Company: AIZ
Filing Date: 2025-08-15
Form Type: 424B5
Source: 0001193125-25-181851
Chunk: 37

Company: ASSURANT, INC.
Filing Date: 2025-08-15
Form: 424B5
Chunk 37
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 at the time of the offering. We
may sell these securities to or through one or more underwriters, dealers or agents, or directly to purchasers, on a continued or delayed basis. We will provide the specific terms of the securities and describe the manner in which they may be
offered in supplements to this prospectus. You should read this prospectus and any supplement carefully before you invest.

Our shares of
common stock are listed on the New York Stock Exchange under the trading symbol “AIZ”. Each prospectus supplement will indicate if the securities offered thereby will be listed on any securities exchange.

This prospectus and any applicable prospectus supplement may be used in the initial sale of the securities or in resales by selling
securityholders. In addition, Assurant, Inc. or any of its affiliates may use this prospectus and the applicable prospectus supplement in a remarketing or other resale transaction involving the securities after their initial sale. These transactions
may be executed at negotiated prices that are related to market prices at the time of purchase or sale, or at other prices, as determined from time to time.

You should consider carefully the risk factorsbeginning on page 5 of this prospectus and included in our reports filed with the Securities and Exchange Commission and in any applicable prospectus supplement before purchasing any of our securities.

Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of these securities or determined whether this prospectus is truthful or complete. Any representation to the contrary is a criminal offense.

The date of this prospectus is January 22, 2024

TABLE OF CONTENTS

|                                                                                   |     | Page |     |
| About This Prospectus                                                             |     |      |  ii |
| Forward-Looking Information                                                       |     |      | iii |
| About Assurant, Inc.                                                              |     |      |   1 |
| Where You Can Find More Information                                               |     |      |   3 |
| Risk Factors                                                                      |     |      |   5 |
| Use of Proceeds                                                                   |     |      |   8 |
| Description of Debt Securities We May Offer                                       |     |      |   9 |
| Description of Common Stock We May Offer                                          |     |      |  25 |
| Description Of Preferred Stock and Depositary Shares Representing Preferred Stock 
 We May Offer                                                                      |     |      |  28 |
| Description of Warrants We May Offer                                              |     |      |  33 |
|