Aflac Incorporated is an American insurance company that is the largest provider of supplemental insurance in the United States and a leading provider of medical and cancer insurance in Japan. Founded in 1955, the company specializes in policies that pay cash benefits directly to policyholders to help cover out-of-pocket expenses related to accidents or illnesses. Aflac operates primarily through two segments: Aflac U.S. and Aflac Japan.
Aflac Japan's alliance with Japan Post Group (part of its affiliated corporate agencies channel) has in recent periods accounted for a significant portion of Aflac Japan's total sales; the affiliated corporate agency channel, which includes Japan Post Group, Dai-ichi Life and Daido Life, generated 49.2% of Aflac Japan's new annualized premium sales in 2025.