TomoTherapy Inc (Nasdaq:TOMO), Transition Therapeutics Inc (Nasdaq:TTHI) and Radiant Systems Inc (Nasdaq:RADS) are among the biggest percentage losers in Friday's trading among companies with market capitalizations under $1 billion.

Also included among the results: Winn Dixie Stores Inc (Nasdaq:WINN), Union Drilling Inc (Nasdaq:UDRL), National Interstate Corp (Nasdaq:NATL), Dynamic Materials Corp (Nasdaq:BOOM), eHealth Inc (Nasdaq:EHTH) and Wabash National Ord Shs (Nasdaq:WNC).

Here are the biggest percentage losers among small caps:

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