Top 100 Contractors in NAICS 56: Administrative and Support and Waste Management and Remediation Services, FY2024

Name: Top 100 Contractors in NAICS 56: Administrative and Support and Waste Management and Remediation Services, FY2024
Creator: GovTribe

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

The top 10 won 39% of FY2024 NAICS 56 contract dollars

Contract obligations: $66,688,138,645 Net of deobligations, by contracts coded NAICS 56 or a code under it
Contractors: 11,700 Parent companies with an obligation
Largest contractor: Honeywell International Inc. $6.09 billion, 8.5% 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. 13 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)	$6,093,127,113	8.5%	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	7.2%	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	5.1%	Rank history: #4 in FY2021, #4 in FY2022, #3 in FY2023 and #6 in FY2025; unchanged since FY2023.
4	Fluor Corporation 6 awardees, including Savannah River Nuclear Solutions LLC, Fluor-Bwxt Portsmouth LLC and Fluor Intercontinental, Inc. Top agencies DOE (Department of Energy) Army (Department of the Army) USAF (Department of the Air Force)	$2,858,634,310	4.0%	Rank history: #9 in FY2021, #9 in FY2022, #16 in FY2023 and #4 in FY2025; up 12 since FY2023.
5	Ut-Battelle LLC Top agencies DOE (Department of Energy)	$2,546,284,451	3.5%	Rank history: #6 in FY2021, #6 in FY2022, #5 in FY2023 and #5 in FY2025; unchanged since FY2023.
6	Amentum Services, Inc. 16 awardees, including Washington River Protection Solutions LLC, Central Plateau Cleanup Company, LLC and PAE Government Services, Inc. Top agencies DOE (Department of Energy) Army (Department of the Army) USAF (Department of the Air Force)	$2,262,211,606	3.1%	Rank history: #5 in FY2021, #5 in FY2022, #8 in FY2023 and not on the FY2025 list; up 2 since FY2023.
7	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	2.5%	Rank history: not on the FY2021–FY2023 lists and #7 in FY2025; new.
8	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	2.1%	Rank history: not on the FY2021–FY2023 lists and #11 in FY2025; new.
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	1.5%	Rank history: #12 in FY2021, #10 in FY2022, #11 in FY2023 and #14 in FY2025; up 2 since FY2023.
10	Parsons Corporation 4 awardees, including Xator LLC, Parsons Government Services Inc. and Ptsi Managed Services Inc. Top agencies DOS (Department of State) OSD (Office of the Secretary of Defense) MDA (DOD Missile Defense Agency)	$1,055,239,426	1.5%	Rank history: not on the FY2021–FY2023 lists and #21 in FY2025; up 209 since FY2023.
11	Savannah River Mission Completion, LLC Top agencies DOE (Department of Energy)	$885,649,780	1.2%	Rank history: not on the FY2021 list, #17 in FY2022, #13 in FY2023 and #13 in FY2025; up 2 since FY2023.
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)	$818,511,641	1.1%	Rank history: #16 in FY2021, #13 in FY2022, #14 in FY2023 and #15 in FY2025; up 2 since FY2023.
13	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	1.1%	Rank history: #13 in FY2021, #12 in FY2022, #17 in FY2023 and #16 in FY2025; up 4 since FY2023.
14	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	1.0%	Rank history: not on the FY2021–FY2023 lists and #12 in FY2025; new.
15	National Technology & Engineering Solutions of Sandia, LLC Top agencies DOE (Department of Energy) USAF (Department of the Air Force)	$738,382,472	1.0%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
16	RTX Corporation 3 awardees, including Raytheon Company Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$702,287,865	1.0%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
17	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	0.9%	Rank history: #30 in FY2021, #19 in FY2022, #10 in FY2023 and #25 in FY2025; down 7 since FY2023.
18	United Cleanup Oak Ridge LLC Top agencies DOE (Department of Energy)	$592,276,416	0.8%	Rank history: not on the FY2021–FY2022 lists, #19 in FY2023 and #56 in FY2025; up 1 since FY2023.
19	Bechtel Corp 3 awardees, including Bechtel National, Inc. and Bechtel Parsons Blue Grass, A Joint Venture Top agencies Army (Department of the Army)	$545,815,024	0.8%	Rank history: #17 in FY2021, #14 in FY2022, #12 in FY2023 and #35 in FY2025; down 7 since FY2023.
20	Environmental Chemical Corporation 4 awardees, including ECC Constructors LLC and ECC Environmental LLC Top agencies Army (Department of the Army) EPA (Environmental Protection Agency) USAF (Department of the Air Force)	$537,533,311	0.7%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; up 87 since FY2023.
21	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	0.7%	Rank history: #36 in FY2021, #28 in FY2022, #32 in FY2023 and #22 in FY2025; up 11 since FY2023.
22	Jacobs Engineering Group Inc. 7 awardees, including Idaho Environmental Coalition LLC, Amentum Technology, Inc. and Ch2M Hill, Inc. Top agencies DOE (Department of Energy) Army (Department of the Army) Navy (Department of the Navy)	$495,387,924	0.7%	Rank history: #19 in FY2021, #24 in FY2022, #23 in FY2023 and not on the FY2025 list; up 1 since FY2023.
23	KBR Services LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force) Navy (Department of the Navy)	$479,410,890	0.7%	Rank history: not on the FY2021 list, #47 in FY2022, #7 in FY2023 and not on the FY2025 list; down 16 since FY2023.
24	Amentum Parsons Logistics Services LLC Top agencies Army (Department of the Army)	$478,995,037	0.7%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; up 175 since FY2023.
25	Sevenson Environmental Services, Inc. Top agencies EPA (Environmental Protection Agency) Army (Department of the Army) Navy (Department of the Navy)	$454,187,289	0.6%	Rank history: #92 in FY2021, #60 in FY2022, #74 in FY2023 and #38 in FY2025; up 49 since FY2023.
26	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	0.6%	Rank history: #7 in FY2021, #8 in FY2022, #4 in FY2023 and not on the FY2025 list; down 22 since FY2023.
27	Amentum Holdings, Inc. 13 awardees, including Washington River Protection Solutions LLC, Amentum Services, Inc. and PAE Government Services, Inc. Top agencies DOE (Department of Energy) Army (Department of the Army) DOS (Department of State)	$416,080,922	0.6%	Rank history: not on the FY2021–FY2023 lists and #3 in FY2025; new.
28	Leidos Holdings, Inc. 8 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)	$380,022,696	0.5%	Rank history: #22 in FY2021, #23 in FY2022, #27 in FY2023 and #24 in FY2025; down 1 since FY2023.
29	Family Endeavors, Inc. Top agencies HHS (Department of Health and Human Services)	$357,854,816	0.5%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
30	Bechtel Parsons Blue Grass, A Joint Venture Top agencies Army (Department of the Army)	$354,876,038	0.5%	Rank history: not on the FY2021–FY2023 lists and #30 in FY2025; new.
31	CSI Aviation, Inc. Top agencies DHS (Department of Homeland Security) DOJ (Department of Justice)	$344,672,788	0.5%	Rank history: not on the FY2021–FY2022 lists, #51 in FY2023 and #19 in FY2025; up 20 since FY2023.
32	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	0.5%	Rank history: #27 in FY2021, #25 in FY2022, #29 in FY2023 and #23 in FY2025; down 3 since FY2023.
33	Arctic Slope Regional Corporation 10 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)	$338,813,628	0.5%	Rank history: #25 in FY2021, #27 in FY2022, #26 in FY2023 and #18 in FY2025; down 7 since FY2023.
34	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	0.4%	Rank history: #15 in FY2021, #16 in FY2022, #20 in FY2023 and not on the FY2025 list; down 14 since FY2023.
35	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	0.4%	Rank history: not on the FY2021–FY2022 lists, #25 in FY2023 and not on the FY2025 list; down 10 since FY2023.
36	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	0.4%	Rank history: not on the FY2021–FY2023 lists and #20 in FY2025; new.
37	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	0.4%	Rank history: #31 in FY2021, #50 in FY2022, #30 in FY2023 and #53 in FY2025; down 7 since FY2023.
38	Michael Baker International, LLC Through Sallyport Global Holdings Inc. Top agencies USAF (Department of the Air Force)	$247,376,437	0.3%	Rank history: #37 in FY2021, #21 in FY2022, #28 in FY2023 and not on the FY2025 list; down 10 since FY2023.
39	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	0.3%	Rank history: #24 in FY2021, #41 in FY2022, #33 in FY2023 and #28 in FY2025; down 6 since FY2023.
40	Triple Canopy Inc. Top agencies DHS (Department of Homeland Security) DOS (Department of State) Army (Department of the Army)	$234,520,064	0.3%	Rank history: #14 in FY2021, #11 in FY2022, #22 in FY2023 and #26 in FY2025; down 18 since FY2023.
41	Inspiritec Inc. Top agencies DHRA (Defense Human Resources Activity) Army (Department of the Army)	$227,124,510	0.3%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
42	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	0.3%	Rank history: #77 in FY2021, #83 in FY2022, #61 in FY2023 and #33 in FY2025; up 19 since FY2023.
43	HUI Huliau Technology Services LLC Top agencies Army (Department of the Army) Navy (Department of the Navy)	$216,689,177	0.3%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
44	Mvm, Inc. Top agencies DHS (Department of Homeland Security)	$214,389,050	0.3%	Rank history: #52 in FY2021, #26 in FY2022, #37 in FY2023 and #46 in FY2025; down 7 since FY2023.
45	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: #34 in FY2021, #34 in FY2022, #38 in FY2023 and #59 in FY2025; down 7 since FY2023.
46	EA Engineering Science and Technology Inc. PBC Top agencies EPA (Environmental Protection Agency) Army (Department of the Army) Navy (Department of the Navy)	$206,268,931	0.3%	Rank history: not on the FY2021–FY2023 lists and #63 in FY2025; new.
47	Skookum Educational Programs Top agencies Army (Department of the Army) Navy (Department of the Navy) DHS (Department of Homeland Security)	$203,687,179	0.3%	Rank history: #43 in FY2021, #36 in FY2022, #41 in FY2023 and #37 in FY2025; down 6 since FY2023.
48	Amentum Technology, Inc. Top agencies Navy (Department of the Navy) Army (Department of the Army) NASA (National Aeronautics and Space Administration)	$191,565,647	0.3%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
49	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 #82 in FY2025; new.
50	Corecivic, Inc. Top agencies DHS (Department of Homeland Security) DOJ (Department of Justice)	$186,304,954	0.3%	Rank history: #32 in FY2021, #29 in FY2022, #43 in FY2023 and #27 in FY2025; down 7 since FY2023.
51	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, #65 in FY2023 and #45 in FY2025; up 14 since FY2023.
52	Hydrogeologic, Inc. Top agencies EPA (Environmental Protection Agency) Army (Department of the Army) Navy (Department of the Navy)	$175,949,681	0.2%	Rank history: #44 in FY2021, #57 in FY2022, #45 in FY2023 and #54 in FY2025; down 7 since FY2023.
53	Savannah River Nuclear Solutions LLC Top agencies DOE (Department of Energy)	$175,500,785	0.2%	Rank history: #8 in FY2021, #7 in FY2022, #6 in FY2023 and not on the FY2025 list; down 47 since FY2023.
54	Guidehouse Inc. Through Aptim Federal Services, LLC Top agencies DLA (Defense Logistics Agency) EPA (Environmental Protection Agency) DOE (Department of Energy)	$173,198,445	0.2%	Rank history: not on the FY2021–FY2023 lists and #50 in FY2025; new.
55	Professional Contract Services, Inc. Top agencies Army (Department of the Army) Navy (Department of the Navy) DHA (Defense Health Agency)	$170,639,034	0.2%	Rank history: #53 in FY2021, #48 in FY2022, #50 in FY2023 and #41 in FY2025; down 5 since FY2023.
56	Covenant Aviation Security LLC Top agencies DHS (Department of Homeland Security) VA (Department of Veterans Affairs)	$156,021,127	0.2%	Rank history: #56 in FY2021, #54 in FY2022, #55 in FY2023 and not on the FY2025 list; down 1 since FY2023.
57	Teamstaff Inc. Through DLH Solutions Inc. Top agencies VA (Department of Veterans Affairs)	$151,526,592	0.2%	Rank history: #95 in FY2021, #78 in FY2022, #53 in FY2023 and #73 in FY2025; down 4 since FY2023.
58	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, #76 in FY2023 and #40 in FY2025; up 18 since FY2023.
59	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 #62 in FY2025; new.
60	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 #44 in FY2025; new.
61	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 #43 in FY2025; new.
62	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 #29 in FY2025; new.
63	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: #66 in FY2021, #56 in FY2022, #62 in FY2023 and #52 in FY2025; down 1 since FY2023.
64	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 #42 in FY2025; new.
65	Paragon Professional Services LLC Top agencies DHS (Department of Homeland Security) DOE (Department of Energy) EPA (Environmental Protection Agency)	$120,966,366	0.2%	Rank history: not on the FY2021–FY2022 lists, #63 in FY2023 and #51 in FY2025; down 2 since FY2023.
66	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: #54 in FY2021, #51 in FY2022, #58 in FY2023 and #58 in FY2025; down 8 since FY2023.
67	Hanford Laboratory Management and Integration LLC Top agencies DOE (Department of Energy)	$120,000,839	0.2%	Rank history: not on the FY2021 list, #74 in FY2022, #77 in FY2023 and #67 in FY2025; up 10 since FY2023.
68	Energy Technology Alliance LLC Top agencies DOE (Department of Energy)	$117,718,826	0.2%	Rank history: not on the FY2021–FY2023 lists and #77 in FY2025; new.
69	Kemron Environmental Services Inc. 3 awardees, including Kemron / Arrowhead JV, LLC and Vrhabilis-Kemron JV, LLC Top agencies EPA (Environmental Protection Agency) Army (Department of the Army) Navy (Department of the Navy)	$115,216,372	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
70	AECOM Technical Services, Inc. Top agencies EPA (Environmental Protection Agency) Navy (Department of the Navy) Army (Department of the Army)	$111,999,527	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
71	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–FY2023 lists and #60 in FY2025; up 43 since FY2023.
72	Tetra Tech, Inc. 14 awardees, including Tetra TECH EC, Inc., Ard, Inc. and Pro-Telligent, LLC Top agencies DOS (Department of State) Army (Department of the Army) USAID (US Agency for International Development)	$109,229,125	0.2%	Rank history: #78 in FY2021, #55 in FY2022, #47 in FY2023 and #68 in FY2025; down 25 since FY2023.
73	Loyalty Support Services Top agencies Army (Department of the Army) DOD (Department of Defense)	$108,679,345	0.2%	Rank history: #65 in FY2021, #64 in FY2022, #68 in FY2023 and #36 in FY2025; down 5 since FY2023.
74	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)	$108,093,063	0.2%	Rank history: not on the FY2021–FY2023 lists and #71 in FY2025; new.
75	RSI Entech, LLC Top agencies DOE (Department of Energy)	$106,859,649	0.1%	Rank history: #86 in FY2021, #58 in FY2022, #71 in FY2023 and not on the FY2025 list; down 4 since FY2023.
76	Nana Regional Corporation Inc. 5 awardees, including Akima Intra-Data, LLC, Akima Range Readiness Operations LLC and Akima Logistics Services LLC Top agencies USAF (Department of the Air Force) Army (Department of the Army) AOUSC (Administrative Office of the U.S. Courts)	$103,638,690	0.1%	Rank history: not on the FY2021–FY2023 lists and #32 in FY2025; new.
77	Deployed Services, LLC Top agencies HHS (Department of Health and Human Services)	$103,636,072	0.1%	Rank history: not on the FY2021–FY2022 lists, #57 in FY2023 and not on the FY2025 list; down 20 since FY2023.
78	Serco Inc Top agencies Navy (Department of the Navy) DLA (Defense Logistics Agency)	$101,282,461	0.1%	Rank history: not on the FY2021–FY2023 lists and #69 in FY2025; up 83 since FY2023.
79	Cotton Commercial Usa, Inc. Top agencies DHS (Department of Homeland Security)	$100,831,503	0.1%	Rank history: #26 in FY2021, not on the FY2022–FY2023 lists and #70 in FY2025; returned.
80	Dawson Solutions LLC Top agencies Army (Department of the Army) DHS (Department of Homeland Security) EPA (Environmental Protection Agency)	$100,695,361	0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; up 217 since FY2023.
81	Idaho Environmental Coalition LLC Top agencies DOE (Department of Energy)	$99,813,459	0.1%	Rank history: not on the FY2021–FY2023 lists and #80 in FY2025; new.
82	Identity Theft Guard Solutions, Inc. Top agencies OPM (Office of Personnel Management) DHS (Department of Homeland Security) GAO (Government Accountability Office)	$99,687,213	0.1%	Rank history: #90 in FY2021, #62 in FY2022, not on the FY2023 list and not on the FY2025 list; up 74 since FY2023.
83	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	0.1%	Rank history: not on the FY2021 list, #43 in FY2022, #39 in FY2023 and not on the FY2025 list; down 44 since FY2023.
84	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)	$91,723,158	0.1%	Rank history: not on the FY2021 list, #86 in FY2022, #78 in FY2023 and not on the FY2025 list; down 6 since FY2023.
85	Jacobs Government Services Company 9 awardees, including Amentum Technology, Inc., Ch2M Hill Bwxt West Valley, LLC and Jacobs Engineering Group Inc. Top agencies NASA (National Aeronautics and Space Administration) DOE (Department of Energy) EPA (Environmental Protection Agency)	$91,272,203	0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
86	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: #70 in FY2021, #66 in FY2022, #87 in FY2023 and #78 in FY2025; up 1 since FY2023.
87	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 #61 in FY2025; new.
88	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 not on the FY2025 list; up 161 since FY2023.
89	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: #82 in FY2021, #93 in FY2022, #70 in FY2023 and not on the FY2025 list; down 19 since FY2023.
90	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: #59 in FY2021, #46 in FY2022, #54 in FY2023 and not on the FY2025 list; down 36 since FY2023.
91	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: #48 in FY2021, #45 in FY2022, #48 in FY2023 and not on the FY2025 list; down 43 since FY2023.
92	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: not on the FY2021 list, #71 in FY2022, #86 in FY2023 and #81 in FY2025; down 6 since FY2023.
93	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.
94	North Wind Portage, Inc. Top agencies Army (Department of the Army) DOE (Department of Energy)	$83,235,513	0.1%	Rank history: not on the FY2021–FY2023 lists and #72 in FY2025; new.
95	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, #92 in FY2023 and #79 in FY2025; down 3 since FY2023.
96	ITC Federal, LLC Top agencies DHS (Department of Homeland Security)	$81,729,932	0.1%	Rank history: not on the FY2021–FY2022 lists, #72 in FY2023 and not on the FY2025 list; down 24 since FY2023.
97	Vendtech-Sgi LLC Top agencies DHS (Department of Homeland Security)	$81,394,718	0.1%	Rank history: #85 in FY2021, #94 in FY2022, #88 in FY2023 and #86 in FY2025; down 9 since FY2023.
98	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: #81 in FY2021, #68 in FY2022, #93 in FY2023 and #95 in FY2025; down 5 since FY2023.
99	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 #87 in FY2025; new.
100	Navarro Research and Engineering, Inc. Top agencies DOE (Department of Energy) Army (Department of the Army)	$74,385,257	0.1%	Rank history: #73 in FY2021, #98 in FY2022, #97 in FY2023 and #98 in FY2025; down 3 since FY2023.

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100 of 11,700 contractors listed here. See the rest on GovTribe.

Rankings for the codes under NAICS 56

Code	Net obligations	Largest contractor
561 Administrative and Support Services	$56,225,163,439	Honeywell International Inc.
562 Waste Management and Remediation Services	$10,462,975,206	Amentum Services, 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 $71.9 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 56 contractors in FY2024?

1. Honeywell International Inc. ($6.09B), 2. Triad National Security LLC ($5.16B), 3. Consolidated Nuclear Security, LLC ($3.65B), 4. Fluor Corporation ($2.86B), 5. Ut-Battelle LLC ($2.55B), 6. Amentum Services, Inc. ($2.26B), 7. V2X, Inc. ($1.82B), 8. KBR Wyle Services LLC ($1.54B), 9. Mission Support & Test Services LLC ($1.11B), 10. Parsons Corporation ($1.06B).

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