[company_age]32.0[/company_age][employees]101-250 employees[/employees][funding]debt_financing[/funding][description]Madison Dearborn Partners (MDP) is a leading private equity firm based in Chicago, Illinois. Founded in 1992, the firm has a long and successful track record of investing in middle and upper-middle market companies across four industry sectors: Basic Industries, Financial & Transaction Services, Health Care, and Technology & Government. MDP has raised over $31 billion in capital commitments and has completed investments in more than 160 companies. The firm is known for its industry-focused investment approach, its deep relationships with management teams, and its flexible investment style. MDP is a highly respected firm in the private equity industry and is consistently ranked among the top performers.[/description][ps]Private equity investments[/ps]