The story
"OPNET" was Alain Cohen's (co-founder, CTO & President) graduate project for a networking course while he was at MIT. OPNET stood for Optimized Network Engineering Tools. Alain, along with brother Marc (co-founder, CEO & Chairman) and classmate Steven Baraniuk, decided to commercialize the software. The company's first product was OPNET Modeler, a software tool for computer network modeling and simulation.
Since becoming a public company in August 2000, OPNET executed the following acquisitions:
March 2001: NetMaker Division of Make Systems
January 2002: WDM NetDesign B.V.B.A
October 2004: Altaworks Corporation
October 2007: substantially all of the assets of Network Physics, Inc.
August 2010: DSAuditor product line from Embarcadero Technologies
May 2012: Clarus Systems, Inc.
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As an independent company, OPNET grew profitably throughout its history. SEC filings are available with further information about its IPO, annual reports, and quarterly reports.
From Wikipedia’s article on OPNET, shared under CC BY-SA 4.0.5