Olympic Steel, Dendreon and GFI Group lead small-cap volume in pre-market

Olympic Steel Inc (Nasdaq:ZEUS), Dendreon Corp (Nasdaq:DNDN) and GFI Group Inc (Nasdaq:GFIG) are among the most actively traded companies in Thursday's trading among companies with market capitalizations under $1 billion.

Also included among the results: China Sunergy Co Ltd (Nasdaq:CSUN), Arris Group Inc (Nasdaq:ARRS), National Coal Corp (Nasdaq:NCOC), China Finance Online Co Ltd (Nasdaq:JRJC), DXP Enterprises Inc (Nasdaq:DXPE) and IntegraMed America Inc (Nasdaq:INMD).

Here are the most actively traded companies among small caps:

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