Investing in Bill Ackman stocks ranks among the top picks on the stock market today.Founded over two decades ago, stock picks from Ackman’s Pershing Square hedge fund have become a key talking point among value investors. He embraces maverick investor Warren Buffett’s time-honored principle that “Diversification is protection against ignorance.”Hence, Ackman operates a tightly focused portfolio. By the end of the first quarter, his portfolio was concentrated around just six companies, with assets worth upwa ...