Founded in 1993 by brothers Tom and David Gardner, The Motley Fool helps millions of people attain financial freedom through our website, podcasts, books, newspaper column, radio show, and premium investing services. Billionaire Bill Ackman may be down on his luck recently, but he's not out. His hedge fund management company, Pershing Square Capital Management, runs a concentrated portfolio of stocks that it generally holds for the long haul. For this reason, its 13F regulatory filings are watched by many who want to get an inside look at which stocks Ackman believes will generate market-beating returns for years to come.