Duncan T. Butler

Centennial Ventures Inc (Centennial Ventures) is a venture capital firm founded in 1981 by Steve Halstedt. The firm is headquartered in Denver, Colorado.

Grande Communications Holdings, Inc. operates as a holding company with interests in bundled telephone services, internet access, and cable television services. The company was founded in 1999 and is headquartered in San Marcos, TX.

Masergy Communications, Inc. operates as software defined networking services company. Its solutions include unified communications, managed sd-wan and security. The company was founded by Barry D. Nalls in 2001 and is headquartered in Plano, TX.

Covaro Networks, Inc. develops equipment for carriers to enable delivery of intelligent Ethernet services for small and medium businesses. Its products enable carriers to offer intelligent Ethernet services profitably over any facility copper, fiber, sonet and DS3/DS1. Using its unique etherjack demarcation technology, carriers can offer carrier-grade service definition, monitoring and diagnostics for Ethernet-based services. The company was founded in January 2002 and is headquartered in Richardson, TX.

Hoak Media LLC acquires, develops, and operates television and radio stations in small and medium-sized markets. The company was founded by Eric D. Van den Branden and James M. Hoak in August 2003 and is headquartered in Dallas, TX.

Founded in 2004, Legend Ventures LLC is a venture capital firm located in Bethesda, Maryland

Rio Holdings, Inc. provides radiotelephone communications. It offers broadband transport services to medium and large enterprises and communications carriers. The company was founded in November 1999 and is headquartered in Austin, TX.

Prime Cable of Chicago, Inc. owns and operates cable television systems in Montgomery County, Maryland, Arlington, Virginia, and Chicago, Illinois. The company is headquartered in Chicago, IL.