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Berkshire Hathaway shares rose sharply this week and outperformed the S&P 500 year to date, while broader Wall Street declined amid fears about artificial intelligence, CNBC reported. Berkshire said Saturday that it accelerated its share repurchases in the third quarter, more than doubling buybacks, as operating and overall profits declined. CNBC's report did not specify the size of the share move or the causes of the broader selloff.