Top 100 Contractors in NAICS 621: Ambulatory Health Care Services, Jul 2025–Jun 2026

Name: Top 100 Contractors in NAICS 621: Ambulatory Health Care Services, Jul 2025–Jun 2026
Creator: GovTribe

Parent companies by net contract obligations Jul 1, 2025 – Jun 30, 2026 Code page on GovTribe

The top 10 won 78% of NAICS 621 contract dollars from July 2025 through June 2026

Contract obligations: $15,216,323,033 Net of deobligations, by contracts coded NAICS 621 or a code under it
Contractors: 2,096 Parent companies with an obligation
Largest contractor: Leidos Holdings, Inc. $3.72 billion, 23.3% of obligations
Data as of: Oct 16, 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) Army (Department of the Army)	$3,715,015,143	23.3%	Rank history: #3 in FY2021, #2 in FY2022, #1 in FY2023, #1 in FY2024 and #1 in FY2025; up 1 since Jul 2024–Jun 2025.
2	UnitedHealth Group Incorporated 3 awardees, including Optumserve Health Services, Inc., Optum Infusion Services 308, LLC and Healthcare Connections, Inc. Top agencies VA (Department of Veterans Affairs) Army (Department of the Army) DHA (Defense Health Agency)	$2,991,733,906	18.7%	Rank history: #4 in FY2021, #3 in FY2022, #2 in FY2023, #2 in FY2024 and #2 in FY2025; down 1 since Jul 2024–Jun 2025.
3	Maximus Federal Services, Inc. Through Veterans Evaluation Services, Inc. Top agencies VA (Department of Veterans Affairs)	$2,634,071,417	16.5%	Rank history: not on the FY2021–FY2024 lists and #3 in FY2025; new, not ranked in Jul 2024–Jun 2025.
4	Loyal Source Government Services LLC Top agencies VA (Department of Veterans Affairs) DHA (Defense Health Agency)	$2,053,029,874	12.9%	Rank history: #53 in FY2021, #24 in FY2022, #12 in FY2023, #5 in FY2024 and #4 in FY2025; up 1 since Jul 2024–Jun 2025.
5	Fresenius Medical Care Holdings Inc. 8 awardees, including Dialysis Clinic, Inc., RSA - Guam LLC and RCG Mercy DES Moines, LLC Top agencies VA (Department of Veterans Affairs) DHA (Defense Health Agency)	$405,972,453	2.5%	Rank history: not on the FY2021–FY2024 lists and #5 in FY2025; down 1 since Jul 2024–Jun 2025.
6	Davita Inc. 10 awardees, including Renal Treatment Centers - West, Inc., Total Renal Care Inc. and Renal Treatment Centers-California, Inc. Top agencies VA (Department of Veterans Affairs) DHA (Defense Health Agency)	$268,782,795	1.7%	Rank history: #9 in FY2021, #7 in FY2022, #5 in FY2023, not on the FY2024 list and #6 in FY2025; unchanged since Jul 2024–Jun 2025.
7	Valor Healthcare Inc. Top agencies VA (Department of Veterans Affairs)	$133,881,044	0.8%	Rank history: #33 in FY2021, #13 in FY2022, #22 in FY2023, #44 in FY2024 and #7 in FY2025; up 3 since Jul 2024–Jun 2025.
8	Laboratory Corporation of America Holdings 6 awardees, including Laboratory Corporation of America and Center for Disease Detection, LLC Top agencies VA (Department of Veterans Affairs) DHA (Defense Health Agency) Navy (Department of the Navy)	$76,097,016	0.5%	Rank history: #46 in FY2021, #31 in FY2022, #8 in FY2023, #9 in FY2024 and #8 in FY2025; up 1 since Jul 2024–Jun 2025.
9	STG International, Inc. Top agencies VA (Department of Veterans Affairs) HHS (Department of Health and Human Services) DOI (Department of the Interior)	$67,723,979	0.4%	Rank history: #14 in FY2021, #9 in FY2022, #6 in FY2023, #6 in FY2024 and #11 in FY2025; up 2 since Jul 2024–Jun 2025.
10	Decypher Health Services, LLC Top agencies DHA (Defense Health Agency)	$66,329,631	0.4%	Rank history: not on the FY2021–FY2023 lists, #43 in FY2024 and #45 in FY2025; up 33 since Jul 2024–Jun 2025.
11	Kbr, Inc. Through KBR Wyle Services, LLC Top agencies USAF (Department of the Air Force) DHA (Defense Health Agency)	$60,435,827	0.4%	Rank history: #16 in FY2021, #16 in FY2022, #11 in FY2023, #28 in FY2024 and not on the FY2025 list; new, not ranked in Jul 2024–Jun 2025.
12	Quest Diagnostics Incorporated 4 awardees, including Diagnostic Laboratory of Oklahoma LLC, Ameripath Inc. and Quest Diagnostics of Puerto Rico Inc. Top agencies VA (Department of Veterans Affairs) DOJ (Department of Justice) DHA (Defense Health Agency)	$58,497,667	0.4%	Rank history: #13 in FY2021, #8 in FY2022, #7 in FY2023, #10 in FY2024 and #12 in FY2025; unchanged since Jul 2024–Jun 2025.
13	Spectrum Healthcare Resources, Inc. Top agencies DHA (Defense Health Agency)	$54,333,414	0.3%	Rank history: not on the FY2021–FY2023 lists, #12 in FY2024 and #18 in FY2025; unchanged since Jul 2024–Jun 2025.
14	Acuity-Chs, LLC Top agencies DHS (Department of Homeland Security) DHRA (Defense Human Resources Activity) Treasury (Department of the Treasury)	$53,542,787	0.3%	Rank history: not on the FY2021–FY2023 lists, #17 in FY2024 and #17 in FY2025; up 11 since Jul 2024–Jun 2025.
15	Cognito Systems LLC Top agencies Army (Department of the Army) Navy (Department of the Navy)	$52,606,142	0.3%	Rank history: #72 in FY2021, #58 in FY2022, #48 in FY2023, #37 in FY2024 and #35 in FY2025; up 13 since Jul 2024–Jun 2025.
16	KBR Wyle Services LLC Top agencies USAF (Department of the Air Force) USSOCOM (United States Special Operations Command) Navy (Department of the Navy)	$47,544,545	0.3%	Rank history: not on the FY2021–FY2023 lists, #11 in FY2024 and #9 in FY2025; down 8 since Jul 2024–Jun 2025.
17	The Arora Group, Inc. Top agencies DHS (Department of Homeland Security)	$46,181,135	0.3%	Rank history: not on the FY2021–FY2024 lists and #21 in FY2025; up 12 since Jul 2024–Jun 2025.
18	Dawson Cms, LLC Top agencies DHA (Defense Health Agency) Army (Department of the Army)	$45,711,840	0.3%	Rank history: not on the FY2021 list, #68 in FY2022, #49 in FY2023, #29 in FY2024 and #19 in FY2025; up 58 since Jul 2024–Jun 2025.
19	American Renal Associates LLC Top agencies VA (Department of Veterans Affairs)	$42,913,873	0.3%	Rank history: #39 in FY2021, not on the FY2022–FY2024 lists and #13 in FY2025; down 2 since Jul 2024–Jun 2025.
20	Vetmed Group LLC Top agencies VA (Department of Veterans Affairs) HHS (Department of Health and Human Services)	$40,905,512	0.3%	Rank history: not on the FY2021–FY2023 lists, #34 in FY2024 and #28 in FY2025; up 3 since Jul 2024–Jun 2025.
21	Icahn School of Medicine At Mount Sinai Top agencies HHS (Department of Health and Human Services)	$37,903,182	0.2%	Rank history: not on the FY2021–FY2024 lists and #15 in FY2025; up 3 since Jul 2024–Jun 2025.
22	Amergis Healthcare Staffing Inc. Top agencies DHS (Department of Homeland Security)	$36,984,960	0.2%	Rank history: not on the FY2021–FY2024 lists and #23 in FY2025; new, not ranked in Jul 2024–Jun 2025.
23	Sterling Medical Associates, Inc. Top agencies VA (Department of Veterans Affairs) DHA (Defense Health Agency) USAF (Department of the Air Force)	$35,633,197	0.2%	Rank history: not on the FY2021 list, #65 in FY2022, not on the FY2023–FY2024 lists and #24 in FY2025; down 3 since Jul 2024–Jun 2025.
24	Primary Care Solutions Inc. Top agencies VA (Department of Veterans Affairs)	$35,386,204	0.2%	Rank history: #41 in FY2021, #29 in FY2022, #25 in FY2023, #26 in FY2024 and #25 in FY2025; down 2 since Jul 2024–Jun 2025.
25	US Renal Care Inc. Top agencies VA (Department of Veterans Affairs)	$34,787,404	0.2%	Rank history: #37 in FY2021, #35 in FY2022, #30 in FY2023, not on the FY2024 list and #14 in FY2025; down 9 since Jul 2024–Jun 2025.
26	Luke & Associates Inc. Top agencies DHA (Defense Health Agency)	$32,344,130	0.2%	Rank history: not on the FY2021–FY2023 lists, #40 in FY2024 and #29 in FY2025; up 13 since Jul 2024–Jun 2025.
27	Roche Holdings Inc. 2 awardees, including Foundation Medicine, Inc. and Roche Diagnostics Corporation Top agencies VA (Department of Veterans Affairs)	$29,744,660	0.2%	Rank history: not on the FY2021–FY2024 lists and #16 in FY2025; up 17 since Jul 2024–Jun 2025.
28	SNA International LLC Top agencies WHS (DOD Washington Headquarters Service)	$27,493,817	0.2%	Rank history: not on the FY2021 list, #55 in FY2022, #43 in FY2023, #36 in FY2024 and #41 in FY2025; up 32 since Jul 2024–Jun 2025.
29	Giacare & Medtrust JV LLC Top agencies DHA (Defense Health Agency)	$27,043,987	0.2%	Rank history: #43 in FY2021, #20 in FY2022, #31 in FY2023, #22 in FY2024 and #27 in FY2025; up 3 since Jul 2024–Jun 2025.
30	Servefed Inc. Top agencies HHS (Department of Health and Human Services) NASA (National Aeronautics and Space Administration)	$26,391,915	0.2%	Rank history: #89 in FY2021, #34 in FY2022, #32 in FY2023, #23 in FY2024 and #26 in FY2025; down 12 since Jul 2024–Jun 2025.
31	Excelsior Ambulance Service Inc. Top agencies VA (Department of Veterans Affairs)	$26,259,763	0.2%	Rank history: #99 in FY2021, #50 in FY2022, #37 in FY2023, #35 in FY2024 and #33 in FY2025; unchanged since Jul 2024–Jun 2025.
32	Aims-Usgp JV LLC Top agencies DHA (Defense Health Agency)	$25,676,680	0.2%	Rank history: not on the FY2021–FY2024 lists and #72 in FY2025; up 29 since Jul 2024–Jun 2025.
33	Tribal Health, LLC Top agencies HHS (Department of Health and Human Services)	$25,364,326	0.2%	Rank history: not on the FY2021–FY2023 lists, #24 in FY2024 and #46 in FY2025; up 5 since Jul 2024–Jun 2025.
34	LMR Technical Group LLC Top agencies USAF (Department of the Air Force)	$25,163,163	0.2%	Rank history: #91 in FY2021, #70 in FY2022, #81 in FY2023, #77 in FY2024 and #36 in FY2025; up 16 since Jul 2024–Jun 2025.
35	Prairie Band Health Services Inc. Top agencies HHS (Department of Health and Human Services)	$24,968,377	0.2%	Rank history: not on the FY2021 list, #87 in FY2022, #87 in FY2023, #42 in FY2024 and #38 in FY2025; up 50 since Jul 2024–Jun 2025.
36	Reliance Medical Transport, LLC Top agencies VA (Department of Veterans Affairs) DHA (Defense Health Agency)	$20,945,329	0.1%	Rank history: not on the FY2021 list, #83 in FY2022, #41 in FY2023, #52 in FY2024 and #44 in FY2025; up 37 since Jul 2024–Jun 2025.
37	Acuity International LLC Top agencies Army (Department of the Army) DHS (Department of Homeland Security) Treasury (Department of the Treasury)	$20,070,283	0.1%	Rank history: not on the FY2021–FY2024 lists and #42 in FY2025; up 59 since Jul 2024–Jun 2025.
38	Prime Physicians PLLC Top agencies HHS (Department of Health and Human Services) DHA (Defense Health Agency) SSA (Social Security Administration)	$19,951,804	0.1%	Rank history: not on the FY2021–FY2023 lists, #39 in FY2024 and not on the FY2025 list; up 48 since Jul 2024–Jun 2025.
39	Matrix Providers Inc. Top agencies DHA (Defense Health Agency)	$19,886,628	0.1%	Rank history: not on the FY2021–FY2025 lists; up 193 since Jul 2024–Jun 2025.
40	Pact, Inc. Top agencies USAID (US Agency for International Development)	$19,617,368	0.1%	Rank history: not on the FY2021–FY2022 lists, #18 in FY2023, #18 in FY2024 and #84 in FY2025; down 6 since Jul 2024–Jun 2025.
41	Valor Network, Inc. Top agencies DHA (Defense Health Agency) DHS (Department of Homeland Security) VA (Department of Veterans Affairs)	$19,601,320	0.1%	Rank history: #74 in FY2021, #52 in FY2022, #47 in FY2023, #38 in FY2024 and #37 in FY2025; down 14 since Jul 2024–Jun 2025.
42	The American National Red Cross Top agencies VA (Department of Veterans Affairs) DHA (Defense Health Agency) HHS (Department of Health and Human Services)	$19,353,179	0.1%	Rank history: #35 in FY2021, #32 in FY2022, #29 in FY2023, #27 in FY2024 and #39 in FY2025; down 7 since Jul 2024–Jun 2025.
43	North American United Healthcare Services JV LLC Top agencies DHA (Defense Health Agency) VA (Department of Veterans Affairs) USAF (Department of the Air Force)	$19,275,642	0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
44	Ingenesis Inc. Top agencies DHS (Department of Homeland Security) USDA (Department of Agriculture)	$18,248,286	0.1%	Rank history: not on the FY2021–FY2024 lists and #34 in FY2025; down 7 since Jul 2024–Jun 2025.
45	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, #21 in FY2024 and #40 in FY2025; new, not ranked in Jul 2024–Jun 2025.
46	Chenega Tri-Services, LLC Top agencies Army (Department of the Army) DHA (Defense Health Agency)	$17,936,892	0.1%	Rank history: not on the FY2021–FY2023 lists, #31 in FY2024 and #20 in FY2025; down 32 since Jul 2024–Jun 2025.
47	Aspire-Luke JV LLC Top agencies DHA (Defense Health Agency)	$17,889,500	0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
48	Warrior Service Company LLC Top agencies VA (Department of Veterans Affairs)	$17,833,742	0.1%	Rank history: not on the FY2021–FY2024 lists and #31 in FY2025; down 18 since Jul 2024–Jun 2025.
49	Bay Area Anesthesia LLC Top agencies HHS (Department of Health and Human Services)	$17,796,882	0.1%	Rank history: not on the FY2021–FY2022 lists, #82 in FY2023, #48 in FY2024 and #86 in FY2025; up 38 since Jul 2024–Jun 2025.
50	Potomac Valor Healthcare 2, LLC Top agencies VA (Department of Veterans Affairs)	$17,048,745	0.1%	Rank history: not on the FY2021 list, #64 in FY2022, not on the FY2023 list, #33 in FY2024 and #50 in FY2025; up 21 since Jul 2024–Jun 2025.
51	Acmesolv, LLC Top agencies DHA (Defense Health Agency) USAF (Department of the Air Force)	$16,517,265	0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
52	Accenture Federal Services LLC Through Cognosante MVH LLC Top agencies VA (Department of Veterans Affairs)	$16,515,595	0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
53	Magnolia Government Solutions LLC Top agencies DHA (Defense Health Agency)	$16,464,648	0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
54	Aleknagik Technology, LLC Top agencies DHA (Defense Health Agency)	$16,383,879	0.1%	Rank history: not on the FY2021–FY2024 lists and #43 in FY2025; up 25 since Jul 2024–Jun 2025.
55	Destiny Management Services, LLC Top agencies DHA (Defense Health Agency)	$14,957,932	0.1%	Rank history: #93 in FY2021, #96 in FY2022, #46 in FY2023, #41 in FY2024 and #58 in FY2025; up 2 since Jul 2024–Jun 2025.
56	Cherokee Nation 2 awardees, including Cherokee Nation Integrated Health, L.L.C. and Cherokee Nation Operational Solutions, L.L.C. Top agencies Army (Department of the Army) HHS (Department of Health and Human Services)	$14,723,296	0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
57	Medtronic Inc. Through Medtronic Care Management Services, LLC Top agencies VA (Department of Veterans Affairs)	$14,703,257	0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
58	Journey Via Gurney, LLC Top agencies VA (Department of Veterans Affairs)	$14,548,341	0.1%	Rank history: not on the FY2021–FY2023 lists, #89 in FY2024 and #95 in FY2025; up 47 since Jul 2024–Jun 2025.
59	City of New York Fire Department Top agencies HHS (Department of Health and Human Services)	$14,432,858	0.1%	Rank history: not on the FY2021–FY2023 lists, #47 in FY2024 and #30 in FY2025; up 3 since Jul 2024–Jun 2025.
60	Wander Staffing LLC Top agencies DHA (Defense Health Agency) VA (Department of Veterans Affairs) HHS (Department of Health and Human Services)	$14,254,485	0.1%	Rank history: not on the FY2021–FY2023 lists, #60 in FY2024 and #57 in FY2025; down 5 since Jul 2024–Jun 2025.
61	Center for Disease Detection, LLC 4 awardees, including Laboratory Corporation of America and Medtox Laboratories Inc. Top agencies DHA (Defense Health Agency) VA (Department of Veterans Affairs) Navy (Department of the Navy)	$14,041,276	0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
62	Oneerp Solutions LLC Top agencies DHA (Defense Health Agency)	$13,225,931	0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
63	Transox Inc. Top agencies VA (Department of Veterans Affairs)	$12,494,953	0.1%	Rank history: not on the FY2021–FY2023 lists, #53 in FY2024 and #51 in FY2025; down 15 since Jul 2024–Jun 2025.
64	Cognito LLC Top agencies DHA (Defense Health Agency) USAF (Department of the Air Force)	$12,379,597	0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
65	Health Partner's Management Group, Incorporated Top agencies DHA (Defense Health Agency) USAF (Department of the Air Force)	$11,966,173	0.1%	Rank history: not on the FY2021 list, #88 in FY2022, #56 in FY2023, #51 in FY2024 and #49 in FY2025; down 20 since Jul 2024–Jun 2025.
66	WJM Professional Services LLC Top agencies DHS (Department of Homeland Security) DHA (Defense Health Agency) VA (Department of Veterans Affairs)	$11,912,626	0.1%	Rank history: not on the FY2021–FY2024 lists and #32 in FY2025; down 40 since Jul 2024–Jun 2025.
67	CG Services LLC Top agencies DHA (Defense Health Agency)	$11,731,834	0.1%	Rank history: not on the FY2021–FY2023 lists, #57 in FY2024 and #52 in FY2025; down 8 since Jul 2024–Jun 2025.
68	Nativearc II, LLC Top agencies HHS (Department of Health and Human Services)	$11,255,352	0.1%	Rank history: not on the FY2021–FY2025 lists; up 112 since Jul 2024–Jun 2025.
69	PDQ Health Services, LLC Top agencies DHA (Defense Health Agency)	$11,192,523	0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
70	Crassociates, Inc. Top agencies VA (Department of Veterans Affairs)	$11,025,790	0.1%	Rank history: #20 in FY2021, #54 in FY2022, not on the FY2023–FY2024 lists and #47 in FY2025; down 29 since Jul 2024–Jun 2025.
71	Baylor Miraca Genetics Laboratories LLC Top agencies VA (Department of Veterans Affairs) HHS (Department of Health and Human Services) DHA (Defense Health Agency)	$11,007,697	0.1%	Rank history: not on the FY2021–FY2024 lists and #59 in FY2025; up 290 since Jul 2024–Jun 2025.
72	The Henry M. Jackson Foundation for the Advancement of Military Medicine, Inc. Top agencies DHA (Defense Health Agency)	$10,902,767	0.1%	Rank history: not on the FY2021 list, #77 in FY2022, #59 in FY2023, not on the FY2024 list and #55 in FY2025; down 14 since Jul 2024–Jun 2025.
73	New York City Health and Hospitals Corporation Top agencies HHS (Department of Health and Human Services)	$10,416,548	0.1%	Rank history: #50 in FY2021, #56 in FY2022, #28 in FY2023, #19 in FY2024 and #22 in FY2025; down 40 since Jul 2024–Jun 2025.
74	Arup Laboratories Inc. Top agencies VA (Department of Veterans Affairs) HHS (Department of Health and Human Services) Army (Department of the Army)	$10,242,180	0.1%	Rank history: not on the FY2021–FY2024 lists and #89 in FY2025; up 19 since Jul 2024–Jun 2025.
75	Vitalant Top agencies HHS (Department of Health and Human Services) VA (Department of Veterans Affairs) DHA (Defense Health Agency)	$10,029,909	0.1%	Rank history: not on the FY2021–FY2023 lists, #98 in FY2024 and #70 in FY2025; up 36 since Jul 2024–Jun 2025.
76	Medshore Ambulance Service, Inc. Top agencies VA (Department of Veterans Affairs)	$9,814,162	0.1%	Rank history: not on the FY2021–FY2023 lists, #91 in FY2024 and #60 in FY2025; up 13 since Jul 2024–Jun 2025.
77	Global Shield Health Consultants, LLC Top agencies DHA (Defense Health Agency) Army (Department of the Army)	$9,740,032	0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
78	College of American Pathologists Top agencies VA (Department of Veterans Affairs) HHS (Department of Health and Human Services)	$9,718,878	0.1%	Rank history: not on the FY2021–FY2024 lists and #73 in FY2025; down 4 since Jul 2024–Jun 2025.
79	Medex Medical Transport Service Inc. Top agencies VA (Department of Veterans Affairs) DHA (Defense Health Agency)	$9,674,389	0.1%	Rank history: not on the FY2021–FY2022 lists, #77 in FY2023, not on the FY2024 list and #62 in FY2025; up 38 since Jul 2024–Jun 2025.
80	Gift of Hope Organ & Tissue Donor Network Top agencies VA (Department of Veterans Affairs)	$9,671,705	0.1%	Rank history: not on the FY2021–FY2022 lists, #83 in FY2023 and not on the FY2024–FY2025 lists; up 142 since Jul 2024–Jun 2025.
81	Compass Arora JV LLC Top agencies DHA (Defense Health Agency) USAF (Department of the Air Force)	$9,595,444	0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
82	Arapaho Technical Services LLC Top agencies DHA (Defense Health Agency) USAF (Department of the Air Force)	$9,570,827	0.1%	Rank history: not on the FY2021–FY2023 lists, #75 in FY2024 and #67 in FY2025; down 17 since Jul 2024–Jun 2025.
83	Koniag, Inc. Through Kadiak LLC Top agencies DHS (Department of Homeland Security)	$9,536,832	0.1%	Rank history: not on the FY2021 list, #67 in FY2022, #78 in FY2023, not on the FY2024 list and #77 in FY2025; up 26 since Jul 2024–Jun 2025.
84	New York University Top agencies HHS (Department of Health and Human Services) VA (Department of Veterans Affairs)	$9,201,565	0.1%	Rank history: not on the FY2021–FY2024 lists and #93 in FY2025; up 32 since Jul 2024–Jun 2025.
85	Forensic Drug & Alcohol Testing LLC Top agencies DOT (Department of Transportation) NRC (Nuclear Regulatory Commission) DOJ (Department of Justice)	$9,159,275	0.1%	Rank history: not on the FY2021–FY2023 lists, #79 in FY2024 and #80 in FY2025; down 5 since Jul 2024–Jun 2025.
86	Dilligas Corp Top agencies DHA (Defense Health Agency)	$8,912,681	0.1%	Rank history: not on the FY2021–FY2022 lists, #44 in FY2023, #80 in FY2024 and #48 in FY2025; down 34 since Jul 2024–Jun 2025.
87	Nationwide Healthcare Solutions, LLC Top agencies HHS (Department of Health and Human Services) DHA (Defense Health Agency)	$8,777,856	0.1%	Rank history: not on the FY2021–FY2024 lists and #56 in FY2025; down 45 since Jul 2024–Jun 2025.
88	Oregon Health & Science University Top agencies VA (Department of Veterans Affairs)	$8,769,360	0.1%	Rank history: #76 in FY2021, not on the FY2022 list, #54 in FY2023, #76 in FY2024 and not on the FY2025 list; down 24 since Jul 2024–Jun 2025.
89	Alert Ambulance Service, Inc. Top agencies VA (Department of Veterans Affairs)	$8,703,212	0.1%	Rank history: not on the FY2021–FY2024 lists and #85 in FY2025; up 1 since Jul 2024–Jun 2025.
90	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, #65 in FY2024 and #75 in FY2025; new, not ranked in Jul 2024–Jun 2025.
91	Boosted Commerce Inc. Through Wellpath LLC Top agencies DOJ (Department of Justice)	$8,505,100	0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
92	Maat Enterprises Inc. Top agencies HHS (Department of Health and Human Services)	$8,465,467	0.1%	Rank history: not on the FY2021–FY2022 lists, #73 in FY2023, #73 in FY2024 and not on the FY2025 list; new, not ranked in Jul 2024–Jun 2025.
93	Four Winds Staffing LLC Top agencies HHS (Department of Health and Human Services)	$7,888,733	<0.1%	Rank history: not on the FY2021–FY2022 lists, #64 in FY2023, #55 in FY2024 and #66 in FY2025; down 46 since Jul 2024–Jun 2025.
94	Dialysis Newco, LLC Top agencies VA (Department of Veterans Affairs)	$7,885,383	<0.1%	Rank history: not on the FY2021–FY2024 lists and #63 in FY2025; down 22 since Jul 2024–Jun 2025.
95	Tryfacta Inc. Top agencies DHA (Defense Health Agency)	$7,830,565	<0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
96	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)	$7,825,348	<0.1%	Rank history: not on the FY2021–FY2024 lists and #91 in FY2025; up 6 since Jul 2024–Jun 2025.
97	Akicita Cyber LLC Top agencies HHS (Department of Health and Human Services)	$7,658,117	<0.1%	Rank history: not on the FY2021–FY2023 lists, #84 in FY2024 and #68 in FY2025; up 4 since Jul 2024–Jun 2025.
98	Medicus Healthcare Solutions, LLC Top agencies HHS (Department of Health and Human Services) VA (Department of Veterans Affairs)	$7,534,742	<0.1%	Rank history: not on the FY2021–FY2022 lists, #63 in FY2023, #86 in FY2024 and #88 in FY2025; unchanged since Jul 2024–Jun 2025.
99	Sonora Quest Laboratories LLC Top agencies HHS (Department of Health and Human Services) VA (Department of Veterans Affairs)	$7,355,161	<0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
100	APC Ingenesis Healthcare Staffing, LLC Top agencies DHA (Defense Health Agency) USAF (Department of the Air Force)	$7,289,765	<0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.

Show 75 more

100 of 2,096 contractors listed here. See the rest on GovTribe.

Rankings for the codes under NAICS 621

Code	Net obligations	Largest contractor
6211 Offices of Physicians	$12,111,314,550	Leidos Holdings, Inc.
6214 Outpatient Care Centers	$1,353,313,081	Fresenius Medical Care Holdings Inc.
6219 Other Ambulatory Health Care Services	$942,432,180	Acuity-Chs, LLC
6215 Medical and Diagnostic Laboratories	$417,914,450	Laboratory Corporation of America Holdings
6213 Offices of Other Health Practitioners	$322,083,671	Kbr, Inc.
6216 Home Health Care Services	$44,725,466	Warrior Service Company LLC
6212 Offices of Dentists	$24,539,633	Sterling Medical Associates, 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 $16 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.
Period: the trailing 12 months end with the last month that ended at least 90 days ago, because the Department of Defense reports its contract actions to FPDS about 90 days late. The list is rebuilt each night.
Rank changes compare with Jul 2024–Jun 2025. "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.
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 Jul 2025–Jun 2026?

1. Leidos Holdings, Inc. ($3.72B), 2. UnitedHealth Group Incorporated ($2.99B), 3. Maximus Federal Services, Inc. ($2.63B), 4. Loyal Source Government Services LLC ($2.05B), 5. Fresenius Medical Care Holdings Inc. ($406M), 6. Davita Inc. ($269M), 7. Valor Healthcare Inc. ($134M), 8. Laboratory Corporation of America Holdings ($76.1M), 9. STG International, Inc. ($67.7M), 10. Decypher Health Services, LLC ($66.3M).

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