Company: AIZ
Filing Date: 2025-08-15
Form Type: 424B5
Source: 0001193125-25-181851
Chunk: 9

Company: ASSURANT, INC.
Filing Date: 2025-08-15
Form: 424B5
Chunk 9
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 due to market, credit and liquidity risks, and 
 changes in interest rates;                                                                                    |

| • |     | an impairment in the value of our deferred tax assets; |

| • |     | the unavailability or inadequacy of reinsurance coverage and the credit risk of reinsurers, including those to 
 whom we have sold business through reinsurance;                                                                |

| • |     | the credit risk of some of our agents, third-party administrators and clients; |

| • |     | the inability of our subsidiaries to pay sufficient dividends to the holding company and limitations on our 
 ability to declare and pay dividends or repurchase shares;                                                  |

| • |     | limitations in the analytical models we use to assist in our decision-making; |

| • |     | the failure to effectively maintain and modernize our technology systems and infrastructure, or the failure to 
 integrate those of acquired businesses;                                                                        |

| • |     | breaches of our technology systems or those of third parties with whom we do business, or the failure to protect 
 the security of data in such systems, including due to cyberattacks and as a result of working remotely;         |

| • |     | the costs of complying with, or the failure to comply with, extensive laws and regulations to which we are 
 subject, including those related to privacy, data security, data protection and tax;                       |

| • |     | the impact of litigation and regulatory actions; |

| • |     | reductions or deferrals in the insurance premiums we charge; |

| • |     | changes in insurance, tax and other regulations; |

| • |     | volatility in our common stock price and trading volume; and |

| • |     | employee misconduct. |

For additional information on factors that could affect our actual results, please refer to the factors identified in the reports we file with the SEC, including the risk factors identified in our most recent Annual Report on Form 10-Kfor the year ended December 31, 2024.

S-6

RISK FACTORS

Investing in the Notes involves risks. In considering whether you should invest in the Notes, you should consider all of the information we have included or incorporated by reference in this prospectus supplement and the accompanying prospectus. In particular, you should carefully consider the risk factors described below, as well as in our Annual Report on Form 10-Kfor the year ended December 31, 2024 under “Item 1A. Risk Factors.” You should also read all other information contained in