NEW YORK ( Stockpickr) -- At Stockpickr, we track the top 30 holdings of a variety of high-profile investors, such as Warren Buffett and Carl Icahn.One of our most popular portfolios, second only to Buffett's, is that of George Soros' Soros Fund Management. Soros ranks No. 22 in Forbes' list of the world's billionaires, with a net worth of $20 billion. >>8 Stocks John Paulson Loves In the fourth quarter, according to the most recent 13F filing with the Securities and Exchange Commission, Soros sold out of over 300 positions in the fourth quarter, including Amazon ( AMZN), Biogen Idec ( BIIB) and AT&T ( T). But what did the billionaire buy? Here's a look at seven stocks that Soros bought in the most recently reported quarter, which are all part of the top 30 holdings tracked on Stockpickr.