Top 100 Contractors in NAICS 621111: Offices of Physicians (except Mental Health Specialists), FY2024

Full ranking

Rank	Contractor	Net obligations	Share	Trend
1	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)	$1,812,067,585	32.8%	Rank history: #2 in FY2021, #1 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)	$1,574,647,599	28.5%	Rank history: #3 in FY2021, #2 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	14.9%	Rank history: #4 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	5.6%	Rank history: #5 in FY2021, #3 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) DHA (Defense Health Agency)	$256,371,008	4.6%	Rank history: not on the FY2021 list, #8 in FY2022, #4 in FY2023 and #4 in FY2025; down 1 since FY2023.
6	Tribal Health, LLC Top agencies HHS (Department of Health and Human Services)	$23,209,654	0.4%	Rank history: not on the FY2021–FY2023 lists and #10 in FY2025; new.
7	Chenega Tri-Services, LLC Top agencies Army (Department of the Army)	$19,517,889	0.4%	Rank history: not on the FY2021–FY2023 lists and #5 in FY2025; new.
8	The Chenega Corporation 2 awardees, including Chenega Tri-Services, LLC Top agencies Army (Department of the Army)	$19,151,550	0.3%	Rank history: #6 in FY2021, #7 in FY2022, #6 in FY2023 and not on the FY2025 list; down 2 since FY2023.
9	Luke & Associates Inc. Top agencies DHA (Defense Health Agency)	$15,093,280	0.3%	Rank history: not on the FY2021–FY2023 lists and #6 in FY2025; new.
10	Decypher Health Services, LLC Top agencies DHA (Defense Health Agency)	$14,778,200	0.3%	Rank history: not on the FY2021–FY2023 lists and #11 in FY2025; new.
11	Prime Physicians PLLC Top agencies HHS (Department of Health and Human Services) Treasury (Department of the Treasury)	$13,264,297	0.2%	Rank history: not on the FY2021–FY2023 lists and #56 in FY2025; up 351 since FY2023.
12	Vetmed Group LLC Top agencies HHS (Department of Health and Human Services) VA (Department of Veterans Affairs)	$11,234,690	0.2%	Rank history: #30 in FY2021, #27 in FY2022, #11 in FY2023 and #12 in FY2025; down 1 since FY2023.
13	Prairie Band Health Services Inc. Top agencies HHS (Department of Health and Human Services)	$9,276,077	0.2%	Rank history: not on the FY2021 list, #21 in FY2022, #29 in FY2023 and #8 in FY2025; up 16 since FY2023.
14	Sequoyah Staffing Agency, LLC Top agencies HHS (Department of Health and Human Services)	$7,390,815	0.1%	Rank history: #21 in FY2021, #60 in FY2022, #12 in FY2023 and #18 in FY2025; down 2 since FY2023.
15	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.
16	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: #20 in FY2021, #11 in FY2022, #8 in FY2023 and #14 in FY2025; down 8 since FY2023.
17	Avosys Technology, Inc. 2 awardees Top agencies USAF (Department of the Air Force)	$6,532,154	0.1%	Rank history: #10 in FY2021, #14 in FY2022, #21 in FY2023 and #16 in FY2025; up 4 since FY2023.
18	International Sos Government Medical Services, Inc. Top agencies Army (Department of the Army)	$5,895,587	0.1%	Rank history: not on the FY2021 list, #5 in FY2022, #7 in FY2023 and not on the FY2025 list; down 11 since FY2023.
19	Sterling Medical Corporation Through Sterling Medical Associates, Inc. Top agencies USAF (Department of the Air Force) Army (Department of the Army) DHA (Defense Health Agency)	$5,539,416	0.1%	Rank history: #49 in FY2021, #56 in FY2022, not on the FY2023 list and not on the FY2025 list; returned.
20	Fedhealth Systems Alliance, LLC Top agencies VA (Department of Veterans Affairs)	$5,037,958	0.1%	Rank history: not on the FY2021–FY2023 lists and #15 in FY2025; new.
21	Acuity International LLC Top agencies Army (Department of the Army) HUD (Department of Housing and Urban Development) USDA (Department of Agriculture)	$4,711,552	0.1%	Rank history: not on the FY2021 list, #16 in FY2022, #16 in FY2023 and #9 in FY2025; down 5 since FY2023.
22	Acuity-Chs, LLC Top agencies DHRA (Defense Human Resources Activity) Treasury (Department of the Treasury) Navy (Department of the Navy)	$4,588,425	0.1%	Rank history: not on the FY2021 list, #39 in FY2022, not on the FY2023 list and #21 in FY2025; returned.
23	Team Health Inc. Through Spectrum Healthcare Resources, Inc. Top agencies HHS (Department of Health and Human Services)	$4,532,561	0.1%	Rank history: #22 in FY2021, not on the FY2022 list, #26 in FY2023 and not on the FY2025 list; up 3 since FY2023.
24	Bay Area Anesthesia LLC Top agencies HHS (Department of Health and Human Services)	$4,427,397	0.1%	Rank history: #92 in FY2021, #38 in FY2022, #13 in FY2023 and #44 in FY2025; down 11 since FY2023.
25	Spectrum Healthcare Resources, Inc. Top agencies HHS (Department of Health and Human Services) VA (Department of Veterans Affairs) DHA (Defense Health Agency)	$4,237,781	0.1%	Rank history: not on the FY2021–FY2023 lists and #48 in FY2025; up 408 since FY2023.
26	Servefed Inc. Top agencies HHS (Department of Health and Human Services)	$4,133,866	0.1%	Rank history: not on the FY2021–FY2023 lists and #25 in FY2025; new.
27	CHG Healthcare Services Inc. Through CHG Companies, Inc. Top agencies HHS (Department of Health and Human Services) DOJ (Department of Justice)	$4,020,693	0.1%	Rank history: #95 in FY2021, #35 in FY2022, #28 in FY2023 and not on the FY2025 list; up 1 since FY2023.
28	Jade Wolf Operations, LLC Top agencies VA (Department of Veterans Affairs)	$3,838,155	0.1%	Rank history: #52 in FY2021, #55 in FY2022, #10 in FY2023 and #27 in FY2025; down 18 since FY2023.
29	DAX Safety & Staffing Solutions, LLC Top agencies VA (Department of Veterans Affairs) HHS (Department of Health and Human Services)	$3,750,559	0.1%	Rank history: not on the FY2021 list, #63 in FY2022, #50 in FY2023 and #54 in FY2025; up 21 since FY2023.
30	Nativearc, LLC Top agencies HHS (Department of Health and Human Services)	$3,723,714	0.1%	Rank history: not on the FY2021 list, #23 in FY2022, #18 in FY2023 and #74 in FY2025; down 12 since FY2023.
31	EGA Associates LLC Top agencies VA (Department of Veterans Affairs)	$3,105,273	0.1%	Rank history: #34 in FY2021, #25 in FY2022, #43 in FY2023 and #24 in FY2025; up 12 since FY2023.
32	Rielcad JV LLC Top agencies Army (Department of the Army)	$2,990,059	0.1%	Rank history: #85 in FY2021, #30 in FY2022, #15 in FY2023 and #29 in FY2025; down 17 since FY2023.
33	Native Health Top agencies HHS (Department of Health and Human Services)	$2,848,584	0.1%	Rank history: #33 in FY2021, #6 in FY2022, #27 in FY2023 and #32 in FY2025; down 6 since FY2023.
34	Assurgent Medical Staffing LLC Top agencies VA (Department of Veterans Affairs)	$2,681,432	<0.1%	Rank history: #63 in FY2021, #77 in FY2022, #23 in FY2023 and #34 in FY2025; down 11 since FY2023.
35	Medical Faculty Associates, Inc. Top agencies DHA (Defense Health Agency) Peace Corps EPA (Environmental Protection Agency)	$2,619,231	<0.1%	Rank history: #25 in FY2021, #32 in FY2022, #24 in FY2023 and #69 in FY2025; down 11 since FY2023.
36	Vision Technology Inc Top agencies DHA (Defense Health Agency) Army (Department of the Army)	$2,424,238	<0.1%	Rank history: not on the FY2021–FY2023 lists and #46 in FY2025; new.
37	Chickasaw Business Solutions, LLC Top agencies USAF (Department of the Air Force)	$2,364,003	<0.1%	Rank history: not on the FY2021 list, #34 in FY2022, #25 in FY2023 and #36 in FY2025; down 12 since FY2023.
38	All Valley Imaging, L.l.c Top agencies HHS (Department of Health and Human Services)	$2,346,081	<0.1%	Rank history: not on the FY2021 list, #67 in FY2022, #31 in FY2023 and #77 in FY2025; down 7 since FY2023.
39	Massachusetts General Physicians Organization, Inc. Top agencies HHS (Department of Health and Human Services)	$2,296,794	<0.1%	Rank history: not on the FY2021–FY2023 lists and #35 in FY2025; new.
40	Nationwide Healthcare Solutions, LLC Top agencies Army (Department of the Army)	$2,018,126	<0.1%	Rank history: #35 in FY2021, #40 in FY2022, #22 in FY2023 and #39 in FY2025; down 18 since FY2023.
41	Minneapolis Radiology Associates, Ltd. Top agencies VA (Department of Veterans Affairs)	$1,980,250	<0.1%	Rank history: #41 in FY2021, #49 in FY2022, #44 in FY2023 and #47 in FY2025; up 3 since FY2023.
42	Ansible Government Solutions LLC Top agencies VA (Department of Veterans Affairs)	$1,919,944	<0.1%	Rank history: #17 in FY2021, #13 in FY2022, #14 in FY2023 and #33 in FY2025; down 28 since FY2023.
43	University System of Maryland 2 awardees, including University of Maryland Diagnostic Imaging Specialists, P. A. and University of Maryland Neurology Associates Pa Top agencies VA (Department of Veterans Affairs)	$1,887,879	<0.1%	Rank history: #19 in FY2021, #41 in FY2022, #58 in FY2023 and not on the FY2025 list; up 15 since FY2023.
44	Metropolitan Medical LLC Top agencies USDA (Department of Agriculture)	$1,841,993	<0.1%	Rank history: not on the FY2021 list, #53 in FY2022, #36 in FY2023 and not on the FY2025 list; down 8 since FY2023.
45	Wander Staffing LLC Top agencies VA (Department of Veterans Affairs) HHS (Department of Health and Human Services)	$1,825,667	<0.1%	Rank history: not on the FY2021–FY2022 lists, #77 in FY2023 and not on the FY2025 list; up 32 since FY2023.
46	U.s. Federal Solutions, Inc. Top agencies DHA (Defense Health Agency)	$1,795,820	<0.1%	Rank history: #54 in FY2021, #44 in FY2022, #32 in FY2023 and not on the FY2025 list; down 14 since FY2023.
47	University of Maryland Radiation Oncology Associates, P.a. Top agencies VA (Department of Veterans Affairs)	$1,709,535	<0.1%	Rank history: not on the FY2021–FY2023 lists and #86 in FY2025; new.
48	Akicita Cyber LLC Top agencies HHS (Department of Health and Human Services)	$1,658,073	<0.1%	Rank history: not on the FY2021–FY2022 lists, #52 in FY2023 and #61 in FY2025; up 4 since FY2023.
49	Cardiopulmonary Support Services, LLC Top agencies VA (Department of Veterans Affairs)	$1,592,923	<0.1%	Rank history: not on the FY2021 list, #92 in FY2022, #59 in FY2023 and not on the FY2025 list; up 10 since FY2023.
50	Avera Mckennan Top agencies VA (Department of Veterans Affairs)	$1,576,354	<0.1%	Rank history: not on the FY2021–FY2023 lists and #53 in FY2025; new.
51	Aldevra LLC Top agencies VA (Department of Veterans Affairs)	$1,567,119	<0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
52	Chenega Reliable Services LLC Top agencies Commerce (Department of Commerce) NSF (National Science Foundation)	$1,483,772	<0.1%	Rank history: not on the FY2021–FY2023 lists and #90 in FY2025; new.
53	Total Emergency Ambulatory Medicine LLP Top agencies VA (Department of Veterans Affairs)	$1,455,465	<0.1%	Rank history: #11 in FY2021, #18 in FY2022, #34 in FY2023 and not on the FY2025 list; down 19 since FY2023.
54	Tech62 Inc. Top agencies VA (Department of Veterans Affairs)	$1,402,357	<0.1%	Rank history: #75 in FY2021, #83 in FY2022, #53 in FY2023 and #60 in FY2025; down 1 since FY2023.
55	JR Enterprise LLC Top agencies VA (Department of Veterans Affairs)	$1,383,542	<0.1%	Rank history: not on the FY2021–FY2023 lists and #28 in FY2025; up 60 since FY2023.
56	The Johns Hopkins University Top agencies DHS (Department of Homeland Security) HHS (Department of Health and Human Services)	$1,378,026	<0.1%	Rank history: not on the FY2021–FY2022 lists, #88 in FY2023 and not on the FY2025 list; up 32 since FY2023.
57	Four Winds Staffing LLC Top agencies HHS (Department of Health and Human Services)	$1,375,038	<0.1%	Rank history: not on the FY2021 list, #99 in FY2022, #46 in FY2023 and #37 in FY2025; down 11 since FY2023.
58	Chenega Pro Federal Solutions, LLC Top agencies Commerce (Department of Commerce)	$1,350,542	<0.1%	Rank history: not on the FY2021–FY2023 lists and #64 in FY2025; new.
59	STS Government Solutions, LLC Top agencies DHA (Defense Health Agency)	$1,350,230	<0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
60	Wichita Radiological Group Pa Top agencies VA (Department of Veterans Affairs)	$1,308,166	<0.1%	Rank history: #69 in FY2021, #69 in FY2022, #60 in FY2023 and #62 in FY2025; unchanged since FY2023.
61	TDY Medical Staffing Inc. Top agencies VA (Department of Veterans Affairs)	$1,298,907	<0.1%	Rank history: #28 in FY2021, #91 in FY2022, #40 in FY2023 and #52 in FY2025; down 21 since FY2023.
62	Eagle Health Analytics, LLC Top agencies DHA (Defense Health Agency)	$1,205,809	<0.1%	Rank history: not on the FY2021–FY2022 lists, #33 in FY2023 and #57 in FY2025; down 29 since FY2023.
63	Muscogee Arora JV LLC Top agencies DHA (Defense Health Agency)	$1,178,027	<0.1%	Rank history: not on the FY2021–FY2023 lists and #98 in FY2025; new.
64	Health Carousel, LLC Through Next Medical Staffing LLC Top agencies VA (Department of Veterans Affairs)	$1,152,684	<0.1%	Rank history: #73 in FY2021, #82 in FY2022, #67 in FY2023 and not on the FY2025 list; up 3 since FY2023.
65	Vascular Radiology Associates II Top agencies VA (Department of Veterans Affairs)	$1,144,865	<0.1%	Rank history: not on the FY2021–FY2023 lists and #65 in FY2025; new.
66	Kako'o Services LLC Top agencies DOJ (Department of Justice)	$1,120,728	<0.1%	Rank history: not on the FY2021–FY2023 lists and #80 in FY2025; up 38 since FY2023.
67	CHS Middle East LLC Through Acuity-Chs, LLC Top agencies DHRA (Defense Human Resources Activity) Treasury (Department of the Treasury)	$1,107,613	<0.1%	Rank history: #23 in FY2021, #24 in FY2022, #19 in FY2023 and not on the FY2025 list; down 48 since FY2023.
68	Wellmont Cardiology Services Top agencies VA (Department of Veterans Affairs)	$1,046,284	<0.1%	Rank history: #78 in FY2021, not on the FY2022 list, #76 in FY2023 and #78 in FY2025; up 8 since FY2023.
69	Shelin, Agrawal, and Hyer, PLLC Top agencies USAF (Department of the Air Force)	$1,044,587	<0.1%	Rank history: #72 in FY2021, #73 in FY2022, #55 in FY2023 and #70 in FY2025; down 14 since FY2023.
70	Progressive Radiology LLC Top agencies VA (Department of Veterans Affairs)	$1,040,520	<0.1%	Rank history: not on the FY2021–FY2022 lists, #57 in FY2023 and #49 in FY2025; down 13 since FY2023.
71	Tribal Providers PLLC Top agencies HHS (Department of Health and Human Services)	$1,019,600	<0.1%	Rank history: not on the FY2021 list, #70 in FY2022, not on the FY2023 list and not on the FY2025 list; returned.
72	Regency Consulting Inc Top agencies HHS (Department of Health and Human Services)	$983,216	<0.1%	Rank history: not on the FY2021–FY2022 lists, #65 in FY2023 and #55 in FY2025; down 7 since FY2023.
73	Emergency Physicians Medical Group P.C. Through Vista Staffing Solutions, Inc. Top agencies HHS (Department of Health and Human Services)	$980,835	<0.1%	Rank history: not on the FY2021–FY2022 lists, #90 in FY2023 and not on the FY2025 list; up 17 since FY2023.
74	Market Services, Inc. Top agencies HHS (Department of Health and Human Services)	$958,806	<0.1%	Rank history: #39 in FY2021, #31 in FY2022, #38 in FY2023 and not on the FY2025 list; down 36 since FY2023.
75	Triwest Healthcare Alliance Corp Top agencies VA (Department of Veterans Affairs)	$943,043	<0.1%	Rank history: #1 in FY2021, #4 in FY2022, #5 in FY2023 and not on the FY2025 list; down 70 since FY2023.
76	Frontline National LLC Top agencies USAF (Department of the Air Force) USDA (Department of Agriculture)	$933,646	<0.1%	Rank history: #37 in FY2021, #50 in FY2022, not on the FY2023 list and #66 in FY2025; up 182 since FY2023.
77	Emory University Top agencies VA (Department of Veterans Affairs)	$924,174	<0.1%	Rank history: not on the FY2021 list, #76 in FY2022, #56 in FY2023 and not on the FY2025 list; down 21 since FY2023.
78	Call Solutions, LLC Top agencies VA (Department of Veterans Affairs)	$913,900	<0.1%	Rank history: #58 in FY2021, #46 in FY2022, #45 in FY2023 and #42 in FY2025; down 33 since FY2023.
79	Unmc Physicians Top agencies VA (Department of Veterans Affairs)	$840,329	<0.1%	Rank history: not on the FY2021–FY2022 lists, #85 in FY2023 and #82 in FY2025; up 6 since FY2023.
80	Certified Technical Experts, Inc. Top agencies AFRH (Armed Forces Retirement Home)	$821,293	<0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
81	El Paso-Southwestern Cardiovascular Associates, P.a. Top agencies DHA (Defense Health Agency)	$815,500	<0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; up 24 since FY2023.
82	Emerge Solutions Group LLC Top agencies VA (Department of Veterans Affairs)	$789,234	<0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
83	WJM Professional Services LLC Top agencies DHA (Defense Health Agency)	$771,962	<0.1%	Rank history: not on the FY2021 list, #87 in FY2022, #39 in FY2023 and #7 in FY2025; down 44 since FY2023.
84	Rice Solutions, LLC Top agencies VA (Department of Veterans Affairs)	$768,892	<0.1%	Rank history: not on the FY2021–FY2022 lists, #49 in FY2023 and not on the FY2025 list; down 35 since FY2023.
85	Oklahoma State University Top agencies HHS (Department of Health and Human Services)	$752,758	<0.1%	Rank history: #14 in FY2021, #19 in FY2022, #17 in FY2023 and not on the FY2025 list; down 68 since FY2023.
86	Watanabe Enterprises LLC Top agencies VA (Department of Veterans Affairs)	$748,150	<0.1%	Rank history: #100 in FY2021, #72 in FY2022, #64 in FY2023 and #71 in FY2025; down 22 since FY2023.
87	Locum Inc. Top agencies SSA (Social Security Administration)	$729,571	<0.1%	Rank history: not on the FY2021 list, #98 in FY2022, not on the FY2023 list and #91 in FY2025; up 73 since FY2023.
88	Nancy M Simpkins Top agencies SSA (Social Security Administration)	$663,797	<0.1%	Rank history: not on the FY2021–FY2022 lists, #94 in FY2023 and #72 in FY2025; up 6 since FY2023.
89	Altos Federal Group Inc. Top agencies CSOSA (Court Services and Offender Supervision Agency)	$653,715	<0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
90	Gintech LLC Top agencies DLA (Defense Logistics Agency)	$651,262	<0.1%	Rank history: not on the FY2021–FY2023 lists and #88 in FY2025; new.
91	Bexar Pediatric Surgery Associates, P.L.L.C. Top agencies Army (Department of the Army)	$647,520	<0.1%	Rank history: not on the FY2021–FY2023 lists and #73 in FY2025; new.
92	Genesiscare USA of Florida LLC Top agencies VA (Department of Veterans Affairs)	$614,620	<0.1%	Rank history: not on the FY2021–FY2023 lists and #89 in FY2025; up 145 since FY2023.
93	Laredo Technical Services, Inc. Top agencies USAF (Department of the Air Force)	$588,112	<0.1%	Rank history: not on the FY2021–FY2022 lists, #84 in FY2023 and not on the FY2025 list; down 9 since FY2023.
94	Riverside Radiology and Interventional Associates, Inc. Top agencies VA (Department of Veterans Affairs)	$579,120	<0.1%	Rank history: not on the FY2021–FY2023 lists and #100 in FY2025; up 138 since FY2023.
95	Posterity Group LLC Top agencies VA (Department of Veterans Affairs)	$577,288	<0.1%	Rank history: not on the FY2021 list, #96 in FY2022, #68 in FY2023 and not on the FY2025 list; down 27 since FY2023.
96	Children's National Medical Center Top agencies DHA (Defense Health Agency)	$574,991	<0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; up 57 since FY2023.
97	Rushmore Heart Clinic, LLC Top agencies HHS (Department of Health and Human Services)	$564,288	<0.1%	Rank history: not on the FY2021–FY2023 lists and #85 in FY2025; up 13 since FY2023.
98	Iowa Digestive Disease Center, P.C. Top agencies VA (Department of Veterans Affairs)	$562,953	<0.1%	Rank history: not on the FY2021–FY2022 lists, #80 in FY2023 and not on the FY2025 list; down 18 since FY2023.
99	Neuro Monitoring Technologies, Inc. Top agencies DHA (Defense Health Agency)	$560,350	<0.1%	Rank history: not on the FY2021–FY2023 lists and #87 in FY2025; up 35 since FY2023.
100	Locumtenens.com, LLC Top agencies VA (Department of Veterans Affairs)	$556,973	<0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.

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 $5.53 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