Express Scripts will acquire eviCore healthcare for $3.6 billion from investors including General Atlantic, TA Associates and Ridgemont Equity Partners, according to a news release.

eviCore, headquartered in Bluffton, South Carolina, is a provider of medical benefits management solutions and manages medical benefits for 100 million people, according to the company.

Express Scripts, headquartered in St. Louis, is a provider of integrated pharmacy benefit management services. The company also distributes biopharmaceutical products and provides cost-management and patient-care services.

The transaction is expected to close in the fourth quarter of 2017.