AMAG Pharmaceuticals Inc. (Nasdaq:AMAG), Protection One Inc. (Nasdaq:PONE) and Optimer Pharmaceuticals Inc. (Nasdaq:OPTR) are among the biggest percentage gainers in Thursday's trading among companies with market capitalizations under $1 billion.

Also included among the results: Global Sources Ltd. (Nasdaq:GSOL), Patriot Coal Corp. (Nasdaq:PCX), Transcat Inc. (Nasdaq:TRNS), Ameris Bancorp (Nasdaq:ABCB), Aristotle Corp. (Nasdaq:ARTL) and Cadence Financial Corp. (Nasdaq:CADE).

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