Plexus Corp. (Nasdaq:PLXS), United America Indemnity Ltd. (Nasdaq:INDM) and Force Protection Inc. (Nasdaq:FRPT) are among the biggest percentage gainers in Thursday's trading among companies with market capitalizations under $1 billion.

Also included among the results: Elbit Imaging Ltd. (Nasdaq:EMITF), Superior Well Services Inc. (Nasdaq:SWSI), Chindex International Inc. (Nasdaq:CHDX), Darling International Inc. (Nasdaq:DAR), Tetra Technologies Inc. (Nasdaq:TTI) and Asbury Automotive Group Inc. (Nasdaq:ABG).

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