CNBC used Symmetric.io, a hedge-fund tracking firm, to find the best stock-picking funds and the companies they are buying. : Boldface names like David Tepper and Dan Loeb get much of the attention, but lower-profile hedge fund managers are performing even better and beating the market. CNBC used Symmetric.io, a top hedge-fund tracking firm, to find the best under-the-radar managers and which stocks they recently bought, according to filings. Four times a year, hedge funds file their long positions with the Securities and Exchange Commission, and the information is released to the public 45 days after each quarter ends.