Matrixx Initiatives (Nasdaq:MTXX), A Power Energy Generation Systems Ltd. (Nasdaq:APWR) and Medicines Co. (Nasdaq:MDCO) are among the most actively traded companies in Friday's trading among companies with market capitalizations under $1 billion.

Also included among the results: ATP Oil & Gas Corporation (Nasdaq:ATPG), AgFeed Industries Inc. (Nasdaq:FEED), Century Aluminum Co. (Nasdaq:CENX), China Medical Technologies Inc. (Nasdaq:CMED), Fuqi International Inc. (Nasdaq:FUQI) and Spectrum Pharmaceuticals Inc. (Nasdaq:SPPI).

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