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Communications and Systems
 Portfolio Companies

Chelsio Communications, Sunnyvale, California
Chelsio provides high-speed protocol-acceleration products to manufacturers of server, storage, and data-communications equipment.

 IDEngines Logo
Identity Engines, Inc. acquired by Nortel
Identity Engines sells network-focused, identity management systems to enterprise customers.

InfiniRoute Networks, acquired by Transaction Network Services (NYSE:TNS)
InfiniRoute Networks provides fully managed Voice over IP (VoIP) peering services for wire-line and wireless carriers who need PSTN-quality VoIP connections worldwide.

Sensys Networks, Berkeley, California
Sensys Networks sells wireless sensor networking devices for Intelligent Traffic Systems, ITS, such as freeway and arterial traffic monitoring, and intersection traffic signal control.

Venturi Wireless, Sunnyvale, California
Venturi Wireless enables enterprises and carriers to significantly accelerate content delivery over any wired or wireless wide area network.

 Prior Investments by Horizon Managing Directors

AudioTalk Networks (acquired by HearMe) Mountain View, California
AudioTalk was a provider of Internet voice and IP telephony technologies to Web businesses. The company was acquired by HearMe in 2000.

Harmonic, Inc. (NASDAQ: HLIT) Sunnyvale, California
Harmonic Inc. is a leading provider of broadband optical networking and digital video systems to cable, satellite, terrestrial, telecom and wireless operators.

 http://www.palm.com/ Palm™, Inc. (NASDAQ: PALM), Santa Clara, California
Palm™, Inc. is the leading pioneer in mobile and wireless personal digital assistant, PDA, solutions.
RapidStream, Inc. acquired by WatchGuard Technologies (NASDAQ: WGRD) Santa Clara, California
RapidStream, Inc. develops third generation network security appliances that simultaneously deliver high performance VPN, firewall, quality-of-service, network address translation, load balancing and hacker defense.

Sandpiper Networks, Inc. acquired by Cable & Wireless America (NASDAQ: SVVS) Westlake Village, California
Sandpiper Networks, Inc. is a provider of adaptive content distribution services.

SpectraLink Corporation, acquired by Polycom (NASDAQ: PLCM),Boulder, Colorado
SpectraLink Corporation is the market leader in providing wireless telephone systems for the workplace.


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