Billionaire investor Warren Buffett's Berkshire Hathaway (BRK/A) added to its holdings of Wells Fargo (WFC) during the third quarter, fortifying its position as San Francisco company's biggest shareholder.

Berkshire Hathaway built up a bigger stake in Bank of New York Mellon (BK), while trimming its holdings of U.S. Bancorp (USB) and Visa (VISA) during the third quarter, according to a Wednesday regulatory filing.

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