Columbia Bancorp (Nasdaq:CBBO), ARYx Therapeutics Inc. (Nasdaq:ARYX) and Transmeta Corp. (Nasdaq:TMTA) are among the biggest percentage gainers in Thursday's trading among companies with market capitalizations under $1 billion.

Also included among the results: Silicon Graphics Inc. (Nasdaq:SGIC), Thomas Weisel Partners Group Inc. (Nasdaq:TWPG), BancTrust Financial Group Inc. (Nasdaq:BTFG), Guaranty Bancorp Ord. (Nasdaq:GBNK), Formula Systems Depository Receipt (Nasdaq:FORTY) and Cypress Bioscience Inc. (Nasdaq:CYPB).

Here are the biggest percentage gainers among small caps:

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