Tokio Marine secures $1.8 billion Berkshire Hathaway stake to fuel global expansion
CEO Masahiro Koike says the strategic partnership will facilitate international mergers and acquisitions, while Berkshire provides reinsurance support for high-risk segments.

Tokio Marine Holdings has entered a strategic partnership with Berkshire Hathaway to accelerate its international growth and diversify its revenue streams. Under the agreement, Berkshire Hathaway will acquire a 2.5% stake in the Japanese insurer for $1.8 billion (Y287.4 billion), with the potential for its holding to increase to a maximum of 10%. The deal grants Berkshire an exclusive five-year window to assist Tokio Marine with insurance mergers and acquisitions outside Japan.
Chief Executive Masahiro Koike described the tie-up as a pivotal step in broadening the company’s business mix. Speaking to the Financial Times, Koike noted that collaborating with Berkshire on overseas insurance deals would allow Tokio Marine to preserve financial capacity for its newer non-insurance activities. The partnership effectively opens options the insurer could not pursue independently, enabling faster expansion while maintaining capital for its solutions unit.
The non-insurance solutions unit, launched last year following the acquisition of engineering firm ID&E, is a core component of this diversification strategy. Koike has set a target for earnings from this unit to rise from Y10 billion to Y100 billion by 2035. This ambition is part of a broader ten-year plan to grow group adjusted net income from Y881 billion to Y1.7 trillion, while aiming to rank among the world’s five largest insurers.
A primary driver for the deal is the need to reduce reliance on the United States market, which currently accounts for approximately 90% of Tokio Marine’s international profits and nearly two-thirds of total group profits. Koike highlighted that this concentration heightened the urgency to diversify regionally, particularly given the prevailing geopolitical landscape. The agreement supports larger acquisitions that combine Berkshire’s balance sheet with Tokio Marine’s operating capabilities.
Additionally, Berkshire will provide reinsurance for an undisclosed share of Tokio Marine’s overall risk. This backing is designed to help the insurer manage volatility and increase exposure more quickly in higher-risk segments, such as natural catastrophe property cover and cyber insurance. Established in 1879 as Japan’s first insurer, Tokio Marine competes domestically with firms such as Sompo and MS&AD Insurance.


