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.

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.