RC2 Corp. (Nasdaq:RCRC), Zep Inc. (Nasdaq:ZEP) and Alkermes Inc. (Nasdaq:ALKS) are among the biggest percentage losers in Friday's trading among companies with market capitalizations under $1 billion.

Also included among the results: Heritage Crystal Clean Inc. (Nasdaq:HCCI), A. Schulman Inc. (Nasdaq:SHLM), ATMI Inc. (Nasdaq:ATMI), Diodes Inc. (Nasdaq:DIOD), AZZ Inc. (Nasdaq:AZZ) and DealerTrack Holdings Inc. (Nasdaq:TRAK).

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