Gymboree Corp. (Nasdaq:GYMB), Nymagic Inc. (Nasdaq:NYM) and US Physical Therapy Inc. (Nasdaq:USPH) are among the biggest percentage losers in Thursday's trading among companies with market capitalizations under $1 billion.

Also included among the results: Atlas Energy Resources LLC (Nasdaq:ATN), K Swiss Inc. (Nasdaq:KSWS), United America Indemnity Ltd. (Nasdaq:INDM), Legacy Reserves Units (Nasdaq:LGCY), Susser Holdings Corp. (Nasdaq:SUSS) and Alaska Air Group Inc. (Nasdaq:ALK).

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