Company: AIZ
Filing Date: 2025-06-26
Form Type: 11-K
Source: 0001267238-25-000036
Chunk: 0

Company: ASSURANT, INC.
Filing Date: 2025-06-26
Form: 11-K
Chunk 0
---
### UNITED STATES

### SECURITIES AND EXCHANGE COMMISSION

#### Washington, D.C. 20549

#### FORM 11-K
(Mark One)

| x |     | Annual Report Pursuant to Section 15(d) of the Securities Exchange Act of 1934 |

#### For the fiscal year ended December 31, 2024

#### OR
| ¨ |     | Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 |

#### For the transition period from

#### to
#### .

#### Commission file number 001-31978
A. Full title of the plan and address of the plan, if different from that of the issuer named below:

#### ASSURANT 401(K) PLAN
B. Name of issuer of the securities held pursuant to the plan and the address of its principal executive office:

#### ASSURANT, INC.

#### 260 Interstate North Circle SE

#### ATLANTA, GA 30339

#### Assurant 401(k) Plan

### Financial Statements

#### and Supplemental Schedule

#### December 31, 2024

#### Contents
| Report of Independent Registered Public Accounting Firm                                        
 Financial Statements:                                                                          
 Statements of Net Assets Available for Benefits as of December 31, 2024and 2023                
 Statement of Changes in Net Assets Available for Benefits for the year ended December 31, 2024 |     |  1 
  2 
  3 |
|:-----------------------------------------------------------------------------------------------|:----|---:|
| Notes to Financial Statements                                                                  |     |  4 |
| Supplemental Schedule:                                                                         |     |    |
| Schedule H, Line 4(i) - Schedule of Assets (Held at End of Year) as of December 31, 2024       |     | 10 |
| Signatures                                                                                     |     | 11 |
| Exhibit Index                                                                                  |     | 12 |

Other schedules required by 29 CFR 2520.103-10 of the Department of Labor’s Rules and Regulations for Reporting and Disclosure under the Employee Retirement Income Security Act of 1974 have been omitted as the conditions under which they are required are not present.

<div align='center'>Amounts are presented in United States of America (“U.S.”) dollars.

Report of Independent Registered Public Accounting Firm</div>

To the Administrator and Plan Participants of Assurant 401(k) Plan

#### Opinion on the Financial Statements
We have aud