Berkshire Hathaway subsidiary becomes Mitsui's largest shareholder

Mitsui & Co., Ltd. announced on October 9, 2025, that National Indemnity Company, a Berkshire Hathaway subsidiary, has become its largest shareholder. This follows an initial disclosure on September 22, 2025, regarding National Indemnity becoming a major shareholder. The change in status was confirmed after Mitsui received updated information on the number of shares held by National Indemnity as of September 30, 2025.

As of March 10, 2025, National Indemnity held 2,854,014 voting rights (285,401,400 shares), representing 9.68% of Mitsui's total shareholder voting rights. Following the update, as of September 30, 2025, National Indemnity now holds 2,920,449 voting rights (292,044,900 shares), increasing its stake to 10.12% of the total shareholder voting rights. Mitsui noted that the reported shareholdings are based on submissions and communications from the shareholder.