Hedge Fund and Insider Trading News: Bill Ackman, Marble Arch Investments, Elliott Management, Keane Group Inc (FRAC), Vista Outdoor Inc (VSTO), MedEquities Realty Trust Inc (MRT), and More

Bill Ackman's Pershing Square has taken a stake in Lowe's, a source tells CNBC. Ackman's new stake in the home improvement retailer was first reported by Dow Jones.

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