Top 100 Contractors in NAICS 561: Administrative and Support Services, FY2024

Name: Top 100 Contractors in NAICS 561: Administrative and Support Services, FY2024
Creator: GovTribe

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

The top 10 won 43% of FY2024 NAICS 561 contract dollars

Contract obligations: $56,225,163,439 Net of deobligations, by contracts coded NAICS 561 or a code under it
Contractors: 9,163 Parent companies with an obligation
Largest contractor: Honeywell International Inc. $6.09 billion, 10.0% 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. 12 awardees, including National Technology & Engineering Solutions of Sandia, LLC, Honeywell Federal Manufacturing & Technologies, LLC and Vindicator Technologies, Inc. Top agencies DOE (Department of Energy) USAF (Department of the Air Force) Navy (Department of the Navy)	$6,093,107,083	10.0%	Rank history: #1 in FY2021, #1 in FY2022, #1 in FY2023 and #1 in FY2025; unchanged since FY2023.
2	Triad National Security LLC Top agencies DOE (Department of Energy) USAF (Department of the Air Force) DTRA (Defense Threat Reduction Agency)	$5,162,951,227	8.5%	Rank history: #2 in FY2021, #2 in FY2022, #2 in FY2023 and #2 in FY2025; unchanged since FY2023.
3	Consolidated Nuclear Security, LLC Top agencies DOE (Department of Energy) USAF (Department of the Air Force) OSD (Office of the Secretary of Defense)	$3,649,011,102	6.0%	Rank history: #4 in FY2021, #4 in FY2022, #3 in FY2023 and #4 in FY2025; unchanged since FY2023.
4	Ut-Battelle LLC Top agencies DOE (Department of Energy)	$2,546,284,451	4.2%	Rank history: #5 in FY2021, #5 in FY2022, #5 in FY2023 and #3 in FY2025; up 1 since FY2023.
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) Army (Department of the Army) USAF (Department of the Air Force)	$2,347,130,965	3.8%	Rank history: #15 in FY2021, #15 in FY2022, #21 in FY2023 and #5 in FY2025; up 16 since FY2023.
6	V2X, Inc. 3 awardees, including V2X Systems LLC, Advantor Systems II LLC and Vectrus Services A / S Top agencies Army (Department of the Army) USAF (Department of the Air Force) DOS (Department of State)	$1,820,618,245	3.0%	Rank history: not on the FY2021–FY2023 lists and #6 in FY2025; new.
7	KBR Wyle Services LLC 3 awardees, including KBR Services, LLC Top agencies Army (Department of the Army) Navy (Department of the Navy) USAF (Department of the Air Force)	$1,540,707,995	2.5%	Rank history: not on the FY2021–FY2023 lists and #9 in FY2025; new.
8	Amentum Services, Inc. 12 awardees, including PAE Government Services, Inc., Dzsp 21 LLC and Syncom Space Services LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force) Navy (Department of the Navy)	$1,134,767,587	1.9%	Rank history: #9 in FY2021, #8 in FY2022, #11 in FY2023 and not on the FY2025 list; up 3 since FY2023.
9	Mission Support & Test Services LLC Top agencies DOE (Department of Energy) Army (Department of the Army) USAF (Department of the Air Force)	$1,113,406,099	1.8%	Rank history: #10 in FY2021, #9 in FY2022, #10 in FY2023 and #11 in FY2025; up 1 since FY2023.
10	Parsons Corporation 3 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)	$1,040,210,466	1.7%	Rank history: not on the FY2021–FY2023 lists and #16 in FY2025; new.
11	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)	$818,511,641	1.3%	Rank history: #14 in FY2021, #12 in FY2022, #12 in FY2023 and #12 in FY2025; up 1 since FY2023.
12	Lockheed Martin Corporation 4 awardees, including Sikorsky Aircraft Corporation Top agencies USSOCOM (United States Special Operations Command) USAF (Department of the Air Force) Army (Department of the Army)	$807,053,790	1.3%	Rank history: #11 in FY2021, #11 in FY2022, #14 in FY2023 and #13 in FY2025; up 2 since FY2023.
13	Maximus Federal Services, Inc. Top agencies HHS (Department of Health and Human Services) DHS (Department of Homeland Security) Treasury (Department of the Treasury)	$753,718,721	1.2%	Rank history: not on the FY2021–FY2023 lists and #10 in FY2025; new.
14	National Technology & Engineering Solutions of Sandia, LLC Top agencies DOE (Department of Energy) USAF (Department of the Air Force)	$738,382,472	1.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
15	RTX Corporation 3 awardees, including Raytheon Company Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$702,287,865	1.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
16	General Dynamics Corporation 8 awardees, including General Dynamics OTS (Wilkes Barre), LLC, General Dynamics Information Technology, Inc. and General Dynamics Mission Systems, Inc. Top agencies Army (Department of the Army) Navy (Department of the Navy) USAF (Department of the Air Force)	$633,387,826	1.0%	Rank history: #29 in FY2021, #17 in FY2022, #9 in FY2023 and #20 in FY2025; down 7 since FY2023.
17	Metropolitan Security Services, Inc. Top agencies AOUSC (Administrative Office of the U.S. Courts) DOJ (Department of Justice) GSA (General Services Administration)	$503,715,235	0.8%	Rank history: #33 in FY2021, #25 in FY2022, #29 in FY2023 and #17 in FY2025; up 12 since FY2023.
18	KBR Services LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force) Navy (Department of the Navy)	$479,410,890	0.8%	Rank history: not on the FY2021 list, #43 in FY2022, #7 in FY2023 and not on the FY2025 list; down 11 since FY2023.
19	Amentum Parsons Logistics Services LLC Top agencies Army (Department of the Army)	$478,995,037	0.8%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; up 147 since FY2023.
20	Vectrus Systems Corporation 4 awardees, including V2X Systems LLC, Vectrus-J&J Facilities Support, LLC and Vectrus Federal Services GMBH Top agencies Army (Department of the Army) Navy (Department of the Navy) USAF (Department of the Air Force)	$436,786,148	0.7%	Rank history: #6 in FY2021, #7 in FY2022, #4 in FY2023 and not on the FY2025 list; down 16 since FY2023.
21	Leidos Holdings, Inc. 7 awardees, including Leidos, Inc., Leidos Biomedical Research Inc. and Leidos Security Detection & Automation, Inc. Top agencies NSF (National Science Foundation) HHS (Department of Health and Human Services) Army (Department of the Army)	$372,583,090	0.6%	Rank history: #20 in FY2021, #21 in FY2022, #22 in FY2023 and #21 in FY2025; up 1 since FY2023.
22	Family Endeavors, Inc. Top agencies HHS (Department of Health and Human Services)	$357,854,816	0.6%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
23	CSI Aviation, Inc. Top agencies DHS (Department of Homeland Security) DOJ (Department of Justice)	$344,672,788	0.6%	Rank history: not on the FY2021–FY2022 lists, #44 in FY2023 and #14 in FY2025; up 21 since FY2023.
24	Fedex Corp 2 awardees, including Fedex Supply Chain Distribution System, Inc. Top agencies VA (Department of Veterans Affairs) DOJ (Department of Justice)	$341,546,968	0.6%	Rank history: #25 in FY2021, #22 in FY2022, #24 in FY2023 and #19 in FY2025; unchanged since FY2023.
25	Arctic Slope Regional Corporation 8 awardees, including Asrc Federal Professional Services, LLC, Asrc Communications, Ltd. and Asrc Federal Facilities Logistics LLC Top agencies USAF (Department of the Air Force) DCSA (Defense Counterintelligence and Security Agency) NASA (National Aeronautics and Space Administration)	$319,148,573	0.5%	Rank history: #28 in FY2021, #28 in FY2022, #25 in FY2023 and #18 in FY2025; unchanged since FY2023.
26	Securitas AB 5 awardees, including Paragon Systems Inc. and Securitas OY Top agencies DHS (Department of Homeland Security) HHS (Department of Health and Human Services) DOJ (Department of Justice)	$308,097,834	0.5%	Rank history: #13 in FY2021, #14 in FY2022, #16 in FY2023 and not on the FY2025 list; down 10 since FY2023.
27	Omniplex World Services Corp 2 awardees, including Triple Canopy Inc. Top agencies DHS (Department of Homeland Security) Army (Department of the Army) DOS (Department of State)	$301,028,602	0.5%	Rank history: not on the FY2021–FY2022 lists, #20 in FY2023 and not on the FY2025 list; down 7 since FY2023.
28	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)	$297,395,130	0.5%	Rank history: not on the FY2021–FY2023 lists and #15 in FY2025; new.
29	Loyal Source Government Services LLC 2 awardees Top agencies DHS (Department of Homeland Security) DHA (Defense Health Agency) VA (Department of Veterans Affairs)	$282,977,069	0.5%	Rank history: #30 in FY2021, #45 in FY2022, #26 in FY2023 and #42 in FY2025; down 3 since FY2023.
30	Michael Baker International, LLC Through Sallyport Global Holdings Inc. Top agencies USAF (Department of the Air Force)	$247,376,437	0.4%	Rank history: #34 in FY2021, #19 in FY2022, #23 in FY2023 and not on the FY2025 list; down 7 since FY2023.
31	CACI International Inc. 6 awardees, including Caci, Inc. - Federal Top agencies DCSA (Defense Counterintelligence and Security Agency) DHS (Department of Homeland Security) USAF (Department of the Air Force)	$242,270,677	0.4%	Rank history: #22 in FY2021, #38 in FY2022, #30 in FY2023 and #24 in FY2025; down 1 since FY2023.
32	Triple Canopy Inc. Top agencies DHS (Department of Homeland Security) DOS (Department of State) Army (Department of the Army)	$234,520,064	0.4%	Rank history: #12 in FY2021, #10 in FY2022, #18 in FY2023 and #22 in FY2025; down 14 since FY2023.
33	Amentum Holdings, Inc. 9 awardees, including Amentum Services, Inc., PAE Government Services, Inc. and Syncom Space Services LLC Top agencies Army (Department of the Army) DOS (Department of State) NASA (National Aeronautics and Space Administration)	$232,914,507	0.4%	Rank history: not on the FY2021–FY2023 lists and #8 in FY2025; new.
34	Inspiritec Inc. Top agencies DHRA (Defense Human Resources Activity) Army (Department of the Army)	$227,124,510	0.4%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
35	Peckham Vocational Industries Inc. 2 awardees Top agencies DOS (Department of State) DLA (Defense Logistics Agency) HHS (Department of Health and Human Services)	$222,051,138	0.4%	Rank history: #69 in FY2021, #69 in FY2022, #54 in FY2023 and #27 in FY2025; up 19 since FY2023.
36	Mvm, Inc. Top agencies DHS (Department of Homeland Security)	$214,389,050	0.4%	Rank history: #46 in FY2021, #23 in FY2022, #32 in FY2023 and #37 in FY2025; down 4 since FY2023.
37	Pride Industries Top agencies Army (Department of the Army) USAF (Department of the Air Force) Treasury (Department of the Treasury)	$209,915,286	0.3%	Rank history: #32 in FY2021, #31 in FY2022, #33 in FY2023 and #46 in FY2025; down 4 since FY2023.
38	Skookum Educational Programs Top agencies Army (Department of the Army) Navy (Department of the Navy) DHS (Department of Homeland Security)	$201,941,248	0.3%	Rank history: #40 in FY2021, #33 in FY2022, #36 in FY2023 and #29 in FY2025; down 2 since FY2023.
39	BAE Systems 2 awardees, including BAE Systems Ordnance Systems Inc. Top agencies Army (Department of the Army)	$188,570,587	0.3%	Rank history: not on the FY2021–FY2023 lists and #62 in FY2025; new.
40	Corecivic, Inc. Top agencies DHS (Department of Homeland Security) DOJ (Department of Justice)	$186,304,954	0.3%	Rank history: #31 in FY2021, #26 in FY2022, #38 in FY2023 and #23 in FY2025; down 2 since FY2023.
41	BC Partners LLP Through Gardaworld Federal Services LLC Top agencies DOS (Department of State) Army (Department of the Army)	$182,870,499	0.3%	Rank history: not on the FY2021–FY2022 lists, #57 in FY2023 and #36 in FY2025; up 16 since FY2023.
42	Savannah River Nuclear Solutions LLC Top agencies DOE (Department of Energy)	$175,500,785	0.3%	Rank history: #7 in FY2021, #6 in FY2022, #6 in FY2023 and not on the FY2025 list; down 36 since FY2023.
43	Professional Contract Services, Inc. Top agencies Army (Department of the Army) Navy (Department of the Navy) DHA (Defense Health Agency)	$170,639,034	0.3%	Rank history: #47 in FY2021, #44 in FY2022, #43 in FY2023 and #32 in FY2025; unchanged since FY2023.
44	Nana Regional Corporation Inc. 9 awardees, including Akima Intra-Data, LLC, Akima Global Services, LLC and Akima Range Readiness Operations LLC Top agencies USAF (Department of the Air Force) DHS (Department of Homeland Security) Army (Department of the Army)	$160,249,544	0.3%	Rank history: #21 in FY2021, #29 in FY2022, #31 in FY2023 and #26 in FY2025; down 13 since FY2023.
45	Covenant Aviation Security LLC Top agencies DHS (Department of Homeland Security) VA (Department of Veterans Affairs)	$156,021,127	0.3%	Rank history: #50 in FY2021, #49 in FY2022, #48 in FY2023 and #40 in FY2025; up 3 since FY2023.
46	Teamstaff Inc. Through DLH Solutions Inc. Top agencies VA (Department of Veterans Affairs)	$151,526,592	0.2%	Rank history: #81 in FY2021, #65 in FY2022, #46 in FY2023 and #55 in FY2025; unchanged since FY2023.
47	Akima Facilities Operations LLC Top agencies Army (Department of the Army) HHS (Department of Health and Human Services) Navy (Department of the Navy)	$150,884,717	0.2%	Rank history: not on the FY2021–FY2022 lists, #63 in FY2023 and #31 in FY2025; up 16 since FY2023.
48	Centerra Group, LLC Top agencies DHS (Department of Homeland Security) DOE (Department of Energy) AOUSC (Administrative Office of the U.S. Courts)	$142,287,604	0.2%	Rank history: not on the FY2021–FY2023 lists and #49 in FY2025; new.
49	Inter-CON Security Systems Inc. Top agencies DOS (Department of State) DOJ (Department of Justice) DOI (Department of the Interior)	$140,802,708	0.2%	Rank history: not on the FY2021–FY2023 lists and #35 in FY2025; new.
50	J & J Maintenance Inc. Top agencies Army (Department of the Army) DECA (Defense Commissary Agency) HHS (Department of Health and Human Services)	$132,637,384	0.2%	Rank history: not on the FY2021–FY2023 lists and #34 in FY2025; new.
51	Peraton Risk Decision Inc. Top agencies DCSA (Defense Counterintelligence and Security Agency) DHS (Department of Homeland Security)	$131,093,431	0.2%	Rank history: not on the FY2021–FY2023 lists and #25 in FY2025; new.
52	Amentum Technology, Inc. Top agencies Navy (Department of the Navy) NASA (National Aeronautics and Space Administration)	$127,173,836	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
53	M. C. Dean Inc. Through M.c. Dean, Inc. Top agencies DOD (Department of Defense) AOUSC (Administrative Office of the U.S. Courts) USAF (Department of the Air Force)	$126,427,030	0.2%	Rank history: #60 in FY2021, #50 in FY2022, #55 in FY2023 and #41 in FY2025; up 2 since FY2023.
54	Chenega Global Protection, LLC Top agencies NASA (National Aeronautics and Space Administration) Army (Department of the Army) HHS (Department of Health and Human Services)	$122,695,721	0.2%	Rank history: not on the FY2021–FY2023 lists and #33 in FY2025; new.
55	Pond Security Service GMBH Top agencies Army (Department of the Army) DOS (Department of State) DECA (Defense Commissary Agency)	$120,184,862	0.2%	Rank history: #48 in FY2021, #46 in FY2022, #51 in FY2023 and #45 in FY2025; down 4 since FY2023.
56	Kerberos International Inc. 2 awardees, including Acadia Protective Services II, LLC Top agencies DHS (Department of Homeland Security) DOI (Department of the Interior)	$110,168,712	0.2%	Rank history: not on the FY2021–FY2022 lists, #92 in FY2023 and #47 in FY2025; up 36 since FY2023.
57	Loyalty Support Services Top agencies Army (Department of the Army) DOD (Department of Defense)	$108,679,345	0.2%	Rank history: #59 in FY2021, #55 in FY2022, #58 in FY2023 and #28 in FY2025; up 1 since FY2023.
58	Jones Lang Lasalle Americas, Inc. 2 awardees Top agencies GSA (General Services Administration) DECA (Defense Commissary Agency) AOUSC (Administrative Office of the U.S. Courts)	$108,078,573	0.2%	Rank history: not on the FY2021–FY2023 lists and #54 in FY2025; new.
59	Deployed Services, LLC Top agencies HHS (Department of Health and Human Services)	$103,636,072	0.2%	Rank history: not on the FY2021–FY2022 lists, #50 in FY2023 and not on the FY2025 list; down 9 since FY2023.
60	Serco Inc Top agencies Navy (Department of the Navy) DLA (Defense Logistics Agency)	$101,282,461	0.2%	Rank history: not on the FY2021–FY2023 lists and #52 in FY2025; up 74 since FY2023.
61	Cotton Commercial Usa, Inc. Top agencies DHS (Department of Homeland Security)	$100,841,103	0.2%	Rank history: #24 in FY2021, not on the FY2022–FY2023 lists and #53 in FY2025; returned.
62	Identity Theft Guard Solutions, Inc. Top agencies OPM (Office of Personnel Management) DHS (Department of Homeland Security) GAO (Government Accountability Office)	$99,687,213	0.2%	Rank history: #77 in FY2021, #53 in FY2022, not on the FY2023 list and not on the FY2025 list; up 66 since FY2023.
63	HP Enterprise Services LLC 2 awardees, including Peraton Risk Decision Inc. and Cotiviti GOV Services, LLC Top agencies DCSA (Defense Counterintelligence and Security Agency) HHS (Department of Health and Human Services)	$94,629,316	0.2%	Rank history: not on the FY2021 list, #40 in FY2022, #34 in FY2023 and not on the FY2025 list; down 29 since FY2023.
64	Melwood Horticultural Training Center, Inc. Top agencies Navy (Department of the Navy) Army (Department of the Army) USDA (Department of Agriculture)	$89,989,628	0.1%	Rank history: #63 in FY2021, #57 in FY2022, #72 in FY2023 and #59 in FY2025; up 8 since FY2023.
65	CGI Federal Inc. Top agencies DOS (Department of State) DOJ (Department of Justice)	$89,260,399	0.1%	Rank history: not on the FY2021–FY2023 lists and #48 in FY2025; new.
66	Akima Global Services, LLC Top agencies DHS (Department of Homeland Security)	$87,715,488	0.1%	Rank history: not on the FY2021–FY2023 lists and #87 in FY2025; up 138 since FY2023.
67	Facility Services Management, Inc. Top agencies Army (Department of the Army) DHA (Defense Health Agency) NARA (National Archives and Records Administration)	$87,579,004	0.1%	Rank history: #72 in FY2021, #77 in FY2022, #60 in FY2023 and not on the FY2025 list; down 7 since FY2023.
68	Tlingit Haida Tribal Business Corporation 6 awardees, including T&H Services, LLC, Kira Training Services LLC and Kira Aviation Services LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force) Navy (Department of the Navy)	$86,901,490	0.1%	Rank history: #53 in FY2021, #42 in FY2022, #47 in FY2023 and not on the FY2025 list; down 21 since FY2023.
69	Chugach Alaska Corporation 6 awardees, including Defense Base Services, LLC, Chugach Consolidated Solutions, LLC and Wolf Creek Federal Services LLC Top agencies Navy (Department of the Navy) Army (Department of the Army) USDA (Department of Agriculture)	$85,570,344	0.1%	Rank history: #42 in FY2021, #41 in FY2022, #41 in FY2023 and not on the FY2025 list; down 28 since FY2023.
70	Servicesource Inc. Top agencies WHS (DOD Washington Headquarters Service) Treasury (Department of the Treasury) DOJ (Department of Justice)	$85,330,365	0.1%	Rank history: #89 in FY2021, #61 in FY2022, #71 in FY2023 and #61 in FY2025; up 1 since FY2023.
71	Asrc Federal Field Services, LLC Top agencies DHS (Department of Homeland Security) USAF (Department of the Air Force)	$84,061,135	0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
72	Paragon Professional Services LLC Top agencies DHS (Department of Homeland Security) DOS (Department of State)	$83,141,869	0.1%	Rank history: not on the FY2021–FY2022 lists, #64 in FY2023 and #51 in FY2025; down 8 since FY2023.
73	Emcor Group Inc. 3 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) GAO (Government Accountability Office)	$82,098,459	0.1%	Rank history: not on the FY2021–FY2022 lists, #76 in FY2023 and #60 in FY2025; up 3 since FY2023.
74	ITC Federal, LLC Top agencies DHS (Department of Homeland Security)	$81,729,932	0.1%	Rank history: not on the FY2021–FY2022 lists, #61 in FY2023 and not on the FY2025 list; down 13 since FY2023.
75	Vendtech-Sgi LLC Top agencies DHS (Department of Homeland Security)	$81,394,718	0.1%	Rank history: #74 in FY2021, #78 in FY2022, #73 in FY2023 and #66 in FY2025; down 2 since FY2023.
76	Didlake Inc. Top agencies Navy (Department of the Navy) WHS (DOD Washington Headquarters Service) DOE (Department of Energy)	$78,434,761	0.1%	Rank history: #71 in FY2021, #59 in FY2022, #77 in FY2023 and #75 in FY2025; up 1 since FY2023.
77	Guidehouse Inc. Through Aptim Federal Services, LLC Top agencies DLA (Defense Logistics Agency)	$75,509,338	0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
78	Pegasus Support Services LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force) DHS (Department of Homeland Security)	$74,809,174	0.1%	Rank history: not on the FY2021–FY2023 lists and #67 in FY2025; new.
79	Pond Constructors Inc. Top agencies DLA (Defense Logistics Agency) Army (Department of the Army)	$72,307,286	0.1%	Rank history: not on the FY2021–FY2022 lists, #87 in FY2023 and #82 in FY2025; up 8 since FY2023.
80	Tiya Services L.L.C. Top agencies Army (Department of the Army)	$72,130,138	0.1%	Rank history: not on the FY2021–FY2023 lists and #76 in FY2025; up 142 since FY2023.
81	Action Facilities Management Inc. 2 awardees, including Action Integrated Services LLC Top agencies GSA (General Services Administration) DOJ (Department of Justice) Army (Department of the Army)	$71,928,786	0.1%	Rank history: not on the FY2021–FY2022 lists, #83 in FY2023 and #64 in FY2025; up 2 since FY2023.
82	Weston Solutions Holdings, Inc. 2 awardees, including Weston Solutions, Inc. Top agencies DLA (Defense Logistics Agency) Army (Department of the Army) USAF (Department of the Air Force)	$71,719,355	0.1%	Rank history: not on the FY2021 list, #91 in FY2022, #67 in FY2023 and not on the FY2025 list; down 15 since FY2023.
83	Koa Lani JV LLC Top agencies Navy (Department of the Navy)	$70,612,465	0.1%	Rank history: not on the FY2021 list, #60 in FY2022, #70 in FY2023 and #74 in FY2025; down 13 since FY2023.
84	Syncom Space Services LLC Top agencies NASA (National Aeronautics and Space Administration)	$70,123,365	0.1%	Rank history: #35 in FY2021, #36 in FY2022, #45 in FY2023 and not on the FY2025 list; down 39 since FY2023.
85	Brillient Corporation Top agencies DHS (Department of Homeland Security) USDA (Department of Agriculture)	$68,138,153	0.1%	Rank history: #58 in FY2021, not on the FY2022 list, #74 in FY2023 and #77 in FY2025; down 11 since FY2023.
86	Bradley Technologies Inc. Top agencies DHS (Department of Homeland Security) JFK (John F. Kennedy Center for the Performing Arts) CSOSA (Court Services and Offender Supervision Agency)	$65,967,420	0.1%	Rank history: not on the FY2021–FY2023 lists and #56 in FY2025; up 52 since FY2023.
87	The Chenega Corporation 9 awardees, including Chenega Global Protection, LLC, Chenega Facilities Management LLC and Chenega Tri-Services, LLC Top agencies NASA (National Aeronautics and Space Administration) HHS (Department of Health and Human Services) Army (Department of the Army)	$63,945,450	0.1%	Rank history: #44 in FY2021, #32 in FY2022, #28 in FY2023 and not on the FY2025 list; down 59 since FY2023.
88	The Building People LLC Top agencies DOE (Department of Energy) GSA (General Services Administration) DHS (Department of Homeland Security)	$63,718,100	0.1%	Rank history: not on the FY2021–FY2023 lists and #91 in FY2025; up 20 since FY2023.
89	Kbr, Inc. 3 awardees, including KBR Wyle Services, LLC Top agencies Army (Department of the Army) DOT (Department of Transportation) AOUSC (Administrative Office of the U.S. Courts)	$62,232,672	0.1%	Rank history: #3 in FY2021, #3 in FY2022, #75 in FY2023 and not on the FY2025 list; down 14 since FY2023.
90	Trailboss Enterprises, Inc. Top agencies DHS (Department of Homeland Security)	$62,068,032	0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; up 65 since FY2023.
91	CGI Technologies and Solutions Inc. 2 awardees, including CGI Federal Inc. Top agencies DOJ (Department of Justice)	$61,432,381	0.1%	Rank history: not on the FY2021 list, #48 in FY2022, #49 in FY2023 and not on the FY2025 list; down 42 since FY2023.
92	KBR Diego Garcia, LLC Top agencies Navy (Department of the Navy) USAF (Department of the Air Force)	$60,668,569	0.1%	Rank history: #64 in FY2021, #100 in FY2022, #90 in FY2023 and not on the FY2025 list; down 2 since FY2023.
93	Nika Technologies Inc. Top agencies Army (Department of the Army)	$60,064,993	0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
94	Dsc-Emi Maintenance Solutions, LLC Top agencies Navy (Department of the Navy) Army (Department of the Army) DODEA (Department of Defense Education Activity)	$59,060,823	0.1%	Rank history: not on the FY2021–FY2023 lists and #90 in FY2025; up 7 since FY2023.
95	Fedcap Rehabilitation Services, Inc. 2 awardees Top agencies GSA (General Services Administration) SSA (Social Security Administration) DOI (Department of the Interior)	$56,926,088	0.1%	Rank history: not on the FY2021–FY2022 lists, #81 in FY2023 and #70 in FY2025; down 14 since FY2023.
96	Jacobs Engineering Group Inc. 2 awardees, including Amentum Technology, Inc. Top agencies Navy (Department of the Navy) NASA (National Aeronautics and Space Administration)	$55,029,254	0.1%	Rank history: #23 in FY2021, #24 in FY2022, #27 in FY2023 and not on the FY2025 list; down 69 since FY2023.
97	CDA Incorporated Top agencies DHS (Department of Homeland Security)	$55,029,165	0.1%	Rank history: not on the FY2021–FY2023 lists and #58 in FY2025; up 64 since FY2023.
98	Global Connections To Employment, Inc. Top agencies Army (Department of the Army) USAF (Department of the Air Force) Navy (Department of the Navy)	$55,019,418	0.1%	Rank history: not on the FY2021–FY2023 lists and #80 in FY2025; up 14 since FY2023.
99	Atkins Nuclear Secured Holdings Corporation Through Isotek Systems, LLC Top agencies DOE (Department of Energy)	$54,220,295	0.1%	Rank history: not on the FY2021–FY2023 lists and #95 in FY2025; new.
100	South Dade Air Conditioning & Refrigeration Inc. Top agencies GSA (General Services Administration) DHS (Department of Homeland Security) DOJ (Department of Justice)	$54,022,740	0.1%	Rank history: not on the FY2021–FY2023 lists and #78 in FY2025; up 27 since FY2023.

Show 75 more

100 of 9,163 contractors listed here. See the rest on GovTribe.

Rankings for the codes under NAICS 561

Code	Net obligations	Largest contractor
5612 Facilities Support Services	$39,719,406,747	Honeywell International Inc.
5616 Investigation and Security Services	$7,209,202,036	Metropolitan Security Services, Inc.
5619 Other Support Services	$2,513,585,482	Lockheed Martin Corporation
5617 Services to Buildings and Dwellings	$2,400,442,520	Didlake Inc.
5614 Business Support Services	$2,111,617,876	Maximus Federal Services, Inc.
5613 Employment Services	$1,009,290,422	Loyal Source Government Services LLC
5611 Office Administrative Services	$788,276,621	ITC Federal, LLC
5615 Travel Arrangement and Reservation Services	$473,341,736	CSI Aviation, 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 $61.1 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 561 contractors in FY2024?

1. Honeywell International Inc. ($6.09B), 2. Triad National Security LLC ($5.16B), 3. Consolidated Nuclear Security, LLC ($3.65B), 4. Ut-Battelle LLC ($2.55B), 5. Fluor Corporation ($2.35B), 6. V2X, Inc. ($1.82B), 7. KBR Wyle Services LLC ($1.54B), 8. Amentum Services, Inc. ($1.13B), 9. Mission Support & Test Services LLC ($1.11B), 10. Parsons Corporation ($1.04B).

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