companies (Winding Up                                                                                                                              
 and Miscellaneous Provisions) Ordinance (Cap. 32 of the Laws of Hong Kong) (“Companies (Winding Up and Miscellaneous Provisions) Ordinance”) or which do not constitute an invitation to the public within the meaning of the Securities and 
 Futures Ordinance (Cap. 571 of the Laws of Hong Kong) (“Securities and Futures Ordinance”);                                                                                                                                                  |

| • |     | to “professional investors” as defined in the Securities and Futures Ordinance and any rules made 
 thereunder; or                                                                                    |

| • |     | in other circumstances which do not result in the