Berkshire Hathaway, acting through its wholly owned insurer National Indemnity Company, disclosed on Thursday that it has lifted its stake in Mitsubishi Corp. to 10.23%, up from 9.74% in March. The purchase pushes Warren Buffett’s investment vehicle past the 10% ownership threshold that triggers additional regulatory disclosures in Japan. Mitsui & Co. said Berkshire has also increased its holding, though it did not specify the new percentage. Berkshire’s previous filing showed a 9.82% interest in the trading house. The latest purchases mark the first time Berkshire has crossed double-digit ownership in any of the five Japanese sogo shosha it first backed in 2020 and last added to in March. The announcement sparked a sector-wide advance in Tokyo. Mitsubishi shares rose as much as 2.9% before ending 1.9% higher, while Mitsui gained 1.2%. Peers Itochu, Marubeni and Sumitomo added roughly 1.1%–1.2%, outpacing the Nikkei 225’s 0.7% rise. Berkshire has cited the trading houses’ diversified earnings streams and recent focus on shareholder returns as reasons for its long-term commitment. Neither Berkshire nor Mitsubishi commented beyond the mandatory filings.