Matrixx Initiatives (Nasdaq:MTXX), A Power Energy Generation Systems Ltd (Nasdaq:APWR) and O2Micro International Ltd (Nasdaq:OIIM) are among the most actively traded companies in Thursday's trading among companies with market capitalizations under $1 billion.

Also included among the results: JA Solar Holdings Co Ltd (Nasdaq:JASO), Molecular Insight Pharmaceuticals Inc (Nasdaq:MIPI), Savient Pharmaceuticals Inc (Nasdaq:SVNT), ImmunoGen Inc (Nasdaq:IMGN), Century Aluminum Co (Nasdaq:CENX) and Internet Gold-Golden Lines Ltd (Nasdaq:IGLD).

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