Shares of Taiwan Semiconductor Manufacturing (NYSE: TSM) (TSM) were down 2.3%, compared to a 1.2% drop for the S&P 500 index, shortly after the market opened on Thursday.

In a filing with the U.S. Securities and Exchange Commission, Warren Buffett's Berkshire Hathaway revealed that it sold 86% of its stake in the chip stock in the fourth quarter.

The news comes as TSM has significantly outperformed the broader market year to date.

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Source Fool.com