Top 100 Department of Energy Contractors, Jul 2025–Jun 2026

Name: Top 100 Department of Energy Contractors, Jul 2025–Jun 2026
Creator: GovTribe
License: https://creativecommons.org/licenses/by/4.0/

Parent companies by net contract obligations Jul 1, 2025 – Jun 30, 2026 Agency page on GovTribe

The top 10 won 63% of Department of Energy contract dollars from July 2025 through June 2026

Contract obligations: $50,549,257,783 Net of deobligations, by the Department of Energy and its offices
Contractors: 1,068 Parent companies with an obligation
Largest contractor: Triad National Security LLC $5.13 billion, 9.9% of obligations
Data as of: Oct 23, 2026

Contract actions from FPDS (SAM.gov). How the rankings work · Download all 100 rows as CSV · Free to reuse with credit to GovTribe (CC BY 4.0)

Full ranking

Rank	Contractor	Net obligations	Share	Trend
1	Triad National Security LLC 2 awardees Top NAICS codes 561210 Facilities Support Services	$5,131,210,618	9.9%	Rank history: #2 in FY2021, #3 in FY2022, #2 in FY2023, #1 in FY2024 and #2 in FY2025; up 1 since Jul 2024–Jun 2025.
2	Fluor Corporation 4 awardees, including Savannah River Nuclear Solutions LLC, Fluor Marine Propulsion, LLC and Fluor-Bwxt Portsmouth LLC Top NAICS codes 561210 Facilities Support Services 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology) 562910 Remediation Services	$5,110,511,399	9.8%	Rank history: #5 in FY2021, #7 in FY2022, #5 in FY2023, #3 in FY2024 and #3 in FY2025; up 1 since Jul 2024–Jun 2025.
3	Honeywell International Inc. 3 awardees, including National Technology & Engineering Solutions of Sandia, LLC, Honeywell Federal Manufacturing & Technologies, LLC and Vindicator Technologies, Inc. Top NAICS codes 561210 Facilities Support Services 334290 Other Communications Equipment Manufacturing	$4,523,477,706	8.7%	Rank history: #1 in FY2021, #1 in FY2022, #1 in FY2023, #2 in FY2024 and #1 in FY2025; down 2 since Jul 2024–Jun 2025.
4	Battelle Memorial Institute 2 awardees, including Battelle Energy Alliance, LLC Top NAICS codes 541990 All Other Professional, Scientific, and Technical Services	$3,946,482,170	7.6%	Rank history: #3 in FY2021, #4 in FY2022, #9 in FY2023, #6 in FY2024 and #4 in FY2025; unchanged since Jul 2024–Jun 2025.
5	Lawrence Livermore National Security, LLC	$3,334,124,566	6.4%	Rank history: #6 in FY2021, #5 in FY2022, #7 in FY2023, #5 in FY2024 and #5 in FY2025; unchanged since Jul 2024–Jun 2025.
6	Ut-Battelle LLC Top NAICS codes 561210 Facilities Support Services	$3,090,480,030	6.0%	Rank history: #7 in FY2021, #6 in FY2022, #4 in FY2023, #7 in FY2024 and #6 in FY2025; unchanged since Jul 2024–Jun 2025.
7	Consolidated Nuclear Security, LLC Top NAICS codes 561210 Facilities Support Services	$2,916,296,479	5.6%	Rank history: #4 in FY2021, #2 in FY2022, #3 in FY2023, #4 in FY2024 and #7 in FY2025; unchanged since Jul 2024–Jun 2025.
8	Amentum Holdings, Inc. 10 awardees, including United Cleanup Oak Ridge LLC, Idaho Environmental Coalition LLC and Central Plateau Cleanup Company, LLC Top NAICS codes 562910 Remediation Services	$1,915,259,995	3.7%	Rank history: not on the FY2021–FY2023 lists, #27 in FY2024 and #10 in FY2025; up 2 since Jul 2024–Jun 2025.
9	Pantexas Deterrence, LLC Top NAICS codes 561210 Facilities Support Services	$1,702,506,862	3.3%	Rank history: not on the FY2021–FY2023 lists, #96 in FY2024 and #8 in FY2025; down 1 since Jul 2024–Jun 2025.
10	The Regents of the University of California Top NAICS codes 611310 Colleges, Universities, and Professional Schools	$1,264,651,924	2.4%	Rank history: not on the FY2021–FY2023 lists, #9 in FY2024 and #11 in FY2025; up 1 since Jul 2024–Jun 2025.
11	Savannah River Mission Completion, LLC Top NAICS codes 562910 Remediation Services	$1,168,123,719	2.3%	Rank history: not on the FY2021 list, #16 in FY2022, #14 in FY2023, #13 in FY2024 and #13 in FY2025; up 3 since Jul 2024–Jun 2025.
12	Bechtel Corp Through Bechtel National, Inc.	$1,150,580,152	2.2%	Rank history: #14 in FY2021, #19 in FY2022, #19 in FY2023, #14 in FY2024 and #14 in FY2025; up 4 since Jul 2024–Jun 2025.
13	Grimes Aerospace Company Through Honeywell Federal Manufacturing & Technologies, LLC Top NAICS codes 561210 Facilities Support Services	$1,025,805,256	2.0%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
14	Fermi Forward Discovery Group, LLC Top NAICS codes 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology)	$1,024,124,489	2.0%	Rank history: not on the FY2021–FY2024 lists and #9 in FY2025; down 5 since Jul 2024–Jun 2025.
15	Uchicago Argonne LLC 2 awardees	$997,310,022	1.9%	Rank history: not on the FY2021–FY2023 lists, #12 in FY2024 and #12 in FY2025; down 3 since Jul 2024–Jun 2025.
16	Brookhaven Science Associates LLC Top NAICS codes 541712 Research and Development in the Physical, Engineering, and Life Sciences (except Biotechnology)	$965,977,578	1.9%	Rank history: #15 in FY2021, #12 in FY2022, #15 in FY2023, #16 in FY2024 and #17 in FY2025; up 1 since Jul 2024–Jun 2025.
17	Mission Support & Test Services LLC Top NAICS codes 561210 Facilities Support Services	$911,836,815	1.8%	Rank history: #12 in FY2021, #13 in FY2022, #16 in FY2023, #10 in FY2024 and #15 in FY2025; down 2 since Jul 2024–Jun 2025.
18	American Centrifuge Operating, LLC Top NAICS codes 325180 Other Basic Inorganic Chemical Manufacturing 221113 Nuclear Electric Power Generation	$901,556,985	1.7%	Rank history: not on the FY2021–FY2023 lists, #43 in FY2024 and #25 in FY2025; up 6 since Jul 2024–Jun 2025.
19	General Matter, Inc. Top NAICS codes 325180 Other Basic Inorganic Chemical Manufacturing	$900,000,000	1.7%	Rank history: not on the FY2021–FY2025 lists; up 422 since Jul 2024–Jun 2025.
20	Orano Federal Services LLC Top NAICS codes 325180 Other Basic Inorganic Chemical Manufacturing	$899,843,485	1.7%	Rank history: not on the FY2021–FY2025 lists; up 420 since Jul 2024–Jun 2025.
21	Hanford Tank Waste Operations & Closure, LLC Top NAICS codes 562211 Hazardous Waste Treatment and Disposal	$841,002,959	1.6%	Rank history: not on the FY2021–FY2024 lists and #18 in FY2025; down 2 since Jul 2024–Jun 2025.
22	The Leland Stanford Junior University 2 awardees	$710,621,440	1.4%	Rank history: #17 in FY2021, #15 in FY2022, #18 in FY2023, #17 in FY2024 and #19 in FY2025; down 4 since Jul 2024–Jun 2025.
23	Alliance for Energy Innovation, LLC Top NAICS codes 541711 Research and Development in Biotechnology	$608,485,740	1.2%	Rank history: #16 in FY2021, #14 in FY2022, #12 in FY2023, #11 in FY2024 and #16 in FY2025; down 10 since Jul 2024–Jun 2025.
24	Strategic Storage Partners, Llc. Top NAICS codes 561210 Facilities Support Services	$424,026,021	0.8%	Rank history: not on the FY2021–FY2025 lists; up 418 since Jul 2024–Jun 2025.
25	Accenture Federal Services LLC Top NAICS codes 541512 Computer Systems Design Services	$380,608,591	0.7%	Rank history: not on the FY2021–FY2023 lists, #21 in FY2024 and #20 in FY2025; down 5 since Jul 2024–Jun 2025.
26	Suratech LLC Top NAICS codes 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology)	$289,988,170	0.6%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
27	Battelle Savannah River Alliance, LLC Top NAICS codes 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology)	$278,394,676	0.5%	Rank history: #22 in FY2021, not on the FY2022–FY2023 lists, #25 in FY2024 and #21 in FY2025; down 6 since Jul 2024–Jun 2025.
28	The Trustees of Princeton University Top NAICS codes 611310 Colleges, Universities, and Professional Schools	$209,969,210	0.4%	Rank history: #24 in FY2021, #23 in FY2022, #23 in FY2023, #31 in FY2024 and #22 in FY2025; down 2 since Jul 2024–Jun 2025.
29	Leidos Holdings, Inc. 5 awardees, including Leidos, Inc. and Hanford Mission Integration Solutions, LLC Top NAICS codes 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology) 561210 Facilities Support Services	$180,690,110	0.3%	Rank history: #20 in FY2021, #27 in FY2022, #24 in FY2023, #30 in FY2024 and #24 in FY2025; down 1 since Jul 2024–Jun 2025.
30	BWX Technologies, Inc. 4 awardees, including Bwxt Enrichment Operations, LLC, Nuclear Fuel Services Inc. and Bwxt Nuclear Operations Group, Inc. Top NAICS codes 541330 Engineering Services 325180 Other Basic Inorganic Chemical Manufacturing 562211 Hazardous Waste Treatment and Disposal	$177,717,992	0.3%	Rank history: not on the FY2021 list, #58 in FY2022, #28 in FY2023, #38 in FY2024 and #28 in FY2025; up 7 since Jul 2024–Jun 2025.
31	Arctic Slope Regional Corporation 5 awardees, including RSI Entech, LLC, Asrc Federal Technology Solutions, LLC and Agile Decision Sciences, LLC Top NAICS codes 562910 Remediation Services 541519 Other Computer Related Services 541512 Computer Systems Design Services	$145,008,125	0.3%	Rank history: #42 in FY2021, not on the FY2022–FY2024 lists and #29 in FY2025; new, not ranked in Jul 2024–Jun 2025.
32	Southern Ohio Cleanup Company LLC Top NAICS codes 562910 Remediation Services	$143,819,066	0.3%	Rank history: not on the FY2021–FY2024 lists and #64 in FY2025; up 136 since Jul 2024–Jun 2025.
33	Oak Ridge Associated Universities, Incorporated Top NAICS codes 541990 All Other Professional, Scientific, and Technical Services	$132,280,344	0.3%	Rank history: #19 in FY2021, #20 in FY2022, #21 in FY2023, #24 in FY2024 and #26 in FY2025; down 11 since Jul 2024–Jun 2025.
34	L3Harris Technologies, Inc. 4 awardees, including Bwxt Ordnance Tennessee, Inc. Top NAICS codes 325180 Other Basic Inorganic Chemical Manufacturing 928110 National Security 811210 Electronic and Precision Equipment Repair and Maintenance	$131,021,415	0.3%	Rank history: not on the FY2021–FY2024 lists and #47 in FY2025; up 279 since Jul 2024–Jun 2025.
35	Hanford Laboratory Management and Integration LLC Top NAICS codes 562910 Remediation Services	$106,922,566	0.2%	Rank history: #47 in FY2021, #31 in FY2022, #31 in FY2023, #33 in FY2024 and #34 in FY2025; down 6 since Jul 2024–Jun 2025.
36	West Valley Cleanup Alliance, LLC Top NAICS codes 562910 Remediation Services	$104,567,286	0.2%	Rank history: not on the FY2021–FY2024 lists and #50 in FY2025; up 122 since Jul 2024–Jun 2025.
37	Mele Associates Inc. Top NAICS codes 541330 Engineering Services	$100,242,619	0.2%	Rank history: #48 in FY2021, #36 in FY2022, #34 in FY2023, #37 in FY2024 and #32 in FY2025; down 3 since Jul 2024–Jun 2025.
38	Ciri Development Corporation 5 awardees, including North Wind Portage, Inc., Lbyd Federal, LLC and North Wind General Contractors LLC Top NAICS codes 562910 Remediation Services 561110 Office Administrative Services 236220 Commercial and Institutional Building Construction	$82,346,498	0.2%	Rank history: not on the FY2021–FY2022 lists, #54 in FY2023, not on the FY2024 list and #35 in FY2025; new, not ranked in Jul 2024–Jun 2025.
39	Energy Technology Alliance LLC Top NAICS codes 562910 Remediation Services	$78,984,913	0.2%	Rank history: not on the FY2021–FY2023 lists, #34 in FY2024 and #36 in FY2025; down 7 since Jul 2024–Jun 2025.
40	Navarro Research and Engineering, Inc. Top NAICS codes 562910 Remediation Services	$78,728,153	0.2%	Rank history: #32 in FY2021, #37 in FY2022, #37 in FY2023, #41 in FY2024 and #39 in FY2025; down 4 since Jul 2024–Jun 2025.
41	Atkins Nuclear Secured Holdings Corporation Through Isotek Systems, LLC Top NAICS codes 561990 All Other Support Services	$68,378,923	0.1%	Rank history: not on the FY2021–FY2023 lists, #45 in FY2024 and #40 in FY2025; down 2 since Jul 2024–Jun 2025.
42	General Atomics Top NAICS codes 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology)	$64,231,807	0.1%	Rank history: not on the FY2021–FY2023 lists, #68 in FY2024 and #49 in FY2025; up 18 since Jul 2024–Jun 2025.
43	CMA Technology Inc. Top NAICS codes 541519 Other Computer Related Services	$64,162,366	0.1%	Rank history: not on the FY2021–FY2024 lists and #56 in FY2025; new, not ranked in Jul 2024–Jun 2025.
44	Guidehouse Inc. 3 awardees, including Aptim Federal Services, LLC and Aptim-North Wind Construction JV LLC Top NAICS codes 562910 Remediation Services 237110 Water and Sewer Line and Related Structures Construction 541611 Administrative Management and General Management Consulting Services	$60,375,851	0.1%	Rank history: not on the FY2021–FY2023 lists, #47 in FY2024 and #30 in FY2025; up 3 since Jul 2024–Jun 2025.
45	Salas O'brien, Inc. Through Techsource, LLC Top NAICS codes 541330 Engineering Services	$59,934,501	0.1%	Rank history: not on the FY2021–FY2024 lists and #45 in FY2025; new, not ranked in Jul 2024–Jun 2025.
46	Minburn Technology Group, LLC Top NAICS codes 541519 Other Computer Related Services	$59,050,034	0.1%	Rank history: not on the FY2021–FY2023 lists, #52 in FY2024 and #44 in FY2025; down 6 since Jul 2024–Jun 2025.
47	Parsons Corporation 2 awardees, including Parsons Government Services Inc. and Parsons Government Services International Inc. Top NAICS codes 541330 Engineering Services 541990 All Other Professional, Scientific, and Technical Services	$51,168,441	0.1%	Rank history: #26 in FY2021, #43 in FY2022, #48 in FY2023, #39 in FY2024 and #43 in FY2025; down 9 since Jul 2024–Jun 2025.
48	Thundercat Technology LLC Top NAICS codes 541519 Other Computer Related Services	$49,087,253	0.1%	Rank history: not on the FY2021–FY2022 lists, #63 in FY2023, #61 in FY2024 and #55 in FY2025; up 2 since Jul 2024–Jun 2025.
49	The Aerospace Corporation Top NAICS codes 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology)	$48,249,125	0.1%	Rank history: #66 in FY2021, #53 in FY2022, #59 in FY2023, #59 in FY2024 and #52 in FY2025; up 10 since Jul 2024–Jun 2025.
50	Constellis, LLC Through Centerra Group, LLC Top NAICS codes 561612 Security Guards and Patrol Services	$46,713,287	0.1%	Rank history: not on the FY2021–FY2024 lists and #58 in FY2025; new, not ranked in Jul 2024–Jun 2025.
51	Booz Allen Hamilton Holding Corporation Through Booz Allen Hamilton Inc. Top NAICS codes 541990 All Other Professional, Scientific, and Technical Services 541511 Custom Computer Programming Services 561990 All Other Support Services	$46,403,456	0.1%	Rank history: #50 in FY2021, #45 in FY2022, #40 in FY2023, #42 in FY2024 and #42 in FY2025; down 7 since Jul 2024–Jun 2025.
52	Deloitte 3 awardees, including Deloitte Consulting LLP and Deloitte & Touche LLP Top NAICS codes 541611 Administrative Management and General Management Consulting Services 541519 Other Computer Related Services 541512 Computer Systems Design Services	$41,331,803	0.1%	Rank history: not on the FY2021–FY2024 lists and #84 in FY2025; up 46 since Jul 2024–Jun 2025.
53	Waseyabek Federal Services, L.L.C. Top NAICS codes 561210 Facilities Support Services	$38,685,368	0.1%	Rank history: not on the FY2021–FY2025 lists; up 384 since Jul 2024–Jun 2025.
54	Gap Solutions, Inc. Through Keylogic, LLC Top NAICS codes 541330 Engineering Services	$37,954,153	0.1%	Rank history: not on the FY2021–FY2024 lists and #48 in FY2025; new, not ranked in Jul 2024–Jun 2025.
55	Trafigura Trading LLC Top NAICS codes 424720 Petroleum and Petroleum Products Merchant Wholesalers (except Bulk Stations and Terminals)	$36,981,906	0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
56	Iowa State University of Science and Technology	$36,947,318	0.1%	Rank history: #34 in FY2021, #33 in FY2022, #27 in FY2023, #40 in FY2024 and #31 in FY2025; down 25 since Jul 2024–Jun 2025.
57	KBC Energy Solutions LLC Top NAICS codes 541330 Engineering Services	$36,116,820	0.1%	Rank history: not on the FY2021–FY2022 lists, #47 in FY2023, #46 in FY2024 and #59 in FY2025; down 2 since Jul 2024–Jun 2025.
58	Maximus Federal Services, Inc. Top NAICS codes 541512 Computer Systems Design Services 561422 Telemarketing Bureaus and Other Contact Centers	$35,378,052	0.1%	Rank history: not on the FY2021–FY2024 lists and #67 in FY2025; up 37 since Jul 2024–Jun 2025.
59	Anduril Industries Inc. Top NAICS codes 334511 Search, Detection, Navigation, Guidance, Aeronautical, and Nautical System and Instrument Manufacturing	$34,277,920	0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
60	Ukpeagvik Inupiat Corporation 2 awardees, including Qayaq Government Solutions LLC and Northbank Civil and Marine, LLC Top NAICS codes 236220 Commercial and Institutional Building Construction 237990 Other Heavy and Civil Engineering Construction	$34,265,704	0.1%	Rank history: not on the FY2021–FY2024 lists and #54 in FY2025; new, not ranked in Jul 2024–Jun 2025.
61	Project Enhancement Corporation Top NAICS codes 541620 Environmental Consulting Services	$32,512,467	0.1%	Rank history: #49 in FY2021, #47 in FY2022, #44 in FY2023, #48 in FY2024 and #46 in FY2025; down 18 since Jul 2024–Jun 2025.
62	Edgewater Federal Solutions, Inc. Top NAICS codes 541611 Administrative Management and General Management Consulting Services 518210 Computing Infrastructure Providers, Data Processing, Web Hosting, and Related Services 541330 Engineering Services	$29,655,516	0.1%	Rank history: #68 in FY2021, #60 in FY2022, #66 in FY2023, #74 in FY2024 and #71 in FY2025; up 12 since Jul 2024–Jun 2025.
63	Unwin Co Top NAICS codes 541690 Other Scientific and Technical Consulting Services	$29,341,481	0.1%	Rank history: #51 in FY2021, #48 in FY2022, #49 in FY2023, #54 in FY2024 and #57 in FY2025; down 12 since Jul 2024–Jun 2025.
64	Koniag, Inc. 6 awardees, including Kadiak LLC, Tuknik Government Services LLC and Koniag It Systems, LLC Top NAICS codes 541618 Other Management Consulting Services 541519 Other Computer Related Services 541990 All Other Professional, Scientific, and Technical Services	$29,065,702	0.1%	Rank history: #82 in FY2021, #81 in FY2022, #70 in FY2023, not on the FY2024 list and #63 in FY2025; up 13 since Jul 2024–Jun 2025.
65	Global Engineering & Technology Inc Top NAICS codes 541611 Administrative Management and General Management Consulting Services 541690 Other Scientific and Technical Consulting Services	$28,416,316	0.1%	Rank history: not on the FY2021–FY2024 lists and #91 in FY2025; up 50 since Jul 2024–Jun 2025.
66	Carahsoft Technology Corp Top NAICS codes 541519 Other Computer Related Services 511210 Software Publishers 513210 Software Publishers	$27,125,749	0.1%	Rank history: #58 in FY2021, #32 in FY2022, not on the FY2023 list, #57 in FY2024 and #65 in FY2025; up 14 since Jul 2024–Jun 2025.
67	Tetra Tech, Inc. 5 awardees, including Bluewater Federal Solutions, Inc., Tetra TECH EC, Inc. and Amyx Inc. Top NAICS codes 541330 Engineering Services 541620 Environmental Consulting Services 562910 Remediation Services	$26,880,030	0.1%	Rank history: #88 in FY2021, #78 in FY2022, #93 in FY2023, #81 in FY2024 and #66 in FY2025; down 4 since Jul 2024–Jun 2025.
68	Cherokee Nation 3 awardees, including Criterion Systems, L.L.C., Cherokee Nation Strategic Programs, L.L.C. and Cherokee Nation Defense Solutions LLC Top NAICS codes 541519 Other Computer Related Services 541330 Engineering Services 541990 All Other Professional, Scientific, and Technical Services	$25,494,155	<0.1%	Rank history: not on the FY2021–FY2024 lists and #38 in FY2025; new, not ranked in Jul 2024–Jun 2025.
69	Toshiba Corporation Through Westinghouse Government Services LLC Top NAICS codes 334517 Irradiation Apparatus Manufacturing	$25,230,672	<0.1%	Rank history: not on the FY2021–FY2024 lists and #62 in FY2025; new, not ranked in Jul 2024–Jun 2025.
70	Technomics Inc. Top NAICS codes 541330 Engineering Services	$23,917,192	<0.1%	Rank history: #73 in FY2021, #99 in FY2022, #97 in FY2023, #79 in FY2024 and #72 in FY2025; up 1 since Jul 2024–Jun 2025.
71	Cogent Security Consulting LLC 2 awardees, including Innovative Technology Partnerships LLC Top NAICS codes 561210 Facilities Support Services 541611 Administrative Management and General Management Consulting Services	$23,289,599	<0.1%	Rank history: not on the FY2021–FY2024 lists and #51 in FY2025; up 396 since Jul 2024–Jun 2025.
72	The Building People LLC Top NAICS codes 561210 Facilities Support Services 541611 Administrative Management and General Management Consulting Services	$22,522,144	<0.1%	Rank history: not on the FY2021–FY2022 lists, #58 in FY2023, #56 in FY2024 and #75 in FY2025; down 8 since Jul 2024–Jun 2025.
73	Powder River Industries, LLC Top NAICS codes 541519 Other Computer Related Services	$22,509,616	<0.1%	Rank history: not on the FY2021–FY2025 lists; up 44 since Jul 2024–Jun 2025.
74	The Chenega Corporation 7 awardees, including Chenega Enterprise Systems & Solutions, LLC, Chenega Professional & Technical Services LLC and Chenega Architecture and Design Solutions, LLC Top NAICS codes 541330 Engineering Services 236220 Commercial and Institutional Building Construction 621999 All Other Miscellaneous Ambulatory Health Care Services	$22,139,456	<0.1%	Rank history: not on the FY2021–FY2024 lists and #79 in FY2025; new, not ranked in Jul 2024–Jun 2025.
75	Deck Prism LLC Top NAICS codes 541690 Other Scientific and Technical Consulting Services 541611 Administrative Management and General Management Consulting Services	$20,948,957	<0.1%	Rank history: not on the FY2021–FY2025 lists; up 131 since Jul 2024–Jun 2025.
76	Eagle Harbor, LLC Top NAICS codes 611519 Other Technical and Trade Schools	$19,641,956	<0.1%	Rank history: not on the FY2021–FY2024 lists and #60 in FY2025; up 17 since Jul 2024–Jun 2025.
77	Energy Transfer Crude Marketing LLC Top NAICS codes 424720 Petroleum and Petroleum Products Merchant Wholesalers (except Bulk Stations and Terminals)	$18,533,691	<0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
78	Seatech Global Security Solutions Top NAICS codes 541990 All Other Professional, Scientific, and Technical Services	$18,416,024	<0.1%	Rank history: not on the FY2021–FY2024 lists and #81 in FY2025; up 45 since Jul 2024–Jun 2025.
79	Kpmg LLP Top NAICS codes 541211 Offices of Certified Public Accountants	$17,731,409	<0.1%	Rank history: not on the FY2021–FY2023 lists, #93 in FY2024 and #78 in FY2025; down 4 since Jul 2024–Jun 2025.
80	Allegheny Science & Technology Corporation Top NAICS codes 541330 Engineering Services	$17,721,811	<0.1%	Rank history: #78 in FY2021, #83 in FY2022, #76 in FY2023, #80 in FY2024 and #74 in FY2025; down 14 since Jul 2024–Jun 2025.
81	Sigma Science Inc Through RSI Nuclear, LLC Top NAICS codes 541330 Engineering Services	$16,734,847	<0.1%	Rank history: not on the FY2021–FY2022 lists, #81 in FY2023, #76 in FY2024 and #77 in FY2025; down 19 since Jul 2024–Jun 2025.
82	Nana Regional Corporation, Inc. 5 awardees, including Affigent, LLC, TKC Global Solutions, LLC and Akima Facilities Operations LLC Top NAICS codes 541519 Other Computer Related Services 541690 Other Scientific and Technical Consulting Services 561210 Facilities Support Services	$16,587,207	<0.1%	Rank history: not on the FY2021–FY2025 lists; up 59 since Jul 2024–Jun 2025.
83	Amazon Web Services, Inc. Top NAICS codes 518210 Computing Infrastructure Providers, Data Processing, Web Hosting, and Related Services	$16,378,056	<0.1%	Rank history: not on the FY2021–FY2025 lists; up 210 since Jul 2024–Jun 2025.
84	V3Gate, LLC Top NAICS codes 541519 Other Computer Related Services 423430 Computer and Computer Peripheral Equipment and Software Merchant Wholesalers	$16,307,996	<0.1%	Rank history: not on the FY2021–FY2024 lists and #100 in FY2025; up 19 since Jul 2024–Jun 2025.
85	General Dynamics Corporation 3 awardees, including General Dynamics Information Technology, Inc. Top NAICS codes 541519 Other Computer Related Services	$15,955,232	<0.1%	Rank history: not on the FY2021 list, #66 in FY2022, #75 in FY2023, #65 in FY2024 and #80 in FY2025; down 17 since Jul 2024–Jun 2025.
86	Mid-America Conversion Services, LLC Top NAICS codes 325180 Other Basic Inorganic Chemical Manufacturing	$15,513,178	<0.1%	Rank history: #27 in FY2021, #28 in FY2022, #25 in FY2023, #32 in FY2024 and #33 in FY2025; down 56 since Jul 2024–Jun 2025.
87	Epsilon Inc Top NAICS codes 541512 Computer Systems Design Services	$14,800,494	<0.1%	Rank history: not on the FY2021–FY2022 lists, #90 in FY2023, #88 in FY2024 and #83 in FY2025; down 3 since Jul 2024–Jun 2025.
88	CADRE5 LLC Top NAICS codes 541511 Custom Computer Programming Services	$14,782,191	<0.1%	Rank history: not on the FY2021–FY2024 lists and #87 in FY2025; up 40 since Jul 2024–Jun 2025.
89	Ivory Cloud LLC Top NAICS codes 541511 Custom Computer Programming Services	$13,985,797	<0.1%	Rank history: not on the FY2021–FY2024 lists and #92 in FY2025; up 19 since Jul 2024–Jun 2025.
90	Emcor Group Inc. Through Emcor Government Services, Inc. Top NAICS codes 561210 Facilities Support Services	$13,288,584	<0.1%	Rank history: not on the FY2021–FY2023 lists, #89 in FY2024 and #88 in FY2025; down 5 since Jul 2024–Jun 2025.
91	Vector Resource Inc Top NAICS codes 541611 Administrative Management and General Management Consulting Services	$13,010,063	<0.1%	Rank history: not on the FY2021–FY2025 lists; up 5 since Jul 2024–Jun 2025.
92	Colonial Metals Inc Top NAICS codes 332999 All Other Miscellaneous Fabricated Metal Product Manufacturing	$13,000,000	<0.1%	Rank history: not on the FY2021–FY2025 lists; up 19 since Jul 2024–Jun 2025.
93	Hunatek System Solutions LLC Top NAICS codes 541990 All Other Professional, Scientific, and Technical Services	$12,882,562	<0.1%	Rank history: not on the FY2021–FY2024 lists and #86 in FY2025; up 133 since Jul 2024–Jun 2025.
94	Procentrix, LLC Top NAICS codes 541519 Other Computer Related Services	$12,675,776	<0.1%	Rank history: not on the FY2021–FY2022 lists, #92 in FY2023, #85 in FY2024 and #93 in FY2025; down 2 since Jul 2024–Jun 2025.
95	Amvet Technologies LLC Top NAICS codes 541519 Other Computer Related Services	$12,586,097	<0.1%	Rank history: not on the FY2021–FY2024 lists and #97 in FY2025; up 6 since Jul 2024–Jun 2025.
96	Catawba Teapec LLC Top NAICS codes 562910 Remediation Services	$12,434,977	<0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
97	S & K Logistics Services LLC Top NAICS codes 561210 Facilities Support Services 541330 Engineering Services	$11,613,252	<0.1%	Rank history: not on the FY2021–FY2024 lists and #99 in FY2025; new, not ranked in Jul 2024–Jun 2025.
98	Simmons & Golden Security LLC Top NAICS codes 561612 Security Guards and Patrol Services	$10,995,161	<0.1%	Rank history: not on the FY2021–FY2024 lists and #98 in FY2025; up 1 since Jul 2024–Jun 2025.
99	Street Legal Industries LLC Top NAICS codes 541611 Administrative Management and General Management Consulting Services 561210 Facilities Support Services 561110 Office Administrative Services	$10,732,930	<0.1%	Rank history: not on the FY2021–FY2023 lists, #92 in FY2024 and #82 in FY2025; down 9 since Jul 2024–Jun 2025.
100	Cast Specialty Transportation Inc. Top NAICS codes 484230 Specialized Freight (except Used Goods) Trucking, Long-Distance	$10,689,368	<0.1%	Rank history: not on the FY2021 list, #98 in FY2022, not on the FY2023 list, #98 in FY2024 and not on the FY2025 list; up 22 since Jul 2024–Jun 2025.

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100 of 1,068 contractors listed here. See the rest on GovTribe.

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 $51.9 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. An awardee whose own actions mostly name no parent, and that no other company's actions name as their parent, rolls up its SAM.gov registration's chain of parent companies: it counts under the first company there that other companies' actions name as their parent, or under the parent most of a company's own actions name, whichever comes first; with neither, under the highest company in the chain with federal contracts of its own. Joint ventures stay companies of their own. 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.
Period: the trailing 12 months end with the last month that ended at least 90 days ago, because the Department of Defense reports its contract actions to FPDS about 90 days late. The list is rebuilt each night.
Rank changes compare with Jul 2024–Jun 2025. "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.
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 Department of Energy contractors in Jul 2025–Jun 2026?

1. Triad National Security LLC ($5.13B), 2. Fluor Corporation ($5.11B), 3. Honeywell International Inc. ($4.52B), 4. Battelle Memorial Institute ($3.95B), 5. Lawrence Livermore National Security, LLC ($3.33B), 6. Ut-Battelle LLC ($3.09B), 7. Consolidated Nuclear Security, LLC ($2.92B), 8. Amentum Holdings, Inc. ($1.92B), 9. Pantexas Deterrence, LLC ($1.7B), 10. The Regents of the University of California ($1.26B).

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