Medivation Inc (Nasdaq:MDVN), Solarfun Power Holdings Co Ltd (Nasdaq:SOLF) and Sequenom Inc (Nasdaq:SQNM) are among the most actively traded companies in Tuesday's trading among companies with market capitalizations under $1 billion.

Also included among the results: Canadian Solar Inc (Nasdaq:CSIQ), ViroPharma Inc (Nasdaq:VPHM), Given Imaging Ltd (Nasdaq:GIVN), True Religion Apparel Inc (Nasdaq:TRLG), Quest Energy Partners L P (Nasdaq:QELP) and RAM Energy Resources Inc (Nasdaq:RAME).

Here are the most actively traded companies among small caps:

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