Company: AIZ
Filing Date: 2025-08-15
Form Type: 424B5
Source: 0001193125-25-181851
Chunk: 46

Company: ASSURANT, INC.
Filing Date: 2025-08-15
Form: 424B5
Chunk 46
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| • |     | Employee misconduct could harm us by subjecting us to significant legal liability, regulatory scrutiny and 
 reputational harm.                                                                                         |

| • |     | Applicable laws and our certificate of incorporation and by-laws may                                                
 discourage takeovers and business combinations that some stockholders might consider to be in their best interests. |

The risks and uncertainties we have described are not the only ones facing us. Additional risks and uncertainties not presently known to us or that we currently deem immaterial may also affect our business operations. Additional risk factors may be included in a prospectus supplement relating to a particular series or offering of securities. 7

USE OF PROCEEDS

We intend to use the net proceeds from the sale or resale of the securities referenced in this prospectus for (a) general corporate
purposes, which may include, among other things, working capital, contributions of capital to our insurance underwriting and other subsidiaries, capital expenditures, the repurchase of shares of common stock, the repayment of short-term borrowings
or other debt or acquisitions, or (b) any other purpose disclosed in the applicable prospectus supplement.

8

DESCRIPTION OF DEBT SECURITIES WE MAY OFFER

References to “Assurant”, the “Company”, “us”, “we” or “our” in this section mean Assurant,
Inc., and do not include the subsidiaries of Assurant, Inc. Also, in this section, references to “holders” mean those who own debt securities registered in their own names, on the books that we or the applicable trustee maintain for this
purpose, and not those who own beneficial interests in debt securities registered in street name or in debt securities issued in book-entry form through one or more depositaries. When we refer to “you” in this prospectus, we mean all
purchasers of the securities being offered by this prospectus, whether they are the holders or only indirect owners of those securities. Owners of beneficial interests in the debt securities should read the section below entitled “Legal
Ownership and Book-Entry Issuance”.

Debt Securities May Be Senior or Subordinated

We may issue senior or subordinated debt securities. Neither the senior debt securities nor the subordinated debt securities will be secured by
any of our property or assets or the property or assets of our subsidiaries. Thus, by owning a debt security, you are one of our unsecured creditors.

The senior debt securities and, in the case of senior debt securities in bearer form, any related