Pegasystems Inc. (Nasdaq:PEGA), NCI Building Systems Inc. (Nasdaq:NCS) and BWAY Holding Co. (Nasdaq:BWY) are among the biggest percentage gainers in Tuesday's trading among companies with market capitalizations under $1 billion.

Also included among the results: Astronics Corp. (Nasdaq:ATRO), WellCare Health Plans Inc. (Nasdaq:WCG), BE Aerospace Inc. (Nasdaq:BEAV), Altra Holdings Inc. (Nasdaq:AIMC), Geron Corp. (Nasdaq:GERN) and National Interstate Corp. (Nasdaq:NATL).

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