Bill Ackman 's Pershing Square opened a 7.72 million-share position in Lowe's Companies, Inc. (NYSE:LOW) during Q2 and has been amply rewarded for the move thus far, with shares having jumped by nearly 25% since he revealed his $1 billion position in the company. Ackman has said that Lowe's has similar upside potential under new CEO Marvin Ellison as one of his most successful past investments, Canadian Pacific Railway, did under its Ackman-appointed CEO. Ellison, who previously served in upper management positions at Home Depot, has been busy reworking Lowe's Companies, Inc. (NYSE:LOW) executive structure to increase management's efficiency.