Top 100 Contractors in NAICS 621: Ambulatory Health Care Services, FY2025

Name: Top 100 Contractors in NAICS 621: Ambulatory Health Care Services, FY2025
Creator: GovTribe

Parent companies by net contract obligations Oct 1, 2024 – Sep 30, 2025 Code page on GovTribe

The top 10 won 74% of FY2025 NAICS 621 contract dollars

Contract obligations: $12,333,933,003 Net of deobligations, by contracts coded NAICS 621 or a code under it
Contractors: 2,329 Parent companies with an obligation
Largest contractor: Leidos Holdings, Inc. $2.78 billion, 20.8% 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	Leidos Holdings, Inc. Through QTC Medical Services Inc. Top agencies VA (Department of Veterans Affairs) DHA (Defense Health Agency) DOI (Department of the Interior)	$2,775,770,933	20.8%	Rank history: #3 in FY2021, #2 in FY2022, #1 in FY2023 and #1 in FY2024; unchanged since FY2024.
2	UnitedHealth Group Incorporated Through Optumserve Health Services, Inc. Top agencies VA (Department of Veterans Affairs) Army (Department of the Army) HHS (Department of Health and Human Services)	$2,537,091,985	19.0%	Rank history: #4 in FY2021, #3 in FY2022, #2 in FY2023 and #2 in FY2024; unchanged since FY2024.
3	Maximus Federal Services, Inc. Through Veterans Evaluation Services, Inc. Top agencies VA (Department of Veterans Affairs)	$2,033,102,251	15.2%	Rank history: not on the FY2021–FY2024 lists; new.
4	Loyal Source Government Services LLC Top agencies VA (Department of Veterans Affairs) DHA (Defense Health Agency) USAF (Department of the Air Force)	$760,621,210	5.7%	Rank history: #53 in FY2021, #24 in FY2022, #12 in FY2023 and #5 in FY2024; up 1 since FY2024.
5	NNA Inc. 8 awardees, including Fresenius Medical Care Holdings Inc., Dialysis Clinic, Inc. and RSA - Guam LLC Top agencies VA (Department of Veterans Affairs) DHA (Defense Health Agency)	$693,260,402	5.2%	Rank history: not on the FY2021–FY2024 lists; new.
6	Davita Inc. 9 awardees, including Renal Treatment Centers - West, Inc., Total Renal Care Inc. and Renal Treatment Centers-Mid-Atlantic Inc. Top agencies VA (Department of Veterans Affairs) DHA (Defense Health Agency)	$536,028,127	4.0%	Rank history: #9 in FY2021, #7 in FY2022, #5 in FY2023 and not on the FY2024 list; up 325 since FY2024.
7	Valor Healthcare Inc. Top agencies VA (Department of Veterans Affairs)	$147,990,862	1.1%	Rank history: #33 in FY2021, #13 in FY2022, #22 in FY2023 and #44 in FY2024; up 37 since FY2024.
8	Laboratory Corporation of America 7 awardees, including Center for Disease Detection, LLC and Medtox Laboratories Inc. Top agencies VA (Department of Veterans Affairs) DHA (Defense Health Agency) Army (Department of the Army)	$141,928,303	1.1%	Rank history: #46 in FY2021, #31 in FY2022, #8 in FY2023 and #9 in FY2024; up 1 since FY2024.
9	KBR Wyle Services LLC Top agencies USAF (Department of the Air Force) USSOCOM (United States Special Operations Command) Navy (Department of the Navy)	$125,413,993	0.9%	Rank history: not on the FY2021–FY2023 lists and #11 in FY2024; up 2 since FY2024.
10	American Medical Response Inc. 2 awardees, including American Medical Response West Top agencies DHS (Department of Homeland Security) DHA (Defense Health Agency) VA (Department of Veterans Affairs)	$89,642,524	0.7%	Rank history: #5 in FY2021, #11 in FY2022, not on the FY2023 list and #7 in FY2024; down 3 since FY2024.
11	STG International, Inc. Top agencies VA (Department of Veterans Affairs) HHS (Department of Health and Human Services) DOI (Department of the Interior)	$75,328,559	0.6%	Rank history: #14 in FY2021, #9 in FY2022, #6 in FY2023 and #6 in FY2024; down 5 since FY2024.
12	Quest Diagnostics Incorporated 5 awardees, including Ameripath Inc. and Quest Diagnostics of Puerto Rico Inc. Top agencies VA (Department of Veterans Affairs) DOJ (Department of Justice) DHA (Defense Health Agency)	$49,301,488	0.4%	Rank history: #13 in FY2021, #8 in FY2022, #7 in FY2023 and #10 in FY2024; down 2 since FY2024.
13	American Renal Associates LLC Top agencies VA (Department of Veterans Affairs)	$49,183,671	0.4%	Rank history: #39 in FY2021 and not on the FY2022–FY2024 lists; returned.
14	US Renal Care Inc. Top agencies VA (Department of Veterans Affairs)	$48,976,532	0.4%	Rank history: #37 in FY2021, #35 in FY2022, #30 in FY2023 and not on the FY2024 list; returned.
15	Icahn School of Medicine At Mount Sinai Top agencies HHS (Department of Health and Human Services) VA (Department of Veterans Affairs)	$48,385,232	0.4%	Rank history: not on the FY2021–FY2024 lists; new.
16	Roche Holdings Inc. 2 awardees, including Foundation Medicine, Inc. and Roche Diagnostics Corporation Top agencies VA (Department of Veterans Affairs)	$47,975,879	0.4%	Rank history: not on the FY2021–FY2024 lists; new.
17	Acuity-Chs, LLC Top agencies DHS (Department of Homeland Security) DHRA (Defense Human Resources Activity) DOI (Department of the Interior)	$43,094,284	0.3%	Rank history: not on the FY2021–FY2023 lists and #17 in FY2024; unchanged since FY2024.
18	Spectrum Healthcare Resources, Inc. Top agencies DHA (Defense Health Agency) VA (Department of Veterans Affairs)	$40,817,752	0.3%	Rank history: not on the FY2021–FY2023 lists and #12 in FY2024; down 6 since FY2024.
19	Dawson Cms, LLC Top agencies DHA (Defense Health Agency) Army (Department of the Army)	$39,268,029	0.3%	Rank history: not on the FY2021 list, #68 in FY2022, #49 in FY2023 and #29 in FY2024; up 10 since FY2024.
20	Chenega Tri-Services, LLC Top agencies Army (Department of the Army) DHA (Defense Health Agency)	$36,863,616	0.3%	Rank history: not on the FY2021–FY2023 lists and #31 in FY2024; up 11 since FY2024.
21	The Arora Group, Inc. Top agencies DHS (Department of Homeland Security)	$35,515,348	0.3%	Rank history: not on the FY2021–FY2024 lists; up 126 since FY2024.
22	New York City Health and Hospitals Corporation Top agencies HHS (Department of Health and Human Services)	$34,775,819	0.3%	Rank history: #50 in FY2021, #56 in FY2022, #28 in FY2023 and #19 in FY2024; down 3 since FY2024.
23	Amergis Healthcare Staffing Inc. 2 awardees Top agencies DHS (Department of Homeland Security)	$34,419,922	0.3%	Rank history: not on the FY2021–FY2024 lists; up 147 since FY2024.
24	Sterling Medical Associates, Inc. Top agencies VA (Department of Veterans Affairs) DHA (Defense Health Agency) Army (Department of the Army)	$34,290,748	0.3%	Rank history: not on the FY2021 list, #65 in FY2022 and not on the FY2023–FY2024 lists; returned.
25	Primary Care Solutions Inc. Top agencies VA (Department of Veterans Affairs)	$29,905,153	0.2%	Rank history: #41 in FY2021, #29 in FY2022, #25 in FY2023 and #26 in FY2024; up 1 since FY2024.
26	Servefed Inc. Top agencies HHS (Department of Health and Human Services) NASA (National Aeronautics and Space Administration)	$29,880,694	0.2%	Rank history: #89 in FY2021, #34 in FY2022, #32 in FY2023 and #23 in FY2024; down 3 since FY2024.
27	Giacare & Medtrust JV LLC Top agencies Army (Department of the Army) DHA (Defense Health Agency)	$28,986,155	0.2%	Rank history: #43 in FY2021, #20 in FY2022, #31 in FY2023 and #22 in FY2024; down 5 since FY2024.
28	Vetmed Group LLC Top agencies VA (Department of Veterans Affairs) HHS (Department of Health and Human Services)	$28,951,516	0.2%	Rank history: not on the FY2021–FY2023 lists and #34 in FY2024; up 6 since FY2024.
29	Luke & Associates Inc. Top agencies DHA (Defense Health Agency)	$27,782,959	0.2%	Rank history: not on the FY2021–FY2023 lists and #40 in FY2024; up 11 since FY2024.
30	City of New York Fire Department Top agencies HHS (Department of Health and Human Services)	$24,718,534	0.2%	Rank history: not on the FY2021–FY2023 lists and #47 in FY2024; up 17 since FY2024.
31	Warrior Service Company LLC Top agencies VA (Department of Veterans Affairs)	$24,630,911	0.2%	Rank history: not on the FY2021–FY2024 lists; up 333 since FY2024.
32	WJM Professional Services LLC Top agencies DHS (Department of Homeland Security) DHA (Defense Health Agency) VA (Department of Veterans Affairs)	$24,505,388	0.2%	Rank history: not on the FY2021–FY2024 lists; up 369 since FY2024.
33	Excelsior Ambulance Service Inc. Top agencies VA (Department of Veterans Affairs)	$23,913,089	0.2%	Rank history: #99 in FY2021, #50 in FY2022, #37 in FY2023 and #35 in FY2024; up 2 since FY2024.
34	Ingenesis Inc. Top agencies DHS (Department of Homeland Security) USDA (Department of Agriculture)	$22,828,843	0.2%	Rank history: not on the FY2021–FY2024 lists; up 138 since FY2024.
35	Cognito Systems LLC Top agencies Army (Department of the Army) Navy (Department of the Navy)	$21,261,940	0.2%	Rank history: #72 in FY2021, #58 in FY2022, #48 in FY2023 and #37 in FY2024; up 2 since FY2024.
36	LMR Technical Group LLC Top agencies USAF (Department of the Air Force)	$20,983,438	0.2%	Rank history: #91 in FY2021, #70 in FY2022, #81 in FY2023 and #77 in FY2024; up 41 since FY2024.
37	Valor Network, Inc. Top agencies DHA (Defense Health Agency) DHS (Department of Homeland Security) VA (Department of Veterans Affairs)	$20,486,836	0.2%	Rank history: #74 in FY2021, #52 in FY2022, #47 in FY2023 and #38 in FY2024; up 1 since FY2024.
38	Prairie Band Health Services Inc. Top agencies HHS (Department of Health and Human Services)	$19,154,399	0.1%	Rank history: not on the FY2021 list, #87 in FY2022, #87 in FY2023 and #42 in FY2024; up 4 since FY2024.
39	The American National Red Cross Top agencies VA (Department of Veterans Affairs) DHA (Defense Health Agency) HHS (Department of Health and Human Services)	$19,024,915	0.1%	Rank history: #35 in FY2021, #32 in FY2022, #29 in FY2023 and #27 in FY2024; down 12 since FY2024.
40	The Research Foundation for the State University of New York Top agencies HHS (Department of Health and Human Services)	$18,118,015	0.1%	Rank history: not on the FY2021–FY2023 lists and #21 in FY2024; down 19 since FY2024.
41	SNA International LLC Top agencies WHS (DOD Washington Headquarters Service)	$17,830,866	0.1%	Rank history: not on the FY2021 list, #55 in FY2022, #43 in FY2023 and #36 in FY2024; down 5 since FY2024.
42	Acuity International LLC Top agencies Army (Department of the Army) DHS (Department of Homeland Security) HUD (Department of Housing and Urban Development)	$16,711,872	0.1%	Rank history: not on the FY2021–FY2024 lists; up 77 since FY2024.
43	Aleknagik Technology, LLC Top agencies DHA (Defense Health Agency)	$16,307,850	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
44	Reliance Medical Transport, LLC Top agencies VA (Department of Veterans Affairs) DHA (Defense Health Agency)	$15,611,296	0.1%	Rank history: not on the FY2021 list, #83 in FY2022, #41 in FY2023 and #52 in FY2024; up 8 since FY2024.
45	Decypher Health Services, LLC Top agencies DHA (Defense Health Agency)	$14,908,669	0.1%	Rank history: not on the FY2021–FY2023 lists and #43 in FY2024; down 2 since FY2024.
46	Tribal Health, LLC Top agencies HHS (Department of Health and Human Services)	$14,655,969	0.1%	Rank history: not on the FY2021–FY2023 lists and #24 in FY2024; down 22 since FY2024.
47	Crassociates, Inc. Top agencies VA (Department of Veterans Affairs)	$13,765,096	0.1%	Rank history: #20 in FY2021, #54 in FY2022 and not on the FY2023–FY2024 lists; up 80 since FY2024.
48	Dilligas Corp Top agencies DHA (Defense Health Agency)	$13,607,526	0.1%	Rank history: not on the FY2021–FY2022 lists, #44 in FY2023 and #80 in FY2024; up 32 since FY2024.
49	Health Partner's Management Group, Incorporated Top agencies DHA (Defense Health Agency) USAF (Department of the Air Force)	$13,551,934	0.1%	Rank history: not on the FY2021 list, #88 in FY2022, #56 in FY2023 and #51 in FY2024; up 2 since FY2024.
50	Potomac Valor Healthcare 2, LLC Top agencies VA (Department of Veterans Affairs)	$13,120,939	0.1%	Rank history: not on the FY2021 list, #64 in FY2022, not on the FY2023 list and #33 in FY2024; down 17 since FY2024.
51	Transox Inc. Top agencies VA (Department of Veterans Affairs)	$12,953,042	0.1%	Rank history: not on the FY2021–FY2023 lists and #53 in FY2024; up 2 since FY2024.
52	CG Services LLC Top agencies DHA (Defense Health Agency)	$12,397,727	0.1%	Rank history: not on the FY2021–FY2023 lists and #57 in FY2024; up 5 since FY2024.
53	Wisestaff, LLC Top agencies DHA (Defense Health Agency) Army (Department of the Army)	$12,307,032	0.1%	Rank history: #61 in FY2021, #42 in FY2022, #76 in FY2023 and #54 in FY2024; up 1 since FY2024.
54	Prairie Quest, Inc. Top agencies DHA (Defense Health Agency)	$12,169,617	0.1%	Rank history: #71 in FY2021, #72 in FY2022, #58 in FY2023 and #50 in FY2024; down 4 since FY2024.
55	The Henry M. Jackson Foundation for the Advancement of Military Medicine, Inc. Top agencies DHA (Defense Health Agency)	$12,003,842	0.1%	Rank history: not on the FY2021 list, #77 in FY2022, #59 in FY2023 and not on the FY2024 list; up 59 since FY2024.
56	Nationwide Healthcare Solutions, LLC Top agencies HHS (Department of Health and Human Services) Army (Department of the Army)	$11,829,492	0.1%	Rank history: not on the FY2021–FY2024 lists; up 57 since FY2024.
57	Wander Staffing LLC Top agencies DHA (Defense Health Agency) VA (Department of Veterans Affairs) HHS (Department of Health and Human Services)	$11,754,534	0.1%	Rank history: not on the FY2021–FY2023 lists and #60 in FY2024; up 3 since FY2024.
58	Destiny Management Services, LLC Top agencies DHA (Defense Health Agency)	$11,751,750	0.1%	Rank history: #93 in FY2021, #96 in FY2022, #46 in FY2023 and #41 in FY2024; down 17 since FY2024.
59	Baylor Miraca Genetics Laboratories LLC Top agencies VA (Department of Veterans Affairs) HHS (Department of Health and Human Services) DHA (Defense Health Agency)	$11,645,670	0.1%	Rank history: not on the FY2021–FY2024 lists; up 312 since FY2024.
60	Medshore Ambulance Service, Inc. Top agencies VA (Department of Veterans Affairs)	$11,461,265	0.1%	Rank history: not on the FY2021–FY2023 lists and #91 in FY2024; up 31 since FY2024.
61	Jan-Care Ambulance of North Central W.va., Inc. Top agencies VA (Department of Veterans Affairs)	$11,443,449	0.1%	Rank history: not on the FY2021 list, #80 in FY2022, #84 in FY2023 and #81 in FY2024; up 20 since FY2024.
62	Medex Medical Transport Service Inc. Top agencies VA (Department of Veterans Affairs) DHA (Defense Health Agency)	$11,263,494	0.1%	Rank history: not on the FY2021–FY2022 lists, #77 in FY2023 and not on the FY2024 list; up 80 since FY2024.
63	Dialysis Newco, LLC Top agencies VA (Department of Veterans Affairs)	$11,048,990	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
64	Avosys Technology, Inc. Top agencies DHA (Defense Health Agency)	$10,933,789	0.1%	Rank history: #55 in FY2021, #62 in FY2022, #38 in FY2023 and #72 in FY2024; up 8 since FY2024.
65	Rutgers the State University of New Jersey Top agencies HHS (Department of Health and Human Services)	$10,843,885	0.1%	Rank history: not on the FY2021–FY2023 lists and #93 in FY2024; up 28 since FY2024.
66	Four Winds Staffing LLC Top agencies HHS (Department of Health and Human Services)	$10,429,388	0.1%	Rank history: not on the FY2021–FY2022 lists, #64 in FY2023 and #55 in FY2024; down 11 since FY2024.
67	Arapaho Technical Services LLC Top agencies DHA (Defense Health Agency)	$10,223,191	0.1%	Rank history: not on the FY2021–FY2023 lists and #75 in FY2024; up 8 since FY2024.
68	Akicita Cyber LLC Top agencies HHS (Department of Health and Human Services)	$9,731,194	0.1%	Rank history: not on the FY2021–FY2023 lists and #84 in FY2024; up 16 since FY2024.
69	T3I, Inc. Top agencies USAF (Department of the Air Force)	$9,583,404	0.1%	Rank history: #96 in FY2021, not on the FY2022 list, #80 in FY2023 and #70 in FY2024; up 1 since FY2024.
70	Blood Systems Inc. 2 awardees, including Vitalant Top agencies VA (Department of Veterans Affairs) HHS (Department of Health and Human Services) DHA (Defense Health Agency)	$9,464,874	0.1%	Rank history: not on the FY2021–FY2023 lists and #98 in FY2024; up 28 since FY2024.
71	Family Health International Top agencies USAID (US Agency for International Development)	$9,456,610	0.1%	Rank history: not on the FY2021–FY2024 lists; up 93 since FY2024.
72	Aims-Usgp JV LLC Top agencies DHA (Defense Health Agency)	$9,431,454	0.1%	Rank history: not on the FY2021–FY2024 lists; up 318 since FY2024.
73	College of American Pathologists Top agencies VA (Department of Veterans Affairs) HHS (Department of Health and Human Services)	$9,208,194	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
74	Dentrust Dental International, Inc. 3 awardees, including Dentrust Dental New York, P.C. and Dentrust Dental Texas, P.C. Top agencies DHS (Department of Homeland Security) Army (Department of the Army)	$9,089,156	0.1%	Rank history: not on the FY2021–FY2023 lists and #62 in FY2024; down 12 since FY2024.
75	The Univeristy of Texas M.d. Anderson Cancer Center Top agencies HHS (Department of Health and Human Services)	$8,627,520	0.1%	Rank history: not on the FY2021–FY2023 lists and #65 in FY2024; down 10 since FY2024.
76	Hawaii Life Flight LLC Top agencies VA (Department of Veterans Affairs)	$8,614,952	0.1%	Rank history: not on the FY2021–FY2024 lists; up 307 since FY2024.
77	Koniag, Inc. Through Kadiak LLC Top agencies DHS (Department of Homeland Security)	$8,451,240	0.1%	Rank history: not on the FY2021 list, #67 in FY2022, #78 in FY2023 and not on the FY2024 list; up 146 since FY2024.
78	Acadian Ambulance Service of Texas, LLC Top agencies VA (Department of Veterans Affairs) DOJ (Department of Justice)	$8,389,458	0.1%	Rank history: not on the FY2021–FY2024 lists; up 26 since FY2024.
79	Reef Systems Corp 2 awardees, including Reef Systems-Fsr LLC Top agencies USAF (Department of the Air Force) DHA (Defense Health Agency)	$8,376,520	0.1%	Rank history: not on the FY2021–FY2022 lists, #72 in FY2023 and not on the FY2024 list; up 29 since FY2024.
80	Forensic Drug & Alcohol Testing LLC Top agencies DOT (Department of Transportation) NRC (Nuclear Regulatory Commission) DOJ (Department of Justice)	$8,370,366	0.1%	Rank history: not on the FY2021–FY2023 lists and #79 in FY2024; down 1 since FY2024.
81	Northwell Health, Inc. 3 awardees, including North Shore University Hospital Top agencies DOT (Department of Transportation) HHS (Department of Health and Human Services)	$8,256,945	0.1%	Rank history: not on the FY2021 list, #93 in FY2022, not on the FY2023 list and #63 in FY2024; down 18 since FY2024.
82	First Care Ohio LLC Top agencies VA (Department of Veterans Affairs)	$8,135,262	0.1%	Rank history: not on the FY2021–FY2023 lists and #83 in FY2024; up 1 since FY2024.
83	EGA Associates LLC Top agencies VA (Department of Veterans Affairs)	$8,047,765	0.1%	Rank history: not on the FY2021–FY2024 lists; up 34 since FY2024.
84	Pact, Inc. Top agencies USAID (US Agency for International Development)	$7,500,000	0.1%	Rank history: not on the FY2021–FY2022 lists, #18 in FY2023 and #18 in FY2024; down 66 since FY2024.
85	Alert Ambulance Service, Inc. Top agencies VA (Department of Veterans Affairs)	$7,493,968	0.1%	Rank history: not on the FY2021–FY2024 lists; up 331 since FY2024.
86	Bay Area Anesthesia LLC Top agencies HHS (Department of Health and Human Services)	$7,472,738	0.1%	Rank history: not on the FY2021–FY2022 lists, #82 in FY2023 and #48 in FY2024; down 38 since FY2024.
87	Fulgent Genetics, Inc. 2 awardees, including Fulgent Therapeutics LLC Top agencies VA (Department of Veterans Affairs)	$7,414,652	0.1%	Rank history: #24 in FY2021, #98 in FY2022 and not on the FY2023–FY2024 lists; up 36 since FY2024.
88	Medicus Healthcare Solutions, LLC Top agencies HHS (Department of Health and Human Services) VA (Department of Veterans Affairs)	$7,234,455	0.1%	Rank history: not on the FY2021–FY2022 lists, #63 in FY2023 and #86 in FY2024; down 2 since FY2024.
89	Arup Laboratories Inc. Top agencies VA (Department of Veterans Affairs) HHS (Department of Health and Human Services) Army (Department of the Army)	$7,172,650	0.1%	Rank history: not on the FY2021–FY2024 lists; up 72 since FY2024.
90	North East South West Healthcare Solutions, LLC Top agencies DHS (Department of Homeland Security)	$7,039,209	0.1%	Rank history: not on the FY2021–FY2024 lists; up 81 since FY2024.
91	Mayo Collaborative Services, Inc. 2 awardees, including Mayo Clinic Arizona Top agencies HHS (Department of Health and Human Services) VA (Department of Veterans Affairs) DHA (Defense Health Agency)	$7,033,630	0.1%	Rank history: not on the FY2021–FY2024 lists; up 48 since FY2024.
92	Dalmor LLC Top agencies VA (Department of Veterans Affairs)	$6,720,652	0.1%	Rank history: not on the FY2021–FY2024 lists; up 97 since FY2024.
93	New York University Top agencies HHS (Department of Health and Human Services) VA (Department of Veterans Affairs)	$6,618,514	<0.1%	Rank history: not on the FY2021–FY2024 lists; up 17 since FY2024.
94	Wellpath LLC Top agencies DOJ (Department of Justice)	$6,565,788	<0.1%	Rank history: not on the FY2021–FY2024 lists; up 11 since FY2024.
95	Journey Via Gurney, LLC Top agencies VA (Department of Veterans Affairs)	$6,561,863	<0.1%	Rank history: not on the FY2021–FY2023 lists and #89 in FY2024; down 6 since FY2024.
96	Magellan Federal Inc. Top agencies DOI (Department of the Interior) DOT (Department of Transportation)	$6,283,755	<0.1%	Rank history: not on the FY2021–FY2024 lists; new.
97	Bloodworks Top agencies DHA (Defense Health Agency) VA (Department of Veterans Affairs) HHS (Department of Health and Human Services)	$6,241,924	<0.1%	Rank history: #98 in FY2021 and not on the FY2022–FY2024 lists; up 12 since FY2024.
98	United Medevac Solutions, Inc. Top agencies DHA (Defense Health Agency) VA (Department of Veterans Affairs)	$6,161,931	<0.1%	Rank history: #62 in FY2021, #61 in FY2022, #57 in FY2023 and #66 in FY2024; down 32 since FY2024.
99	Dt-Trak Consulting, Inc. Top agencies HHS (Department of Health and Human Services)	$5,968,053	<0.1%	Rank history: not on the FY2021–FY2024 lists; up 30 since FY2024.
100	Rotech Healthcare Inc. Top agencies VA (Department of Veterans Affairs)	$5,947,258	<0.1%	Rank history: #49 in FY2021, not on the FY2022 list, #55 in FY2023 and #71 in FY2024; down 29 since FY2024.

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100 of 2,329 contractors listed here. See the rest on GovTribe.

Rankings for the codes under NAICS 621

Code	Net obligations	Largest contractor
6211 Offices of Physicians	$8,556,740,262	Leidos Holdings, Inc.
6214 Outpatient Care Centers	$1,929,992,412	NNA Inc.
6219 Other Ambulatory Health Care Services	$844,232,533	American Medical Response Inc.
6215 Medical and Diagnostic Laboratories	$554,380,249	Laboratory Corporation of America
6213 Offices of Other Health Practitioners	$357,260,852	KBR Wyle Services LLC
6216 Home Health Care Services	$66,274,513	Warrior Service Company LLC
6212 Offices of Dentists	$25,052,182	Akicita Cyber LLC

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 $13.4 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 2025 ran Oct 1, 2024 – Sep 30, 2025. 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 FY2024. "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 FY2024 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 FY2025?

1. Leidos Holdings, Inc. ($2.78B), 2. UnitedHealth Group Incorporated ($2.54B), 3. Maximus Federal Services, Inc. ($2.03B), 4. Loyal Source Government Services LLC ($761M), 5. NNA Inc. ($693M), 6. Davita Inc. ($536M), 7. Valor Healthcare Inc. ($148M), 8. Laboratory Corporation of America ($142M), 9. KBR Wyle Services LLC ($125M), 10. American Medical Response Inc. ($89.6M).

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