Company: AIZ
Filing Date: 2025-08-15
Form Type: 424B5
Source: 0001193125-25-181851
Chunk: 3

Company: ASSURANT, INC.
Filing Date: 2025-08-15
Form: 424B5
Chunk 3
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 or furnished to the SEC available, free of charge, through our website, as soon as reasonably practicable after those reports and other information are electronically filed with or furnished to the SEC. Except as specifically noted, information on or accessible through our website and the websites of our operating companies is not incorporated by reference into this prospectus supplement and the accompanying prospectus and does not constitute a part of this prospectus supplement and the accompanying prospectus. S-ii

SUMMARY

This summary contains selected information about us and this offering. Because this is a summary, it may not contain all the information that may be important to you in making your investment decision. You should read this entire prospectus supplement and the accompanying prospectus carefully, including, but not limited to, the information set forth under “Risk Factors” as well as our consolidated financial statements and the schedules and related notes and Management’s Discussion and Analysis of Financial Condition and Results of Operations included in our Annual Report on Form 10-Kfor the year ended December 31, 2024, which is incorporated by reference herein, and the other information incorporated by reference into this prospectus supplement and the accompanying prospectus.

The Company

Assurant is a
premier global protection company that partners with the world’s leading brands to safeguard and service connected devices, homes and automobiles. We leverage data-driven technology solutions to provide exceptional customer experiences. We
operate in North America, Latin America, Europe and Asia Pacific through two operating segments: Global Lifestyle and Global Housing. Through our Global Lifestyle segment, we provide mobile device solutions, extended service contracts and related
services for consumer electronics and appliances, and credit and other insurance products (referred to as “Connected Living”); and vehicle protection services, commercial equipment services and other related services (referred to as
“Global Automotive”). Through our Global Housing segment, we provide lender-placed homeowners, manufactured housing and flood insurance, as well as voluntary manufactured housing, condominium and homeowners insurance (referred to as
“Homeowners”); and renters insurance and other products (referred to as “Renters and Other”).

Our Competitive Strengths

Our financial strength and capabilities across our businesses create competitive advantages that we believe allow us to
support our clients, deliver a superior experience for their customers and drive sustainable profitable growth over the long term.

Our financial strength and business model. We believe we have a strong balance sheet and operating cash flows. As of June 30, 2025, we had $35.5 billion in total assets