Company: AIZ
Filing Date: 2025-08-15
Form Type: 424B5
Source: 0001193125-25-181851
Chunk: 5

Company: ASSURANT, INC.
Filing Date: 2025-08-15
Form: 424B5
Chunk 5
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 growth by funding investments and through acquisitions, to pay dividends and to repurchase shares. We target new businesses and capabilities, organically and through acquisitions, that complement or
accelerate our strategy. Our approach to mergers, acquisitions and other growth opportunities reflects our strategic and disciplined approach to capital management.

Investing in talent. Our employees play a critical role in contributing to our success and supporting our business strategy. We believe
in fostering an inclusive culture to drive sustained profitable growth through innovation. We are focused on strategically attracting, developing, retaining and motivating our talent, as we prioritize programs and initiatives aimed at investing in
their growth.

Corporate Information

Our principal executive offices are located at 260 Interstate North Circle SE, Atlanta, Georgia 30339. Our telephone number is (770) 763-1000. Our website is www.assurant.com. We make our periodic reports and other information filed or furnished to the SEC available, free of charge, through our website, as soon as reasonably practicable after
those reports and other information are electronically filed with or furnished to the SEC. Except as specifically noted, information on or accessible through our website is not incorporated by reference into this prospectus supplement and the
accompanying prospectus and does not constitute a part of this prospectus supplement and the accompanying prospectus.

S-2

The Offering

| Issuer | Assurant, Inc. |

| Notes Offered | $300.0 million aggregate principal amount of 5.550% senior notes due 2036. |

| Interest Rate | The Notes will bear interest at the rate of 5.550% per year. |

| Ranking | The Notes will be senior unsecured obligations of Assurant, Inc. 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 of our existing 
 and future subordinated indebtedness.                                                                                                                                                                                                               |

| As of June 30, 2025, we had approximately $1.4 billion of outstanding senior indebtedness. See “Capitalization” for further information. |

| Additional Notes | We may, without the consent of the holders of the Notes, issue additional notes having the same ranking and the same interest rate, maturity and other terms as the Notes offered by this prospectus supplement. Any such additional notes will be 
 part of the series having the same terms as the Notes; provided, however, that if such additional notes are not fungible with the