Sigma Designs, Canadian Solar and Kosan Biosciences lead small-cap volume in pre-market

Sigma Designs Inc (Nasdaq:SIGM), Canadian Solar Inc (Nasdaq:CSIQ) and Kosan Biosciences Inc (Nasdaq:KOSN) are among the most actively traded companies in Friday's trading among companies with market capitalizations under $1 billion.

Akeena Solar Inc (Nasdaq:AKNS), Sourcefire Inc (Nasdaq:FIRE) and China Precision Steel Inc (Nasdaq:CPSL) are also among the most actively traded companies.

Here are the most actively traded companies among small caps:

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