Warren Buffett's Berkshire Hathaway has acquired a 2.5% stake in Tokio Marine, paying ¥287.4bn ($1.8bn) for the stake and agreeing to reinsure a portion of the Japanese insurer's risk. The deal marks Berkshire's first equity investment in Japan's insurance sector, expanding beyond its previous focus on trading houses. The transaction includes a five-year exclusivity period and caps Berkshire's potential stake at 10%. The partnership aims to pursue a small number of large, strategic acquisitions leveraging Berkshire's capital with Tokio Marine's operational expertise.

Berkshire's insurance operations face pressure from an influx of private capital that has eroded returns, prompting several units to pull back from underwriting new policies. Berkshire has plenty of capital but faces constraints integrating and operating a growing roster of global insurance companies. Tokio Marine has completed five large-scale international deals worth roughly $19bn since 2008, giving it the post-merger integration capabilities Berkshire lacks. "M&A is key," said Kenichi Sakakibara, head of corporate planning at Tokio Marine. Ajit Jain, Berkshire's insurance chief, led negotiations with CEO Masahiro Koike.

The investment resembles Berkshire's 2015 deal with Insurance Australia Group, extended to 2029. Berkshire's existing Japanese equity positions in trading houses have delivered strong returns, with shares in Mitsubishi Corporation, Itochu and others doubling or tripling since 2020, generating $862mn in dividends in 2025. Analysts suggest the trading houses offer limited upside now, making Tokio Marine an attractive fresh destination for Berkshire's capital.