DryShips Inc. (Nasdaq:DRYS), JA Solar Holdings Co Ltd. (Nasdaq:JASO) and Orexigen Therapeutics Inc. (Nasdaq:OREX) are among the most actively traded companies in Tuesday's trading among companies with market capitalizations under $1 billion.

Also included among the results: PDL BioPharma Inc. (Nasdaq:PDLI), Solarfun Power Holdings Co Ltd. (Nasdaq:SOLF), Zhongpin Inc. (Nasdaq:HOGS), Aladdin Knowledge Systems Ltd. (Nasdaq:ALDN), American Commercial Lines Inc. (Nasdaq:ACLI) and Canadian Solar Inc. (Nasdaq:CSIQ).

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