Rockbridge, a Detroit-based private equity firm, completed the acquisition of ProSites, a provider of comprehensive online marketing solutions, from The Riverside. Financial terms were not disclosed. "ProSites is our latest investment in the digital marketing space. Dave Rutan and his team have built a market-leading company with a broad portfolio of products that serve local community professionals. We look forward to working with Dave and the company to accelerate the company's growth, increase the range of services it provides and targets new verticals that can benefit from ProSites' services," Kevin Prokop, Rockbridge Managing Partner.