NEW YORK (MarketWatch) -- Warren Buffett's Berkshire Hathaway Inc. BRK.A -1.07%BRK.B -0.05% bought a stake in Verizon Communications Inc. VZ +1.65% , according to the company's 13F filing for 2014's first quarter, published late Thursday. Berkshire owned 11 million shares in the telecom at the end of March, versus none at the end of December. Verizon were last up 1.6% in late trading. Berkshire also added to its stake in Liberty Global, disclosing it owned about 7 million class A shares LBTYA -0.27% and 7 million class C shares, versus about 3 million class A shares in the prior quarter. In addition, Berkshire boosted its position in DaVita Healthcare Partners Inc.DVA +0.07% to about 37.6 million shares, up from 36.5 million, while reducing its stake in General Motors Co. GM -0.32% to 30 million shares, down from 40 million. Buffett's company increased its stake in Wal-Mart Stores Inc. WMT +0.29% to about 58 million shares from 49.5 million, and it also ramped up its position in MasterCard Inc.MA +0.58% to 4 million shares, up from 405,000.