What is Berkshire Hathaway buying in Japan next?
Berkshire Hathaway (US) discloses its Japanese stakes under Japan’s own regime, EDINET large-shareholding reports (大量保有報告書), the side a US 13F is blind to. Japan is also the one market where a prediction is checkable almost immediately: the report is due within about five business days of crossing 5%, not the US 13F’s 45. Research, not investment advice.
Currently disclosed Japanese holdings
From Berkshire Hathaway’s latest EDINET 5% filings. Stake is the disclosed large-shareholding percentage.
| Issuer | Stake | Purpose | As of |
|---|---|---|---|
| Mitsubishi Corp (8058) | 11.1% | pure investment | 2026-05-12 |
| Mitsui & Co (8031) | 10.8% | pure investment | 2026-07-01 |
| Marubeni Corp (8002) | 10.3% | pure investment | 2026-07-01 |
| Sumitomo Corp (8053) | 9.3% | pure investment | 2025-03-17 |
| Itochu Corp (8001) | 8.5% | pure investment | 2025-03-17 |
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The full Japan board, predicted and disclosed, is on Japan. How the model works and its honest limits are on methodology. Data as of 2026-05-12. Research, not investment advice, see the disclaimer.