Top 100 Contractors in NAICS 621: Ambulatory Health Care Services, FY2024

Name: Top 100 Contractors in NAICS 621: Ambulatory Health Care Services, FY2024
Creator: GovTribe

Parent companies by net contract obligations Oct 1, 2023 – Sep 30, 2024 Code page on GovTribe

The top 10 won 63% of FY2024 NAICS 621 contract dollars

Contract obligations: $7,873,720,951 Net of deobligations, by contracts coded NAICS 621 or a code under it
Contractors: 2,597 Parent companies with an obligation
Largest contractor: Leidos Holdings, Inc. $1.94 billion, 21.7% 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) DHS (Department of Homeland Security)	$1,940,842,390	21.7%	Rank history: #3 in FY2021, #2 in FY2022, #1 in FY2023 and #1 in FY2025; unchanged since FY2023.
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)	$1,586,817,487	17.8%	Rank history: #4 in FY2021, #3 in FY2022, #2 in FY2023 and #2 in FY2025; unchanged since FY2023.
3	Veterans Evaluation Services, Inc. Top agencies VA (Department of Veterans Affairs)	$825,702,976	9.2%	Rank history: #8 in FY2021, not on the FY2022–FY2023 lists and not on the FY2025 list; returned.
4	Maximus Inc. Through Veterans Evaluation Services, Inc. Top agencies VA (Department of Veterans Affairs)	$312,263,544	3.5%	Rank history: #11 in FY2021, #4 in FY2022, #3 in FY2023 and not on the FY2025 list; down 1 since FY2023.
5	Loyal Source Government Services LLC 2 awardees Top agencies VA (Department of Veterans Affairs) USAF (Department of the Air Force) DHA (Defense Health Agency)	$260,479,724	2.9%	Rank history: #53 in FY2021, #24 in FY2022, #12 in FY2023 and #4 in FY2025; up 7 since FY2023.
6	STG International, Inc. Top agencies DHS (Department of Homeland Security) VA (Department of Veterans Affairs) HHS (Department of Health and Human Services)	$195,364,088	2.2%	Rank history: #14 in FY2021, #9 in FY2022, #6 in FY2023 and #11 in FY2025; unchanged since FY2023.
7	American Medical Response Inc. 20 awardees, including Abbott Ambulance, Inc., Life Line Ambulance Service, Inc. and Lifefleet Southeast Inc. Top agencies DHS (Department of Homeland Security) VA (Department of Veterans Affairs) DOJ (Department of Justice)	$139,490,346	1.6%	Rank history: #5 in FY2021, #11 in FY2022, not on the FY2023 list and #10 in FY2025; returned.
8	Tcfii Valor Buyer LLC Through Valor Healthcare Inc. Top agencies VA (Department of Veterans Affairs)	$126,508,925	1.4%	Rank history: #21 in FY2021, #21 in FY2022, #10 in FY2023 and not on the FY2025 list; up 2 since FY2023.
9	Laboratory Corporation of America 7 awardees, including Center for Disease Detection, LLC, Labcorp Oklahoma Inc. and Medtox Laboratories Inc. Top agencies DHA (Defense Health Agency) VA (Department of Veterans Affairs) Army (Department of the Army)	$111,229,044	1.2%	Rank history: #46 in FY2021, #31 in FY2022, #8 in FY2023 and #8 in FY2025; down 1 since FY2023.
10	Quest Diagnostics Incorporated 7 awardees, including Diagnostic Laboratory of Oklahoma LLC, Quest Diagnostics Clinical Laboratories, Inc. and Ameripath Inc. Top agencies VA (Department of Veterans Affairs) DOJ (Department of Justice) HHS (Department of Health and Human Services)	$105,006,554	1.2%	Rank history: #13 in FY2021, #8 in FY2022, #7 in FY2023 and #12 in FY2025; down 3 since FY2023.
11	KBR Wyle Services, LLC 2 awardees Top agencies USAF (Department of the Air Force) Navy (Department of the Navy) DHA (Defense Health Agency)	$97,333,968	1.1%	Rank history: not on the FY2021–FY2023 lists and #9 in FY2025; new.
12	Spectrum Healthcare Resources, Inc. Top agencies DHA (Defense Health Agency) HHS (Department of Health and Human Services) VA (Department of Veterans Affairs)	$81,873,362	0.9%	Rank history: not on the FY2021–FY2023 lists and #18 in FY2025; new.
13	Sterling Medical Corporation Through Sterling Medical Associates, Inc. Top agencies VA (Department of Veterans Affairs) DHA (Defense Health Agency) USAF (Department of the Air Force)	$39,929,846	0.4%	Rank history: #17 in FY2021, #23 in FY2022, #14 in FY2023 and not on the FY2025 list; up 1 since FY2023.
14	Icahn School of Medicine at Mount Sinai 2 awardees Top agencies HHS (Department of Health and Human Services)	$39,679,247	0.4%	Rank history: #30 in FY2021, #40 in FY2022, #20 in FY2023 and not on the FY2025 list; up 6 since FY2023.
15	Complete Mobile Dentistry Inc. Top agencies DHA (Defense Health Agency) HHS (Department of Health and Human Services)	$39,471,783	0.4%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
16	International Sos Government Medical Services, Inc. Top agencies Army (Department of the Army)	$33,143,692	0.4%	Rank history: not on the FY2021 list, #25 in FY2022, #13 in FY2023 and not on the FY2025 list; down 3 since FY2023.
17	Acuity-Chs, LLC Top agencies DHS (Department of Homeland Security) DHRA (Defense Human Resources Activity) Treasury (Department of the Treasury)	$32,964,469	0.4%	Rank history: not on the FY2021–FY2023 lists and #17 in FY2025; new.
18	Pact, Inc. Top agencies USAID (US Agency for International Development)	$32,860,000	0.4%	Rank history: not on the FY2021–FY2022 lists, #18 in FY2023 and #84 in FY2025; unchanged since FY2023.
19	New York City Health and Hospitals Corporation Top agencies HHS (Department of Health and Human Services)	$31,588,986	0.4%	Rank history: #50 in FY2021, #56 in FY2022, #28 in FY2023 and #22 in FY2025; up 9 since FY2023.
20	Community Blood Center Top agencies HHS (Department of Health and Human Services) VA (Department of Veterans Affairs) DHA (Defense Health Agency)	$30,886,791	0.3%	Rank history: not on the FY2021 list, #26 in FY2022, not on the FY2023 list and not on the FY2025 list; returned.
21	The Research Foundation for the State University of New York Top agencies HHS (Department of Health and Human Services)	$29,232,021	0.3%	Rank history: not on the FY2021–FY2023 lists and #40 in FY2025; new.
22	Giacare & Medtrust JV LLC Top agencies Army (Department of the Army)	$28,147,228	0.3%	Rank history: #43 in FY2021, #20 in FY2022, #31 in FY2023 and #27 in FY2025; up 9 since FY2023.
23	Servefed Inc. Top agencies HHS (Department of Health and Human Services) NASA (National Aeronautics and Space Administration)	$24,806,656	0.3%	Rank history: #89 in FY2021, #34 in FY2022, #32 in FY2023 and #26 in FY2025; up 9 since FY2023.
24	Tribal Health, LLC Top agencies HHS (Department of Health and Human Services)	$24,009,740	0.3%	Rank history: not on the FY2021–FY2023 lists and #46 in FY2025; up 108 since FY2023.
25	Roche Diabetes Care Inc Through Foundation Medicine, Inc. Top agencies VA (Department of Veterans Affairs)	$23,245,082	0.3%	Rank history: not on the FY2021–FY2022 lists, #34 in FY2023 and not on the FY2025 list; up 9 since FY2023.
26	Primary Care Solutions Inc. Top agencies VA (Department of Veterans Affairs)	$23,003,684	0.3%	Rank history: #41 in FY2021, #29 in FY2022, #25 in FY2023 and #25 in FY2025; down 1 since FY2023.
27	The American National Red Cross 3 awardees Top agencies VA (Department of Veterans Affairs) DHA (Defense Health Agency) DOJ (Department of Justice)	$21,943,109	0.2%	Rank history: #35 in FY2021, #32 in FY2022, #29 in FY2023 and #39 in FY2025; up 2 since FY2023.
28	Kbr, Inc. Through KBR Wyle Services, LLC Top agencies USAF (Department of the Air Force) Navy (Department of the Navy)	$21,773,500	0.2%	Rank history: #16 in FY2021, #16 in FY2022, #11 in FY2023 and not on the FY2025 list; down 17 since FY2023.
29	Dawson Cms, LLC Top agencies DHA (Defense Health Agency) Army (Department of the Army)	$21,597,962	0.2%	Rank history: not on the FY2021 list, #68 in FY2022, #49 in FY2023 and #19 in FY2025; up 20 since FY2023.
30	CVS Health Corporation Through CVS Pharmacy, Inc. Top agencies HHS (Department of Health and Human Services)	$20,000,000	0.2%	Rank history: #18 in FY2021, #5 in FY2022, #9 in FY2023 and not on the FY2025 list; down 21 since FY2023.
31	Chenega Tri-Services, LLC Top agencies Army (Department of the Army) DHA (Defense Health Agency)	$19,993,408	0.2%	Rank history: not on the FY2021–FY2023 lists and #20 in FY2025; new.
32	The Chenega Corporation 3 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)	$19,335,515	0.2%	Rank history: #26 in FY2021, #28 in FY2022, #19 in FY2023 and not on the FY2025 list; down 13 since FY2023.
33	Potomac Valor Healthcare 2, LLC Top agencies VA (Department of Veterans Affairs)	$18,807,027	0.2%	Rank history: not on the FY2021 list, #64 in FY2022, not on the FY2023 list and #50 in FY2025; up 75 since FY2023.
34	Vetmed Group LLC Top agencies HHS (Department of Health and Human Services) VA (Department of Veterans Affairs)	$18,224,669	0.2%	Rank history: not on the FY2021–FY2023 lists and #28 in FY2025; up 140 since FY2023.
35	Excelsior Ambulance Service Inc. Top agencies VA (Department of Veterans Affairs)	$18,031,529	0.2%	Rank history: #99 in FY2021, #50 in FY2022, #37 in FY2023 and #33 in FY2025; up 2 since FY2023.
36	SNA International LLC Top agencies OSD (Office of the Secretary of Defense) WHS (DOD Washington Headquarters Service)	$17,407,755	0.2%	Rank history: not on the FY2021 list, #55 in FY2022, #43 in FY2023 and #41 in FY2025; up 7 since FY2023.
37	Cognito Systems LLC Top agencies Army (Department of the Army)	$16,150,361	0.2%	Rank history: #72 in FY2021, #58 in FY2022, #48 in FY2023 and #35 in FY2025; up 11 since FY2023.
38	Valor Network, Inc. Top agencies DHA (Defense Health Agency) DHS (Department of Homeland Security) VA (Department of Veterans Affairs)	$15,771,879	0.2%	Rank history: #74 in FY2021, #52 in FY2022, #47 in FY2023 and #37 in FY2025; up 9 since FY2023.
39	Prime Physicians PLLC Top agencies HHS (Department of Health and Human Services) SSA (Social Security Administration) Treasury (Department of the Treasury)	$15,771,821	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; up 333 since FY2023.
40	Luke & Associates Inc. Top agencies DHA (Defense Health Agency)	$15,093,280	0.2%	Rank history: not on the FY2021–FY2023 lists and #29 in FY2025; new.
41	Destiny Management Services, LLC Top agencies DHA (Defense Health Agency) USAF (Department of the Air Force)	$14,939,958	0.2%	Rank history: #93 in FY2021, #96 in FY2022, #46 in FY2023 and #58 in FY2025; up 5 since FY2023.
42	Prairie Band Health Services Inc. Top agencies HHS (Department of Health and Human Services)	$14,914,650	0.2%	Rank history: not on the FY2021 list, #87 in FY2022, #87 in FY2023 and #38 in FY2025; up 45 since FY2023.
43	Decypher Health Services, LLC Top agencies DHA (Defense Health Agency)	$14,778,200	0.2%	Rank history: not on the FY2021–FY2023 lists and #45 in FY2025; new.
44	Valor Healthcare Inc. 2 awardees, including Crassociates, Inc. Top agencies VA (Department of Veterans Affairs)	$14,097,336	0.2%	Rank history: #33 in FY2021, #13 in FY2022, #22 in FY2023 and #7 in FY2025; down 22 since FY2023.
45	Team Health Inc. Through Spectrum Healthcare Resources, Inc. Top agencies DHA (Defense Health Agency) HHS (Department of Health and Human Services)	$14,050,948	0.2%	Rank history: #19 in FY2021, #17 in FY2022, #15 in FY2023 and not on the FY2025 list; down 30 since FY2023.
46	Ansible Government Solutions LLC Top agencies VA (Department of Veterans Affairs)	$14,012,558	0.2%	Rank history: not on the FY2021–FY2022 lists, #36 in FY2023 and not on the FY2025 list; down 10 since FY2023.
47	City of New York Fire Department Top agencies HHS (Department of Health and Human Services)	$13,901,039	0.2%	Rank history: not on the FY2021–FY2023 lists and #30 in FY2025; new.
48	Bay Area Anesthesia LLC Top agencies HHS (Department of Health and Human Services)	$12,094,357	0.1%	Rank history: not on the FY2021–FY2022 lists, #82 in FY2023 and #86 in FY2025; up 34 since FY2023.
49	Mid-Cities Home Medical Delivery Service, L.L.C. Top agencies VA (Department of Veterans Affairs)	$12,068,795	0.1%	Rank history: #81 in FY2021, #81 in FY2022, #60 in FY2023 and not on the FY2025 list; up 11 since FY2023.
50	Prairie Quest, Inc. Top agencies DHA (Defense Health Agency)	$11,987,611	0.1%	Rank history: #71 in FY2021, #72 in FY2022, #58 in FY2023 and #54 in FY2025; up 8 since FY2023.
51	Health Partner's Management Group, Incorporated Top agencies DHA (Defense Health Agency) USAF (Department of the Air Force)	$11,870,023	0.1%	Rank history: not on the FY2021 list, #88 in FY2022, #56 in FY2023 and #49 in FY2025; up 5 since FY2023.
52	Reliance Medical Transport, LLC Top agencies VA (Department of Veterans Affairs) DHA (Defense Health Agency)	$11,781,053	0.1%	Rank history: not on the FY2021 list, #83 in FY2022, #41 in FY2023 and #44 in FY2025; down 11 since FY2023.
53	Transox Inc. Top agencies VA (Department of Veterans Affairs)	$11,606,128	0.1%	Rank history: not on the FY2021–FY2023 lists and #51 in FY2025; new.
54	Wisestaff, LLC Top agencies Army (Department of the Army)	$11,086,730	0.1%	Rank history: #61 in FY2021, #42 in FY2022, #76 in FY2023 and #53 in FY2025; up 22 since FY2023.
55	Four Winds Staffing LLC Top agencies HHS (Department of Health and Human Services)	$10,953,401	0.1%	Rank history: not on the FY2021–FY2022 lists, #64 in FY2023 and #66 in FY2025; up 9 since FY2023.
56	Arlluk Technology Solutions LLC Top agencies USAF (Department of the Air Force)	$10,918,050	0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
57	CG Services LLC Top agencies DHA (Defense Health Agency)	$10,714,934	0.1%	Rank history: not on the FY2021–FY2023 lists and #52 in FY2025; new.
58	CS Holding Inc. Through CG Services LLC Top agencies DHA (Defense Health Agency)	$10,702,008	0.1%	Rank history: #94 in FY2021, not on the FY2022 list, #67 in FY2023 and not on the FY2025 list; up 9 since FY2023.
59	Sequoyah Staffing Agency, LLC Top agencies HHS (Department of Health and Human Services)	$10,621,956	0.1%	Rank history: not on the FY2021–FY2022 lists, #66 in FY2023 and not on the FY2025 list; up 7 since FY2023.
60	Wander Staffing LLC Top agencies DHA (Defense Health Agency) VA (Department of Veterans Affairs) HHS (Department of Health and Human Services)	$10,576,540	0.1%	Rank history: not on the FY2021–FY2023 lists and #57 in FY2025; up 212 since FY2023.
61	Tempus AI, Inc. Top agencies VA (Department of Veterans Affairs)	$10,124,643	0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; up 183 since FY2023.
62	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)	$9,842,387	0.1%	Rank history: not on the FY2021–FY2023 lists and #74 in FY2025; up 309 since FY2023.
63	Northwell Health, Inc. 2 awardees, including North Shore University Hospital Top agencies HHS (Department of Health and Human Services) DOT (Department of Transportation)	$9,695,768	0.1%	Rank history: not on the FY2021 list, #93 in FY2022, not on the FY2023 list and #81 in FY2025; up 46 since FY2023.
64	Abbott Laboratories Inc. 3 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) DOT (Department of Transportation)	$9,422,333	0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
65	The Univeristy of Texas M.d. Anderson Cancer Center Top agencies HHS (Department of Health and Human Services)	$9,040,320	0.1%	Rank history: not on the FY2021–FY2023 lists and #75 in FY2025; new.
66	United Medevac Solutions, Inc. Top agencies DHA (Defense Health Agency) VA (Department of Veterans Affairs) USAF (Department of the Air Force)	$8,824,376	0.1%	Rank history: #62 in FY2021, #61 in FY2022, #57 in FY2023 and #98 in FY2025; down 9 since FY2023.
67	Akima Global Logistics, LLC Top agencies Army (Department of the Army)	$8,809,904	0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; up 108 since FY2023.
68	Acadian Ambulance Service Inc. 2 awardees, including Acadian Ambulance Service of Tennessee, LLC Top agencies VA (Department of Veterans Affairs) DOJ (Department of Justice)	$8,794,262	0.1%	Rank history: #59 in FY2021, #59 in FY2022, #75 in FY2023 and not on the FY2025 list; up 7 since FY2023.
69	Delta Dental Plan of Oklahoma Top agencies HHS (Department of Health and Human Services)	$8,732,261	0.1%	Rank history: not on the FY2021–FY2022 lists, #52 in FY2023 and not on the FY2025 list; down 17 since FY2023.
70	T3I, Inc. Top agencies USAF (Department of the Air Force)	$8,485,596	0.1%	Rank history: #96 in FY2021, not on the FY2022 list, #80 in FY2023 and #69 in FY2025; up 10 since FY2023.
71	Rotech Healthcare Inc. Top agencies VA (Department of Veterans Affairs)	$8,430,533	0.1%	Rank history: #49 in FY2021, not on the FY2022 list, #55 in FY2023 and #100 in FY2025; down 16 since FY2023.
72	Avosys Technology, Inc. Top agencies DHA (Defense Health Agency) USAF (Department of the Air Force)	$8,400,078	0.1%	Rank history: #55 in FY2021, #62 in FY2022, #38 in FY2023 and #64 in FY2025; down 34 since FY2023.
73	Maat Enterprises Inc. Top agencies HHS (Department of Health and Human Services)	$8,046,152	0.1%	Rank history: not on the FY2021–FY2022 lists, #73 in FY2023 and not on the FY2025 list; unchanged since FY2023.
74	Vesa Health & Technology Inc. Top agencies DHS (Department of Homeland Security) DHA (Defense Health Agency)	$7,990,038	0.1%	Rank history: #36 in FY2021, #46 in FY2022, #53 in FY2023 and not on the FY2025 list; down 21 since FY2023.
75	Arapaho Technical Services LLC Top agencies DHA (Defense Health Agency) USAF (Department of the Air Force)	$7,898,142	0.1%	Rank history: not on the FY2021–FY2023 lists and #67 in FY2025; up 105 since FY2023.
76	Oregon Health & Science University Top agencies VA (Department of Veterans Affairs)	$7,845,074	0.1%	Rank history: #76 in FY2021, not on the FY2022 list, #54 in FY2023 and not on the FY2025 list; down 22 since FY2023.
77	LMR Technical Group LLC Top agencies USAF (Department of the Air Force)	$7,705,339	0.1%	Rank history: #91 in FY2021, #70 in FY2022, #81 in FY2023 and #36 in FY2025; up 4 since FY2023.
78	Kadiak LLC Top agencies DHS (Department of Homeland Security)	$7,627,360	0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
79	Forensic Drug & Alcohol Testing LLC Top agencies DOT (Department of Transportation) NRC (Nuclear Regulatory Commission) DOJ (Department of Justice)	$7,505,244	0.1%	Rank history: not on the FY2021–FY2023 lists and #80 in FY2025; up 58 since FY2023.
80	Dilligas Corp Top agencies DHA (Defense Health Agency) USAF (Department of the Air Force)	$7,466,668	0.1%	Rank history: not on the FY2021–FY2022 lists, #44 in FY2023 and #48 in FY2025; down 36 since FY2023.
81	Jan-Care Ambulance of North Central W.va., Inc. Top agencies VA (Department of Veterans Affairs)	$7,454,188	0.1%	Rank history: not on the FY2021 list, #80 in FY2022, #84 in FY2023 and #61 in FY2025; up 3 since FY2023.
82	STS Solutions and Training, LLC Top agencies Army (Department of the Army)	$7,337,443	0.1%	Rank history: #42 in FY2021, #53 in FY2022, #42 in FY2023 and not on the FY2025 list; down 40 since FY2023.
83	First Care Ohio LLC Top agencies VA (Department of Veterans Affairs)	$7,318,395	0.1%	Rank history: not on the FY2021–FY2023 lists and #82 in FY2025; up 90 since FY2023.
84	Akicita Cyber LLC Top agencies HHS (Department of Health and Human Services)	$7,212,567	0.1%	Rank history: not on the FY2021–FY2023 lists and #68 in FY2025; up 46 since FY2023.
85	Ridgecrest Regional Hospital Top agencies Navy (Department of the Navy)	$6,761,304	0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
86	Medicus Healthcare Solutions, LLC Top agencies VA (Department of Veterans Affairs) HHS (Department of Health and Human Services)	$6,710,614	0.1%	Rank history: not on the FY2021–FY2022 lists, #63 in FY2023 and #88 in FY2025; down 23 since FY2023.
87	Government Imaging Services LLC Top agencies VA (Department of Veterans Affairs)	$6,556,061	0.1%	Rank history: not on the FY2021 list, #99 in FY2022, not on the FY2023 list and not on the FY2025 list; up 17 since FY2023.
88	Paramedic Systems Inc Through Alert Ambulance Service, Inc. Top agencies VA (Department of Veterans Affairs)	$6,470,606	0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
89	Journey Via Gurney, LLC Top agencies VA (Department of Veterans Affairs)	$6,398,988	0.1%	Rank history: not on the FY2021–FY2023 lists and #95 in FY2025; up 57 since FY2023.
90	Anthony & Associates Inc. Top agencies USAF (Department of the Air Force) DHA (Defense Health Agency)	$6,299,066	0.1%	Rank history: not on the FY2021–FY2022 lists, #27 in FY2023 and not on the FY2025 list; down 63 since FY2023.
91	Medshore Ambulance Service, Inc. Top agencies VA (Department of Veterans Affairs)	$6,278,558	0.1%	Rank history: not on the FY2021–FY2023 lists and #60 in FY2025; new.
92	Front Line EMS LLC Top agencies USDA (Department of Agriculture) HHS (Department of Health and Human Services) VA (Department of Veterans Affairs)	$6,229,469	0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
93	Rutgers the State University of New Jersey Top agencies HHS (Department of Health and Human Services)	$5,948,265	0.1%	Rank history: not on the FY2021–FY2023 lists and #65 in FY2025; new.
94	Empowered Management Solutions LLC Top agencies DHA (Defense Health Agency) USAF (Department of the Air Force)	$5,929,755	0.1%	Rank history: #80 in FY2021, #71 in FY2022, #93 in FY2023 and not on the FY2025 list; down 1 since FY2023.
95	Maxmed Healthcare Inc. Top agencies Army (Department of the Army) DHA (Defense Health Agency) USAF (Department of the Air Force)	$5,867,713	0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; up 12 since FY2023.
96	Ware River Consulting LLC Top agencies HHS (Department of Health and Human Services)	$5,846,785	0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; up 96 since FY2023.
97	Seattle Indian Health Board Top agencies HHS (Department of Health and Human Services)	$5,829,148	0.1%	Rank history: not on the FY2021–FY2022 lists, #99 in FY2023 and not on the FY2025 list; up 2 since FY2023.
98	Blood Systems Inc. 2 awardees, including Vitalant and Lifestream Blood Bank Top agencies VA (Department of Veterans Affairs) HHS (Department of Health and Human Services) USAF (Department of the Air Force)	$5,820,774	0.1%	Rank history: not on the FY2021–FY2023 lists and #70 in FY2025; up 4 since FY2023.
99	Caban Resources LLC Top agencies DHA (Defense Health Agency) USAF (Department of the Air Force)	$5,726,543	0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
100	SS Medical, Inc. Top agencies VA (Department of Veterans Affairs)	$5,653,366	0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.

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100 of 2,597 contractors listed here. See the rest on GovTribe.

Rankings for the codes under NAICS 621

Code	Net obligations	Largest contractor
6211 Offices of Physicians	$5,361,678,618	Leidos Holdings, Inc.
6219 Other Ambulatory Health Care Services	$841,460,985	American Medical Response Inc.
6214 Outpatient Care Centers	$676,499,975	Tcfii Valor Buyer LLC
6215 Medical and Diagnostic Laboratories	$479,436,514	Laboratory Corporation of America
6213 Offices of Other Health Practitioners	$384,551,221	KBR Wyle Services, LLC
6216 Home Health Care Services	$65,507,174	Mid-Cities Home Medical Delivery Service, L.L.C.
6212 Offices of Dentists	$64,586,464	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 $8.93 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 2024 ran Oct 1, 2023 – Sep 30, 2024. 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 FY2023. "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 FY2023 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 FY2024?

1. Leidos Holdings, Inc. ($1.94B), 2. UnitedHealth Group Incorporated ($1.59B), 3. Veterans Evaluation Services, Inc. ($826M), 4. Maximus Inc. ($312M), 5. Loyal Source Government Services LLC ($260M), 6. STG International, Inc. ($195M), 7. American Medical Response Inc. ($139M), 8. Tcfii Valor Buyer LLC ($127M), 9. Laboratory Corporation of America ($111M), 10. Quest Diagnostics Incorporated ($105M).

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