Primus Capital, a growth-oriented private equity firm focused on investing in leading software, healthcare and technology-enabled services companies, completed the investment in Rev.io, a sophisticated billing, back-office and payments SaaS platform to communications, Internet of Things, and other managed service and technology providers. Financial terms were not disclosed. “Rev.io focuses on solving some of the most complex invoicing and billing use cases in the communications market while operating as a true business partner to its customers. The positive feedback we got from the market was overwhelming,” Ron Hess, Primus Managing Director.