DryShips Inc. (Nasdaq:DRYS), Solarfun Power Holdings Co Ltd. (Nasdaq:SOLF) and (Nasdaq:SWKS) are among the most actively traded companies in Friday's trading among companies with market capitalizations under $1 billion.

Also included among the results: A Power Energy Generation Systems Ltd. (Nasdaq:APWR), Canadian Solar Inc. (Nasdaq:CSIQ), James River Coal Co. (Nasdaq:JRCC), Blackbaud Inc. (Nasdaq:BLKB), OmniVision Technologies Inc. (Nasdaq:OVTI) and Gibraltar Industries Inc. (Nasdaq:ROCK).

Here are the most actively traded companies among small caps:

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