Federal Agricultural Mortgage Corp. (Nasdaq:AGM), STEC Inc. (Nasdaq:STEC) and O'Charley's Inc. (Nasdaq:CHUX) are among the biggest percentage gainers in Tuesday's trading among companies with market capitalizations under $1 billion.

Also included among the results: Winn Dixie Stores Inc. (Nasdaq:WINN), Nelnet Inc. (Nasdaq:NNI), Kenexa Corp. (Nasdaq:KNXA), RXi Pharmaceuticals Corp. (Nasdaq:RXII), Insight Enterprises Inc. (Nasdaq:NSIT) and Consolidated Water Co. Ltd (Nasdaq:CWCO).

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