Shares of Wells Fargo & Co. plunged $13 Thursday, after wire services reported that Warren E. Buffett had sold all his shares-a report that the bank denied.

Reuters, Dow Jones, and Bloomberg noted a filing by Berkshire Hathaway Inc. indicating that Mr. Buffett's investment vehicle, which at last report was Wells' largest shareholder with a 7.82% stake, owned no stock in the bank as of June 30.

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