AMAG Pharmaceuticals, DryShips and Optimer Pharmaceuticals lead small-cap volume in pre-market

AMAG Pharmaceuticals Inc. (Nasdaq:AMAG), DryShips Inc. (Nasdaq:DRYS) and Optimer Pharmaceuticals Inc. (Nasdaq:OPTR) are among the most actively traded companies in Thursday's trading among companies with market capitalizations under $1 billion.

Also included among the results: Solarfun Power Holdings Co Ltd. (Nasdaq:SOLF), TBS International Ltd. (Nasdaq:TBSI), United Community Banks Inc. (Nasdaq:UCBI), Canadian Solar Inc. (Nasdaq:CSIQ), A Power Energy Generation Systems Ltd. (Nasdaq:APWR) and Pan American Silver Corp. (Nasdaq:PAAS).

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