Savient Pharmaceuticals Inc. (Nasdaq:SVNT), ATP Oil & Gas Corporation (Nasdaq:ATPG) and Wind River Systems Inc. (Nasdaq:WIND) are among the most actively traded companies in Friday's trading among companies with market capitalizations under $1 billion.

Also included among the results: JA Solar Holdings Co Ltd. (Nasdaq:JASO), Century Aluminum Co. (Nasdaq:CENX), ArcSight Inc. (Nasdaq:ARST), Tongxin International Ltd. (Nasdaq:TXIC), Solarfun Power Holdings Co Ltd. (Nasdaq:SOLF) and China Sunergy Co Ltd. (Nasdaq:CSUN).

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