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Four times a year, hedge funds file their long positions with the SEC and the information is released to the public 45 days after each quarter ends. So what did the smart money buy with the

December filings out this week? CNBC Pro asked Symmetric.io , a top hedge fund tracking firm, for a ranking of the best stock picking managers, what they are long and what names they are

buying. Symmetric.io grades the 1,000 hedge funds in its database with a proprietary indicator called StockAlpha. It is derived by comparing the performance of equities in the fund to that

of a sector ETF. Read More Momentum most overvalued since tech bust: Analyst Here are StockAlpha's top 10 stock-picking hedge funds, many of them run by managers you've likely

never heard of. One way to find the most promising names is screen for which stocks are owned by more than one of the top 10 stock-picker funds. Alphabet is the most widely owned stock by

the top pickers. Other notable hedge funds that didn't make the top 10 also bought or added to their Alphabet position during the fourth quarter, according to 13F filings. Appaloosa

Management and Coatue Management added to their stakes, while Lone Pine Capital, Soros, Corvex and Duquesne Family Office started positions in the company formerly known as Google. Some

investors focus on positions where funds recently increased their position size as it may mean the manager believes it offers the best current investment opportunity. Here are some new

recent additions from the top 10 stock pickers. Read More Apple bond offering may mark bottom for yields