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BlueCat Networks
Toronto
BlueCat is a post tech-bubble start-up launched in 2001 by two brothers, Richard and Michael Hyatt, with the goal of providing "simple, secure and affordable" network appliances. BlueCat reports no debt, five years of growth and four years of profitably. The company says its Adonis and Proteus appliances provide core IP addressing and network infrastructure services to some 350 enterprise organizations, including CB Richard Ellis, Comstar Federal Credit Union and the State University of New York.

BridgeHead Software
Woburn, Mass.
Storage management company BridgeHead Software, partly employee-owned, has been operating in the United States since 2001. The engineering and executive teams, however, have been together at one company or another since the late 1980s when they worked at the storage management lab Raxco/UIS, the largest independent software vendor serving Digital customers. BridgeHead's HT Integrated Storage Management software platform provides automated, policy-based data life-cycle management. The company's customers include enterprise organizations from healthcare, publishing, media, government and financial services industries.

Enterasys
Andover, Mass.
Enterasys joined the ranks of privately held companies on March 1, when it was acquired by a group of private investors. The Gores Group and Tennenbaum Capital Partners led the $386 million buyout. Enterasys sprang to life in 2000 when Cabletron, onetime Ethernet switch and network management stronghold, spun out four independent operating companies. In private mode, Enterasys will continue selling multilayer switches, core routers, WAN routers, wireless LANs, network management and intrusion-defense systems. Stemming from its Cabletron roots, the company has a long history in networking, and claims most of the Global 50 as customers.

SunGard
Wayne, Pa.
SunGard, a $4 billion company, went private in August 2005 when acquired by a consortium of private equity investment funds associated with Silver Lake Partners, Texas Pacific Group and others. The company is divided into two, with the SunGard Availability Services division handling its traditional business continuity and disaster recovery business. SunGard Availability Services says it has 10,000 clients worldwide, provides more than 3 million square feet of secure operations space and manages 25,000 miles of dedicated network backbone.