Nashville-based AmSurg announced a merger with Denver-based Envision Healthcare last month, forming one of the country’s largest physician staffing companies, along with AmSurg’s continued operation of 250 ambulatory surgery centers and Envision’s national ambulance services. The all-stock deal results in shareholders for Envision holding 53 percent of shares and AmSurg having 47 percent. In combination, the companies represent nearly $9 billion in revenue. Under the merger, which is anticipated to close before the end of 2016, the company will trade under Envision’s symbol of EVHC.

Envision CEO William Sanger will become executive chairman, and AmSurg CEO Chris Holden will be CEO of the combined company. Additionally, AmSurg’s Claire Gulmi has been named CFO of the combined company, while Envision’s CFO Randy Owen will become president of the ambulatory services division. Robert Coward, who was head of the AmSurg/Sheridan business unit, has been named president of the physician services division. The company will maintain co-headquarters in Nashville and Denver.