CNBC used a hedge-fund tracking firm, to find the best stock-picking hedge funds and the stocks they are buying. : Well-known hedge-fund managers such as David Tepper and Dan Loeb get much of the attention, but there are lower-profile stars that 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.