Shares of the following companies may have unusual moves in U.S. trading. Stock symbols are in parentheses, and prices are as of 6:11 p.m. in New York. Standard & Poor’s 500 Index futures expiring in September fell 0.2 percent to 1,196.30. Billionaire investor Warren Buffett’s Berkshire Hathaway Inc. (BRK/A) (BRK/B US) added a stake in Dollar General Corp. (DG) , the biggest dollar-store chain in the U.S., and increased its holding in MasterCard Inc. (MA) , the world’s second-biggest payments network, according to a regulatory filing. Berkshire also boosted its shares in Wells Fargo & Co. (WFC) , the biggest U.S. home lender. Dollar General gained 4.8 percent to $33.74. Agilent Technologies Inc. (A) declined 1.3 percent to $37. The maker of scientific-testing equipment reported third- quarter earnings minus some items of 77 cents a share, beating the average estimate of 73 cents a share of 12 analysts, Bloomberg data show. Pharmaceutical Product Development Inc. (PPDI) gained 4.6 percent to $32.97. Carlyle Group is in exclusive talks to buy the clinical research company, said five people with knowledge of the discussions. Urban Outfitters Inc. (URBN) dropped 6.4 percent to $27.80. The clothing retailer said second-quarter earnings were 35 cents a share, beating the average estimate of 25 analysts of 32 cents a share, Bloomberg data show. Valassis Communications Inc. (VCI) gained 4.6 percent to $25.76. The company that offers mass- and targeted-mail services and collects data on shoppers will replace Immucor Inc. in the Standard & Poor’s MidCap 400 Index after the close of trading Aug. 18. Immucor is being acquired by TPG Partners. To contact the reporter on this story: Victoria Taylor in New York at vtaylor6@bloomberg.net To contact the editor responsible for this story: Michael P. Regan at mregan12@bloomberg.net.

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