Top 100 Contractors in NAICS 621: Ambulatory Health Care Services, FY2021

Name: Top 100 Contractors in NAICS 621: Ambulatory Health Care Services, FY2021
Creator: GovTribe

Parent companies by net contract obligations Oct 1, 2020 – Sep 30, 2021 Code page on GovTribe

The top 10 won 64% of FY2021 NAICS 621 contract dollars

Contract obligations: $10,933,824,748 Net of deobligations, by contracts coded NAICS 621 or a code under it
Contractors: 2,729 Parent companies with an obligation
Largest contractor: Triwest Healthcare Alliance Corp $3.06 billion, 26.4% of obligations
Data as of: Oct 14, 2026

Contract actions from FPDS (SAM.gov). How the rankings work · Download all 100 rows as CSV

Full ranking

Rank	Contractor	Net obligations	Share	Trend
1	Triwest Healthcare Alliance Corp Top agencies VA (Department of Veterans Affairs)	$3,060,265,853	26.4%	Rank history: #15 in FY2022, #23 in FY2023 and not on the FY2024–FY2025 lists; unchanged since FY2020.
2	Walgreen Co. Top agencies HHS (Department of Health and Human Services)	$899,013,416	7.7%	Rank history: #1 in FY2022 and not on the FY2023–FY2025 lists; up 11 since FY2020.
3	Leidos Holdings, Inc. Through QTC Medical Services Inc. Top agencies VA (Department of Veterans Affairs) DHA (Defense Health Agency) DOJ (Department of Justice)	$876,507,818	7.5%	Rank history: #2 in FY2022, #1 in FY2023, #1 in FY2024 and #1 in FY2025; down 1 since FY2020.
4	UnitedHealth Group Incorporated Through Optumserve Health Services, Inc. Top agencies VA (Department of Veterans Affairs) DHA (Defense Health Agency) Army (Department of the Army)	$604,627,175	5.2%	Rank history: #3 in FY2022, #2 in FY2023, #2 in FY2024 and #2 in FY2025; unchanged since FY2020.
5	American Medical Response Inc. 27 awardees, including Life Line Ambulance Service, Inc., American Medical Response West and Abbott Ambulance, Inc. Top agencies DHS (Department of Homeland Security) VA (Department of Veterans Affairs) USAF (Department of the Air Force)	$386,533,751	3.3%	Rank history: #11 in FY2022, not on the FY2023 list, #7 in FY2024 and #10 in FY2025; up 1 since FY2020.
6	Rite Aid Corporation Through Rite Aid Hdqtrs. Corp. Top agencies HHS (Department of Health and Human Services)	$376,079,968	3.2%	Rank history: #12 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
7	E3Health Solutions, LLC Top agencies HHS (Department of Health and Human Services)	$375,405,960	3.2%	Rank history: #27 in FY2022 and not on the FY2023–FY2025 lists; up 1 since FY2020.
8	Veterans Evaluation Services, Inc. Top agencies VA (Department of Veterans Affairs)	$297,000,000	2.6%	Rank history: not on the FY2022–FY2023 lists, #3 in FY2024 and not on the FY2025 list; down 5 since FY2020.
9	Davita Inc. 7 awardees, including Renal Treatment Centers-West, Inc., DVA Renal Healthcare Inc. and Total Renal Care, Inc. Top agencies VA (Department of Veterans Affairs) DOJ (Department of Justice) USAF (Department of the Air Force)	$283,395,891	2.4%	Rank history: #7 in FY2022, #5 in FY2023, not on the FY2024 list and #6 in FY2025; down 4 since FY2020.
10	Fresenius USA Inc. 6 awardees, including Fresenius Medical Care Holdings Inc., Bio-Medical Applications of Louisiana, LLC and Bio-Medical Applications of Maryland, Inc. Top agencies VA (Department of Veterans Affairs) DOJ (Department of Justice)	$276,883,966	2.4%	Rank history: #6 in FY2022 and not on the FY2023–FY2025 lists; down 3 since FY2020.
11	Maximus Inc. Through Veterans Evaluation Services, Inc. Top agencies VA (Department of Veterans Affairs)	$225,204,497	1.9%	Rank history: #4 in FY2022, #3 in FY2023, #4 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
12	Laboratory Corporation of America Holdings 11 awardees, including Laboratory Corporation of America, Monogram Biosciences, Inc. and Esoterix Genetic Laboratories LLC Top agencies HHS (Department of Health and Human Services) VA (Department of Veterans Affairs) DHA (Defense Health Agency)	$206,117,828	1.8%	Rank history: #10 in FY2022, #26 in FY2023 and not on the FY2024–FY2025 lists; up 3 since FY2020.
13	Quest Diagnostics Incorporated 10 awardees, including Quest Diagnostics Nichols Institute, Quest Diagnostics Clinical Laboratories, Inc. and Ameripath Inc. Top agencies VA (Department of Veterans Affairs) HHS (Department of Health and Human Services) DOJ (Department of Justice)	$165,814,119	1.4%	Rank history: #8 in FY2022, #7 in FY2023, #10 in FY2024 and #12 in FY2025; down 3 since FY2020.
14	STG International, Inc. Top agencies DHS (Department of Homeland Security) VA (Department of Veterans Affairs) HHS (Department of Health and Human Services)	$154,636,718	1.3%	Rank history: #9 in FY2022, #6 in FY2023, #6 in FY2024 and #11 in FY2025; down 5 since FY2020.
15	Hologic, Inc. 2 awardees, including Hologic Sales and Service, LLC Top agencies USAF (Department of the Air Force) VA (Department of Veterans Affairs) Army (Department of the Army)	$119,679,505	1.0%	Rank history: not on the FY2022–FY2025 lists; up 61 since FY2020.
16	Kbr, Inc. Through KBR Wyle Services, LLC Top agencies USSOCOM (United States Special Operations Command)	$93,702,420	0.8%	Rank history: #16 in FY2022, #11 in FY2023, #28 in FY2024 and not on the FY2025 list; down 2 since FY2020.
17	Sterling Medical Corporation 2 awardees, including Sterling Medical Associates, Inc. Top agencies VA (Department of Veterans Affairs) USAF (Department of the Air Force) Army (Department of the Army)	$72,598,578	0.6%	Rank history: #23 in FY2022, #14 in FY2023, #13 in FY2024 and not on the FY2025 list; up 5 since FY2020.
18	CVS Health Corporation 2 awardees, including Minuteclinic, L.L.C. and Coram LLC Top agencies HHS (Department of Health and Human Services) EOP (Executive Office of the President)	$71,705,948	0.6%	Rank history: #5 in FY2022, #9 in FY2023, #30 in FY2024 and not on the FY2025 list; up 5 since FY2020.
19	Team Health Inc. 2 awardees, including Spectrum Healthcare Resources, Inc. and Spectrum Federal Solutions LLC Top agencies DHA (Defense Health Agency) HHS (Department of Health and Human Services) Navy (Department of the Navy)	$67,420,082	0.6%	Rank history: #17 in FY2022, #15 in FY2023, #45 in FY2024 and not on the FY2025 list; down 7 since FY2020.
20	Crassociates, Inc. 2 awardees, including Medmark Veteran Services LLC Top agencies VA (Department of Veterans Affairs)	$67,346,685	0.6%	Rank history: #54 in FY2022, not on the FY2023–FY2024 lists and #47 in FY2025; down 2 since FY2020.
21	Tcfii Valor Buyer LLC 3 awardees, including Valor Healthcare Inc. Top agencies VA (Department of Veterans Affairs)	$54,709,358	0.5%	Rank history: #21 in FY2022, #10 in FY2023, #8 in FY2024 and not on the FY2025 list; down 2 since FY2020.
22	Aegis Sciences Corporation 2 awardees Top agencies HHS (Department of Health and Human Services)	$44,824,646	0.4%	Rank history: #95 in FY2022 and not on the FY2023–FY2025 lists; up 66 since FY2020.
23	The Broad Institute, Inc. 2 awardees Top agencies HHS (Department of Health and Human Services)	$42,154,919	0.4%	Rank history: not on the FY2022–FY2025 lists; up 111 since FY2020.
24	Fulgent Genetics, Inc. Through Fulgent Therapeutics LLC Top agencies HHS (Department of Health and Human Services) DHS (Department of Homeland Security)	$33,178,837	0.3%	Rank history: #98 in FY2022, not on the FY2023–FY2024 lists and #87 in FY2025; up 102 since FY2020.
25	National Marrow Donor Program Top agencies HHS (Department of Health and Human Services) VA (Department of Veterans Affairs)	$30,163,512	0.3%	Rank history: not on the FY2022–FY2025 lists; up 5 since FY2020.
26	The Chenega Corporation 6 awardees, including Chenega Tri-Services, LLC, Chenega Healthcare Services LLC and Chenega Reliable Services LLC Top agencies Army (Department of the Army) DOE (Department of Energy) Commerce (Department of Commerce)	$29,486,536	0.3%	Rank history: #28 in FY2022, #19 in FY2023, #32 in FY2024 and not on the FY2025 list; up 2 since FY2020.
27	Dialysis Clinic, Inc. Top agencies VA (Department of Veterans Affairs)	$28,033,984	0.2%	Rank history: #30 in FY2022, #24 in FY2023 and not on the FY2024–FY2025 lists; unchanged since FY2020.
28	Loma Linda University 2 awardees, including Loma Linda University Medical Center Top agencies VA (Department of Veterans Affairs)	$27,831,522	0.2%	Rank history: not on the FY2022–FY2025 lists; up 21 since FY2020.
29	CHS Middle East LLC Through Acuity-Chs, LLC Top agencies DHS (Department of Homeland Security) DOI (Department of the Interior) DHRA (Defense Human Resources Activity)	$27,594,813	0.2%	Rank history: #41 in FY2022, #35 in FY2023 and not on the FY2024–FY2025 lists; up 137 since FY2020.
30	Icahn School of Medicine at Mount Sinai 2 awardees, including Mount Sinai Hospital Top agencies HHS (Department of Health and Human Services) VA (Department of Veterans Affairs)	$27,166,866	0.2%	Rank history: #40 in FY2022, #20 in FY2023, #14 in FY2024 and not on the FY2025 list; up 446 since FY2020.
31	First Nations Community Health Source Inc. Top agencies HHS (Department of Health and Human Services)	$26,672,487	0.2%	Rank history: not on the FY2022–FY2025 lists; up 35 since FY2020.
32	Wellness Coaches USA LLC Top agencies DHS (Department of Homeland Security)	$23,135,080	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
33	Valor Healthcare Inc. Top agencies VA (Department of Veterans Affairs)	$23,098,287	0.2%	Rank history: #13 in FY2022, #22 in FY2023, #44 in FY2024 and #7 in FY2025; new, not ranked in FY2020.
34	Medmark Veteran Services LLC Top agencies VA (Department of Veterans Affairs)	$23,087,072	0.2%	Rank history: not on the FY2022–FY2025 lists; up 7 since FY2020.
35	The American National Red Cross 2 awardees Top agencies VA (Department of Veterans Affairs) HHS (Department of Health and Human Services) DHA (Defense Health Agency)	$22,953,110	0.2%	Rank history: #32 in FY2022, #29 in FY2023, #27 in FY2024 and #39 in FY2025; up 2 since FY2020.
36	Vesa Health & Technology Inc. Top agencies DHS (Department of Homeland Security) USAF (Department of the Air Force) VA (Department of Veterans Affairs)	$22,747,877	0.2%	Rank history: #46 in FY2022, #53 in FY2023, #74 in FY2024 and not on the FY2025 list; down 1 since FY2020.
37	US Renal Care Inc. 2 awardees, including Dialysis Newco, LLC Top agencies VA (Department of Veterans Affairs)	$22,076,645	0.2%	Rank history: #35 in FY2022, #30 in FY2023, not on the FY2024 list and #14 in FY2025; down 5 since FY2020.
38	Center for Disease Detection, LLC Top agencies Navy (Department of the Navy) Army (Department of the Army)	$21,825,078	0.2%	Rank history: not on the FY2022–FY2025 lists; up 1 since FY2020.
39	American Renal Associates LLC Top agencies VA (Department of Veterans Affairs)	$21,589,756	0.2%	Rank history: not on the FY2022–FY2024 lists and #13 in FY2025; new, not ranked in FY2020.
40	Roche Holding AG Through Foundation Medicine, Inc. Top agencies VA (Department of Veterans Affairs)	$21,583,687	0.2%	Rank history: #37 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
41	Primary Care Solutions Inc. Top agencies VA (Department of Veterans Affairs)	$21,278,752	0.2%	Rank history: #29 in FY2022, #25 in FY2023, #26 in FY2024 and #25 in FY2025; up 12 since FY2020.
42	STS Solutions and Training, LLC Top agencies Army (Department of the Army) DHA (Defense Health Agency)	$20,449,152	0.2%	Rank history: #53 in FY2022, #42 in FY2023, #82 in FY2024 and not on the FY2025 list; up 6 since FY2020.
43	Giacare & Medtrust JV LLC Top agencies Army (Department of the Army)	$20,278,677	0.2%	Rank history: #20 in FY2022, #31 in FY2023, #22 in FY2024 and #27 in FY2025; down 22 since FY2020.
44	Marshfield Clinic Health System, Inc. 2 awardees, including Marshfield Clinic, Inc. Top agencies HHS (Department of Health and Human Services)	$20,219,377	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
45	Complete Mobile Dentistry, Inc. Top agencies Army (Department of the Army) HHS (Department of Health and Human Services)	$18,497,071	0.2%	Rank history: #22 in FY2022, #21 in FY2023 and not on the FY2024–FY2025 lists; down 16 since FY2020.
46	Laboratory Corporation of America Top agencies HHS (Department of Health and Human Services) DHA (Defense Health Agency) USAF (Department of the Air Force)	$17,094,420	0.1%	Rank history: #31 in FY2022, #8 in FY2023, #9 in FY2024 and #8 in FY2025; down 22 since FY2020.
47	Texas Native Health Top agencies HHS (Department of Health and Human Services)	$16,995,055	0.1%	Rank history: not on the FY2022 list, #92 in FY2023 and not on the FY2024–FY2025 lists; up 61 since FY2020.
48	Indian Health Care Resource Center of Tulsa, Inc. Top agencies HHS (Department of Health and Human Services)	$16,850,168	0.1%	Rank history: #66 in FY2022, #91 in FY2023 and not on the FY2024–FY2025 lists; up 20 since FY2020.
49	Rotech Healthcare Inc. Top agencies VA (Department of Veterans Affairs)	$16,411,972	0.1%	Rank history: not on the FY2022 list, #55 in FY2023, #71 in FY2024 and #100 in FY2025; down 9 since FY2020.
50	New York City Health and Hospitals Corporation Top agencies HHS (Department of Health and Human Services)	$15,787,349	0.1%	Rank history: #56 in FY2022, #28 in FY2023, #19 in FY2024 and #22 in FY2025; down 7 since FY2020.
51	Helix Opco LLC Top agencies HHS (Department of Health and Human Services)	$15,585,290	0.1%	Rank history: #18 in FY2022, #17 in FY2023 and not on the FY2024–FY2025 lists; down 26 since FY2020.
52	Spectrum Healthcare Resources Incorporated Top agencies HHS (Department of Health and Human Services)	$15,223,361	0.1%	Rank history: #92 in FY2022 and not on the FY2023–FY2025 lists; down 14 since FY2020.
53	Loyal Source Government Services LLC Top agencies USAF (Department of the Air Force) VA (Department of Veterans Affairs)	$14,037,407	0.1%	Rank history: #24 in FY2022, #12 in FY2023, #5 in FY2024 and #4 in FY2025; new, not ranked in FY2020.
54	Denver Indian Health and Family Services, Inc. Top agencies HHS (Department of Health and Human Services)	$13,974,372	0.1%	Rank history: not on the FY2022–FY2025 lists; up 74 since FY2020.
55	Avosys Technology, Inc. Top agencies USAF (Department of the Air Force) DHA (Defense Health Agency)	$13,738,547	0.1%	Rank history: #62 in FY2022, #38 in FY2023, #72 in FY2024 and #64 in FY2025; down 9 since FY2020.
56	The Research Foundation for the State University of New York Top agencies HHS (Department of Health and Human Services)	$13,355,841	0.1%	Rank history: #78 in FY2022, #40 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
57	South Dakota Urban Indian Health, Inc. (Sduih) Top agencies HHS (Department of Health and Human Services)	$13,249,847	0.1%	Rank history: not on the FY2022–FY2025 lists; up 128 since FY2020.
58	San Diego American Indian Health Center Top agencies HHS (Department of Health and Human Services)	$13,195,490	0.1%	Rank history: not on the FY2022–FY2025 lists; up 75 since FY2020.
59	Acadian Ambulance Service Inc. 3 awardees, including Acadian Ambulance Service of Tennessee, LLC and Acadian Ambulance Service of Texas, LLC Top agencies VA (Department of Veterans Affairs) DHS (Department of Homeland Security) DOJ (Department of Justice)	$11,507,435	0.1%	Rank history: #59 in FY2022, #75 in FY2023, #68 in FY2024 and not on the FY2025 list; up 37 since FY2020.
60	Centene Corporation Through Health Net Federal Services, LLC Top agencies VA (Department of Veterans Affairs)	$10,953,263	0.1%	Rank history: not on the FY2022–FY2025 lists; up 83 since FY2020.
61	Wisestaff, LLC Top agencies Army (Department of the Army) VA (Department of Veterans Affairs)	$10,905,616	0.1%	Rank history: #42 in FY2022, #76 in FY2023, #54 in FY2024 and #53 in FY2025; up 149 since FY2020.
62	United Medevac Solutions, Inc. Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$10,771,782	0.1%	Rank history: #61 in FY2022, #57 in FY2023, #66 in FY2024 and #98 in FY2025; down 10 since FY2020.
63	New York City of Through City of New York Fire Department Top agencies HHS (Department of Health and Human Services)	$10,680,880	0.1%	Rank history: #75 in FY2022, #51 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
64	Mayo Clinic 4 awardees, including Mayo Collaborative Services, Inc. and Mayo Clinic Ambulance Top agencies DHA (Defense Health Agency) VA (Department of Veterans Affairs) HHS (Department of Health and Human Services)	$10,656,997	0.1%	Rank history: #82 in FY2022, #65 in FY2023 and not on the FY2024–FY2025 lists; up 49 since FY2020.
65	Miraca Holdings Inc. Through Srl, Inc. Top agencies USAF (Department of the Air Force) DHA (Defense Health Agency)	$10,523,830	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
66	Genbody Inc. Top agencies HHS (Department of Health and Human Services)	$10,295,000	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
67	White Stone Spectrum Healthcare Resources LLC Top agencies VA (Department of Veterans Affairs)	$10,292,227	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
68	Sacramento Native American Health Center Inc. Top agencies HHS (Department of Health and Human Services)	$10,087,321	0.1%	Rank history: not on the FY2022–FY2025 lists; up 87 since FY2020.
69	Eagle Global Scientific, LLC Top agencies HHS (Department of Health and Human Services) Army (Department of the Army)	$9,986,494	0.1%	Rank history: not on the FY2022–FY2025 lists; up 70 since FY2020.
70	Integrated Medical Solutions, LLC Top agencies DOJ (Department of Justice)	$9,747,945	0.1%	Rank history: not on the FY2022–FY2025 lists; up 3 since FY2020.
71	Prairie Quest, Inc. Top agencies USAF (Department of the Air Force) DHA (Defense Health Agency)	$9,745,764	0.1%	Rank history: #72 in FY2022, #58 in FY2023, #50 in FY2024 and #54 in FY2025; down 10 since FY2020.
72	Cognito Systems LLC Top agencies Army (Department of the Army)	$9,561,060	0.1%	Rank history: #58 in FY2022, #48 in FY2023, #37 in FY2024 and #35 in FY2025; new, not ranked in FY2020.
73	Medshore Ambulance Service Inc. Top agencies VA (Department of Veterans Affairs)	$9,299,000	0.1%	Rank history: not on the FY2022 list, #69 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
74	Valor Network, Inc. Top agencies Army (Department of the Army) DHS (Department of Homeland Security) DHA (Defense Health Agency)	$9,298,757	0.1%	Rank history: #52 in FY2022, #47 in FY2023, #38 in FY2024 and #37 in FY2025; up 17 since FY2020.
75	Native American Health Center, Inc. Top agencies HHS (Department of Health and Human Services)	$9,213,440	0.1%	Rank history: not on the FY2022–FY2025 lists; up 86 since FY2020.
76	Oregon Health & Science University Top agencies VA (Department of Veterans Affairs) HHS (Department of Health and Human Services)	$9,025,169	0.1%	Rank history: not on the FY2022 list, #54 in FY2023, #76 in FY2024 and not on the FY2025 list; up 3 since FY2020.
77	AB Staffing Solutions LLC Top agencies HHS (Department of Health and Human Services)	$8,922,417	0.1%	Rank history: #48 in FY2022, #100 in FY2023 and not on the FY2024–FY2025 lists; up 59 since FY2020.
78	Dilligas Corp Top agencies VA (Department of Veterans Affairs) USAF (Department of the Air Force) DHA (Defense Health Agency)	$8,863,944	0.1%	Rank history: #57 in FY2022 and not on the FY2023–FY2025 lists; up 38 since FY2020.
79	Home Care Equipment, Inc. Top agencies VA (Department of Veterans Affairs)	$8,623,411	0.1%	Rank history: #45 in FY2022, #68 in FY2023 and not on the FY2024–FY2025 lists; down 37 since FY2020.
80	Empowered Management Solutions LLC Top agencies DHA (Defense Health Agency) USAF (Department of the Air Force)	$8,599,403	0.1%	Rank history: #71 in FY2022, #93 in FY2023, #94 in FY2024 and not on the FY2025 list; down 20 since FY2020.
81	Mid-Cities Home Medical Delivery Service, L.L.C. Top agencies VA (Department of Veterans Affairs)	$8,478,143	0.1%	Rank history: #81 in FY2022, #60 in FY2023, #49 in FY2024 and not on the FY2025 list; up 5 since FY2020.
82	University of Utah 2 awardees, including Arup Laboratories Inc. Top agencies VA (Department of Veterans Affairs) HHS (Department of Health and Human Services) Army (Department of the Army)	$8,353,705	0.1%	Rank history: #76 in FY2022, #62 in FY2023 and not on the FY2024–FY2025 lists; up 19 since FY2020.
83	Central Oklahoma American Indian Health Council, Inc. Top agencies HHS (Department of Health and Human Services)	$8,252,503	0.1%	Rank history: #39 in FY2022, #86 in FY2023 and not on the FY2024–FY2025 lists; down 27 since FY2020.
84	MCI Diagnostic Center LLC Top agencies DOL (Department of Labor) Army (Department of the Army) USAF (Department of the Air Force)	$8,204,594	0.1%	Rank history: #91 in FY2022 and not on the FY2023–FY2025 lists; down 37 since FY2020.
85	Reef Systems Corp Top agencies USAF (Department of the Air Force) Army (Department of the Army)	$8,119,084	0.1%	Rank history: #89 in FY2022 and not on the FY2023–FY2025 lists; down 22 since FY2020.
86	Exact Sciences Corporation 2 awardees, including Genomic Health, Inc. Top agencies VA (Department of Veterans Affairs) Army (Department of the Army) DHA (Defense Health Agency)	$8,109,385	0.1%	Rank history: not on the FY2022–FY2025 lists; up 116 since FY2020.
87	Front Line Ems LLC Top agencies HHS (Department of Health and Human Services) USDA (Department of Agriculture)	$8,093,813	0.1%	Rank history: #84 in FY2022 and not on the FY2023–FY2025 lists; up 162 since FY2020.
88	Nebraska Urban Indian Health C Through Nebraska Urban Indian Health Coalition, Inc. Top agencies HHS (Department of Health and Human Services)	$8,055,428	0.1%	Rank history: not on the FY2022–FY2025 lists; up 240 since FY2020.
89	Servefed Inc. Top agencies HHS (Department of Health and Human Services) NASA (National Aeronautics and Space Administration) USAF (Department of the Air Force)	$8,048,121	0.1%	Rank history: #34 in FY2022, #32 in FY2023, #23 in FY2024 and #26 in FY2025; down 34 since FY2020.
90	Indian Health Center of Santa Clara Valley Top agencies HHS (Department of Health and Human Services)	$8,031,640	0.1%	Rank history: not on the FY2022–FY2025 lists; up 89 since FY2020.
91	LMR Technical Group LLC Top agencies USAF (Department of the Air Force)	$8,004,537	0.1%	Rank history: #70 in FY2022, #81 in FY2023, #77 in FY2024 and #36 in FY2025; down 6 since FY2020.
92	The Tatitlek Corporation Through Tatitlek Federal Services LLC Top agencies Army (Department of the Army)	$7,933,377	0.1%	Rank history: not on the FY2022–FY2025 lists; down 28 since FY2020.
93	Destiny Management Services, LLC Top agencies DHA (Defense Health Agency) USAF (Department of the Air Force)	$7,782,766	0.1%	Rank history: #96 in FY2022, #46 in FY2023, #41 in FY2024 and #58 in FY2025; down 15 since FY2020.
94	CS Holding Inc. Through CG Services LLC Top agencies DHA (Defense Health Agency)	$7,645,620	0.1%	Rank history: not on the FY2022 list, #67 in FY2023, #58 in FY2024 and not on the FY2025 list; down 22 since FY2020.
95	Opko Health, Inc. 2 awardees, including Bioreference Health LLC and Genedx, LLC Top agencies HHS (Department of Health and Human Services) VA (Department of Veterans Affairs)	$7,471,201	0.1%	Rank history: not on the FY2022–FY2025 lists; up 121 since FY2020.
96	T3I, Inc. Top agencies USAF (Department of the Air Force)	$7,467,000	0.1%	Rank history: not on the FY2022 list, #80 in FY2023, #70 in FY2024 and #69 in FY2025; down 16 since FY2020.
97	Pathologists BIO Medical Lab 2 awardees, including Associated Pathologists, LLC and Pathologists Bio-Medical Laboratories, PLLC Top agencies HHS (Department of Health and Human Services) VA (Department of Veterans Affairs)	$7,313,625	0.1%	Rank history: not on the FY2022–FY2025 lists; down 14 since FY2020.
98	Bloodworks Top agencies VA (Department of Veterans Affairs) Army (Department of the Army) HHS (Department of Health and Human Services)	$7,186,916	0.1%	Rank history: not on the FY2022–FY2024 lists and #97 in FY2025; up 8 since FY2020.
99	Excelsior Ambulance Service Inc. Top agencies VA (Department of Veterans Affairs)	$7,146,319	0.1%	Rank history: #50 in FY2022, #37 in FY2023, #35 in FY2024 and #33 in FY2025; up 26 since FY2020.
100	Fresno American Indian Health Project Top agencies HHS (Department of Health and Human Services)	$7,112,396	0.1%	Rank history: not on the FY2022–FY2025 lists; up 113 since FY2020.

Show 75 more

100 of 2,729 contractors listed here. See the rest on GovTribe.

Rankings for the codes under NAICS 621

Code	Net obligations	Largest contractor
6211 Offices of Physicians	$5,484,657,733	Triwest Healthcare Alliance Corp
6215 Medical and Diagnostic Laboratories	$2,683,111,719	Walgreen Co.
6214 Outpatient Care Centers	$1,265,709,522	Davita Inc.
6219 Other Ambulatory Health Care Services	$1,065,438,290	American Medical Response Inc.
6213 Offices of Other Health Practitioners	$349,007,016	Kbr, Inc.
6216 Home Health Care Services	$52,836,954	Rotech Healthcare Inc.
6212 Offices of Dentists	$33,063,513	Complete Mobile Dentistry, Inc.

How this ranking works

Source: every contract action FPDS records (as published on SAM.gov) in the period, as GovTribe received it.
Amounts are net obligations: what was obligated, less what was deobligated. Shares are of $11.6 billion obligated before deobligations, so they never pass 100%.
Parent companies: each action counts under the ultimate parent its award record names, or under the awardee when it names none, so no dollar counts twice. Parents of the same name (Inc., LLC and the like aside) count as one company, since FPDS records a company's parent under more than one UEI over time. GovTribe corrects a few parents and names by hand; see the corrections.
Fiscal year 2021 ran Oct 1, 2020 – Sep 30, 2021. The Department of Defense reports its contract actions to FPDS about 90 days late, so a fiscal year is ranked once they're in, in February, and the list doesn't change after.
Rank changes compare with FY2020. "New" marks a company outside that period's top 500, and "Returned" one of those that was on an earlier fiscal year's list.
Rank lines show each company's rank on every fiscal year's list since FY2021, #1 at the top, on a scale that gives the top of the list more room. A dashed stretch spans years it wasn't on the list. The step from FY2020 takes the color of the rank change beside it.
Placeholder recipients FPDS uses when it names no company ("Miscellaneous Foreign Contractors" and the like) aren't ranked.

Quick answers

Who were the top 10 NAICS 621 contractors in FY2021?

1. Triwest Healthcare Alliance Corp ($3.06B), 2. Walgreen Co. ($899M), 3. Leidos Holdings, Inc. ($877M), 4. UnitedHealth Group Incorporated ($605M), 5. American Medical Response Inc. ($387M), 6. Rite Aid Corporation ($376M), 7. E3Health Solutions, LLC ($375M), 8. Veterans Evaluation Services, Inc. ($297M), 9. Davita Inc. ($283M), 10. Fresenius USA Inc. ($277M).

On GovTribe

Research every contractor on this list

Every contract, task order and IDV they hold
Their subsidiaries, teammates and competitors
Open opportunities they're positioned for
Alerts when they win new work

Try for free Login