Rigel Pharmaceuticals Inc. (Nasdaq:RIGL), Sequenom Inc. (Nasdaq:SQNM) and Energy Conversion Devices Inc. (Nasdaq:ENER) are among the most actively traded companies in Friday's trading among companies with market capitalizations under $1 billion.

Also included among the results: Canadian Solar Inc. (Nasdaq:CSIQ), Force Protection Inc. (Nasdaq:FRPT), Changyou.com Ltd. (Nasdaq:CYOU), Biocryst Pharmaceuticals Inc. (Nasdaq:BCRX), Century Aluminum Co. (Nasdaq:CENX) and SonicWALL Inc. (Nasdaq:SNWL).

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