Company: AIZ
Filing Date: 2025-08-15
Form Type: 424B5
Source: 0001193125-25-181851
Chunk: 50

Company: ASSURANT, INC.
Filing Date: 2025-08-15
Form: 424B5
Chunk 50
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ants); |

| • |     | Reports that we are required to file with the trustee; |

| • |     | Subordination Provisions in the subordinated debt indenture that may prohibit us from making 
 payment on those securities;                                                                 |

| • |     | Our right to release ourselves from all or some of our obligations under the debt securities and the indenture by 
 a process called Defeasance; and                                                                                  |

| • |     | Holders’ rights if we experience certain Events of Default. |

Additional Mechanics Form, Exchange and Transfer Unless we specify otherwise in the prospectus supplement, the debt securities will be issued:

| • |     | only in fully registered form; |

| • |     | without interest coupons; and |

| • |     | in denominations that are even multiples of $1,000 (Section 302 of the 2013 senior debt indenture and the 
 subordinated debt indenture, Section 3.2 of the 2004 senior debt indenture)                               |

If a debt security is issued as a registered global debt security, only the depositary — e.g., DTC, Euroclear and Clearstream, each as defined below under “Legal Ownership and Book-Entry Issuance” — will be entitled to transfer and exchange the debt security as described in this subsection, since the depositary will be the sole holder of the debt security. Those who own beneficial interests in a global security do so through participants in the depositary’s securities clearance system, and the rights of these indirect owners will be governed solely by the applicable procedures of the depositary and its participants. We describe book-entry procedures below under “Legal Ownership and Book-Entry Issuance”. 12

Holders may have their debt securities broken into more debt securities of smaller
denominations of not less than $1,000 or combined into fewer debt securities of larger denominations, as long as the total principal amount is not changed. (Section 305 of the 2013 senior debt indenture and the subordinated debt indenture,
Section 3.5 of the 2004 senior debt indenture) This is called an exchange.

Holders may exchange or transfer debt securities at the
office of the trustee. They may also replace lost, stolen or mutilated debt securities at that office. The trustee acts as our agent for registering debt securities in the names of holders and transferring debt securities. We may change this
appointment to another entity or perform this service ourselves. The entity performing