Core Viewpoint - Berkshire Hathaway has increased its stake in Japan's Mitsui & Co. to over 10%, with potential for further increases in the future [2][3]. Group 1: Stake Increase and Corporate Strategy - In February, Buffett indicated that Japanese companies agreed to "moderately" relax the 10% ownership cap [2]. - As of September 22, Berkshire's voting rights stake in Mitsui & Co. has surpassed 10%, and there is a possibility of further acquisitions [2]. - On August 28, Mitsubishi Corporation announced that Berkshire's voting rights stake increased from 9.74% to 10.23% [2]. Group 2: Investment Approach - Since 2019, Berkshire has focused on high-credit Japanese companies, utilizing low-interest yen bonds to invest in major trading firms [2]. - On April 11, Berkshire priced a total of 90 billion yen in six series of yen-denominated bonds, marking the lowest issuance scale in history [2]. Group 3: Market Performance - As of September 22, the stock prices of the five major trading companies, including Mitsui & Co. and Mitsubishi Corporation, have all seen gains [3]. - Currently, the stock prices of Japan's five major trading companies are at their highest valuation levels in 20 years [4].

Core Insights - Berkshire Hathaway has increased its stake in Japan's Mitsui & Co. to over 10% [1] - The company has been focusing on high-credit Japanese enterprises since 2019, utilizing low-interest yen bonds to acquire shares in major trading companies [1] - The stock prices of Japan's five major trading companies have risen, reaching their highest valuation levels in 20 years [2][3] Group 1 - Berkshire Hathaway's stake in Mitsui & Co. has surpassed 10%, with potential for further increases [1] - In August, Berkshire also raised its stake in Mitsubishi Corporation from 9.74% to 10.23% [1] - The initial plan was to keep holdings below 10%, but Japanese companies agreed to a "moderate" relaxation of this limit [1] Group 2 - As of September 22, 2025, the stock prices of Mitsui & Co., Mitsubishi Corporation, Sumitomo Corporation, Itochu Corporation, and Marubeni Corporation have all increased [2] - The price changes for the five major trading companies on September 22, 2025, were as follows: Mitsui & Co. up 1.34%, Mitsubishi Corporation up 0.81%, Sumitomo Corporation up 0.60%, Itochu Corporation up 0.40%, and Marubeni Corporation up 0.80% [3] - The current stock prices of these companies are at their highest valuation levels in the past 20 years [3]