Sequenom Inc. (Nasdaq:SQNM), Crocs Inc. (Nasdaq:CROX) and Oncothyreon Inc. (Nasdaq:ONTY) are among the most actively traded companies in Monday's trading among companies with market capitalizations under $1 billion.

Also included among the results: UAL Corp. (Nasdaq:UAUA), Mellanox Technologies Ltd. (Nasdaq:MLNX), LogMeIn Inc. (Nasdaq:LOGM), JA Solar Holdings Co Ltd. (Nasdaq:JASO), Echelon Corp. (Nasdaq:ELON) and China Fire & Security Group Inc. (Nasdaq:CFSG).

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