Wright Medical Group Inc (Nasdaq:WMGI), Palm Inc (Nasdaq:PALM) and Red Robin Gourmet Burgers Inc (Nasdaq:RRGB) are among the most actively traded companies in Friday's trading among companies with market capitalizations under $1 billion.

Also included among the results: CV Therapeutics Inc. (Nasdaq:CVTX), Neutral Tandem Inc. (Nasdaq:TNDM), Cubist Pharmaceuticals Inc. (Nasdaq:CBST), Geron Corp. (Nasdaq:GERN), Centennial Communications Corp. (Nasdaq:CYCL) and Zoran Corp. (Nasdaq:ZRAN).

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