Top 100 Department of Energy Contractors, FY2023

Name: Top 100 Department of Energy Contractors, FY2023
Creator: GovTribe
License: https://creativecommons.org/licenses/by/4.0/

Parent companies by net contract obligations Oct 1, 2022 – Sep 30, 2023 Agency page on GovTribe

The top 10 won 67% of FY2023 Department of Energy contract dollars

Contract obligations: $41,859,255,098 Net of deobligations, by the Department of Energy and its offices
Contractors: 1,377 Parent companies with an obligation
Largest contractor: Honeywell International Inc. $4.71 billion, 11.0% of obligations
Data as of: Oct 14, 2026

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

Full ranking

Rank	Contractor	Net obligations	Share	Trend
1	Honeywell International Inc. 2 awardees, including National Technology & Engineering Solutions of Sandia, LLC and Honeywell Federal Manufacturing & Technologies, LLC Top NAICS codes 561210 Facilities Support Services	$4,705,741,717	11.0%	Rank history: #1 in FY2021, #1 in FY2022, #2 in FY2024 and #1 in FY2025; unchanged since FY2022.
2	Triad National Security LLC 2 awardees Top NAICS codes 561210 Facilities Support Services	$4,309,982,926	10.1%	Rank history: #2 in FY2021, #3 in FY2022, #1 in FY2024 and #2 in FY2025; up 1 since FY2022.
3	Consolidated Nuclear Security, LLC Top NAICS codes 561210 Facilities Support Services	$3,296,453,902	7.7%	Rank history: #4 in FY2021, #2 in FY2022, #4 in FY2024 and #7 in FY2025; down 1 since FY2022.
4	Ut-Battelle LLC Top NAICS codes 561210 Facilities Support Services	$2,712,833,486	6.3%	Rank history: #7 in FY2021, #6 in FY2022, #7 in FY2024 and #6 in FY2025; up 2 since FY2022.
5	Fluor Corporation 4 awardees, including Fluor Marine Propulsion, LLC, Fluor-Bwxt Portsmouth LLC and Fluor Federal Petroleum Operations, LLC Top NAICS codes 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology) 562910 Remediation Services 561210 Facilities Support Services	$2,581,032,466	6.0%	Rank history: #5 in FY2021, #7 in FY2022, #3 in FY2024 and #3 in FY2025; up 2 since FY2022.
6	Savannah River Nuclear Solutions LLC Top NAICS codes 561210 Facilities Support Services	$2,539,868,766	5.9%	Rank history: #8 in FY2021, #8 in FY2022, #28 in FY2024 and not on the FY2025 list; up 2 since FY2022.
7	Lawrence Livermore National Security, LLC	$2,523,317,785	5.9%	Rank history: #6 in FY2021, #5 in FY2022, #5 in FY2024 and #5 in FY2025; down 2 since FY2022.
8	Battelle Energy Alliance, LLC 2 awardees Top NAICS codes 541990 All Other Professional, Scientific, and Technical Services	$2,234,861,162	5.2%	Rank history: not on the FY2021 list, #24 in FY2022, #15 in FY2024 and not on the FY2025 list; up 16 since FY2022.
9	Battelle Memorial Institute 2 awardees, including Battelle Savannah River Alliance, LLC Top NAICS codes 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology)	$1,885,530,035	4.4%	Rank history: #3 in FY2021, #4 in FY2022, #6 in FY2024 and #4 in FY2025; down 5 since FY2022.
10	Government of the United States 5 awardees, including Uchicago Argonne, LLC and Fermi Research Alliance, LLC	$1,790,772,019	4.2%	Rank history: #9 in FY2021, #9 in FY2022, #23 in FY2024 and not on the FY2025 list; down 1 since FY2022.
11	State of California Controllers Office 2 awardees, including The Regents of the University of California Top NAICS codes 611310 Colleges, Universities, and Professional Schools	$1,327,019,879	3.1%	Rank history: #11 in FY2021, #11 in FY2022, #29 in FY2024 and not on the FY2025 list; unchanged since FY2022.
12	Alliance for Energy Innovation, LLC Top NAICS codes 541711 Research and Development in Biotechnology	$1,231,995,583	2.9%	Rank history: #16 in FY2021, #14 in FY2022, #11 in FY2024 and #16 in FY2025; up 2 since FY2022.
13	Amentum Services, Inc. 5 awardees, including Washington River Protection Solutions LLC and Central Plateau Cleanup Company, LLC Top NAICS codes 562211 Hazardous Waste Treatment and Disposal 562910 Remediation Services	$1,231,279,659	2.9%	Rank history: #10 in FY2021, #10 in FY2022, #8 in FY2024 and not on the FY2025 list; down 3 since FY2022.
14	Savannah River Mission Completion, LLC Top NAICS codes 562910 Remediation Services	$823,336,868	1.9%	Rank history: not on the FY2021 list, #16 in FY2022, #13 in FY2024 and #13 in FY2025; up 2 since FY2022.
15	Brookhaven Science Associates LLC Top NAICS codes 541712 Research and Development in the Physical, Engineering, and Life Sciences (except Biotechnology)	$789,434,033	1.8%	Rank history: #15 in FY2021, #12 in FY2022, #16 in FY2024 and #17 in FY2025; down 3 since FY2022.
16	Mission Support & Test Services LLC Top NAICS codes 561210 Facilities Support Services	$780,547,213	1.8%	Rank history: #12 in FY2021, #13 in FY2022, #10 in FY2024 and #15 in FY2025; down 3 since FY2022.
17	United Cleanup Oak Ridge LLC Top NAICS codes 562910 Remediation Services	$752,637,900	1.8%	Rank history: not on the FY2021–FY2022 lists, #18 in FY2024 and #27 in FY2025; new.
18	The Leland Stanford Junior University Top NAICS codes 541714 Research and Development in Biotechnology (except Nanobiotechnology) 611310 Colleges, Universities, and Professional Schools	$609,972,349	1.4%	Rank history: #17 in FY2021, #15 in FY2022, #17 in FY2024 and #19 in FY2025; down 3 since FY2022.
19	Bechtel Corp Through Bechtel National, Inc.	$579,277,600	1.4%	Rank history: #14 in FY2021, #19 in FY2022, #14 in FY2024 and #14 in FY2025; unchanged since FY2022.
20	Accenture Inc. Through Accenture Federal Services LLC Top NAICS codes 541512 Computer Systems Design Services 541519 Other Computer Related Services	$428,056,383	1.0%	Rank history: not on the FY2021 list, #22 in FY2022, #83 in FY2024 and not on the FY2025 list; up 2 since FY2022.
21	Oak Ridge Associated Universities, Incorporated Top NAICS codes 541990 All Other Professional, Scientific, and Technical Services	$351,326,581	0.8%	Rank history: #19 in FY2021, #20 in FY2022, #24 in FY2024 and #26 in FY2025; down 1 since FY2022.
22	Jefferson Science Associates, LLC	$219,952,512	0.5%	Rank history: #23 in FY2021, #21 in FY2022, #26 in FY2024 and #23 in FY2025; down 1 since FY2022.
23	The Trustees of Princeton University Top NAICS codes 611310 Colleges, Universities, and Professional Schools	$160,459,858	0.4%	Rank history: #24 in FY2021, #23 in FY2022, #31 in FY2024 and #22 in FY2025; unchanged since FY2022.
24	Leidos Holdings, Inc. 4 awardees, including Leidos, Inc. Top NAICS codes 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology) 541611 Administrative Management and General Management Consulting Services 518210 Computing Infrastructure Providers, Data Processing, Web Hosting, and Related Services	$139,946,524	0.3%	Rank history: #20 in FY2021, #27 in FY2022, #30 in FY2024 and #24 in FY2025; up 3 since FY2022.
25	Mid-America Conversion Services, LLC Top NAICS codes 325180 Other Basic Inorganic Chemical Manufacturing	$126,437,600	0.3%	Rank history: #27 in FY2021, #28 in FY2022, #32 in FY2024 and #33 in FY2025; up 3 since FY2022.
26	Triple Canopy Inc. Through Centerra Group, LLC Top NAICS codes 561612 Security Guards and Patrol Services	$108,328,346	0.3%	Rank history: #29 in FY2021, #26 in FY2022 and not on the FY2024–FY2025 lists; unchanged since FY2022.
27	Iowa State University of Science and Technology	$103,297,256	0.2%	Rank history: #34 in FY2021, #33 in FY2022, #40 in FY2024 and #31 in FY2025; up 6 since FY2022.
28	BWX Technologies, Inc. 5 awardees, including Nuclear Fuel Services Inc., Bwxt Nuclear Operations Group, Inc. and Bwxt Nog Technologies, Inc. Top NAICS codes 325180 Other Basic Inorganic Chemical Manufacturing 562211 Hazardous Waste Treatment and Disposal	$102,575,207	0.2%	Rank history: not on the FY2021 list, #58 in FY2022, #38 in FY2024 and #28 in FY2025; up 30 since FY2022.
29	RSI Entech, LLC Top NAICS codes 562910 Remediation Services	$93,269,485	0.2%	Rank history: #33 in FY2021, #29 in FY2022, #35 in FY2024 and not on the FY2025 list; unchanged since FY2022.
30	Ch2M Hill Bwxt West Valley, LLC Top NAICS codes 562910 Remediation Services	$87,558,755	0.2%	Rank history: #30 in FY2021, #30 in FY2022, #64 in FY2024 and not on the FY2025 list; unchanged since FY2022.
31	Hanford Laboratory Management and Integration LLC Top NAICS codes 562910 Remediation Services	$85,471,763	0.2%	Rank history: #47 in FY2021, #31 in FY2022, #33 in FY2024 and #34 in FY2025; unchanged since FY2022.
32	Jacobs Engineering Group Inc. 4 awardees, including Idaho Environmental Coalition LLC, Amentum Technology, Inc. and Blue Canopy Group, LLC Top NAICS codes 562910 Remediation Services 541330 Engineering Services 541512 Computer Systems Design Services	$77,755,917	0.2%	Rank history: #28 in FY2021, not on the FY2022 list, #22 in FY2024 and not on the FY2025 list; up 180 since FY2022.
33	Central Plateau Cleanup Company, LLC Top NAICS codes 562910 Remediation Services	$74,906,529	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
34	Mele Associates Inc. Top NAICS codes 541330 Engineering Services	$70,161,903	0.2%	Rank history: #48 in FY2021, #36 in FY2022, #37 in FY2024 and #32 in FY2025; up 2 since FY2022.
35	Aptim Federal Services LLC Top NAICS codes 562910 Remediation Services	$69,606,788	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
36	Information International Associates Inc. Through Keylogic, LLC Top NAICS codes 541330 Engineering Services	$56,731,297	0.1%	Rank history: #39 in FY2021, #40 in FY2022 and not on the FY2024–FY2025 lists; up 4 since FY2022.
37	Navarro Research and Engineering, Inc. 2 awardees Top NAICS codes 562910 Remediation Services	$54,908,308	0.1%	Rank history: #32 in FY2021, #37 in FY2022, #41 in FY2024 and #39 in FY2025; unchanged since FY2022.
38	Cook Inlet Region Inc. 4 awardees, including North Wind Portage, Inc. and OSC Technical Solutions, LLC Top NAICS codes 562910 Remediation Services 541620 Environmental Consulting Services	$54,378,360	0.1%	Rank history: #25 in FY2021, #34 in FY2022, #60 in FY2024 and not on the FY2025 list; down 4 since FY2022.
39	Criterion Systems, L.L.C. Top NAICS codes 541513 Computer Facilities Management Services	$53,903,941	0.1%	Rank history: #31 in FY2021, #38 in FY2022, #63 in FY2024 and not on the FY2025 list; down 1 since FY2022.
40	Booz Allen Hamilton Holding Corporation Through Booz Allen Hamilton Inc. Top NAICS codes 561990 All Other Support Services 541511 Custom Computer Programming Services 541612 Human Resources Consulting Services	$51,425,162	0.1%	Rank history: #50 in FY2021, #45 in FY2022, #42 in FY2024 and #42 in FY2025; up 5 since FY2022.
41	WE2 Support Services 8A JV LLC Top NAICS codes 561210 Facilities Support Services	$50,626,426	0.1%	Rank history: #44 in FY2021, #46 in FY2022, #51 in FY2024 and #70 in FY2025; up 5 since FY2022.
42	Atkins Nuclear Secured Holdings Corporation Through Isotek Systems, LLC Top NAICS codes 561990 All Other Support Services	$50,508,521	0.1%	Rank history: #36 in FY2021, #35 in FY2022 and not on the FY2024–FY2025 lists; down 7 since FY2022.
43	Centrus Energy Corp. Through American Centrifuge Operating, LLC Top NAICS codes 221113 Nuclear Electric Power Generation 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology)	$50,024,107	0.1%	Rank history: #43 in FY2021, #62 in FY2022, #72 in FY2024 and not on the FY2025 list; up 19 since FY2022.
44	Project Enhancement Corporation Top NAICS codes 541620 Environmental Consulting Services	$49,662,621	0.1%	Rank history: #49 in FY2021, #47 in FY2022, #48 in FY2024 and #46 in FY2025; up 3 since FY2022.
45	Regan Technologies Corp Top NAICS codes 541519 Other Computer Related Services 444140 Hardware Retailers 511210 Software Publishers	$48,525,851	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
46	Apogee Group, LLC Top NAICS codes 237990 Other Heavy and Civil Engineering Construction	$48,049,108	0.1%	Rank history: #55 in FY2021, #63 in FY2022 and not on the FY2024–FY2025 lists; up 17 since FY2022.
47	KBC Energy Solutions LLC Top NAICS codes 541330 Engineering Services	$46,094,739	0.1%	Rank history: not on the FY2021–FY2022 lists, #46 in FY2024 and #59 in FY2025; new.
48	Parsons Corporation 2 awardees, including Parsons Government Services Inc. Top NAICS codes 541330 Engineering Services 541611 Administrative Management and General Management Consulting Services	$44,210,592	0.1%	Rank history: #26 in FY2021, #43 in FY2022, #39 in FY2024 and #43 in FY2025; down 5 since FY2022.
49	Unwin Co Top NAICS codes 541690 Other Scientific and Technical Consulting Services	$40,191,082	0.1%	Rank history: #51 in FY2021, #48 in FY2022, #54 in FY2024 and #57 in FY2025; down 1 since FY2022.
50	General Atomic Technologies Corporation Through General Atomics Top NAICS codes 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology)	$36,684,407	0.1%	Rank history: #53 in FY2021, #54 in FY2022 and not on the FY2024–FY2025 lists; up 4 since FY2022.
51	Swift & Staley Inc. Top NAICS codes 561210 Facilities Support Services	$36,113,490	0.1%	Rank history: #52 in FY2021, #41 in FY2022, #55 in FY2024 and #61 in FY2025; down 10 since FY2022.
52	Boston Government Services, LLC Top NAICS codes 541620 Environmental Consulting Services	$35,662,941	0.1%	Rank history: #46 in FY2021, #44 in FY2022 and not on the FY2024–FY2025 lists; down 8 since FY2022.
53	Guidehouse Inc. Top NAICS codes 541611 Administrative Management and General Management Consulting Services	$35,185,432	0.1%	Rank history: #75 in FY2021, #56 in FY2022 and not on the FY2024–FY2025 lists; up 3 since FY2022.
54	Ciri Development Corporation 4 awardees, including North Wind Construction Services, LLC, North Wind Site Services, LLC and North Wind Resource Consulting LLC Top NAICS codes 236220 Commercial and Institutional Building Construction 541620 Environmental Consulting Services 541611 Administrative Management and General Management Consulting Services	$34,933,898	0.1%	Rank history: not on the FY2021–FY2022 lists, not on the FY2024 list and #35 in FY2025; new.
55	Archetype II LLC Top NAICS codes 523930 Investment Advice	$34,517,063	0.1%	Rank history: not on the FY2021 list, #69 in FY2022, #62 in FY2024 and not on the FY2025 list; up 14 since FY2022.
56	Techsource, LLC Top NAICS codes 541330 Engineering Services	$32,797,849	0.1%	Rank history: #57 in FY2021, #57 in FY2022, #53 in FY2024 and not on the FY2025 list; up 1 since FY2022.
57	Regents of the University of California the (4458)	$32,232,444	0.1%	Rank history: #37 in FY2021, #79 in FY2022, #70 in FY2024 and #69 in FY2025; up 22 since FY2022.
58	The Building People LLC Top NAICS codes 561210 Facilities Support Services 541611 Administrative Management and General Management Consulting Services	$30,878,984	0.1%	Rank history: not on the FY2021–FY2022 lists, #56 in FY2024 and #75 in FY2025; up 139 since FY2022.
59	The Aerospace Corporation Top NAICS codes 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology)	$30,617,500	0.1%	Rank history: #66 in FY2021, #53 in FY2022, #59 in FY2024 and #52 in FY2025; down 6 since FY2022.
60	Enterprise Technical Assistance Services Inc. Top NAICS codes 562910 Remediation Services	$30,144,333	0.1%	Rank history: #61 in FY2021, #65 in FY2022, #66 in FY2024 and not on the FY2025 list; up 5 since FY2022.
61	The Day & Zimmermann Group, Inc. Through SOC LLC Top NAICS codes 561612 Security Guards and Patrol Services	$30,019,602	0.1%	Rank history: #40 in FY2021, #39 in FY2022 and not on the FY2024–FY2025 lists; down 22 since FY2022.
62	Aptim-North Wind Construction JV LLC Top NAICS codes 237110 Water and Sewer Line and Related Structures Construction	$29,356,803	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 54 since FY2022.
63	Thundercat Technology LLC 2 awardees Top NAICS codes 541519 Other Computer Related Services	$26,415,780	0.1%	Rank history: not on the FY2021–FY2022 lists, #61 in FY2024 and #55 in FY2025; up 72 since FY2022.
64	ICF International, Inc. Through ICF Incorporated, L.L.C. Top NAICS codes 541611 Administrative Management and General Management Consulting Services 541330 Engineering Services	$25,537,096	0.1%	Rank history: #79 in FY2021, #76 in FY2022 and not on the FY2024–FY2025 lists; up 12 since FY2022.
65	Maximus Inc. Through Maximus Federal Technology Solutions, LLC Top NAICS codes 541512 Computer Systems Design Services 541511 Custom Computer Programming Services	$25,531,025	0.1%	Rank history: not on the FY2021 list, #55 in FY2022 and not on the FY2024–FY2025 lists; down 10 since FY2022.
66	Edgewater Federal Solutions Inc. 2 awardees Top NAICS codes 541330 Engineering Services 541519 Other Computer Related Services 518210 Computing Infrastructure Providers, Data Processing, Web Hosting, and Related Services	$24,709,115	0.1%	Rank history: #68 in FY2021, #60 in FY2022, #74 in FY2024 and #71 in FY2025; down 6 since FY2022.
67	Kupono Government Services, LLC Top NAICS codes 611430 Professional and Management Development Training	$23,813,419	0.1%	Rank history: #60 in FY2021, #67 in FY2022, #73 in FY2024 and not on the FY2025 list; unchanged since FY2022.
68	Intepros Federal Incorporated Top NAICS codes 541511 Custom Computer Programming Services	$22,408,925	0.1%	Rank history: #67 in FY2021, #71 in FY2022 and not on the FY2024–FY2025 lists; up 3 since FY2022.
69	Four Rivers Nuclear Partnership LLC Top NAICS codes 562910 Remediation Services	$21,683,615	0.1%	Rank history: #97 in FY2021, #92 in FY2022 and not on the FY2024–FY2025 lists; up 23 since FY2022.
70	Koniag, Inc. 3 awardees, including Kadiak LLC, Tuknik Government Services LLC and Eagle Harbor Solutions LLC Top NAICS codes 541618 Other Management Consulting Services 541519 Other Computer Related Services 541611 Administrative Management and General Management Consulting Services	$21,590,124	0.1%	Rank history: #82 in FY2021, #81 in FY2022, not on the FY2024 list and #63 in FY2025; up 11 since FY2022.
71	Confederated Salish and Kootenai Tribes 3 awardees, including S & K Logistics Services LLC, S&K Mission Support, LLC and S & K Federal Services LLC Top NAICS codes 562910 Remediation Services 561210 Facilities Support Services 541330 Engineering Services	$21,264,892	<0.1%	Rank history: #72 in FY2021, #89 in FY2022 and not on the FY2024–FY2025 lists; up 18 since FY2022.
72	Tech2 Solutions Top NAICS codes 237990 Other Heavy and Civil Engineering Construction	$20,398,646	<0.1%	Rank history: #45 in FY2021, #64 in FY2022, #87 in FY2024 and not on the FY2025 list; down 8 since FY2022.
73	General Electric Company 4 awardees, including GE Renewables US LLC, GE Energy Management Services, LLC and GE Grid Solutions LLC Top NAICS codes 237990 Other Heavy and Civil Engineering Construction 511210 Software Publishers 513210 Software Publishers	$20,388,105	<0.1%	Rank history: not on the FY2021–FY2022 lists, #82 in FY2024 and not on the FY2025 list; up 70 since FY2022.
74	North Wind Construction Services, LLC Top NAICS codes 236220 Commercial and Institutional Building Construction	$20,258,040	<0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 50 since FY2022.
75	General Dynamics Corporation 4 awardees, including General Dynamics Information Technology, Inc., General Dynamics Mission Systems, Inc. and General Dynamics One Source LLC Top NAICS codes 541519 Other Computer Related Services 334290 Other Communications Equipment Manufacturing 334220 Radio and Television Broadcasting and Wireless Communications Equipment Manufacturing	$19,868,135	<0.1%	Rank history: not on the FY2021 list, #66 in FY2022, #65 in FY2024 and #80 in FY2025; down 9 since FY2022.
76	Allegheny Science & Technology Corporation Top NAICS codes 541330 Engineering Services	$19,808,633	<0.1%	Rank history: #78 in FY2021, #83 in FY2022, #80 in FY2024 and #74 in FY2025; up 7 since FY2022.
77	Kbr, Inc. Through Dependable Global Solutions, LLC Top NAICS codes 541690 Other Scientific and Technical Consulting Services	$19,754,129	<0.1%	Rank history: #90 in FY2021, not on the FY2022 list and not on the FY2024–FY2025 lists; up 33 since FY2022.
78	Palantir Technologies Inc. Top NAICS codes 511210 Software Publishers	$19,356,284	<0.1%	Rank history: not on the FY2021 list, #70 in FY2022, #75 in FY2024 and #73 in FY2025; down 8 since FY2022.
79	IMG - Crown Energy Services Joint Venture, LLC Top NAICS codes 518210 Computing Infrastructure Providers, Data Processing, Web Hosting, and Related Services	$19,315,782	<0.1%	Rank history: #63 in FY2021, not on the FY2022 list, not on the FY2024 list and #96 in FY2025; up 29 since FY2022.
80	Management Solutions LLC Top NAICS codes 541511 Custom Computer Programming Services 561210 Facilities Support Services 561110 Office Administrative Services	$19,149,573	<0.1%	Rank history: not on the FY2021–FY2022 lists, #71 in FY2024 and #41 in FY2025; up 295 since FY2022.
81	Sigma Science Inc Through RSI Nuclear, LLC Top NAICS codes 541330 Engineering Services 541690 Other Scientific and Technical Consulting Services	$18,612,746	<0.1%	Rank history: not on the FY2021–FY2022 lists, #76 in FY2024 and #77 in FY2025; new.
82	Energy Fuels Holdings Corp.	$18,470,000	<0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
83	Buckeye Terminals LLC Top NAICS codes 493190 Other Warehousing and Storage	$18,163,980	<0.1%	Rank history: #62 in FY2021, #61 in FY2022 and not on the FY2024–FY2025 lists; down 22 since FY2022.
84	Strata Energy, Inc.	$18,000,000	<0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
85	Uranium Energy Corp.	$17,850,000	<0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
86	Cohnreznick LLP Top NAICS codes 541211 Offices of Certified Public Accountants	$17,112,226	<0.1%	Rank history: not on the FY2021 list, #84 in FY2022 and not on the FY2024–FY2025 lists; down 2 since FY2022.
87	Analytic Services Inc. Through Advanced Technology International	$17,000,000	<0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 65 since FY2022.
88	Westinghouse Electric Company LLC Through Westinghouse Government Services LLC Top NAICS codes 334517 Irradiation Apparatus Manufacturing 493110 General Warehousing and Storage	$16,827,311	<0.1%	Rank history: #69 in FY2021, #68 in FY2022 and not on the FY2024–FY2025 lists; down 20 since FY2022.
89	Evoke Research and Consulting, LLC Top NAICS codes 541519 Other Computer Related Services	$16,285,328	<0.1%	Rank history: #76 in FY2021, #87 in FY2022 and not on the FY2024–FY2025 lists; down 2 since FY2022.
90	Epsilon Inc Top NAICS codes 541512 Computer Systems Design Services	$16,162,829	<0.1%	Rank history: not on the FY2021–FY2022 lists, #88 in FY2024 and #83 in FY2025; new.
91	Kpmg L.L.P. Top NAICS codes 541211 Offices of Certified Public Accountants	$15,752,592	<0.1%	Rank history: #89 in FY2021, #86 in FY2022 and not on the FY2024–FY2025 lists; down 5 since FY2022.
92	Procentrix, LLC Top NAICS codes 541519 Other Computer Related Services	$15,383,122	<0.1%	Rank history: not on the FY2021–FY2022 lists, #85 in FY2024 and #93 in FY2025; up 28 since FY2022.
93	Tetra Tech, Inc. 4 awardees, including Bluewater Federal Solutions, Inc. and Tetra TECH EC, Inc. Top NAICS codes 541330 Engineering Services 541620 Environmental Consulting Services 562910 Remediation Services	$15,214,249	<0.1%	Rank history: #88 in FY2021, #78 in FY2022, #81 in FY2024 and #66 in FY2025; down 15 since FY2022.
94	Colonial Metals, Inc. Top NAICS codes 332999 All Other Miscellaneous Fabricated Metal Product Manufacturing	$15,162,993	<0.1%	Rank history: #92 in FY2021, #75 in FY2022 and not on the FY2024–FY2025 lists; down 19 since FY2022.
95	East Coast Powerline LLC Top NAICS codes 237130 Power and Communication Line and Related Structures Construction	$15,063,374	<0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
96	Catawba-Tea, LLC Top NAICS codes 562910 Remediation Services	$14,921,737	<0.1%	Rank history: not on the FY2021–FY2022 lists, #99 in FY2024 and not on the FY2025 list; new.
97	Technomics Inc. Top NAICS codes 541330 Engineering Services	$14,570,312	<0.1%	Rank history: #73 in FY2021, #99 in FY2022, #79 in FY2024 and #72 in FY2025; up 2 since FY2022.
98	Converdyn,Gp	$14,504,452	<0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
99	Didlake Inc. Top NAICS codes 561720 Janitorial Services 561110 Office Administrative Services	$13,030,944	<0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 8 since FY2022.
100	Paragon Professional Services LLC Top NAICS codes 562910 Remediation Services	$13,008,658	<0.1%	Rank history: #95 in FY2021, not on the FY2022 list, #94 in FY2024 and not on the FY2025 list; up 13 since FY2022.

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100 of 1,377 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 $42.7 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 2023 ran Oct 1, 2022 – Sep 30, 2023. 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 FY2022. "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 FY2022 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 Department of Energy contractors in FY2023?

1. Honeywell International Inc. ($4.71B), 2. Triad National Security LLC ($4.31B), 3. Consolidated Nuclear Security, LLC ($3.3B), 4. Ut-Battelle LLC ($2.71B), 5. Fluor Corporation ($2.58B), 6. Savannah River Nuclear Solutions LLC ($2.54B), 7. Lawrence Livermore National Security, LLC ($2.52B), 8. Battelle Energy Alliance, LLC ($2.23B), 9. Battelle Memorial Institute ($1.89B), 10. Government of the United States ($1.79B).

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