Company: AIZ
Filing Date: 2025-08-15
Form Type: 424B5
Source: 0001193125-25-181851
Chunk: 0

Company: ASSURANT, INC.
Filing Date: 2025-08-15
Form: 424B5
Chunk 0
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Filed Pursuant to Rule 424(b)(5)
Registration No. 333-276645 Prospectus Supplement (to Prospectus dated January 22, 2024) Assurant, Inc. $300,000,000 5.550% Senior Notes due 2036 Assurant, Inc. is offering $300,000,000 principal amount of 5.550% senior notes due 2036 (the “Notes”). We will pay interest on the Notes semi-annually on February 15 and August 15 of each year, beginning on February 15, 2026. The Notes will mature on February 15, 2036. We may redeem the Notes, in whole or in part, at any time and from time to time at the applicable redemption price described in “Description of the Notes—Optional Redemption.” The Notes will be our senior unsecured obligations and will rank equally in right of payment with all of our other senior unsecured indebtedness from time to time outstanding, and senior in right of payment to all existing and future subordinated indebtedness. The Notes will be issued in minimum denominations of $2,000 and integral multiples of $1,000 in excess thereof. We intend to use the net proceeds from this offering to redeem all of the $175.0 million outstanding aggregate principal amount of our 6.10% Senior Notes due 2026 (the “2026 Notes”), to pay related premiums, fees and expenses and for general corporate purposes. See “Use of Proceeds.” See “ Risk Factors” beginning on page S-7for a discussion of certain risks that you should consider in connection with an investment in the Notes, as well as the risks set forth in our other filings with the Securities and Exchange Commission that are incorporated by reference in this prospectus supplement and the accompanying prospectus.

|                                              |     | Per Note |        |   |     | Total |             |
|:---------------------------------------------|:----|:---------|-------:|:--|:----|:------|------------:|
| Public offering price(1)                     |     |          | 99.678 | % |     | $     | 299,034,000 |
| Underwriting discount                        |     |          |  0.650 | % |     | $     |   1,950,000 |
| Proceeds to Assurant, Inc. (before expenses) |     |          | 99.028 | % |     | $