Halozyme Therapeutics Inc. (Nasdaq:HALO), Smith & Wesson Holding Corp. (Nasdaq:SWHC) and Century Aluminum Co. (Nasdaq:CENX) are among the most actively traded companies in Tuesday's trading among companies with market capitalizations under $1 billion.

Also included among the results: A Power Energy Generation Systems Ltd. (Nasdaq:APWR), Focus Media Holding Ltd. (Nasdaq:FMCN), Acura Pharmaceuticals Inc. (Nasdaq:ACUR), Sterling Construction Co Inc. (Nasdaq:STRL), Sonic Corp. (Nasdaq:SONC) and AgFeed Industries Inc. (Nasdaq:FEED).

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