Geron Corp. (Nasdaq:GERN), Century Aluminum Co. (Nasdaq:CENX) and Alkermes Inc. (Nasdaq:ALKS) are among the most actively traded companies in Tuesday's trading among companies with market capitalizations under $1 billion.

Also included among the results: Eagle Bulk Shipping Inc (Nasdaq:EGLE), Canadian Solar Inc. (Nasdaq:CSIQ), Harmonic Inc. (Nasdaq:HLIT), PDL BioPharma Inc. (Nasdaq:PDLI), Pegasystems Inc. (Nasdaq:PEGA) and TBS International Ltd. (Nasdaq:TBSI).

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