巴菲特，最新操作

Group 1 - Berkshire Hathaway increased its stake in Mitsubishi Corporation from 9.74% to 10.23%, triggering disclosure requirements under the Financial Instruments and Exchange Act [1] - Following the announcement, Mitsubishi Corporation's stock price rose nearly 3%, contributing to an overall increase in the Japanese stock market [1] - Berkshire Hathaway's total investment in the five major Japanese trading companies has reached $23.5 billion, with an average annual return of 15.3% since the initial investment [3] Group 2 - The Nikkei 225 index has shown significant growth this year, with an increase of over 7% since the beginning of the year, recently surpassing 42,800 points [4] - Japan's economy expanded faster than expected in the last quarter, with a GDP growth rate of 1.0% for Q2, prompting speculation about potential interest rate hikes by the Bank of Japan [5] - A survey indicated that nearly two-thirds of economists believe the Bank of Japan will raise its key interest rate by at least 25 basis points later this year, reflecting a shift in expectations [5][6]