Aug 14 (Reuters) - Warren Buffett's Berkshire Hathaway BRKa.N disclosed on Thursday that it has begun investing in UnitedHealth Group UNH.N after the insurer became a target for many Americans upset over the direction of the nation's healthcare.
Berkshire said it owned 5.04 million UnitedHealth shares worth about $1.57 billion as of June 30.
Buffett's conglomerate also said it sold 20 million shares of Apple AAPL.O, its largest stock holding, in the second quarter, reducing its stake to 280 million shares.
Berkshire also revealed it has bought the common stocks of security products provider Allegion ALLE.N, home builder DR Horton DHI.N, outdoor advertiser Lamar Advertising LAMR.O and steel maker Nucor NUE.N, and significantly increased its stake in homebuilder Lennar LEN.N.