Geron Corp (Nasdaq:GERN), Prospect Capital Corp (Nasdaq:PSEC) and Spectrum Pharmaceuticals Inc (Nasdaq:SPPI) are among the most actively traded companies in Tuesday's trading among companies with market capitalizations under $1 billion.

Also included among the results: Fuqi International Inc (Nasdaq:FUQI), AMAG Pharmaceuticals Inc (Nasdaq:AMAG), XenoPort Inc (Nasdaq:XNPT), Canadian Solar Inc (Nasdaq:CSIQ), American Capital Agency Corp (Nasdaq:AGNC) and ClickSoftware Technologies Ltd (Nasdaq:CKSW).

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