MDS Inc. (Nasdaq:MDZ), Medicines Co. (Nasdaq:MDCO) and Imergent Inc. (Nasdaq:IIG) are among the biggest percentage gainers in Wednesday's trading among companies with market capitalizations under $1 billion.

Also included among the results: Computer Task Group Inc. (Nasdaq:CTGX), LCA Vision Inc. (Nasdaq:LCAV), DrdGold ADR (Nasdaq:DROOY), Gammon Gold Inc. (Nasdaq:GRS), CardioNet Inc. (Nasdaq:BEAT) and NetGear Inc. (Nasdaq:NTGR).

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