The Vistria Group and GHO Capital Partners will acquire a controlling interest in Alcami Corp. from Madison Dearborn Partners (MDP) and Ampersand Capital Partners, according to a news release.

Alcami, based in Wilmington, N.C., is a contract development, testing and manufacturing organization for pharma and biotech companies. Founded in 1979, the company provides solutions for analytical development, clinical to commercial sterile and oral solid manufacturing, packaging, microbiology, cGMP biostorage, environmental monitoring and pharmaceutical support services.

The Vistria Group, based in Chicago, focuses on making investments in middle market companies in healthcare and a few other industries. Founded in 2013, the firm pursues control and minority equity investments and prefers to make more substantial investments from a dollars perspective in companies with at least $100 million in revenue.

GHO Capital Partners, or Global Healthcare Opportunities, is a London-based specialist healthcare investor.

MDP, based Chicago, pursues management buyouts and structured minority investments. Founded in 1992, the firm focuses on value-oriented mature businesses and growth-oriented companies in several industries, including healthcare.

Ampersand, based in Wellesley, Mass., is a middle market private equity firm with a focus on growth equity investments in the healthcare sector. Founded in 1988, the firm typically pursues majority or minority positions in companies generating between $10 million and $100 million in revenue.

Terms of the transaction were not disclosed.