Fuel Systems Solutions Inc. (Nasdaq:FSYS), ArcSight Inc. (Nasdaq:ARST) and Insulet Corp. (Nasdaq:PODD) are among the most actively traded companies in Friday's trading among companies with market capitalizations under $1 billion.

Also included among the results: Netlogic Microsystems Inc. (Nasdaq:NETL), InterDigital Inc. (Nasdaq:IDCC), American Public Education Inc. (Nasdaq:APEI), Zions Bancorp (Nasdaq:ZION), Energy Conversion Devices Inc. (Nasdaq:ENER) and Bucyrus International Inc. (Nasdaq:BUCY).

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