Ackman's Pershing Square Capital Management just plowed more money into another "Magnificent Seven" stock.Bill Ackman is a billionaire hedge fund manager as CEO of Pershing Square Capital Management. Unlike many of his peers on Wall Street, Ackman primarily keeps a tightly concentrated portfolio, with Pershing Square owning only about 10 stocks at any given time.For the last couple of years, Pershing Square's most direct artificial intelligence (AI) investment has been a sizable position in Alphabet. Ackman ...