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Warren Buffett Broke One of His Most Important Investing Rules, and It's Cost Berkshire Hathaway $16 Billion (and Counting)

Berkshire Hathaway lost nearly $16 billion by quickly selling its Taiwan Semiconductor stake, breaking Buffett's usual long-term investing rule amid geopolitical concerns.

Summary by The Motley Fool
Key PointsThe now-retired Warren Buffett oversaw a nearly 6,100,000% cumulative gain in Berkshire Hathaway's Class A shares (BRK.A) under his leadership.Buffett's unwritten investing rules were the catalyst that fueled Berkshire Hathaway's ascendance to a trillion-dollar market cap.However, a short-term trade in an industry-leading company that's at the forefront of the artificial intelligence revolution has turned into an expensive "what if?" f…

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The Motley Fool broke the news in Alexandria, United States on Friday, January 30, 2026.
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