Chemgenex Pharm (Nasdaq:CXSP), LSB Corp (Nasdaq: LBSX) and Zumiez Inc (Nasdaq:ZUMZ) are among the biggest percentage gainers in Friday's trading among companies with market capitalizations under $1 billion.     

Also included among the results: Cato Corp (Nasdaq:CTR), Deltek Inc (Nasdaq:PROJ), RXi Pharmaceuticals Corp (Nasdaq:RXII), Princeton National Bancorp Inc (Nasdaq:PNBC), Micromet Inc (Nasdaq:MITI) and Torch Energy Royalty Trust (Nasdaq:TRU).   

Here are the biggest percentage gainers among small caps:    

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