Top 100 Contractors in NAICS 561: Administrative and Support Services, FY2025

Name: Top 100 Contractors in NAICS 561: Administrative and Support Services, FY2025
Creator: GovTribe

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

The top 10 won 49% of FY2025 NAICS 561 contract dollars

Contract obligations: $55,188,597,040 Net of deobligations, by contracts coded NAICS 561 or a code under it
Contractors: 8,257 Parent companies with an obligation
Largest contractor: Honeywell International Inc. $7.8 billion, 13.2% 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	Honeywell International Inc. 7 awardees, including National Technology & Engineering Solutions of Sandia, LLC and Honeywell Federal Manufacturing & Technologies, LLC Top agencies DOE (Department of Energy) Navy (Department of the Navy) USAF (Department of the Air Force)	$7,796,222,448	13.2%	Rank history: #1 in FY2021, #1 in FY2022, #1 in FY2023 and #1 in FY2024; unchanged since FY2024.
2	Triad National Security LLC Top agencies DOE (Department of Energy) Navy (Department of the Navy) USAF (Department of the Air Force)	$5,087,344,498	8.6%	Rank history: #2 in FY2021, #2 in FY2022, #2 in FY2023 and #2 in FY2024; unchanged since FY2024.
3	Ut-Battelle LLC Top agencies DOE (Department of Energy)	$2,679,775,141	4.5%	Rank history: #5 in FY2021, #5 in FY2022, #5 in FY2023 and #4 in FY2024; up 1 since FY2024.
4	Consolidated Nuclear Security, LLC Top agencies DOE (Department of Energy) Navy (Department of the Navy) Army (Department of the Army)	$2,537,032,429	4.3%	Rank history: #4 in FY2021, #4 in FY2022, #3 in FY2023 and #3 in FY2024; down 1 since FY2024.
5	Fluor Corporation 5 awardees, including Savannah River Nuclear Solutions LLC, Fluor Intercontinental, Inc. and Fluor Federal Petroleum Operations, LLC Top agencies DOE (Department of Energy) Navy (Department of the Navy) USAF (Department of the Air Force)	$2,351,264,009	4.0%	Rank history: #15 in FY2021, #15 in FY2022, #21 in FY2023 and #5 in FY2024; unchanged since FY2024.
6	V2X, Inc. 5 awardees, including V2X Systems LLC, Vertex Modernization and Sustainment LLC and Vectrus Federal Services GMBH Top agencies Army (Department of the Army) USAF (Department of the Air Force) Navy (Department of the Navy)	$2,332,235,313	3.9%	Rank history: not on the FY2021–FY2023 lists and #6 in FY2024; unchanged since FY2024.
7	Pantexas Deterrence, LLC Top agencies DOE (Department of Energy) Navy (Department of the Navy) Army (Department of the Army)	$1,921,935,329	3.2%	Rank history: not on the FY2021–FY2024 lists; up 356 since FY2024.
8	Amentum Holdings, Inc. 20 awardees, including Amentum Services, Inc., Amentum Parsons Logistics Services LLC and PAE Government Services, Inc. Top agencies Army (Department of the Army) Navy (Department of the Navy) NASA (National Aeronautics and Space Administration)	$1,814,158,061	3.1%	Rank history: not on the FY2021–FY2023 lists and #33 in FY2024; up 25 since FY2024.
9	KBR Wyle Services LLC 5 awardees, including KBR Services, LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force) Navy (Department of the Navy)	$1,206,323,915	2.0%	Rank history: not on the FY2021–FY2023 lists and #7 in FY2024; down 2 since FY2024.
10	Maximus Federal Services, Inc. Top agencies HHS (Department of Health and Human Services) DHS (Department of Homeland Security) Treasury (Department of the Treasury)	$1,107,146,305	1.9%	Rank history: not on the FY2021–FY2023 lists and #13 in FY2024; up 3 since FY2024.
11	Mission Support & Test Services LLC Top agencies DOE (Department of Energy) USAF (Department of the Air Force) Army (Department of the Army)	$994,553,799	1.7%	Rank history: #10 in FY2021, #9 in FY2022, #10 in FY2023 and #9 in FY2024; down 2 since FY2024.
12	The GEO Group, Inc. 4 awardees, including B.i. Incorporated, GEO Secure Services, LLC and GEO Transport, Inc. Top agencies DHS (Department of Homeland Security) DOJ (Department of Justice)	$852,172,357	1.4%	Rank history: #14 in FY2021, #12 in FY2022, #12 in FY2023 and #11 in FY2024; down 1 since FY2024.
13	Lockheed Martin Corporation 6 awardees Top agencies USSOCOM (United States Special Operations Command) USAF (Department of the Air Force) Army (Department of the Army)	$804,652,167	1.4%	Rank history: #11 in FY2021, #11 in FY2022, #14 in FY2023 and #12 in FY2024; down 1 since FY2024.
14	CSI Aviation, Inc. Top agencies DHS (Department of Homeland Security) DOJ (Department of Justice)	$656,365,226	1.1%	Rank history: not on the FY2021–FY2022 lists, #44 in FY2023 and #23 in FY2024; up 9 since FY2024.
15	Securitas Electronic Security Inc. 2 awardees, including Paragon Systems Inc. Top agencies DHS (Department of Homeland Security) HHS (Department of Health and Human Services) DOJ (Department of Justice)	$599,900,424	1.0%	Rank history: not on the FY2021–FY2023 lists and #28 in FY2024; up 13 since FY2024.
16	Parsons Corporation 4 awardees, including Xator LLC, Ptsi Managed Services Inc. and Williams Electric Co Inc. Top agencies DOS (Department of State) USAF (Department of the Air Force) Smithsonian (Smithsonian Institution)	$567,650,561	1.0%	Rank history: not on the FY2021–FY2023 lists and #10 in FY2024; down 6 since FY2024.
17	Metropolitan Security Services, Inc. Top agencies AOUSC (Administrative Office of the U.S. Courts) DOJ (Department of Justice) GSA (General Services Administration)	$527,525,607	0.9%	Rank history: #33 in FY2021, #25 in FY2022, #29 in FY2023 and #17 in FY2024; unchanged since FY2024.
18	Arctic Slope Regional Corporation 12 awardees, including Asrc Federal Field Services, LLC, Asrc Federal Facilities Logistics LLC and Netcentric Technology, LLC Top agencies USAF (Department of the Air Force) NASA (National Aeronautics and Space Administration) DHS (Department of Homeland Security)	$448,234,566	0.8%	Rank history: #28 in FY2021, #28 in FY2022, #25 in FY2023 and #25 in FY2024; up 7 since FY2024.
19	Fedex Corp 2 awardees, including Fedex Supply Chain Distribution System, Inc. Top agencies VA (Department of Veterans Affairs)	$402,769,179	0.7%	Rank history: #25 in FY2021, #22 in FY2022, #24 in FY2023 and #24 in FY2024; up 5 since FY2024.
20	General Dynamics Corporation 7 awardees, including General Dynamics Information Technology, Inc., General Dynamics OTS (Wilkes Barre), LLC and General Dynamics Land Systems Inc. Top agencies Army (Department of the Army) Navy (Department of the Navy) USAF (Department of the Air Force)	$389,255,668	0.7%	Rank history: #29 in FY2021, #17 in FY2022, #9 in FY2023 and #16 in FY2024; down 4 since FY2024.
21	Leidos Holdings, Inc. 8 awardees, including Leidos, Inc., Hanford Mission Integration Solutions, LLC and Leidos Security Detection & Automation, Inc. Top agencies NSF (National Science Foundation) DOE (Department of Energy) Army (Department of the Army)	$371,461,200	0.6%	Rank history: #20 in FY2021, #21 in FY2022, #22 in FY2023 and #21 in FY2024; unchanged since FY2024.
22	Triple Canopy Inc. Top agencies DHS (Department of Homeland Security) Army (Department of the Army) DOS (Department of State)	$364,118,139	0.6%	Rank history: #12 in FY2021, #10 in FY2022, #18 in FY2023 and #32 in FY2024; up 10 since FY2024.
23	Corecivic, Inc. Top agencies DHS (Department of Homeland Security) DOJ (Department of Justice)	$315,397,445	0.5%	Rank history: #31 in FY2021, #26 in FY2022, #38 in FY2023 and #40 in FY2024; up 17 since FY2024.
24	CACI International Inc. 4 awardees, including Caci, Inc. - Federal Top agencies DCSA (Defense Counterintelligence and Security Agency) USAF (Department of the Air Force) DHS (Department of Homeland Security)	$295,544,101	0.5%	Rank history: #22 in FY2021, #38 in FY2022, #30 in FY2023 and #31 in FY2024; up 7 since FY2024.
25	Peraton Risk Decision Inc. Top agencies DCSA (Defense Counterintelligence and Security Agency) DHS (Department of Homeland Security)	$293,181,902	0.5%	Rank history: not on the FY2021–FY2023 lists and #51 in FY2024; up 26 since FY2024.
26	Nana Regional Corporation, Inc. 13 awardees, including Akima Intra-Data, LLC, Akima Global Services, LLC and Akima Global Logistics, LLC Top agencies USAF (Department of the Air Force) Army (Department of the Army) DHS (Department of Homeland Security)	$269,350,021	0.5%	Rank history: #21 in FY2021, #29 in FY2022, #31 in FY2023 and #44 in FY2024; up 18 since FY2024.
27	Peckham Vocational Industries Inc. Top agencies DOS (Department of State) DLA (Defense Logistics Agency) HHS (Department of Health and Human Services)	$260,707,500	0.4%	Rank history: #69 in FY2021, #69 in FY2022, #54 in FY2023 and #35 in FY2024; up 8 since FY2024.
28	Loyalty Support Services Top agencies Army (Department of the Army)	$220,781,102	0.4%	Rank history: #59 in FY2021, #55 in FY2022, #58 in FY2023 and #57 in FY2024; up 29 since FY2024.
29	Skookum Educational Programs Top agencies Navy (Department of the Navy) Army (Department of the Army) DOE (Department of Energy)	$208,198,555	0.4%	Rank history: #40 in FY2021, #33 in FY2022, #36 in FY2023 and #38 in FY2024; up 9 since FY2024.
30	ECC International, LLC Top agencies USAF (Department of the Air Force)	$200,052,508	0.3%	Rank history: not on the FY2021–FY2024 lists; new.
31	Akima Facilities Operations LLC Top agencies Army (Department of the Army) HHS (Department of Health and Human Services) Navy (Department of the Navy)	$195,412,662	0.3%	Rank history: not on the FY2021–FY2022 lists, #63 in FY2023 and #47 in FY2024; up 16 since FY2024.
32	Professional Contract Services, Inc. Top agencies Army (Department of the Army) Navy (Department of the Navy) DHA (Defense Health Agency)	$189,833,031	0.3%	Rank history: #47 in FY2021, #44 in FY2022, #43 in FY2023 and #43 in FY2024; up 11 since FY2024.
33	Chenega Global Protection, LLC Top agencies NASA (National Aeronautics and Space Administration) HHS (Department of Health and Human Services) Army (Department of the Army)	$186,976,840	0.3%	Rank history: not on the FY2021–FY2023 lists and #54 in FY2024; up 21 since FY2024.
34	J & J Maintenance Inc. Top agencies Army (Department of the Army) DHA (Defense Health Agency) DECA (Defense Commissary Agency)	$184,432,633	0.3%	Rank history: not on the FY2021–FY2023 lists and #50 in FY2024; up 16 since FY2024.
35	Inter-CON Security Systems Inc. Top agencies DOS (Department of State) DOJ (Department of Justice) GAO (Government Accountability Office)	$184,085,997	0.3%	Rank history: not on the FY2021–FY2023 lists and #49 in FY2024; up 14 since FY2024.
36	BC Partners LLP Through Gardaworld Federal Services LLC Top agencies DOS (Department of State) Army (Department of the Army) Navy (Department of the Navy)	$173,411,820	0.3%	Rank history: not on the FY2021–FY2022 lists, #57 in FY2023 and #41 in FY2024; up 5 since FY2024.
37	Mvm, Inc. Top agencies DHS (Department of Homeland Security)	$172,732,300	0.3%	Rank history: #46 in FY2021, #23 in FY2022, #32 in FY2023 and #36 in FY2024; down 1 since FY2024.
38	Akima Infrastructure Protection LLC Top agencies DHS (Department of Homeland Security)	$170,461,860	0.3%	Rank history: not on the FY2021–FY2024 lists; up 74 since FY2024.
39	Fleetcor Technologies Inc. Through Corporate Lodging Consultants, Inc. Top agencies DHS (Department of Homeland Security) USAF (Department of the Air Force) Army (Department of the Army)	$169,862,897	0.3%	Rank history: not on the FY2021–FY2024 lists; up 175 since FY2024.
40	Covenant Aviation Security, LLC 2 awardees Top agencies DHS (Department of Homeland Security)	$165,336,385	0.3%	Rank history: #50 in FY2021, #49 in FY2022, #48 in FY2023 and #45 in FY2024; up 5 since FY2024.
41	M.c. Dean, Inc. Top agencies DOD (Department of Defense) AOUSC (Administrative Office of the U.S. Courts) DOT (Department of Transportation)	$146,303,528	0.2%	Rank history: #60 in FY2021, #50 in FY2022, #55 in FY2023 and #53 in FY2024; up 12 since FY2024.
42	Loyal Source Government Services LLC Top agencies DHS (Department of Homeland Security) DHA (Defense Health Agency) Army (Department of the Army)	$138,791,951	0.2%	Rank history: #30 in FY2021, #45 in FY2022, #26 in FY2023 and #29 in FY2024; down 13 since FY2024.
43	Sallyport Global Holdings Inc. Top agencies USAF (Department of the Air Force)	$134,741,521	0.2%	Rank history: not on the FY2021–FY2024 lists; up 227 since FY2024.
44	Nova Space Solutions, LLC Top agencies NASA (National Aeronautics and Space Administration)	$129,847,904	0.2%	Rank history: not on the FY2021–FY2024 lists; new.
45	Pond Security Service GMBH Top agencies Army (Department of the Army) DOS (Department of State) DECA (Defense Commissary Agency)	$128,652,490	0.2%	Rank history: #48 in FY2021, #46 in FY2022, #51 in FY2023 and #55 in FY2024; up 10 since FY2024.
46	Pride Industries Top agencies USAF (Department of the Air Force) Treasury (Department of the Treasury) Army (Department of the Army)	$126,435,519	0.2%	Rank history: #32 in FY2021, #31 in FY2022, #33 in FY2023 and #37 in FY2024; down 9 since FY2024.
47	Kerberos International Inc. Top agencies DHS (Department of Homeland Security) DOI (Department of the Interior)	$122,000,938	0.2%	Rank history: not on the FY2021–FY2022 lists, #92 in FY2023 and #56 in FY2024; up 9 since FY2024.
48	CGI Federal Inc. Top agencies DOJ (Department of Justice) DOS (Department of State)	$120,981,697	0.2%	Rank history: not on the FY2021–FY2023 lists and #65 in FY2024; up 17 since FY2024.
49	Centerra Group, LLC Top agencies AOUSC (Administrative Office of the U.S. Courts) DOE (Department of Energy) DHS (Department of Homeland Security)	$118,755,443	0.2%	Rank history: not on the FY2021–FY2023 lists and #48 in FY2024; down 1 since FY2024.
50	Universal Protection Service, Limited Partnership Top agencies DHS (Department of Homeland Security) Smithsonian (Smithsonian Institution) DOS (Department of State)	$117,611,473	0.2%	Rank history: not on the FY2021–FY2024 lists; up 61 since FY2024.
51	Paragon Professional Services LLC Top agencies DHS (Department of Homeland Security) DOS (Department of State)	$115,196,524	0.2%	Rank history: not on the FY2021–FY2022 lists, #64 in FY2023 and #72 in FY2024; up 21 since FY2024.
52	Serco Inc 2 awardees Top agencies Navy (Department of the Navy) USAF (Department of the Air Force)	$104,669,504	0.2%	Rank history: not on the FY2021–FY2023 lists and #60 in FY2024; up 8 since FY2024.
53	Cotton Commercial Usa, Inc. Top agencies DHS (Department of Homeland Security)	$101,351,626	0.2%	Rank history: #24 in FY2021, not on the FY2022–FY2023 lists and #61 in FY2024; up 8 since FY2024.
54	Jones Lang Lasalle Americas, Inc. Top agencies GSA (General Services Administration) DECA (Defense Commissary Agency) AOUSC (Administrative Office of the U.S. Courts)	$98,390,769	0.2%	Rank history: not on the FY2021–FY2023 lists and #58 in FY2024; up 4 since FY2024.
55	Teamstaff Inc. Through DLH Solutions Inc. Top agencies VA (Department of Veterans Affairs)	$91,620,401	0.2%	Rank history: #81 in FY2021, #65 in FY2022, #46 in FY2023 and #46 in FY2024; down 9 since FY2024.
56	Bradley Technologies Inc. Top agencies DHS (Department of Homeland Security) CSOSA (Court Services and Offender Supervision Agency) Army (Department of the Army)	$89,516,529	0.2%	Rank history: not on the FY2021–FY2023 lists and #86 in FY2024; up 30 since FY2024.
57	G4S Secure Solutions (USA) Inc. Top agencies DHS (Department of Homeland Security)	$89,344,003	0.2%	Rank history: not on the FY2021–FY2024 lists; up 61 since FY2024.
58	CDA Incorporated Top agencies DHS (Department of Homeland Security)	$89,124,916	0.2%	Rank history: not on the FY2021–FY2023 lists and #97 in FY2024; up 39 since FY2024.
59	Melwood Horticultural Training Center, Inc. Top agencies Army (Department of the Army) Navy (Department of the Navy) USDA (Department of Agriculture)	$86,406,397	0.1%	Rank history: #63 in FY2021, #57 in FY2022, #72 in FY2023 and #64 in FY2024; up 5 since FY2024.
60	Emcor Group Inc. 4 awardees, including Emcor Government Services, Inc., Mesa Energy Systems, Inc. and S A Comunale Co Inc. Top agencies GSA (General Services Administration) NARA (National Archives and Records Administration) DOE (Department of Energy)	$85,414,346	0.1%	Rank history: not on the FY2021–FY2022 lists, #76 in FY2023 and #73 in FY2024; up 13 since FY2024.
61	Servicesource Inc. Top agencies WHS (DOD Washington Headquarters Service) Treasury (Department of the Treasury) DOJ (Department of Justice)	$84,080,366	0.1%	Rank history: #89 in FY2021, #61 in FY2022, #71 in FY2023 and #70 in FY2024; up 9 since FY2024.
62	BAE Systems 3 awardees, including BAE Systems Ordnance Systems Inc. and BAE Systems Technology Solutions & Services Inc. Top agencies Army (Department of the Army)	$82,324,610	0.1%	Rank history: not on the FY2021–FY2023 lists and #39 in FY2024; down 23 since FY2024.
63	AED Stratecon LLC Top agencies DOS (Department of State)	$81,685,728	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
64	Action Facilities Management Inc. Top agencies GSA (General Services Administration) DOJ (Department of Justice) Army (Department of the Army)	$79,246,148	0.1%	Rank history: not on the FY2021–FY2022 lists, #83 in FY2023 and #81 in FY2024; up 17 since FY2024.
65	Nve, Inc. Top agencies DOS (Department of State) Treasury (Department of the Treasury) USDA (Department of Agriculture)	$77,319,103	0.1%	Rank history: not on the FY2021 list, #76 in FY2022, #84 in FY2023 and not on the FY2024 list; up 54 since FY2024.
66	Vendtech-Sgi LLC Top agencies DHS (Department of Homeland Security)	$77,256,082	0.1%	Rank history: #74 in FY2021, #78 in FY2022, #73 in FY2023 and #75 in FY2024; up 9 since FY2024.
67	Pegasus Support Services LLC Top agencies Army (Department of the Army) GSA (General Services Administration) DHS (Department of Homeland Security)	$76,792,548	0.1%	Rank history: not on the FY2021–FY2023 lists and #78 in FY2024; up 11 since FY2024.
68	Chugach Logistics and Facility Services JV, LLC Top agencies USAF (Department of the Air Force) Navy (Department of the Navy)	$76,048,253	0.1%	Rank history: not on the FY2021–FY2024 lists; up 56 since FY2024.
69	T&H Services, LLC Top agencies Army (Department of the Army) DOS (Department of State) Navy (Department of the Navy)	$73,755,175	0.1%	Rank history: not on the FY2021–FY2024 lists; up 156 since FY2024.
70	Fedcap Rehabilitation Services, Inc. Top agencies GSA (General Services Administration) SSA (Social Security Administration) DOI (Department of the Interior)	$72,706,565	0.1%	Rank history: not on the FY2021–FY2022 lists, #81 in FY2023 and #95 in FY2024; up 25 since FY2024.
71	Equifax Workforce Solutions LLC Top agencies SSA (Social Security Administration) DCSA (Defense Counterintelligence and Security Agency) DOS (Department of State)	$71,932,696	0.1%	Rank history: not on the FY2021–FY2024 lists; up 133 since FY2024.
72	Inussuk A / S Top agencies USAF (Department of the Air Force) DHA (Defense Health Agency) Navy (Department of the Navy)	$71,577,757	0.1%	Rank history: not on the FY2021–FY2024 lists; up 133 since FY2024.
73	Kgjj Engineering Solutions, LLC Top agencies Army (Department of the Army) Navy (Department of the Navy)	$71,478,742	0.1%	Rank history: not on the FY2021–FY2024 lists; up 84 since FY2024.
74	Koa Lani JV LLC Top agencies Navy (Department of the Navy)	$71,078,627	0.1%	Rank history: not on the FY2021 list, #60 in FY2022, #70 in FY2023 and #83 in FY2024; up 9 since FY2024.
75	Didlake Inc. Top agencies Navy (Department of the Navy) WHS (DOD Washington Headquarters Service) DOE (Department of Energy)	$71,038,357	0.1%	Rank history: #71 in FY2021, #59 in FY2022, #77 in FY2023 and #76 in FY2024; up 1 since FY2024.
76	Tiya Services L.L.C. Top agencies Army (Department of the Army)	$70,551,971	0.1%	Rank history: not on the FY2021–FY2023 lists and #80 in FY2024; up 4 since FY2024.
77	Brillient Corporation Top agencies DHS (Department of Homeland Security)	$69,658,268	0.1%	Rank history: #58 in FY2021, not on the FY2022 list, #74 in FY2023 and #85 in FY2024; up 8 since FY2024.
78	South Dade Air Conditioning & Refrigeration Inc. Top agencies GSA (General Services Administration) AOUSC (Administrative Office of the U.S. Courts) EPA (Environmental Protection Agency)	$65,873,828	0.1%	Rank history: not on the FY2021–FY2023 lists and #100 in FY2024; up 22 since FY2024.
79	Chimes International, Ltd. Through Chimes District of Columbia Inc. Top agencies Army (Department of the Army) WHS (DOD Washington Headquarters Service) USAF (Department of the Air Force)	$65,371,961	0.1%	Rank history: not on the FY2021–FY2024 lists; up 87 since FY2024.
80	Global Connections To Employment, Inc. Top agencies Army (Department of the Army) USAF (Department of the Air Force) Navy (Department of the Navy)	$64,809,709	0.1%	Rank history: not on the FY2021–FY2023 lists and #98 in FY2024; up 18 since FY2024.
81	Bering Straits Professional Services, LLC Top agencies Navy (Department of the Navy) DOT (Department of Transportation) HHS (Department of Health and Human Services)	$63,957,491	0.1%	Rank history: not on the FY2021–FY2024 lists; up 86 since FY2024.
82	Pond Constructors Inc. Top agencies DLA (Defense Logistics Agency)	$62,987,632	0.1%	Rank history: not on the FY2021–FY2022 lists, #87 in FY2023 and #79 in FY2024; down 3 since FY2024.
83	Nelson Refrigeration Inc. Top agencies DECA (Defense Commissary Agency)	$62,873,207	0.1%	Rank history: not on the FY2021–FY2024 lists; up 44 since FY2024.
84	CW Resources, Inc. Top agencies DECA (Defense Commissary Agency) USAF (Department of the Air Force) Navy (Department of the Navy)	$62,834,702	0.1%	Rank history: not on the FY2021–FY2024 lists; up 54 since FY2024.
85	Ho-Chunk, Inc. 5 awardees, including HCI Management Services Company, Dynamic-Hhs JV, LLC and Ho-Chunk Shared Services Company Top agencies DOS (Department of State) DHA (Defense Health Agency) USAF (Department of the Air Force)	$61,345,221	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
86	Trace Systems, Inc. Top agencies Army (Department of the Army)	$59,693,216	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
87	Akima Global Services, LLC Top agencies DHS (Department of Homeland Security)	$58,852,936	0.1%	Rank history: not on the FY2021–FY2023 lists and #66 in FY2024; down 21 since FY2024.
88	Red River Science & Technology, LLC Top agencies Army (Department of the Army)	$58,623,148	0.1%	Rank history: not on the FY2021–FY2024 lists; up 70 since FY2024.
89	Four Seasons Environmental Inc. Top agencies HHS (Department of Health and Human Services) DLA (Defense Logistics Agency) Navy (Department of the Navy)	$57,437,890	0.1%	Rank history: not on the FY2021–FY2024 lists; up 19 since FY2024.
90	Dsc-Emi Maintenance Solutions, LLC Top agencies Navy (Department of the Navy) Army (Department of the Army) DODEA (Department of Defense Education Activity)	$55,795,322	0.1%	Rank history: not on the FY2021–FY2023 lists and #94 in FY2024; up 4 since FY2024.
91	The Building People LLC Top agencies DOE (Department of Energy) GSA (General Services Administration) DOI (Department of the Interior)	$55,646,427	0.1%	Rank history: not on the FY2021–FY2023 lists and #88 in FY2024; down 3 since FY2024.
92	Readiness Management Support LC Top agencies USAF (Department of the Air Force)	$55,415,859	0.1%	Rank history: not on the FY2021–FY2024 lists; up 22 since FY2024.
93	Hospital Housekeeping Systems LLC Top agencies Army (Department of the Army) DHA (Defense Health Agency) USAF (Department of the Air Force)	$55,383,348	0.1%	Rank history: not on the FY2021–FY2024 lists; up 126 since FY2024.
94	Afognak Native Corporation 3 awardees, including "Alutiiq Logistics & Maintenance Services, Llc" and Alutiiq Solutions, LLC Top agencies Navy (Department of the Navy) DOS (Department of State) DOE (Department of Energy)	$54,200,204	0.1%	Rank history: not on the FY2021–FY2024 lists; up 42 since FY2024.
95	Atkins Nuclear Secured Holdings Corporation Through Isotek Systems, LLC Top agencies DOE (Department of Energy)	$54,068,923	0.1%	Rank history: not on the FY2021–FY2023 lists and #99 in FY2024; up 4 since FY2024.
96	Tunista Logistics Solutions LLC Top agencies USAF (Department of the Air Force) Army (Department of the Army) Navy (Department of the Navy)	$52,860,721	0.1%	Rank history: not on the FY2021–FY2024 lists; up 57 since FY2024.
97	Electronic Metrology Laboratory, LLC Top agencies GSA (General Services Administration) SSA (Social Security Administration) CFPB (Consumer Financial Protection Bureau)	$52,502,271	0.1%	Rank history: not on the FY2021–FY2024 lists; up 10 since FY2024.
98	King & George, LLC Top agencies Army (Department of the Army) GSA (General Services Administration) DOT (Department of Transportation)	$52,376,813	0.1%	Rank history: #65 in FY2021, #54 in FY2022, #62 in FY2023 and not on the FY2024 list; up 17 since FY2024.
99	Tatitlek Corporation Through Tatitlek Technologies, LLC Top agencies DOS (Department of State)	$51,901,957	0.1%	Rank history: not on the FY2021–FY2024 lists; up 7 since FY2024.
100	Simmons & Golden Security LLC Top agencies DHS (Department of Homeland Security) DOE (Department of Energy)	$51,567,184	0.1%	Rank history: not on the FY2021–FY2024 lists; up 194 since FY2024.

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100 of 8,257 contractors listed here. See the rest on GovTribe.

Rankings for the codes under NAICS 561

Code	Net obligations	Largest contractor
5612 Facilities Support Services	$38,456,980,411	Honeywell International Inc.
5616 Investigation and Security Services	$7,643,710,344	Securitas Electronic Security Inc.
5617 Services to Buildings and Dwellings	$2,515,723,941	AED Stratecon LLC
5614 Business Support Services	$2,307,609,308	Maximus Federal Services, Inc.
5619 Other Support Services	$1,862,826,227	Lockheed Martin Corporation
5613 Employment Services	$917,592,770	Loyal Source Government Services LLC
5615 Travel Arrangement and Reservation Services	$829,046,888	CSI Aviation, Inc.
5611 Office Administrative Services	$655,107,153	Trace Systems, 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 $59.3 billion obligated before deobligations, so they never pass 100%.
Parent companies: each action counts under the ultimate parent its award record names, or under the awardee when it names none, so no dollar counts twice. Parents of the same name (Inc., LLC and the like aside) count as one company, since FPDS records a company's parent under more than one UEI over time. GovTribe corrects a few parents and names by hand; see the corrections.
Fiscal year 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 561 contractors in FY2025?

1. Honeywell International Inc. ($7.8B), 2. Triad National Security LLC ($5.09B), 3. Ut-Battelle LLC ($2.68B), 4. Consolidated Nuclear Security, LLC ($2.54B), 5. Fluor Corporation ($2.35B), 6. V2X, Inc. ($2.33B), 7. Pantexas Deterrence, LLC ($1.92B), 8. Amentum Holdings, Inc. ($1.81B), 9. KBR Wyle Services LLC ($1.21B), 10. Maximus Federal Services, Inc. ($1.11B).

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