Kelso & Co. has sold Refresh Mental Health to Optum, according to Axios.

Refresh Mental Health, based in Jacksonville Beach, Fla., is the parent company of mental health practices located throughout the United States. The company states that it has more than 300 locations in 37 states.

Kelso & Co., based in New York, specializes in supporting management buyouts. Founded in 1971, the firm prefers to make more substantial investments in a few targeted sectors, including healthcare.

Optum, based in Eden Prairie, Minn., is the healthcare solutions unit of UnitedHealth Group.