Company: AIZ
Filing Date: 2025-08-15
Form Type: 424B5
Source: 0001193125-25-181851
Chunk: 18

Company: ASSURANT, INC.
Filing Date: 2025-08-15
Form: 424B5
Chunk 18
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 and appropriate, in its discretion, the Notes, or portions of the Notes, to be redeemed. Unless the Company defaults in the payment of the redemption price, interest will cease to accrue on any Notes that have been
called for redemption at the redemption date.

The Company will not be required (i) to issue, register the transfer of or exchange
the Notes to be redeemed during a period beginning at the opening of business 15 days before the day of the mailing or electronic delivery (or other transmission in accordance with the depositary’s procedures) of a notice of redemption of the
Notes selected for redemption and ending at the close of business on the day of such mailing or electronic delivery (or other transmission in accordance with the depositary’s procedures), or (ii) to register the transfer of or exchange the
Notes so selected for redemption in whole or in part, except the unredeemed portion of such Notes being redeemed in part.

Trustee

U.S. Bank Trust Company, National Association will act as the trustee, security registrar and paying agent for the Notes under the senior notes
indenture.

We maintain customary banking relationships with U.S. Bank Trust Company, National Association, U.S. Bank National Association
and certain of their respective affiliates.

S-13

Applicable Law The Notes will be, and the senior notes indenture is, governed by and construed in accordance with the laws of the State of New York. Additional Terms For additional important information about the Notes, see “Description of Debt Securities We May Offer” in the accompanying prospectus. That information includes:

| • |     | additional information on the terms of the Notes; and |

| • |     | general information on the senior notes indenture and the trustee. |

To the extent any information about the Notes varies between this prospectus supplement and the accompanying prospectus, you should rely on the information contained in this prospectus supplement. S-14

MATERIAL U.S. FEDERAL INCOME TAX CONSEQUENCES The following is a discussion of material U.S. federal income tax consequences of ownership and disposition of the Notes but does not purport to be a complete analysis of all potential tax considerations. This discussion applies only to Notes that are:

| • |     | purchased by those initial holders who purchase the Notes at the “issue price,” which will equal the                                                                                                                                         
 first price at which a substantial amount of the Notes is sold for money to the public (not including bond houses, brokers or similar persons or organizations acting in the capacity of under