Bill Ackman is one of the most well-known billionaire investors and is the head of the Pershing Square hedge fund. However, unlike many of his billionaire peers in the industry, Ackman is a value investor at heart and primarily invests in easy-to-understand businesses at a perceived discount, as opposed to trying to put his money in the next big thing. According to Pershing's latest U.S. Securities and Exchange Commission (SEC) filings, there are only seven different stocks in the portfolio, and only one of them is a technology stock.