Just now, Trump has once again increased tariffs on China, and this person has gone completely insane! The market needs Buffett. Waiting for Buffett's position movements to change, we usually find data opportunities in three ways! one ️⃣ Quarterly Disclosure: 13F Document ✅ Source: US Securities and Exchange Commission (SEC) - Form 13F Target: All institutional investors with assets under management exceeding $100 million (including Berkshire Hathaway) Disclosure: Holdings of US listed company stocks (excluding bonds, options, etc.) Release time: Within 45 days after the end of each quarter two ️⃣ 5% shareholding disclosure: 3D/13G documents (with strong timeliness) ✅ Source: SEC Rule 13D-G Trigger condition: Once Berkshire Hathaway holds more than 5% of the shares of a listed company Disclosure deadline: 13D: must be disclosed within 10 days 13G: Can be delayed until the end of the quarter three ️⃣ Berkshire Hathaway Quarterly Financial Report Disclose the total amount of stock investment Disclose the market value of top holdings (sometimes speculating on individual stock changes) Explanation on mergers and special transactions