Acacia Research Corporation (ACTG), US Airways Group, Inc. (LCC) Among Billionaire George Soros’s Small Cap Picks

We track 13F filings from hedge funds and other notable investors, using the disclosed information to help us develop investing strategies. For example, we have found that the most popular small cap stocks among hedge funds (which we define as market capitalizations between $1 billion and $5 billion) generate an average excess return of 18 percentage points per year (learn more about our small cap strategy). We can also look at which small cap stocks top investors such as George Soros have been buying and use these as a list of initial ideas for further research. Here are five of Soros’s largest small cap holdings as of the end of December (or see the full list of stocks Soros reported owning from the 13F).

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Soros owned slightly less than 4 million shares of Acacia Research Corporation (NASDAQ:ACTG), which acquires and licenses intellectual property portfolios including patents. Wall Street analysts are very optimistic about the company’s future earnings growth rate: the stock carries trailing and forward P/E multiples of 24 and 11, respectively, with a five-year PEG ratio of 0.6. Note that the market likes the company, as shown by the high trailing earnings multiple but is much less bullish than the sell-side. Malcolm Fairbairn’s Ascend Capital reported a position of 1.2 million shares as of the end of December.

SOROS FUND MANAGEMENTAccording to the 13F, Soros had a little over 3 million shares of Shutterfly, Inc. (NASDAQ:SFLY) in his portfolio at the end of the fourth quarter of 2012. The digital photo website and app developer, like many social media companies, has been seeing high revenue growth. However, earnings were also up 50% in the fourth quarter of 2012 versus a year earlier. Earnings are certainly low- the forward P/E is 53- but its growth potential may make it worth watching. Alydar Capital, managed by John Murphy, had Shutterfly, Inc. (NASDAQ:SFLY) as its largest holding according to that fund’s own 13F (find Alydar’s favorite stocks).

US Airways Group, Inc. (NYSE:LCC) was one of the billionaire’s top small cap picks. The airline is in the process of merging with bankrupt American Airlines; while this activity does include integration risk, many analysts expect that the resulting industry consolidation will allow US Airways Group, Inc. (NYSE:LCC) to push up prices particularly in common routes with American. Airlines, of course, are often considered unwise investments and market pessimism as US Airways Group, Inc. (NYSE:LCC) trading at low earnings multiples. Billionaire David Tepper’s Appaloosa Management cut its stake somewhat but still owned over 12 million shares at the beginning of January (check out Tepper’s stock picks).