Capstone Partners, a middle-market investment banking firm, has promoted Sam Matlin to senior director and Chris Cardinale, Erik Larson and Wolfgang Zahner to director.

Matlin, based in Denver, Colo., has been with the firm for over two years and has been promoted to senior director within Capstone’s industrials investment banking group, where he will maintain a focus on both industrial, commercial and residential services and equipment as a service.

Cardinale, based in Orange County, Calif., has been with the firm for over eight years and has been promoted to director within Capstone’s industrials investment banking group, where he will focus on the environmental, health and safety and facilities services sectors.

Larson, based in Denver, has been with Capstone for over four years and has been promoted to director within Capstone’s business services investment banking group, where he will maintain a focus on the IT services and professional services sectors.

Zahner has been with the firm for over five years and is also based in Denver. He has been promoted to director within Capstone’s industrials investment banking group where he will maintain a focus on the engineered products, flow control and value-added distribution sectors.