Top 100 Contractors in NAICS 56121: Facilities Support Services, FY2025

Name: Top 100 Contractors in NAICS 56121: Facilities 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 70% of FY2025 NAICS 56121 contract dollars

Contract obligations: $38,456,980,411 Net of deobligations, by contracts coded NAICS 56121 or a code under it
Contractors: 1,663 Parent companies with an obligation
Largest contractor: Honeywell International Inc. $7.8 billion, 19.1% 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. 5 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)	$7,795,462,428	19.1%	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	12.5%	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	6.6%	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	6.2%	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	5.8%	Rank history: #11 in FY2021, #10 in FY2022, #15 in FY2023 and #5 in FY2024; unchanged since FY2024.
6	V2X, Inc. 3 awardees, including V2X Systems LLC and Vectrus Federal Services GMBH Top agencies Army (Department of the Army) USAF (Department of the Air Force) Navy (Department of the Navy)	$2,050,366,398	5.0%	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	4.7%	Rank history: not on the FY2021–FY2024 lists; up 170 since FY2024.
8	Amentum Holdings, Inc. 18 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)	$1,802,678,111	4.4%	Rank history: not on the FY2021–FY2023 lists and #20 in FY2024; up 12 since FY2024.
9	KBR Wyle Services LLC 3 awardees, including KBR Services, LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force) Navy (Department of the Navy)	$1,197,387,578	2.9%	Rank history: not on the FY2021–FY2023 lists and #7 in FY2024; down 2 since FY2024.
10	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	2.4%	Rank history: #9 in FY2021, #9 in FY2022, #9 in FY2023 and #9 in FY2024; down 1 since FY2024.
11	Parsons Corporation Through Xator LLC Top agencies DOS (Department of State)	$543,813,312	1.3%	Rank history: not on the FY2021–FY2023 lists and #10 in FY2024; down 1 since FY2024.
12	The GEO Group, Inc. 3 awardees, including B.i. Incorporated and GEO Secure Services, LLC Top agencies DHS (Department of Homeland Security) DOJ (Department of Justice)	$504,504,191	1.2%	Rank history: #10 in FY2021, #11 in FY2022, #13 in FY2023 and #12 in FY2024; unchanged since FY2024.
13	Arctic Slope Regional Corporation 10 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)	$381,944,233	0.9%	Rank history: #18 in FY2021, #19 in FY2022, #19 in FY2023 and #21 in FY2024; up 8 since FY2024.
14	Leidos Holdings, Inc. 6 awardees, including Leidos, Inc. and Hanford Mission Integration Solutions, LLC Top agencies NSF (National Science Foundation) DOE (Department of Energy) Army (Department of the Army)	$368,681,248	0.9%	Rank history: #15 in FY2021, #16 in FY2022, #17 in FY2023 and #17 in FY2024; up 3 since FY2024.
15	Loyalty Support Services Top agencies Army (Department of the Army)	$220,683,196	0.5%	Rank history: #35 in FY2021, #31 in FY2022, #34 in FY2023 and #31 in FY2024; up 16 since FY2024.
16	General Dynamics Corporation 6 awardees, including General Dynamics OTS (Wilkes Barre), LLC, General Dynamics Land Systems Inc. and General Dynamics Mission Systems, Inc. Top agencies Army (Department of the Army) Navy (Department of the Navy)	$207,637,918	0.5%	Rank history: #49 in FY2021, #18 in FY2022, #8 in FY2023 and #15 in FY2024; down 1 since FY2024.
17	Nana Regional Corporation, Inc. 8 awardees, including Akima Intra-Data, LLC, Akima Range Readiness Operations LLC and Akima Global Logistics, LLC Top agencies USAF (Department of the Air Force) Army (Department of the Army) NASA (National Aeronautics and Space Administration)	$205,225,355	0.5%	Rank history: not on the FY2021–FY2023 lists and #35 in FY2024; up 18 since FY2024.
18	ECC International, LLC Top agencies USAF (Department of the Air Force)	$200,052,508	0.5%	Rank history: not on the FY2021–FY2024 lists; up 474 since FY2024.
19	Akima Facilities Operations LLC Top agencies Army (Department of the Army) HHS (Department of Health and Human Services) Navy (Department of the Navy)	$192,893,086	0.5%	Rank history: not on the FY2021 list, #43 in FY2022, #41 in FY2023 and #25 in FY2024; up 6 since FY2024.
20	Professional Contract Services, Inc. Top agencies Army (Department of the Army) Navy (Department of the Navy) DHS (Department of Homeland Security)	$144,065,248	0.4%	Rank history: #38 in FY2021, #34 in FY2022, #36 in FY2023 and #27 in FY2024; up 7 since FY2024.
21	Skookum Educational Programs Top agencies Army (Department of the Army) Navy (Department of the Navy) DOE (Department of Energy)	$141,163,302	0.3%	Rank history: #28 in FY2021, #28 in FY2022, #26 in FY2023 and #26 in FY2024; up 5 since FY2024.
22	Sallyport Global Holdings Inc. Top agencies USAF (Department of the Air Force)	$134,741,521	0.3%	Rank history: not on the FY2021–FY2024 lists; up 118 since FY2024.
23	Nova Space Solutions, LLC Top agencies NASA (National Aeronautics and Space Administration)	$129,847,904	0.3%	Rank history: not on the FY2021–FY2024 lists; new.
24	J & J Maintenance Inc. Top agencies Army (Department of the Army) DECA (Defense Commissary Agency) Navy (Department of the Navy)	$128,319,668	0.3%	Rank history: #26 in FY2021, #22 in FY2022, #25 in FY2023 and #28 in FY2024; up 4 since FY2024.
25	Cotton Commercial Usa, Inc. Top agencies DHS (Department of Homeland Security)	$101,351,626	0.2%	Rank history: #17 in FY2021, not on the FY2022–FY2023 lists and #34 in FY2024; up 9 since FY2024.
26	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 #32 in FY2024; up 6 since FY2024.
27	Teamstaff Inc. Through DLH Solutions Inc. Top agencies VA (Department of Veterans Affairs)	$93,853,975	0.2%	Rank history: not on the FY2021–FY2022 lists, #56 in FY2023 and #30 in FY2024; up 3 since FY2024.
28	Emcor Group Inc. 3 awardees, including Emcor Government Services, Inc. and Mesa Energy Systems, Inc. Top agencies GSA (General Services Administration) NARA (National Archives and Records Administration) DOE (Department of Energy)	$85,413,897	0.2%	Rank history: not on the FY2021–FY2022 lists, #45 in FY2023 and #39 in FY2024; up 11 since FY2024.
29	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	0.2%	Rank history: not on the FY2021–FY2023 lists and #22 in FY2024; down 7 since FY2024.
30	Action Facilities Management Inc. Top agencies GSA (General Services Administration) DOJ (Department of Justice) Army (Department of the Army)	$79,246,148	0.2%	Rank history: #71 in FY2021, #62 in FY2022, #47 in FY2023 and #45 in FY2024; up 15 since FY2024.
31	Pegasus Support Services LLC Top agencies Army (Department of the Army) GSA (General Services Administration) DHS (Department of Homeland Security)	$76,792,548	0.2%	Rank history: not on the FY2021–FY2023 lists and #41 in FY2024; up 10 since FY2024.
32	Chugach Logistics and Facility Services JV, LLC Top agencies USAF (Department of the Air Force) Navy (Department of the Navy)	$76,048,253	0.2%	Rank history: not on the FY2021–FY2023 lists and #68 in FY2024; up 36 since FY2024.
33	T&H Services, LLC Top agencies Army (Department of the Army) DOS (Department of State) Navy (Department of the Navy)	$73,755,175	0.2%	Rank history: not on the FY2021–FY2024 lists; up 85 since FY2024.
34	Pride Industries Top agencies USAF (Department of the Air Force) Treasury (Department of the Treasury) Army (Department of the Army)	$73,285,846	0.2%	Rank history: #22 in FY2021, #21 in FY2022, #21 in FY2023 and #24 in FY2024; down 10 since FY2024.
35	Inussuk A / S Top agencies USAF (Department of the Air Force) DHA (Defense Health Agency) Navy (Department of the Navy)	$71,577,757	0.2%	Rank history: not on the FY2021–FY2024 lists; up 73 since FY2024.
36	Kgjj Engineering Solutions, LLC Top agencies Army (Department of the Army) Navy (Department of the Navy)	$71,478,742	0.2%	Rank history: not on the FY2021–FY2022 lists, #94 in FY2023 and #83 in FY2024; up 47 since FY2024.
37	CGI Federal Inc. Top agencies DOJ (Department of Justice)	$71,244,665	0.2%	Rank history: not on the FY2021–FY2024 lists; up 152 since FY2024.
38	Koa Lani JV LLC Top agencies Navy (Department of the Navy)	$71,078,627	0.2%	Rank history: #56 in FY2021, #36 in FY2022, #42 in FY2023 and #47 in FY2024; up 9 since FY2024.
39	Tiya Services L.L.C. Top agencies Army (Department of the Army)	$70,551,971	0.2%	Rank history: not on the FY2021–FY2023 lists and #44 in FY2024; up 5 since FY2024.
40	Brillient Corporation Top agencies DHS (Department of Homeland Security)	$69,658,268	0.2%	Rank history: #40 in FY2021, not on the FY2022 list, #44 in FY2023 and #49 in FY2024; up 9 since FY2024.
41	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	0.2%	Rank history: not on the FY2021–FY2022 lists, #64 in FY2023 and #58 in FY2024; up 17 since FY2024.
42	Pond Constructors Inc. Top agencies DLA (Defense Logistics Agency)	$62,987,632	0.2%	Rank history: not on the FY2021 list, #84 in FY2022, #49 in FY2023 and #43 in FY2024; up 1 since FY2024.
43	Nelson Refrigeration Inc. Top agencies DECA (Defense Commissary Agency)	$62,873,207	0.2%	Rank history: not on the FY2021–FY2023 lists and #69 in FY2024; up 26 since FY2024.
44	Red River Science & Technology, LLC Top agencies Army (Department of the Army)	$58,625,098	0.1%	Rank history: not on the FY2021–FY2022 lists, #79 in FY2023 and #84 in FY2024; up 40 since FY2024.
45	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: #63 in FY2021, #57 in FY2022, #60 in FY2023 and #62 in FY2024; up 17 since FY2024.
46	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–FY2022 lists, #57 in FY2023 and #56 in FY2024; up 10 since FY2024.
47	The Building People LLC Top agencies DOE (Department of Energy) GSA (General Services Administration) DOI (Department of the Interior)	$55,635,471	0.1%	Rank history: not on the FY2021–FY2022 lists, #59 in FY2023 and #51 in FY2024; up 4 since FY2024.
48	Readiness Management Support LC Top agencies USAF (Department of the Air Force)	$55,415,859	0.1%	Rank history: not on the FY2021 list, #91 in FY2022, not on the FY2023 list and #65 in FY2024; up 17 since FY2024.
49	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 67 since FY2024.
50	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–FY2022 lists, #77 in FY2023 and #61 in FY2024; up 11 since FY2024.
51	Tunista Logistics Solutions LLC Top agencies USAF (Department of the Air Force) Army (Department of the Army) Navy (Department of the Navy)	$52,469,884	0.1%	Rank history: not on the FY2021–FY2023 lists and #81 in FY2024; up 30 since FY2024.
52	Tatitlek Corporation Through Tatitlek Technologies, LLC Top agencies DOS (Department of State)	$51,901,957	0.1%	Rank history: not on the FY2021–FY2022 lists, #69 in FY2023 and #60 in FY2024; up 8 since FY2024.
53	KBR Diego Garcia, LLC Top agencies Navy (Department of the Navy) USAF (Department of the Air Force)	$51,486,879	0.1%	Rank history: #39 in FY2021, #50 in FY2022, #52 in FY2023 and #54 in FY2024; up 1 since FY2024.
54	King & George, LLC Top agencies Army (Department of the Army) GSA (General Services Administration) DOT (Department of Transportation)	$50,261,888	0.1%	Rank history: #46 in FY2021, #38 in FY2022, #43 in FY2023 and #66 in FY2024; up 12 since FY2024.
55	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)	$48,612,396	0.1%	Rank history: #21 in FY2021, #27 in FY2022, #30 in FY2023 and #86 in FY2024; up 31 since FY2024.
56	K'oyitl'ots'ina, Limited 3 awardees, including Yukon Fire Protection Services, Inc., Kcorp Support Services, Inc. and Kcorp Technology Services, Inc. Top agencies GSA (General Services Administration) SSA (Social Security Administration) DHS (Department of Homeland Security)	$48,406,003	0.1%	Rank history: not on the FY2021–FY2024 lists; up 162 since FY2024.
57	Valiant Integrated Services LLC 2 awardees, including Valiant Government Services LLC and Valiant / Alca JV LLC Top agencies Army (Department of the Army) Navy (Department of the Navy)	$47,887,110	0.1%	Rank history: not on the FY2021 list, #67 in FY2022, #71 in FY2023 and #92 in FY2024; up 35 since FY2024.
58	Raven Services JV LLC 2 awardees, including Raven Services Corp Top agencies GSA (General Services Administration) NARA (National Archives and Records Administration) DOT (Department of Transportation)	$45,228,137	0.1%	Rank history: not on the FY2021–FY2024 lists; up 46 since FY2024.
59	Vanquish Worldwide L.L.C. Top agencies Army (Department of the Army)	$45,048,520	0.1%	Rank history: not on the FY2021–FY2024 lists; up 69 since FY2024.
60	Facility Services Management, Inc. Top agencies Army (Department of the Army) DHA (Defense Health Agency) NARA (National Archives and Records Administration)	$41,924,573	0.1%	Rank history: #45 in FY2021, #40 in FY2022, #35 in FY2023 and #36 in FY2024; down 24 since FY2024.
61	Phoenix Management Inc Top agencies USAF (Department of the Air Force) Army (Department of the Army) GSA (General Services Administration)	$39,976,609	0.1%	Rank history: not on the FY2021–FY2022 lists, #72 in FY2023 and #80 in FY2024; up 19 since FY2024.
62	Battelle Memorial Institute Top agencies NSF (National Science Foundation)	$39,937,125	0.1%	Rank history: #68 in FY2021, #51 in FY2022, #61 in FY2023 and #64 in FY2024; up 2 since FY2024.
63	J&J and Alms Mission Support Solutions, LLC Top agencies Navy (Department of the Navy) USAF (Department of the Air Force) DHA (Defense Health Agency)	$38,417,411	0.1%	Rank history: not on the FY2021–FY2024 lists; up 90 since FY2024.
64	Global Pacific Design Builders, LLC Top agencies Navy (Department of the Navy)	$38,311,584	0.1%	Rank history: not on the FY2021 list, #97 in FY2022, #51 in FY2023 and not on the FY2024 list; up 48 since FY2024.
65	R & D Maintenance Services Inc. Top agencies Army (Department of the Army)	$37,663,715	0.1%	Rank history: #87 in FY2021, #73 in FY2022 and not on the FY2023–FY2024 lists; up 50 since FY2024.
66	Chenega Base & Logistics Services LLC Top agencies Army (Department of the Army)	$36,139,025	0.1%	Rank history: not on the FY2021–FY2023 lists and #74 in FY2024; up 8 since FY2024.
67	Pacarctic, LLC Top agencies DOS (Department of State) GSA (General Services Administration) Commerce (Department of Commerce)	$35,836,409	0.1%	Rank history: not on the FY2021–FY2024 lists; up 50 since FY2024.
68	Centerra Integrated Facilities Services, LLC Top agencies Army (Department of the Army) GSA (General Services Administration) DHS (Department of Homeland Security)	$35,117,621	0.1%	Rank history: not on the FY2021–FY2024 lists; up 56 since FY2024.
69	Advanced C4 Solutions Inc. Top agencies DOS (Department of State)	$34,389,298	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
70	Jll-Midnight Sun Ifms LLC Top agencies Navy (Department of the Navy) DHA (Defense Health Agency) Army (Department of the Army)	$34,351,346	0.1%	Rank history: #75 in FY2021, #68 in FY2022, #87 in FY2023 and #90 in FY2024; up 20 since FY2024.
71	Siemens Industry Inc. Top agencies VA (Department of Veterans Affairs) HHS (Department of Health and Human Services) USAF (Department of the Air Force)	$34,344,520	0.1%	Rank history: not on the FY2021–FY2023 lists and #87 in FY2024; up 16 since FY2024.
72	Ho-Chunk, Inc. 3 awardees, including HCI Management Services Company, Dynamic-Hhs JV, LLC and All Native Synergies Company Top agencies DOS (Department of State) Army (Department of the Army) NASA (National Aeronautics and Space Administration)	$33,744,627	0.1%	Rank history: not on the FY2021–FY2024 lists; up 244 since FY2024.
73	Innovative Technology Partnerships LLC Top agencies DOE (Department of Energy)	$33,117,083	0.1%	Rank history: not on the FY2021–FY2024 lists; up 128 since FY2024.
74	Frontline King George JV LLC Top agencies Army (Department of the Army) Navy (Department of the Navy) USAF (Department of the Air Force)	$32,362,178	0.1%	Rank history: not on the FY2021–FY2024 lists; up 78 since FY2024.
75	Charles River Laboratories International Inc. Through Charles River Laboratories, Inc. Top agencies HHS (Department of Health and Human Services)	$32,012,766	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
76	Melwood Horticultural Training Center, Inc. Top agencies Army (Department of the Army) USDA (Department of Agriculture) DHS (Department of Homeland Security)	$31,698,074	0.1%	Rank history: not on the FY2021 list, #78 in FY2022, not on the FY2023 list and #97 in FY2024; up 21 since FY2024.
77	Weston Solutions Holdings, Inc. 2 awardees, including Weston Solutions, Inc. Top agencies DLA (Defense Logistics Agency) Army (Department of the Army)	$31,255,622	0.1%	Rank history: #93 in FY2021, #46 in FY2022, #40 in FY2023 and #46 in FY2024; down 31 since FY2024.
78	DAE Sung LLC Top agencies GSA (General Services Administration) HHS (Department of Health and Human Services) SSA (Social Security Administration)	$30,904,149	0.1%	Rank history: not on the FY2021–FY2022 lists, #97 in FY2023 and #88 in FY2024; up 10 since FY2024.
79	Gana-A' Yoo, Limited 3 awardees, including Six Mile Nika JV, LLC, Kaiyuh Services, LLC and Yukon Management, LLC Top agencies DHS (Department of Homeland Security) DOI (Department of the Interior) HUD (Department of Housing and Urban Development)	$30,811,824	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
80	Northern Management Services, Inc. Top agencies GSA (General Services Administration) DOJ (Department of Justice) DHS (Department of Homeland Security)	$30,709,117	0.1%	Rank history: not on the FY2021 list, #99 in FY2022, #96 in FY2023 and not on the FY2024 list; up 23 since FY2024.
81	Trax International Corporation Top agencies NASA (National Aeronautics and Space Administration)	$30,684,644	0.1%	Rank history: not on the FY2021–FY2024 lists; up 154 since FY2024.
82	Aleut O&M Services, LLC Top agencies Army (Department of the Army)	$30,202,072	0.1%	Rank history: not on the FY2021 list, #96 in FY2022, #92 in FY2023 and #79 in FY2024; down 3 since FY2024.
83	Defense Base Services, LLC Top agencies Navy (Department of the Navy)	$29,274,445	0.1%	Rank history: not on the FY2021–FY2024 lists; up 255 since FY2024.
84	Swift & Staley Inc. Top agencies DOE (Department of Energy)	$28,673,805	0.1%	Rank history: #70 in FY2021, #54 in FY2022, #74 in FY2023 and #71 in FY2024; down 13 since FY2024.
85	Criterion Corporation Top agencies USAF (Department of the Air Force)	$28,400,731	0.1%	Rank history: not on the FY2021–FY2024 lists; up 17 since FY2024.
86	Servicesource Inc. Top agencies WHS (DOD Washington Headquarters Service) DOT (Department of Transportation)	$28,332,240	0.1%	Rank history: #85 in FY2021, #66 in FY2022, not on the FY2023 list and #95 in FY2024; up 9 since FY2024.
87	Kira Training Services LLC Top agencies USAF (Department of the Air Force)	$28,155,208	0.1%	Rank history: not on the FY2021–FY2024 lists; up 321 since FY2024.
88	Ranger Defense, Incorporated Through Ranger Land Systems, Inc. Top agencies DHS (Department of Homeland Security)	$27,212,166	0.1%	Rank history: not on the FY2021–FY2023 lists and #59 in FY2024; down 29 since FY2024.
89	Fitt Scientific LLC Top agencies Army (Department of the Army)	$27,175,639	0.1%	Rank history: not on the FY2021–FY2024 lists; up 33 since FY2024.
90	Vectrus-J&J Facilities Support, LLC Top agencies Navy (Department of the Navy)	$26,856,580	0.1%	Rank history: not on the FY2021–FY2024 lists; up 224 since FY2024.
91	Enviremedial Services, Inc. Top agencies Army (Department of the Army)	$26,515,005	0.1%	Rank history: not on the FY2021–FY2024 lists; up 28 since FY2024.
92	M.c. Dean, Inc. Top agencies GSA (General Services Administration) USAF (Department of the Air Force) OSD (Office of the Secretary of Defense)	$25,871,886	0.1%	Rank history: not on the FY2021 list, #82 in FY2022, #99 in FY2023 and not on the FY2024 list; up 22 since FY2024.
93	Nve, Inc. Top agencies Treasury (Department of the Treasury) USDA (Department of Agriculture) HHS (Department of Health and Human Services)	$25,344,615	0.1%	Rank history: not on the FY2021–FY2022 lists, #93 in FY2023 and #77 in FY2024; down 16 since FY2024.
94	Tsay Professional Services, Inc. Top agencies Army (Department of the Army)	$25,313,721	0.1%	Rank history: #61 in FY2021, #53 in FY2022, #84 in FY2023 and not on the FY2024 list; up 13 since FY2024.
95	Alcyon Technical Services (ATS) JV LLC Top agencies NASA (National Aeronautics and Space Administration)	$24,951,195	0.1%	Rank history: not on the FY2021–FY2024 lists; up 134 since FY2024.
96	O & A Technical Services LLC Top agencies DOT (Department of Transportation)	$24,893,592	0.1%	Rank history: not on the FY2021–FY2024 lists; up 109 since FY2024.
97	Westech International, Inc. Top agencies Army (Department of the Army) Navy (Department of the Navy)	$24,714,824	0.1%	Rank history: not on the FY2021–FY2024 lists; up 63 since FY2024.
98	Chugach Alaska Corporation 3 awardees, including Chugach Consolidated Solutions, LLC and Wolf Creek Federal Services LLC Top agencies Army (Department of the Army) Navy (Department of the Navy)	$24,248,685	0.1%	Rank history: #25 in FY2021, #26 in FY2022, #23 in FY2023 and #42 in FY2024; down 56 since FY2024.
99	WE2 Support Services 8A JV LLC Top agencies DOE (Department of Energy)	$23,993,223	0.1%	Rank history: #62 in FY2021, #60 in FY2022, #55 in FY2023 and #67 in FY2024; down 32 since FY2024.
100	Elektro-Krueck-Gmbh, Elektroinstallationen Top agencies Army (Department of the Army)	$23,594,331	0.1%	Rank history: not on the FY2021–FY2024 lists; up 42 since FY2024.

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100 of 1,663 contractors listed here. See the rest on GovTribe.

Rankings for the codes under NAICS 56121

Code	Net obligations	Largest contractor
561210 Facilities Support Services	$38,456,980,411	Honeywell International 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 $40.7 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 56121 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. ($2.05B), 7. Pantexas Deterrence, LLC ($1.92B), 8. Amentum Holdings, Inc. ($1.8B), 9. KBR Wyle Services LLC ($1.2B), 10. Mission Support & Test Services LLC ($995M).

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