Focused Innovation

Grivner Capital invests in early stage founders who display exceptional leadership and whose firms are dedicated to innovation and hard work.  Our focus is funding not only the future of telecommunications, but also funding closely aligned opportunities in both artificial intelligence and cybersecurity.

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  • We’re thankful for the support of our strategic investors, including Grivner Capital Group, as we continue to grow rapidly. We’ve leveraged their connections and advice to start new partnerships and gain valuable perspective. With the tight-knit nature of the telecom industry, the relationships we have with these investors will continue to be a strong asset in the future.
    — Joel Mulkey, Founder and CEO of Bigleaf Networks
  • We are pleased to have partnered with Grivner Capital. Since joining our board in 2014, Carl and his team have provided not only the financing to help us succeed, but the experience and connections that are crucial for a firm in this space.
    — Dan Wagner, Co-Founder and CEO, Cloudsmartz, Inc.
  • I have known and worked with Carl Grivner for almost 20 years, both in an operating role and with his service on our board. Carl’s experience and advice has proven invaluable in assessing operating and strategic decisions.
    — Greg Peters, Chairman & CEO of Inform, Inc.
  • We have refined our investment strategy over the years and are focused on innovation in telecommunications. We are particularly interested in how telecom intersects with other areas of interest, including cyber and A.I. We have found our industry leadership and vision to be powerful tools to our portfolio firms, and we are always looking for opportunities to expand.
    — Carl J. Grivner, Chairman of Grivner Capital Group
  • Since their first investment in 2014 in our brand, we’ve come to trust John and his firm for their strategic advice and look forward to continuing to grow Greenleaf with them
    — Garret Flynn, Co-Founder, Greenleaf Juicing Company
  • Working with Grivner Capital and Carl has proven to be invaluable. Their deep rooted understanding of the global service provider market is unique. Carl's involvement has contributed significantly to our global telecom go-to-market strategy.
    — William J. Conners, Jr., CEO, AppBus



Carl is the Chairman of Grivner Capital Group and responsible for the strategic vision of the firm as well as working with our portfolio companies.  Based in London, Carl is currently the Chief Executive Officer of Colt Technology Group, S.A and is ranked in the Global Telecoms Business' Power 100 and Top 10 in Europe.  He was previously the Chief Executive Officer of Pacnet, a leading telecom provider in Asia Pacific, which he sold to Telstra for US $725 million in early 2015.  He has over 25 years of international executive and leadership experience including 15 years at the level of Chief Executive Officer at major telecommunications companies in North and Central America, Europe and Asia.  Additionally, Carl currently serves on the boards of Inform, Inc. (formerly NDN News) and CloudSmartz, Inc.

Before his appointment to Pacnet, Carl was Chief Executive Officer of XO Communications, a leading telecommunications company in the United States, where he transformed the business from a local exchange carrier to a national carrier by growing the enterprise customer segment and by developing and implementing a new broadband and data/IP strategy. Under his leadership, XO Communications grew revenues over 50% to $1.5 billion. Carl also led the company's successful acquisition and integration of Allegiance Telecom, achieving $180 million in synergies in 16 months.

Prior to XO Communications, Carl held several executive level positions in the telecommunications and information technology industry.  He was Chief Operating Officer of Global Crossing, Chief Executive Officer of Worldport Communications, Chief Executive Officer of Cable & Wireless plc (Western Hemisphere) where he headed the North American operations, and Chief Executive Officer of Advanced Fibre Communications, where he led its successful IPO.  He also held various senior management positions at Ameritech and IBM.  

Carl holds an undergraduate degree from Lycoming College in Pennsylvania and served as an officer in the United States Marine Corps. Carl is also a FAA instrument rated pilot. 



John is the Managing Director of Grivner Capital Group.  In this role, he leads the due diligence process as well as works with our portfolio firms on a regular basis.  Prior to forming Grivner Capital in 2014, John served on active duty as an officer in the United States Air Force.  He has also practiced corporate law in Chicago.  John holds a law degree from Loyola University Chicago School of Law and an undergraduate degree from the University of Wisconsin - Madison.  He is licensed to practice law in the State of Illinois. 


Mary is a director at the Grivner Capital Group.  She holds a B.S in Marketing from the University of Wisconsin - La Crosse and a M.B.A. from the University of Wisconsin - Whitewater.  She is also an avid volunteer at a Wisconsin-based animal rescue shelter.