Zion Oil and Gas Inc. (Nasdaq:ZN), Optimer Pharmaceuticals Inc. (Nasdaq:OPTR) and Amedisys Inc. (Nasdaq:AMED) are among the biggest percentage losers in Monday's trading among companies with market capitalizations under $1 billion.

Also included among the results: American Italian Pasta Co. (Nasdaq:AIPC), Answers Corp. (Nasdaq:ANSW), Cepheid (Nasdaq:CPHD), American Equity Investment Life Holding Co. (Nasdaq:AEL), Tredegar Corp. (Nasdaq:TG) and Sport Supply Group Inc. (Nasdaq:RBI).

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