Quad-C Management, a middle market private equity firm, completed an investment in Titan Security Group, one of the largest security companies in North America. Financial terms were not disclosed. "Quad-C has evaluated a number of security services companies, and we came away very impressed with Titan's exceptional track record of more than 10 years of consecutive double digit revenue growth and industry leading employee retention. The security services market is highly fragmented, and we believe Titan will be a differentiated platform in the space as we look to expand," Tim Billings, Quad-C Partner.