Dorman Products Inc (Nasdaq:DORM), XL Capital Ltd (Nasdaq:XL) and Prospect Capital Corp (Nasdaq:PSEC) are among the biggest percentage gainers in Friday's trading among companies with market capitalizations under $1 billion.

Also included among the results: Willis Lease Finance Corp (Nasdaq:WLFC), Eastern Virginia Bankshares Inc (Nasdaq:EVBS), West Bancorp Inc (Nasdaq:WTBA), Ardea Biosciences Inc (Nasdaq:RDEA), Western Alliance Bancorp (Nasdaq:WAL) and PacWest Bancorp (Nasdaq:PACW).

Here are the biggest percentage gainers among small caps:

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