These were the five largest operators as of Dec. 31, 2018, and the number of centers they had under management:
1. Nashville, Tenn.-based Envision Healthcare (AmSurg): 261
2. Addison, Texas-based United Surgical Partners International: 255
3. Deerfield, Ill.-based Surgical Care Affiliates: 219
4. Nashville-based Surgery Partners: 125
5. Nashville-based HCA Healthcare: 123
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