Here is where each company ranks:
1. United Surgical Partners International (Dallas): 11,000+
2. Surgical Care Affiliates (Deerfield, Ill.): 8,500
3. Surgery Partners (Brentwood, Tenn.): 4,000+
4. HCA Healthcare (Nashville, Tenn.): 3,200
5. ValueHealth (Leawood, Kan.): 3,000+
6. SurgCenter Development (Towson, Md.): 2,200
7. AmSurg (Nashville, Tenn.): 2,000
8. Covenant Physician Partners (Nashville, Tenn.): 1,735
