The firm, which was founded in 1986 and has invested $575 million in 56 separate acquisitions, focuses on niche manufacturing industries such as building products, infrastructure, specialty packaging, and specialty manufacturing. Stonebridge Partners makes control and non-control investments in middle-market companies seeking capital for add-on acquisition, growth and expansion capital, management buyouts, carveout, acquisition financing, and recapitalization, particularly those operating in the services, distribution, aerospace, and infrastructure products and services sectors.