Clearwater Paper Corp. (Nasdaq:CLW), TBS International Ltd. (Nasdaq:TBSI) and Kronos Worldwide Inc. (Nasdaq:KRO) are among the biggest percentage gainers in Wednesday's trading among companies with market capitalizations under $1 billion.

Also included among the results: Genco Shipping & Trading Ltd. (Nasdaq:GNK), RehabCare Group, Inc. (Nasdaq:RHB), AK Steel Holding Corp. (Nasdaq:AKS), Chart Industries Inc. (Nasdaq:GTLS), Rockwood Holdings Inc. (Nasdaq:ROC) and Citi Trends Inc. (Nasdaq:CTRN).

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