Top 100 Contractors in NAICS 621: Ambulatory Health Care Services, FY2022

Name: Top 100 Contractors in NAICS 621: Ambulatory Health Care Services, FY2022
Creator: GovTribe

Parent companies by net contract obligations Oct 1, 2021 – Sep 30, 2022 Code page on GovTribe

The top 10 won 48% of FY2022 NAICS 621 contract dollars

Contract obligations: $8,136,931,326 Net of deobligations, by contracts coded NAICS 621 or a code under it
Contractors: 2,585 Parent companies with an obligation
Largest contractor: Walgreen Co. $1.03 billion, 10.0% 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	Walgreen Co. Top agencies HHS (Department of Health and Human Services) EPA (Environmental Protection Agency)	$1,032,812,672	10.0%	Rank history: #2 in FY2021 and not on the FY2023–FY2025 lists; up 1 since FY2021.
2	Leidos Holdings, Inc. Through QTC Medical Services Inc. Top agencies VA (Department of Veterans Affairs) DHS (Department of Homeland Security) HHS (Department of Health and Human Services)	$934,802,242	9.1%	Rank history: #3 in FY2021, #1 in FY2023, #1 in FY2024 and #1 in FY2025; up 1 since FY2021.
3	UnitedHealth Group Incorporated Through Optumserve Health Services, Inc. Top agencies VA (Department of Veterans Affairs) DHA (Defense Health Agency) HHS (Department of Health and Human Services)	$803,861,925	7.8%	Rank history: #4 in FY2021, #2 in FY2023, #2 in FY2024 and #2 in FY2025; up 1 since FY2021.
4	Maximus Inc. Through Veterans Evaluation Services, Inc. Top agencies VA (Department of Veterans Affairs)	$690,607,689	6.7%	Rank history: #11 in FY2021, #3 in FY2023, #4 in FY2024 and not on the FY2025 list; up 7 since FY2021.
5	CVS Health Corporation 3 awardees, including Minuteclinic, L.L.C. and CVS Pharmacy, Inc. Top agencies HHS (Department of Health and Human Services) EOP (Executive Office of the President) EPA (Environmental Protection Agency)	$349,495,604	3.4%	Rank history: #18 in FY2021, #9 in FY2023, #30 in FY2024 and not on the FY2025 list; up 13 since FY2021.
6	Fresenius USA Inc. 8 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)	$289,256,202	2.8%	Rank history: #10 in FY2021 and not on the FY2023–FY2025 lists; up 4 since FY2021.
7	Davita Inc. 5 awardees, including Total Renal Care, Inc., Renal Treatment Centers-West, Inc. and Renal Treatment Centers-Mid-Atlantic Inc. Top agencies VA (Department of Veterans Affairs) USAF (Department of the Air Force)	$282,528,063	2.7%	Rank history: #9 in FY2021, #5 in FY2023, not on the FY2024 list and #6 in FY2025; up 2 since FY2021.
8	Quest Diagnostics Incorporated 11 awardees, including Quest Diagnostics Nichols Institute, Quest Diagnostics Clinical Laboratories, Inc. and Quest Diagnostics of Puerto Rico Inc. Top agencies HHS (Department of Health and Human Services) VA (Department of Veterans Affairs) DOJ (Department of Justice)	$199,318,782	1.9%	Rank history: #13 in FY2021, #7 in FY2023, #10 in FY2024 and #12 in FY2025; up 5 since FY2021.
9	STG International, Inc. Top agencies DHS (Department of Homeland Security) VA (Department of Veterans Affairs) HHS (Department of Health and Human Services)	$191,294,378	1.9%	Rank history: #14 in FY2021, #6 in FY2023, #6 in FY2024 and #11 in FY2025; up 5 since FY2021.
10	Laboratory Corporation of America Holdings 8 awardees, including Laboratory Corporation of America, Center for Disease Detection, LLC and Medtox Laboratories Inc. Top agencies HHS (Department of Health and Human Services) Army (Department of the Army) DHA (Defense Health Agency)	$181,036,616	1.8%	Rank history: #12 in FY2021, #26 in FY2023 and not on the FY2024–FY2025 lists; up 2 since FY2021.
11	American Medical Response Inc. 24 awardees, including Life Line Ambulance Service, Inc., Abbott Ambulance, Inc. and Lifefleet Southeast Inc. Top agencies DHS (Department of Homeland Security) VA (Department of Veterans Affairs) Army (Department of the Army)	$179,641,063	1.7%	Rank history: #5 in FY2021, not on the FY2023 list, #7 in FY2024 and #10 in FY2025; down 6 since FY2021.
12	Rite Aid Corporation Through Rite Aid Hdqtrs. Corp. Top agencies HHS (Department of Health and Human Services)	$138,179,570	1.3%	Rank history: #6 in FY2021 and not on the FY2023–FY2025 lists; down 6 since FY2021.
13	Valor Healthcare Inc. 3 awardees, including Crassociates, Inc. Top agencies VA (Department of Veterans Affairs)	$124,825,790	1.2%	Rank history: #33 in FY2021, #22 in FY2023, #44 in FY2024 and #7 in FY2025; up 20 since FY2021.
14	Longview International Technology Solutions, Inc. Top agencies HHS (Department of Health and Human Services)	$120,112,200	1.2%	Rank history: not on the FY2021 list and not on the FY2023–FY2025 lists; new.
15	Triwest Healthcare Alliance Corp Top agencies VA (Department of Veterans Affairs)	$110,342,006	1.1%	Rank history: #1 in FY2021, #23 in FY2023 and not on the FY2024–FY2025 lists; down 14 since FY2021.
16	Kbr, Inc. 2 awardees, including KBR Wyle Services, LLC Top agencies USSOCOM (United States Special Operations Command)	$104,586,629	1.0%	Rank history: #16 in FY2021, #11 in FY2023, #28 in FY2024 and not on the FY2025 list; unchanged since FY2021.
17	Team Health Inc. 2 awardees, including Spectrum Healthcare Resources, Inc. and Spectrum Federal Solutions LLC Top agencies DHA (Defense Health Agency) Navy (Department of the Navy)	$53,497,342	0.5%	Rank history: #19 in FY2021, #15 in FY2023, #45 in FY2024 and not on the FY2025 list; up 2 since FY2021.
18	Helix Opco LLC Top agencies HHS (Department of Health and Human Services)	$51,352,663	0.5%	Rank history: #51 in FY2021, #17 in FY2023 and not on the FY2024–FY2025 lists; up 33 since FY2021.
19	Ami Expeditionary Healthcare (USA) LLC Top agencies DHS (Department of Homeland Security)	$49,212,617	0.5%	Rank history: not on the FY2021 list, #16 in FY2023 and not on the FY2024–FY2025 lists; new.
20	Giacare & Medtrust JV LLC Top agencies Army (Department of the Army)	$48,974,228	0.5%	Rank history: #43 in FY2021, #31 in FY2023, #22 in FY2024 and #27 in FY2025; up 23 since FY2021.
21	Tcfii Valor Buyer LLC Through Valor Healthcare Inc. Top agencies VA (Department of Veterans Affairs)	$46,839,086	0.5%	Rank history: #21 in FY2021, #10 in FY2023, #8 in FY2024 and not on the FY2025 list; unchanged since FY2021.
22	Complete Mobile Dentistry, Inc. Top agencies Army (Department of the Army) HHS (Department of Health and Human Services)	$39,804,065	0.4%	Rank history: #45 in FY2021, #21 in FY2023 and not on the FY2024–FY2025 lists; up 23 since FY2021.
23	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)	$37,954,730	0.4%	Rank history: #17 in FY2021, #14 in FY2023, #13 in FY2024 and not on the FY2025 list; down 6 since FY2021.
24	Loyal Source Government Services LLC Top agencies VA (Department of Veterans Affairs) USAF (Department of the Air Force)	$36,064,673	0.3%	Rank history: #53 in FY2021, #12 in FY2023, #5 in FY2024 and #4 in FY2025; up 29 since FY2021.
25	International Sos Government Medical Services, Inc. Top agencies Army (Department of the Army)	$31,730,708	0.3%	Rank history: not on the FY2021 list, #13 in FY2023, #16 in FY2024 and not on the FY2025 list; new.
26	Community Blood Center Top agencies HHS (Department of Health and Human Services) VA (Department of Veterans Affairs)	$31,591,020	0.3%	Rank history: not on the FY2021 list, not on the FY2023 list, #20 in FY2024 and not on the FY2025 list; new.
27	E3Health Solutions, LLC Top agencies HHS (Department of Health and Human Services)	$31,371,056	0.3%	Rank history: #7 in FY2021 and not on the FY2023–FY2025 lists; down 20 since FY2021.
28	The Chenega Corporation 6 awardees, including Chenega Tri-Services, LLC, Chenega Reliable Services LLC and Chenega Healthcare Services LLC Top agencies Army (Department of the Army) DOE (Department of Energy) Commerce (Department of Commerce)	$30,818,398	0.3%	Rank history: #26 in FY2021, #19 in FY2023, #32 in FY2024 and not on the FY2025 list; down 2 since FY2021.
29	Primary Care Solutions Inc. Top agencies VA (Department of Veterans Affairs)	$29,341,638	0.3%	Rank history: #41 in FY2021, #25 in FY2023, #26 in FY2024 and #25 in FY2025; up 12 since FY2021.
30	Dialysis Clinic, Inc. Top agencies VA (Department of Veterans Affairs) DOJ (Department of Justice)	$28,579,644	0.3%	Rank history: #27 in FY2021, #24 in FY2023 and not on the FY2024–FY2025 lists; down 3 since FY2021.
31	Laboratory Corporation of America 2 awardees Top agencies HHS (Department of Health and Human Services) DHS (Department of Homeland Security) VA (Department of Veterans Affairs)	$28,367,120	0.3%	Rank history: #46 in FY2021, #8 in FY2023, #9 in FY2024 and #8 in FY2025; up 15 since FY2021.
32	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)	$28,140,931	0.3%	Rank history: #35 in FY2021, #29 in FY2023, #27 in FY2024 and #39 in FY2025; up 3 since FY2021.
33	Native Health Top agencies HHS (Department of Health and Human Services)	$25,838,912	0.3%	Rank history: not on the FY2021 list and not on the FY2023–FY2025 lists; up 181 since FY2021.
34	Servefed Inc. Top agencies HHS (Department of Health and Human Services) NASA (National Aeronautics and Space Administration) USAF (Department of the Air Force)	$25,232,201	0.2%	Rank history: #89 in FY2021, #32 in FY2023, #23 in FY2024 and #26 in FY2025; up 55 since FY2021.
35	US Renal Care Inc. 2 awardees, including Dialysis Newco, LLC Top agencies VA (Department of Veterans Affairs)	$23,439,489	0.2%	Rank history: #37 in FY2021, #30 in FY2023, not on the FY2024 list and #14 in FY2025; up 2 since FY2021.
36	Do Know Harm LLC Top agencies DOS (Department of State)	$23,210,081	0.2%	Rank history: not on the FY2021 list, #39 in FY2023 and not on the FY2024–FY2025 lists; up 329 since FY2021.
37	Roche Holding AG 2 awardees, including Foundation Medicine, Inc. Top agencies VA (Department of Veterans Affairs)	$22,949,826	0.2%	Rank history: #40 in FY2021 and not on the FY2023–FY2025 lists; up 3 since FY2021.
38	American Renal Associates LLC 2 awardees, including University Kidney Center, LLC Top agencies VA (Department of Veterans Affairs)	$22,095,273	0.2%	Rank history: not on the FY2021 list, #33 in FY2023 and not on the FY2024–FY2025 lists; new.
39	Central Oklahoma American Indian Health Council, Inc. Top agencies HHS (Department of Health and Human Services)	$20,907,204	0.2%	Rank history: #83 in FY2021, #86 in FY2023 and not on the FY2024–FY2025 lists; up 44 since FY2021.
40	Icahn School of Medicine at Mount Sinai 2 awardees, including Mount Sinai Hospital Top agencies HHS (Department of Health and Human Services)	$19,879,684	0.2%	Rank history: #30 in FY2021, #20 in FY2023, #14 in FY2024 and not on the FY2025 list; down 10 since FY2021.
41	CHS Middle East LLC Through Acuity-Chs, LLC Top agencies DHS (Department of Homeland Security) DOI (Department of the Interior) WHS (DOD Washington Headquarters Service)	$18,546,215	0.2%	Rank history: #29 in FY2021, #35 in FY2023 and not on the FY2024–FY2025 lists; down 12 since FY2021.
42	Wisestaff, LLC Top agencies Army (Department of the Army)	$18,021,105	0.2%	Rank history: #61 in FY2021, #76 in FY2023, #54 in FY2024 and #53 in FY2025; up 19 since FY2021.
43	Robison Medical Resource Group LLC Top agencies HHS (Department of Health and Human Services) DOJ (Department of Justice)	$17,799,597	0.2%	Rank history: not on the FY2021 list and not on the FY2023–FY2025 lists; up 160 since FY2021.
44	Urban Indian Center of Salt Lake Top agencies HHS (Department of Health and Human Services)	$17,693,448	0.2%	Rank history: not on the FY2021 list and not on the FY2023–FY2025 lists; up 201 since FY2021.
45	Home Care Equipment, Inc. Top agencies VA (Department of Veterans Affairs)	$17,653,596	0.2%	Rank history: #79 in FY2021, #68 in FY2023 and not on the FY2024–FY2025 lists; up 34 since FY2021.
46	Vesa Health & Technology Inc. Top agencies DHS (Department of Homeland Security) USAF (Department of the Air Force)	$16,420,693	0.2%	Rank history: #36 in FY2021, #53 in FY2023, #74 in FY2024 and not on the FY2025 list; down 10 since FY2021.
47	Indian Health Board of Minneapolis, Inc. Top agencies HHS (Department of Health and Human Services)	$16,092,225	0.2%	Rank history: not on the FY2021 list and not on the FY2023–FY2025 lists; up 76 since FY2021.
48	AB Staffing Solutions LLC Top agencies HHS (Department of Health and Human Services) DOI (Department of the Interior)	$15,659,436	0.2%	Rank history: #77 in FY2021, #100 in FY2023 and not on the FY2024–FY2025 lists; up 29 since FY2021.
49	Nexelis Group Inc. Through Laboratories Nexelis Canada Inc. Top agencies HHS (Department of Health and Human Services)	$14,625,365	0.1%	Rank history: not on the FY2021 list and not on the FY2023–FY2025 lists; new.
50	Excelsior Ambulance Service Inc. Top agencies VA (Department of Veterans Affairs)	$14,202,659	0.1%	Rank history: #99 in FY2021, #37 in FY2023, #35 in FY2024 and #33 in FY2025; up 49 since FY2021.
51	Hunter Health Clinic Inc. Top agencies HHS (Department of Health and Human Services)	$14,045,264	0.1%	Rank history: not on the FY2021 list and not on the FY2023–FY2025 lists; up 109 since FY2021.
52	Valor Network, Inc. Top agencies Army (Department of the Army) DHA (Defense Health Agency) DHS (Department of Homeland Security)	$13,387,904	0.1%	Rank history: #74 in FY2021, #47 in FY2023, #38 in FY2024 and #37 in FY2025; up 22 since FY2021.
53	STS Solutions and Training, LLC Top agencies Army (Department of the Army)	$13,218,897	0.1%	Rank history: #42 in FY2021, #42 in FY2023, #82 in FY2024 and not on the FY2025 list; down 11 since FY2021.
54	Crassociates, Inc. 2 awardees, including Medmark Veteran Services LLC Top agencies VA (Department of Veterans Affairs)	$13,169,715	0.1%	Rank history: #20 in FY2021, not on the FY2023–FY2024 lists and #47 in FY2025; down 34 since FY2021.
55	SNA International LLC Top agencies WHS (DOD Washington Headquarters Service)	$12,903,968	0.1%	Rank history: not on the FY2021 list, #43 in FY2023, #36 in FY2024 and #41 in FY2025; new.
56	New York City Health and Hospitals Corporation Top agencies HHS (Department of Health and Human Services)	$12,788,805	0.1%	Rank history: #50 in FY2021, #28 in FY2023, #19 in FY2024 and #22 in FY2025; down 6 since FY2021.
57	Dilligas Corp Top agencies DHA (Defense Health Agency) VA (Department of Veterans Affairs) USAF (Department of the Air Force)	$11,764,594	0.1%	Rank history: #78 in FY2021 and not on the FY2023–FY2025 lists; up 21 since FY2021.
58	Cognito Systems LLC Top agencies Army (Department of the Army)	$11,738,033	0.1%	Rank history: #72 in FY2021, #48 in FY2023, #37 in FY2024 and #35 in FY2025; up 14 since FY2021.
59	Acadian Ambulance Service Inc. 2 awardees, including Acadian Ambulance Service of Tennessee, LLC Top agencies VA (Department of Veterans Affairs) DHS (Department of Homeland Security) DOJ (Department of Justice)	$11,633,894	0.1%	Rank history: #59 in FY2021, #75 in FY2023, #68 in FY2024 and not on the FY2025 list; unchanged since FY2021.
60	Everthingwellness LLC Top agencies Treasury (Department of the Treasury)	$11,502,332	0.1%	Rank history: not on the FY2021 list and not on the FY2023–FY2025 lists; new.
61	United Medevac Solutions, Inc. Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$11,372,067	0.1%	Rank history: #62 in FY2021, #57 in FY2023, #66 in FY2024 and #98 in FY2025; up 1 since FY2021.
62	Avosys Technology, Inc. Top agencies USAF (Department of the Air Force) DHA (Defense Health Agency)	$11,043,202	0.1%	Rank history: #55 in FY2021, #38 in FY2023, #72 in FY2024 and #64 in FY2025; down 7 since FY2021.
63	University of Texas System 6 awardees, including The Univeristy of Texas M.d. Anderson Cancer Center, The University of Texas Health Science Center At San Antonio and The University of Texas Southwestern Medical Center Top agencies HHS (Department of Health and Human Services) VA (Department of Veterans Affairs) Army (Department of the Army)	$10,867,816	0.1%	Rank history: not on the FY2021 list, #61 in FY2023 and not on the FY2024–FY2025 lists; up 80 since FY2021.
64	Potomac Valor Healthcare 2, LLC Top agencies VA (Department of Veterans Affairs)	$10,781,484	0.1%	Rank history: not on the FY2021 list, not on the FY2023 list, #33 in FY2024 and #50 in FY2025; new.
65	Sterling Medical Associates, Inc. Top agencies VA (Department of Veterans Affairs) Army (Department of the Army) USAF (Department of the Air Force)	$10,524,247	0.1%	Rank history: not on the FY2021 list, not on the FY2023–FY2024 lists and #24 in FY2025; new.
66	Indian Health Care Resource Center of Tulsa, Inc. Top agencies HHS (Department of Health and Human Services)	$10,198,012	0.1%	Rank history: #48 in FY2021, #91 in FY2023 and not on the FY2024–FY2025 lists; down 18 since FY2021.
67	Koniag, Inc. 3 awardees, including Kadiak LLC and Koniag Information Security Services LLC Top agencies DHS (Department of Homeland Security) Treasury (Department of the Treasury)	$9,873,225	0.1%	Rank history: not on the FY2021 list, #78 in FY2023, not on the FY2024 list and #77 in FY2025; up 37 since FY2021.
68	Dawson Cms, LLC Top agencies DHA (Defense Health Agency)	$9,868,636	0.1%	Rank history: not on the FY2021 list, #49 in FY2023, #29 in FY2024 and #19 in FY2025; new.
69	Medforce Government Solutions, Inc. Top agencies DHA (Defense Health Agency) Army (Department of the Army) USAF (Department of the Air Force)	$9,772,879	0.1%	Rank history: not on the FY2021 list, #85 in FY2023 and not on the FY2024–FY2025 lists; up 32 since FY2021.
70	LMR Technical Group LLC Top agencies USAF (Department of the Air Force)	$9,755,697	0.1%	Rank history: #91 in FY2021, #81 in FY2023, #77 in FY2024 and #36 in FY2025; up 21 since FY2021.
71	Empowered Management Solutions LLC Top agencies DHA (Defense Health Agency) USAF (Department of the Air Force)	$9,400,473	0.1%	Rank history: #80 in FY2021, #93 in FY2023, #94 in FY2024 and not on the FY2025 list; up 9 since FY2021.
72	Prairie Quest, Inc. Top agencies DHA (Defense Health Agency) USAF (Department of the Air Force)	$9,355,332	0.1%	Rank history: #71 in FY2021, #58 in FY2023, #50 in FY2024 and #54 in FY2025; down 1 since FY2021.
73	Duke University 2 awardees Top agencies HHS (Department of Health and Human Services)	$9,288,345	0.1%	Rank history: not on the FY2021 list, #89 in FY2023 and not on the FY2024–FY2025 lists; up 39 since FY2021.
74	Eagle Health, LLC Top agencies HHS (Department of Health and Human Services) Army (Department of the Army) DHS (Department of Homeland Security)	$9,261,944	0.1%	Rank history: not on the FY2021 list, #90 in FY2023 and not on the FY2024–FY2025 lists; up 29 since FY2021.
75	New York City of Through City of New York Fire Department Top agencies HHS (Department of Health and Human Services)	$9,234,038	0.1%	Rank history: #63 in FY2021, #51 in FY2023 and not on the FY2024–FY2025 lists; down 12 since FY2021.
76	University of Utah 2 awardees, including Arup Laboratories Inc. Top agencies VA (Department of Veterans Affairs) HHS (Department of Health and Human Services) DHA (Defense Health Agency)	$9,153,437	0.1%	Rank history: #82 in FY2021, #62 in FY2023 and not on the FY2024–FY2025 lists; up 6 since FY2021.
77	The Henry M. Jackson Foundation for the Advancement of Military Medicine, Inc. Top agencies Army (Department of the Army)	$8,991,855	0.1%	Rank history: not on the FY2021 list, #59 in FY2023, not on the FY2024 list and #55 in FY2025; up 28 since FY2021.
78	The Research Foundation for the State University of New York Top agencies HHS (Department of Health and Human Services)	$8,991,736	0.1%	Rank history: #56 in FY2021, #40 in FY2023 and not on the FY2024–FY2025 lists; down 22 since FY2021.
79	Wesley Medical Staffing, Inc. Top agencies HHS (Department of Health and Human Services)	$8,700,374	0.1%	Rank history: not on the FY2021 list and not on the FY2023–FY2025 lists; up 131 since FY2021.
80	Jan-Care Ambulance of North Central W.va., Inc. Top agencies VA (Department of Veterans Affairs)	$8,650,793	0.1%	Rank history: not on the FY2021 list, #84 in FY2023, #81 in FY2024 and #61 in FY2025; up 26 since FY2021.
81	Mid-Cities Home Medical Delivery Service, L.L.C. Top agencies VA (Department of Veterans Affairs)	$8,571,023	0.1%	Rank history: #81 in FY2021, #60 in FY2023, #49 in FY2024 and not on the FY2025 list; unchanged since FY2021.
82	Mayo Clinic 3 awardees, including Mayo Collaborative Services, Inc., Mayo Clinic Ambulance and Mayo Clinic Arizona Top agencies HHS (Department of Health and Human Services) VA (Department of Veterans Affairs)	$8,369,772	0.1%	Rank history: #64 in FY2021, #65 in FY2023 and not on the FY2024–FY2025 lists; down 18 since FY2021.
83	Reliance Medical Transport, LLC Top agencies VA (Department of Veterans Affairs)	$8,347,679	0.1%	Rank history: not on the FY2021 list, #41 in FY2023, #52 in FY2024 and #44 in FY2025; up 87 since FY2021.
84	Front Line Ems LLC Top agencies HHS (Department of Health and Human Services) USDA (Department of Agriculture)	$8,173,266	0.1%	Rank history: #87 in FY2021 and not on the FY2023–FY2025 lists; up 3 since FY2021.
85	American Indian Health Service of Chicago Top agencies HHS (Department of Health and Human Services)	$7,852,939	0.1%	Rank history: not on the FY2021 list and not on the FY2023–FY2025 lists; up 248 since FY2021.
86	Abbott Laboratories 6 awardees, including Pembrooke Occupational Health, Inc., Alere Toxicology Services, Inc. and Redwood Toxicology Laboratory, Inc. Top agencies OSD (Office of the Secretary of Defense) DOI (Department of the Interior) DOJ (Department of Justice)	$7,825,715	0.1%	Rank history: not on the FY2021 list, #71 in FY2023 and not on the FY2024–FY2025 lists; up 35 since FY2021.
87	Prairie Band Health Services Inc. Top agencies HHS (Department of Health and Human Services)	$7,793,830	0.1%	Rank history: not on the FY2021 list, #87 in FY2023, #42 in FY2024 and #38 in FY2025; up 128 since FY2021.
88	Health Partner's Management Group, Incorporated Top agencies USAF (Department of the Air Force) DHA (Defense Health Agency)	$7,786,006	0.1%	Rank history: not on the FY2021 list, #56 in FY2023, #51 in FY2024 and #49 in FY2025; up 14 since FY2021.
89	Reef Systems Corp Top agencies USAF (Department of the Air Force) Army (Department of the Army)	$7,642,289	0.1%	Rank history: #85 in FY2021 and not on the FY2023–FY2025 lists; down 4 since FY2021.
90	Rutgers, the State University 3 awardees, including Rutgers the State University of New Jersey Top agencies HHS (Department of Health and Human Services)	$7,409,842	0.1%	Rank history: not on the FY2021 list and not on the FY2023–FY2025 lists; up 72 since FY2021.
91	MCI Diagnostic Center LLC Top agencies DOL (Department of Labor) Army (Department of the Army) USAF (Department of the Air Force)	$7,355,362	0.1%	Rank history: #84 in FY2021 and not on the FY2023–FY2025 lists; down 7 since FY2021.
92	Spectrum Healthcare Resources Incorporated Top agencies HHS (Department of Health and Human Services)	$7,276,114	0.1%	Rank history: #52 in FY2021 and not on the FY2023–FY2025 lists; down 40 since FY2021.
93	Northwell Health, Inc. 2 awardees, including North Shore University Hospital Top agencies DOT (Department of Transportation) HHS (Department of Health and Human Services)	$7,137,011	0.1%	Rank history: not on the FY2021 list, not on the FY2023 list, #63 in FY2024 and #81 in FY2025; up 62 since FY2021.
94	Quacito LLC Top agencies Army (Department of the Army)	$7,023,114	0.1%	Rank history: not on the FY2021 list and not on the FY2023–FY2025 lists; up 20 since FY2021.
95	Aegis Sciences Corporation Top agencies HHS (Department of Health and Human Services)	$7,000,000	0.1%	Rank history: #22 in FY2021 and not on the FY2023–FY2025 lists; down 73 since FY2021.
96	Destiny Management Services, LLC Top agencies DHA (Defense Health Agency) USAF (Department of the Air Force)	$6,865,988	0.1%	Rank history: #93 in FY2021, #46 in FY2023, #41 in FY2024 and #58 in FY2025; down 3 since FY2021.
97	Clinovators LLC Top agencies VA (Department of Veterans Affairs)	$6,780,021	0.1%	Rank history: not on the FY2021 list and not on the FY2023–FY2025 lists; up 260 since FY2021.
98	Fulgent Genetics, Inc. Through Fulgent Therapeutics LLC Top agencies HHS (Department of Health and Human Services) VA (Department of Veterans Affairs)	$6,665,590	0.1%	Rank history: #24 in FY2021, not on the FY2023–FY2024 lists and #87 in FY2025; down 74 since FY2021.
99	Government Imaging Services LLC Top agencies VA (Department of Veterans Affairs) DHA (Defense Health Agency) USAF (Department of the Air Force)	$6,626,056	0.1%	Rank history: not on the FY2021 list, not on the FY2023 list, #87 in FY2024 and not on the FY2025 list; up 26 since FY2021.
100	Vetmed Group LLC Top agencies VA (Department of Veterans Affairs) HHS (Department of Health and Human Services)	$6,547,155	0.1%	Rank history: not on the FY2021 list and not on the FY2023–FY2025 lists; up 37 since FY2021.

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100 of 2,585 contractors listed here. See the rest on GovTribe.

Rankings for the codes under NAICS 621

Code	Net obligations	Largest contractor
6211 Offices of Physicians	$3,013,249,169	Leidos Holdings, Inc.
6215 Medical and Diagnostic Laboratories	$1,802,580,286	Walgreen Co.
6219 Other Ambulatory Health Care Services	$1,484,077,019	Walgreen Co.
6214 Outpatient Care Centers	$1,315,028,690	Fresenius USA Inc.
6213 Offices of Other Health Practitioners	$420,124,046	Kbr, Inc.
6212 Offices of Dentists	$57,802,937	Complete Mobile Dentistry, Inc.
6216 Home Health Care Services	$44,069,179	Home Care Equipment, 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 $10.3 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 2022 ran Oct 1, 2021 – Sep 30, 2022. 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 FY2021. "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 FY2021 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 FY2022?

1. Walgreen Co. ($1.03B), 2. Leidos Holdings, Inc. ($935M), 3. UnitedHealth Group Incorporated ($804M), 4. Maximus Inc. ($691M), 5. CVS Health Corporation ($349M), 6. Fresenius USA Inc. ($289M), 7. Davita Inc. ($283M), 8. Quest Diagnostics Incorporated ($199M), 9. STG International, Inc. ($191M), 10. Laboratory Corporation of America Holdings ($181M).

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