InterVoice Inc (Nasdaq:INTV), IPC The Hospitalist Co Inc (Nasdaq:IPCM) and Solarfun Power Holdings Co Ltd (Nasdaq:SOLF) are among the most actively traded companies in Wednesday's trading among companies with market capitalizations under $1 billion.

Also included among the results: Canadian Solar Inc (Nasdaq:CSIQ), National Coal Corp (Nasdaq:NCOC), Orckit Communications Ltd (Nasdaq:ORCT), Orion Energy Systems Inc (Nasdaq:OESX), CoStar Group Inc (Nasdaq:CSGP) and China Sunergy Co Ltd (Nasdaq:CSUN).

Here are the most actively traded companies among small caps: 

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