One of the most successful deals of the week came from Fortinet ( FTNT), as it ranked as the fourth best U.S. debut of 2009.

Other deals came from Archipelago Learning ( ARCL), 7 Days ( SVN), Cloud Peak Energy ( CLD) and Global Defense Technology & Systems ( GTEC).

-- Reported by Jeanine Poggi in New York

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Copyright 2009 Inc. All rights reserved. This material may not be published, broadcast, rewritten, or redistributed. AP contributed to this report.

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