Company: AIZ
Filing Date: 2025-08-15
Form Type: 424B5
Source: 0001193125-25-181851
Chunk: 11

Company: ASSURANT, INC.
Filing Date: 2025-08-15
Form: 424B5
Chunk 11
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 payments of dividends, the incurrence of indebtedness or the issuance or repurchase of securities by us. Thus, we may incur substantial additional
indebtedness in the future, which could affect our ability to make payments under the Notes.

Holders of the Notes have only limited rights of acceleration.

Holders of the Notes may accelerate payment of the principal and accrued and unpaid interest on the Notes
only upon the occurrence and continuation of an event of default. An event of default under the Notes is generally limited to payment defaults, breaches of specific covenants and specific events of bankruptcy, insolvency and reorganization relating
to us.

S-7

If an active trading market does not develop for the Notes, you may not be able to resell your Notes. There is no established trading market for the Notes. We cannot assure you that an active trading market for the Notes will develop or be sustained or that holders of the Notes will be able to sell their Notes at favorable prices or at all. Although the underwriters have indicated to us that they intend to make a market for the Notes, as permitted by applicable laws and regulations, they are not obligated to do so and may discontinue any such market-making at any time without notice. Accordingly, no assurance can be given as to the liquidity of, or trading markets for, the Notes. We do not intend to list the Notes on any securities exchange or include them on any automated quotation system. The liquidity of any market for the Notes will depend upon various factors, including:

| • |     | the number of holders of the Notes; |

| • |     | the interest of securities dealers in making a market for the Notes; |

| • |     | the overall market for investment grade securities; |

| • |     | our financial performance and prospects; and |

| • |     | the prospects for companies in our industry generally. |

In addition, the liquidity of the trading market for the Notes, and the market price quoted for the Notes, may be adversely affected by changes in the overall market for fixed income securities generally. As a result, an active trading market may not develop for the Notes. If no active trading market develops, you may not be able to resell your Notes at a price that reflects accrued and unpaid interest, if at all. S-8

USE OF PROCEEDS

The net proceeds from this offering are estimated to be approximately $296.0 million, after deducting underwriting discounts and commissions
and estimated offering expenses payable by us.