Diamond Management & Technology Consultants Inc (Nasdaq:DTPI), Pool Corporation (Nasdaq:POOL) and Royale Energy Inc (Nasdaq:ROYL) are among the most actively traded companies in Friday's trading among companies with market capitalizations under $1 billion.

Also included among the results: Iconix Brand Group Inc (Nasdaq:ICON), Netlogic Microsystems Inc (Nasdaq:NETL), Ricks Cabaret International Inc (Nasdaq:RICK), Bidz com Inc (Nasdaq:BIDZ), National Coal Corp (Nasdaq:NCOC) and Canadian Solar Inc (Nasdaq:CSIQ).

Here are the most actively traded companies among small caps:

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