Warren Buffett is having a pretty good day in the stock market. The top 10 U.S. stock holdings of his Berkshire Hathaway Inc. investment arm are all gaining ground in afternoon trade Monday, putting a fresh $838.7 million into Buffett's pocket, according to an analysis of data provided by FactSet. Berkshire's holdings are based on the latest filings showing what it held as of Dec. 31, 2014. The largest holding -- it owns about 463.5 million shares of Wells Fargo -- is trading up 38 cents, to produce a gain of about $176.1 million for Berkshire. The 24-cent gain in Coca-Cola , of which he owns 400 million shares, is making Berkshire $96 million, while the 90-cent rise in American Express is making his 151.6-million-share holding worth an additional $136.45 million. The 77 million shares of International Business Machines , which are trading up $2.16, are being valued $166.3 million more than they were on Friday. Berkshire's Class B shares were up 1.4% on Monday, but have lost 2.8% so far this year while the S&P 500 has gained 0.9%.
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