Activist investor Bill Ackman's Pershing Square Capital Management added General Motors Co. (GM) to his portfolio in the quarter ended Dec. 31, 2010, according to a regulatory filing Monday.

The hedge fund manager, which reported equities stakes worth a total $5.84 billion in the document, bought 7.2 million shares in the automaker, a stake that would be worth $261 million as of Monday's close.

For the three months ended Dec. 31, Ackman almost tripled Pershing Square's holding in General Growth Properties Inc. (GGP) to 70 million shares from 24 million at the end of the previous quarter. He had earlier disclosed holding increases in J.C. Penny Co. Inc. (JCP) to 34.9 million shares and Fortune Brands Inc. (FO) to 16.7 million shares.

Meanwhile, he substantially reduced his stake in Automatic Data Processing Inc. (ADP) to less than a fifth of the 8.7 million shares Pershing Square owned at the end of September, and halved his holding in Target Corp. (TGT) to 7.4 million shares.

He also reduced his stake Corrections Corp. of America (CXW) by 30% to 7.8 million shares, and reduced his stake in Kraft Food Inc. (KFT) by a similar proportion to 19.5 million shares.

-By Amy Or, Dow Jones Newswires; +1 212 416 3142; amy.or@dowjones.com

 
 
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