Company: AIZ
Filing Date: 2025-08-15
Form Type: 424B5
Source: 0001193125-25-181851
Chunk: 44

Company: ASSURANT, INC.
Filing Date: 2025-08-15
Form: 424B5
Chunk 44
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 where the offer or sale is not permitted.

4

RISK FACTORS Investing in our securities involves significant risks. Before making an investment decision, you should carefully consider the risks and other information we include or incorporate by reference in this prospectus. These risks are discussed more fully in the section titled “Risk Factors” in our most recent Annual Report on Form 10-Kfiled with the SEC, in each case as those risk factors are amended or supplemented by subsequent Quarterly Reports on Form 10-Qor Current Reports on Form 8-K.These risks and uncertainties include, but are not limited to, the following: Business, Strategic and Operational Risks

| • |     | Our revenues and profits may decline if we are unable to maintain relationships with significant clients,                                               
 distributors and other parties, or renew contracts with them on favorable terms, or if those parties face financial, reputational or regulatory issues. |

| • |     | Significant competitive pressures, changes in customer preferences and disruption could adversely affect our 
 results of operations.                                                                                       |

| • |     | The success of our business depends on the execution of our strategy, including through the continuing service of 
 key executives, senior leaders, highly-skilled personnel and a high-performing workforce.                         |

| • |     | We may be unable to find suitable acquisition candidates at attractive prices, integrate acquired businesses or                                                                                     
 divest of non-strategic businesses effectively or identify new areas for organic growth, which could have a material adverse effect on our business, financial condition and results of operations. |

| • |     | Our inability to successfully recover should we experience a business continuity event could have a material 
 adverse effect on our business, financial condition and results of operations.                               |

| • |     | Failure to successfully manage vendors and other third parties could adversely affect our business. |

| • |     | We face risks associated with our international operations. |

| • |     | Our mobile business is subject to the risk of declines in the value and availability of mobile devices in our 
 inventory, and to export compliance and other risks.                                                          |

| • |     | Sales of our products and services may decline if we are unable to develop and maintain distribution sources or 
 attract and retain sales representatives and executives with key client relationships.                          |

| • |     | We face risks associated with joint ventures, franchises and investments in which we share ownership or 
 management with third parties.                                                                          |

| • |     | Catastrophe and non-catastrophe losses, including as