Allos Therapeutics Inc. (Nasdaq:ALTH), Amedisys Inc. (Nasdaq:AMED) and Novavax Inc. (Nasdaq:NVAX) are among the most actively traded companies in Thursday's trading among companies with market capitalizations under $1 billion.

Also included among the results: Vical Inc. (Nasdaq:VICL), China Natural Gas Inc. (Nasdaq:CHNG), Spectrum Pharmaceuticals Inc. (Nasdaq:SPPI), Sequenom Inc. (Nasdaq:SQNM), Century Aluminum Co. (Nasdaq:CENX) and Sanmina-SCI Corp. (Nasdaq:SANMD).

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