Warren Buffett's Berkshire Hathaway disclosed in a regulatory filing that it sold off its entire stake in Exxon Mobil , while adding a new 24.7 million share stake in Deere & Co. during the fourth quarter. Berkshire also increased its stake in IBM Corp. to 76,971,817 shares as of Dec. 31 from 70,478,012 shares on Sept. 30, according 13H filings. The filings also indicated Berkshire held no shares of Exxon on Dec. 31, after holding 41,129,643 shares on Sept. 30. Separately, Berkshire increased its stake in MasterCard Inc. to 5.4 million shares from 4.7 million shares, boosted its holdings of Visa Inc. to 2.5 million shares from 2.15 million shares and cut its holdings of National Oilwell Varco to 5.26 million shares from 6.4 million shares. He kept his share holdings of Wells Fargo -- his largest holding -- at 463.5 million, Coca-Cola at 400 million, American Express at 151.6 million and Goldman Sachs at 12.6 million.
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