Polypore International Inc. (Nasdaq:PPO), Force Protection Inc. (Nasdaq:FRPT) and USANA Health Sciences Inc. (Nasdaq:USNA) are among the biggest percentage gainers in Thursday's trading among companies with market capitalizations under $1 billion.

Also included among the results: GrafTech International Ltd. (Nasdaq:GTI), Atlas America Inc. (Nasdaq:ATLS), Bronco Drilling Co Inc. (Nasdaq:BRNC), 3D Systems Corp. (Nasdaq:TDSC), Unifirst Corp. (Nasdaq:UNF) and TNS Inc. (Nasdaq:TNS).

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