JA Solar Holdings Co Ltd (Nasdaq:JASO), Zhongpin Inc. (Nasdaq:HOGS) and GSI Commerce Inc. (Nasdaq:GSIC) are among the most actively traded companies in Thursday's trading among companies with market capitalizations under $1 billion.

Also included among the results: DryShips Inc. (Nasdaq:DRYS),Vasco Data Security International Inc. (Nasdaq:VDSI),A Power Energy Generation Systems Ltd. (Nasdaq:APWR),Central European Media Enterprises Ltd. (Nasdaq:CETV),Mellanox Technologies Ltd. (Nasdaq:MLNX) and Silver Standard Resources Inc. (Nasdaq:SSRI).

Here are the most actively traded companies among small caps:

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