Two of the largest firms in the private-equity world, Kohlberg Kravis Roberts ( KKR) and Blackstone ( BX) , revealed in filings with the SEC that they've snapped up stocks across a range of companies throughout the second quarter. For the most part, it appears Blackstone chose to diversify its portfolio in the second quarter, while KKR made some heavy investments in food and health care names. Fellow PE giant Carlyle  ( CG) , which posted its 13-F last week, added no new positions to its portfolio, instead scaling back in general across a number of positions. After scrapping positions in companies including renewable-energy firm TerraForm Power ( TERP) in the second quarter, Blackstone said in its SEC filing it has added a host of new positions to its portfolio, including Canadian online-gambling site Amaya ( AYA) , nitrogen-fertilizer producer CVR Partners ( UAN) and private-label credit card issuer Synchrony Financial  ( SYF) . Meanwhile, KKR's largest new portfolio members were added via three purchases: 4.8 million shares of Amedisys ( AMED) ; 3.5 million shares of Community Health Systems ( CYH) ; and 83 million shares of U.S. Food ( USFD) .

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