Top 100 Department of Energy Contractors, FY2021

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	$5,982,084,944	15.5%	Rank history: #1 in FY2022, #1 in FY2023, #2 in FY2024 and #1 in FY2025; up 3 since FY2020.
2	Triad National Security, LLC Top NAICS codes 561210 Facilities Support Services	$3,955,926,494	10.3%	Rank history: #3 in FY2022, #2 in FY2023, #1 in FY2024 and #2 in FY2025; down 1 since FY2020.
3	Battelle Memorial Institute 3 awardees, including Battelle Energy Alliance, LLC and Battelle Savannah River Alliance, LLC Top NAICS codes 541990 All Other Professional, Scientific, and Technical Services 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology)	$2,640,424,286	6.8%	Rank history: #4 in FY2022, #9 in FY2023, #6 in FY2024 and #4 in FY2025; up 4 since FY2020.
4	Consolidated Nuclear Security, LLC Top NAICS codes 561210 Facilities Support Services	$2,607,717,690	6.8%	Rank history: #2 in FY2022, #3 in FY2023, #4 in FY2024 and #7 in FY2025; down 1 since FY2020.
5	Fluor Corporation 4 awardees, including Fluor Marine Propulsion, LLC, Fluor Idaho LLC and Fluor-Bwxt Portsmouth 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	$2,542,151,628	6.6%	Rank history: #7 in FY2022, #5 in FY2023, #3 in FY2024 and #3 in FY2025; up 14 since FY2020.
6	Lawrence Livermore National Security, LLC	$2,508,719,603	6.5%	Rank history: #5 in FY2022, #7 in FY2023, #5 in FY2024 and #5 in FY2025; unchanged since FY2020.
7	Ut-Battelle LLC Top NAICS codes 561210 Facilities Support Services	$2,266,992,542	5.9%	Rank history: #6 in FY2022, #4 in FY2023, #7 in FY2024 and #6 in FY2025; down 2 since FY2020.
8	Savannah River Nuclear Solutions LLC Top NAICS codes 561210 Facilities Support Services	$1,663,520,279	4.3%	Rank history: #8 in FY2022, #6 in FY2023, #28 in FY2024 and not on the FY2025 list; unchanged since FY2020.
9	Government of the United States 4 awardees, including Uchicago Argonne, LLC, Fermi Research Alliance, LLC and Federal Prison Industries, Inc. Top NAICS codes 221121 Electric Bulk Power Transmission and Control 337211 Wood Office Furniture Manufacturing	$1,608,025,473	4.2%	Rank history: #9 in FY2022, #10 in FY2023, #23 in FY2024 and not on the FY2025 list; up 1 since FY2020.
10	Amentum Services, Inc. 3 awardees, including Savannah River Remediation LLC, Central Plateau Cleanup Company, LLC and Washington River Protection Solutions LLC Top NAICS codes 562211 Hazardous Waste Treatment and Disposal 562910 Remediation Services	$1,548,586,541	4.0%	Rank history: #10 in FY2022, #13 in FY2023, #8 in FY2024 and not on the FY2025 list; up 98 since FY2020.
11	State of California Controllers Office 4 awardees, including The Regents of the University of California, California Department of Parks & Recreation and University of California Irvine Top NAICS codes 611310 Colleges, Universities, and Professional Schools 561210 Facilities Support Services 813920 Professional Organizations	$1,160,293,548	3.0%	Rank history: #11 in FY2022, #11 in FY2023, #29 in FY2024 and not on the FY2025 list; unchanged since FY2020.
12	Mission Support & Test Services LLC Top NAICS codes 561210 Facilities Support Services	$854,697,036	2.2%	Rank history: #13 in FY2022, #16 in FY2023, #10 in FY2024 and #15 in FY2025; up 3 since FY2020.
13	AECOM 6 awardees, including Ucor LLC, Nuclear Waste Partnership LLC and Washington River Protection Solutions LLC Top NAICS codes 562910 Remediation Services 561210 Facilities Support Services 562211 Hazardous Waste Treatment and Disposal	$838,207,024	2.2%	Rank history: #17 in FY2022 and not on the FY2023–FY2025 lists; unchanged since FY2020.
14	Bechtel Corp Through Bechtel National, Inc.	$821,408,315	2.1%	Rank history: #19 in FY2022, #19 in FY2023, #14 in FY2024 and #14 in FY2025; up 3 since FY2020.
15	Brookhaven Science Associates LLC Top NAICS codes 541712 Research and Development in the Physical, Engineering, and Life Sciences (except Biotechnology)	$667,585,945	1.7%	Rank history: #12 in FY2022, #15 in FY2023, #16 in FY2024 and #17 in FY2025; down 1 since FY2020.
16	Alliance for Energy Innovation, LLC Top NAICS codes 541711 Research and Development in Biotechnology	$554,678,334	1.4%	Rank history: #14 in FY2022, #12 in FY2023, #11 in FY2024 and #16 in FY2025; up 10 since FY2020.
17	The Leland Stanford Junior University Top NAICS codes 541714 Research and Development in Biotechnology (except Nanobiotechnology) 611310 Colleges, Universities, and Professional Schools	$510,875,924	1.3%	Rank history: #15 in FY2022, #18 in FY2023, #17 in FY2024 and #19 in FY2025; up 4 since FY2020.
18	Accenture Federal Services LLC 2 awardees, including ASM Research, LLC Top NAICS codes 541512 Computer Systems Design Services 541519 Other Computer Related Services	$299,799,869	0.8%	Rank history: #25 in FY2022 and not on the FY2023–FY2025 lists; up 9 since FY2020.
19	Oak Ridge Associated Universities, Incorporated Top NAICS codes 541990 All Other Professional, Scientific, and Technical Services	$271,023,397	0.7%	Rank history: #20 in FY2022, #21 in FY2023, #24 in FY2024 and #26 in FY2025; up 5 since FY2020.
20	Leidos Holdings, Inc. 4 awardees, including Leidos, Inc. and Mission Support Alliance, LLC Top NAICS codes 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology) 561210 Facilities Support Services 541611 Administrative Management and General Management Consulting Services	$220,598,332	0.6%	Rank history: #27 in FY2022, #24 in FY2023, #30 in FY2024 and #24 in FY2025; up 10 since FY2020.
21	Washington River Protection Solutions LLC Top NAICS codes 562211 Hazardous Waste Treatment and Disposal	$194,600,000	0.5%	Rank history: not on the FY2022–FY2025 lists; down 5 since FY2020.
22	Battelle Savannah River Alliance, LLC Top NAICS codes 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology)	$171,618,297	0.4%	Rank history: not on the FY2022–FY2023 lists, #25 in FY2024 and #21 in FY2025; new, not ranked in FY2020.
23	Jefferson Science Associates, LLC	$148,900,365	0.4%	Rank history: #21 in FY2022, #22 in FY2023, #26 in FY2024 and #23 in FY2025; up 9 since FY2020.
24	The Trustees of Princeton University Top NAICS codes 611310 Colleges, Universities, and Professional Schools	$142,158,682	0.4%	Rank history: #23 in FY2022, #23 in FY2023, #31 in FY2024 and #22 in FY2025; up 9 since FY2020.
25	Cook Inlet Region Inc. 9 awardees, including North Wind Portage, Inc., OSC Technical Solutions, LLC and Portsmouth Mission Alliance, LLC Top NAICS codes 562910 Remediation Services 562211 Hazardous Waste Treatment and Disposal 561210 Facilities Support Services	$139,952,854	0.4%	Rank history: #34 in FY2022, #38 in FY2023, #60 in FY2024 and not on the FY2025 list; up 9 since FY2020.
26	Parsons Corporation 2 awardees, including Parsons Government Services Inc. Top NAICS codes 236210 Industrial Building Construction 541611 Administrative Management and General Management Consulting Services	$132,292,886	0.3%	Rank history: #43 in FY2022, #48 in FY2023, #39 in FY2024 and #43 in FY2025; up 13 since FY2020.
27	Mid-America Conversion Services, LLC Top NAICS codes 325180 Other Basic Inorganic Chemical Manufacturing	$127,944,659	0.3%	Rank history: #28 in FY2022, #25 in FY2023, #32 in FY2024 and #33 in FY2025; up 8 since FY2020.
28	Jacobs Engineering Group Inc. 4 awardees, including Ch2M Hill Plateau Remediation Company, Ch2M Hill Constructors, Inc. and Blue Canopy Group, LLC Top NAICS codes 562910 Remediation Services 541330 Engineering Services 541512 Computer Systems Design Services	$116,464,956	0.3%	Rank history: not on the FY2022 list, #32 in FY2023, #22 in FY2024 and not on the FY2025 list; down 10 since FY2020.
29	Triple Canopy Inc. Through Centerra Group, LLC Top NAICS codes 561612 Security Guards and Patrol Services	$94,996,862	0.2%	Rank history: #26 in FY2022, #26 in FY2023 and not on the FY2024–FY2025 lists; up 7 since FY2020.
30	Ch2M Hill Bwxt West Valley, LLC Top NAICS codes 562910 Remediation Services	$89,609,295	0.2%	Rank history: #30 in FY2022, #30 in FY2023, #64 in FY2024 and not on the FY2025 list; up 10 since FY2020.
31	Criterion Systems, L.L.C. Top NAICS codes 541513 Computer Facilities Management Services	$69,179,725	0.2%	Rank history: #38 in FY2022, #39 in FY2023, #63 in FY2024 and not on the FY2025 list; up 10 since FY2020.
32	Navarro Research and Engineering, Inc. Top NAICS codes 562910 Remediation Services	$66,375,536	0.2%	Rank history: #37 in FY2022, #37 in FY2023, #41 in FY2024 and #39 in FY2025; up 5 since FY2020.
33	RSI Entech, LLC Top NAICS codes 562910 Remediation Services	$63,990,610	0.2%	Rank history: #29 in FY2022, #29 in FY2023, #35 in FY2024 and not on the FY2025 list; up 123 since FY2020.
34	Iowa State University of Science and Technology	$60,879,866	0.2%	Rank history: #33 in FY2022, #27 in FY2023, #40 in FY2024 and #31 in FY2025; up 10 since FY2020.
35	Nuclear Waste Partnership LLC Top NAICS codes 561210 Facilities Support Services	$60,619,531	0.2%	Rank history: #74 in FY2022 and not on the FY2023–FY2025 lists; down 6 since FY2020.
36	Atkins Nuclear Secured Holdings Corporation Through Isotek Systems, LLC Top NAICS codes 561990 All Other Support Services	$54,633,150	0.1%	Rank history: #35 in FY2022, #42 in FY2023 and not on the FY2024–FY2025 lists; up 19 since FY2020.
37	Regents of the University of California the (4458)	$53,970,000	0.1%	Rank history: #79 in FY2022, #57 in FY2023, #70 in FY2024 and #69 in FY2025; up 9 since FY2020.
38	Fluor-Bwxt Portsmouth LLC Top NAICS codes 562910 Remediation Services	$50,963,000	0.1%	Rank history: #52 in FY2022 and not on the FY2023–FY2025 lists; down 13 since FY2020.
39	Information International Associates Inc. 2 awardees, including Keylogic, LLC and Keylogic Associates, Inc. Top NAICS codes 541330 Engineering Services 541611 Administrative Management and General Management Consulting Services	$50,160,492	0.1%	Rank history: #40 in FY2022, #36 in FY2023 and not on the FY2024–FY2025 lists; up 169 since FY2020.
40	The Day & Zimmermann Group, Inc. Through SOC LLC Top NAICS codes 561612 Security Guards and Patrol Services	$48,989,207	0.1%	Rank history: #39 in FY2022, #61 in FY2023 and not on the FY2024–FY2025 lists; up 10 since FY2020.
41	Aarcorp 2 awardees, including AAR Government Services, Inc. Top NAICS codes 488190 Other Support Activities for Air Transportation	$41,333,598	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
42	Arctic Slope Regional Corporation Through Asrc Consulting & Environmental Services, LLC Top NAICS codes 213112 Support Activities for Oil and Gas Operations	$40,802,256	0.1%	Rank history: not on the FY2022–FY2024 lists and #29 in FY2025; new, not ranked in FY2020.
43	Centrus Energy Corp. 2 awardees, including American Centrifuge Operating, LLC and United States Enrichment Corporation Top NAICS codes 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology) 561210 Facilities Support Services	$39,900,942	0.1%	Rank history: #62 in FY2022, #43 in FY2023, #72 in FY2024 and not on the FY2025 list; up 26 since FY2020.
44	WE2 Support Services 8A JV LLC Top NAICS codes 561210 Facilities Support Services	$39,110,341	0.1%	Rank history: #46 in FY2022, #41 in FY2023, #51 in FY2024 and #70 in FY2025; up 14 since FY2020.
45	Tech2 Solutions Top NAICS codes 237990 Other Heavy and Civil Engineering Construction	$38,976,562	0.1%	Rank history: #64 in FY2022, #72 in FY2023, #87 in FY2024 and not on the FY2025 list; up 25 since FY2020.
46	Boston Government Services, LLC Top NAICS codes 541620 Environmental Consulting Services	$38,974,274	0.1%	Rank history: #44 in FY2022, #52 in FY2023 and not on the FY2024–FY2025 lists; up 8 since FY2020.
47	Hanford Laboratory Management and Integration LLC Top NAICS codes 562910 Remediation Services	$37,946,839	0.1%	Rank history: #31 in FY2022, #31 in FY2023, #33 in FY2024 and #34 in FY2025; up 220 since FY2020.
48	Mele Associates Inc. Top NAICS codes 541330 Engineering Services	$36,707,630	0.1%	Rank history: #36 in FY2022, #34 in FY2023, #37 in FY2024 and #32 in FY2025; up 1 since FY2020.
49	Project Enhancement Corporation Top NAICS codes 541620 Environmental Consulting Services	$35,997,001	0.1%	Rank history: #47 in FY2022, #44 in FY2023, #48 in FY2024 and #46 in FY2025; up 2 since FY2020.
50	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	$35,420,042	0.1%	Rank history: #45 in FY2022, #40 in FY2023, #42 in FY2024 and #42 in FY2025; up 14 since FY2020.
51	Unwin Co Top NAICS codes 541690 Other Scientific and Technical Consulting Services	$33,705,862	0.1%	Rank history: #48 in FY2022, #49 in FY2023, #54 in FY2024 and #57 in FY2025; up 12 since FY2020.
52	Swift & Staley Inc. Top NAICS codes 561210 Facilities Support Services	$32,281,855	0.1%	Rank history: #41 in FY2022, #51 in FY2023, #55 in FY2024 and #61 in FY2025; down 9 since FY2020.
53	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)	$31,650,000	0.1%	Rank history: #54 in FY2022, #50 in FY2023 and not on the FY2024–FY2025 lists; up 98 since FY2020.
54	Regan Technologies Corp Top NAICS codes 541519 Other Computer Related Services 511210 Software Publishers	$31,583,312	0.1%	Rank history: #42 in FY2022 and not on the FY2023–FY2025 lists; up 6 since FY2020.
55	Apogee Group, LLC Top NAICS codes 237990 Other Heavy and Civil Engineering Construction 541519 Other Computer Related Services	$28,758,382	0.1%	Rank history: #63 in FY2022, #46 in FY2023 and not on the FY2024–FY2025 lists; down 3 since FY2020.
56	Goldbelt, Incorporated 3 awardees, including Goldbelt Operations Support Services, LLC and Facility Support Services LLC Top NAICS codes 236220 Commercial and Institutional Building Construction	$26,269,567	0.1%	Rank history: not on the FY2022–FY2025 lists; up 22 since FY2020.
57	Techsource, LLC Top NAICS codes 541330 Engineering Services	$25,680,345	0.1%	Rank history: #57 in FY2022, #56 in FY2023, #53 in FY2024 and not on the FY2025 list; down 1 since FY2020.
58	Carahsoft Technology Corp Top NAICS codes 511210 Software Publishers 541519 Other Computer Related Services 519190 All Other Information Services	$22,715,003	0.1%	Rank history: #32 in FY2022, not on the FY2023 list, #57 in FY2024 and #65 in FY2025; up 7 since FY2020.
59	Nuclear Fuel Services Inc. Top NAICS codes 325180 Other Basic Inorganic Chemical Manufacturing	$22,035,318	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
60	Kupono Government Services, LLC Top NAICS codes 611430 Professional and Management Development Training	$20,562,988	0.1%	Rank history: #67 in FY2022, #67 in FY2023, #73 in FY2024 and not on the FY2025 list; up 17 since FY2020.
61	Enterprise Technical Assistance Services Inc. Top NAICS codes 562910 Remediation Services	$19,628,505	0.1%	Rank history: #65 in FY2022, #60 in FY2023, #66 in FY2024 and not on the FY2025 list; up 14 since FY2020.
62	Buckeye Terminals LLC Top NAICS codes 493190 Other Warehousing and Storage	$19,518,980	0.1%	Rank history: #61 in FY2022, #83 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
63	IMG - Crown Energy Services Joint Venture, LLC Top NAICS codes 518210 Computing Infrastructure Providers, Data Processing, Web Hosting, and Related Services	$19,487,339	0.1%	Rank history: not on the FY2022 list, #79 in FY2023, not on the FY2024 list and #96 in FY2025; up 17 since FY2020.
64	Appsential LLC Top NAICS codes 541513 Computer Facilities Management Services 541519 Other Computer Related Services	$19,442,966	0.1%	Rank history: not on the FY2022–FY2025 lists; down 7 since FY2020.
65	Vector Resource Inc. Top NAICS codes 541611 Administrative Management and General Management Consulting Services	$17,437,585	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 20 since FY2020.
66	The Aerospace Corporation Top NAICS codes 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology)	$17,300,001	<0.1%	Rank history: #53 in FY2022, #59 in FY2023, #59 in FY2024 and #52 in FY2025; up 16 since FY2020.
67	Intepros Federal Incorporated Top NAICS codes 541513 Computer Facilities Management Services	$17,159,526	<0.1%	Rank history: #71 in FY2022, #68 in FY2023 and not on the FY2024–FY2025 lists; down 6 since FY2020.
68	Edgewater Federal Solutions, Inc. Top NAICS codes 518210 Computing Infrastructure Providers, Data Processing, Web Hosting, and Related Services 541519 Other Computer Related Services	$17,095,678	<0.1%	Rank history: #60 in FY2022, #66 in FY2023, #74 in FY2024 and #71 in FY2025; up 6 since FY2020.
69	Westinghouse Electric Company LLC Through Westinghouse Government Services LLC Top NAICS codes 334517 Irradiation Apparatus Manufacturing	$16,846,555	<0.1%	Rank history: #68 in FY2022, #88 in FY2023 and not on the FY2024–FY2025 lists; up 17 since FY2020.
70	EMCOR Group, Inc. Through Emcor Government Services, Inc. Top NAICS codes 561210 Facilities Support Services	$15,516,090	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 60 since FY2020.
71	Southwest Research Institute Top NAICS codes 541330 Engineering Services 541611 Administrative Management and General Management Consulting Services 541690 Other Scientific and Technical Consulting Services	$14,924,782	<0.1%	Rank history: #91 in FY2022, not on the FY2023 list, #95 in FY2024 and not on the FY2025 list; up 13 since FY2020.
72	Confederated Salish and Kootenai Tribes 2 awardees, including S & K Logistics Services LLC and S & K Federal Services LLC Top NAICS codes 562910 Remediation Services 561210 Facilities Support Services 541330 Engineering Services	$14,036,229	<0.1%	Rank history: #89 in FY2022, #71 in FY2023 and not on the FY2024–FY2025 lists; up 39 since FY2020.
73	Technomics Inc. Top NAICS codes 541330 Engineering Services	$13,944,846	<0.1%	Rank history: #99 in FY2022, #97 in FY2023, #79 in FY2024 and #72 in FY2025; up 25 since FY2020.
74	Maximus Federal Technology Solutions, LLC Top NAICS codes 541512 Computer Systems Design Services 541511 Custom Computer Programming Services	$13,817,432	<0.1%	Rank history: not on the FY2022–FY2025 lists; down 15 since FY2020.
75	Guidehouse Inc. Top NAICS codes 541611 Administrative Management and General Management Consulting Services 541612 Human Resources Consulting Services	$13,747,962	<0.1%	Rank history: #56 in FY2022, #53 in FY2023 and not on the FY2024–FY2025 lists; up 1 since FY2020.
76	Evoke Research and Consulting, LLC Top NAICS codes 541519 Other Computer Related Services	$13,732,574	<0.1%	Rank history: #87 in FY2022, #89 in FY2023 and not on the FY2024–FY2025 lists; up 23 since FY2020.
77	BTP Services, LLC Top NAICS codes 541620 Environmental Consulting Services	$13,081,581	<0.1%	Rank history: #77 in FY2022 and not on the FY2023–FY2025 lists; up 30 since FY2020.
78	Allegheny Science & Technology Corporation Top NAICS codes 541330 Engineering Services 541990 All Other Professional, Scientific, and Technical Services	$12,704,730	<0.1%	Rank history: #83 in FY2022, #76 in FY2023, #80 in FY2024 and #74 in FY2025; up 15 since FY2020.
79	ICF International, Inc. 2 awardees, including ICF Incorporated, L.L.C. and ICF Resources, L.L.C. Top NAICS codes 541611 Administrative Management and General Management Consulting Services 541330 Engineering Services	$12,456,674	<0.1%	Rank history: #76 in FY2022, #64 in FY2023 and not on the FY2024–FY2025 lists; up 2 since FY2020.
80	Northbound Solutions LLC Top NAICS codes 541611 Administrative Management and General Management Consulting Services	$12,347,799	<0.1%	Rank history: #72 in FY2022 and not on the FY2023–FY2025 lists; up 21 since FY2020.
81	Global Engineering & Technology Inc. Top NAICS codes 541690 Other Scientific and Technical Consulting Services 811213 Communication Equipment Repair and Maintenance	$12,339,427	<0.1%	Rank history: #93 in FY2022 and not on the FY2023–FY2025 lists; up 6 since FY2020.
82	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	$11,969,526	<0.1%	Rank history: #81 in FY2022, #70 in FY2023, not on the FY2024 list and #63 in FY2025; up 394 since FY2020.
83	Alvarez LLC Top NAICS codes 541519 Other Computer Related Services	$11,780,980	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 14 since FY2020.
84	Alliance Data Systems Corporation Through Epsilon Inc. Top NAICS codes 541512 Computer Systems Design Services	$11,701,973	<0.1%	Rank history: #73 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
85	RSI Nuclear, LLC Top NAICS codes 541330 Engineering Services 541690 Other Scientific and Technical Consulting Services	$11,511,454	<0.1%	Rank history: #80 in FY2022 and not on the FY2023–FY2025 lists; up 97 since FY2020.
86	Centerra Group, LLC Top NAICS codes 561612 Security Guards and Patrol Services	$11,400,000	<0.1%	Rank history: not on the FY2022–FY2023 lists, #69 in FY2024 and not on the FY2025 list; up 63 since FY2020.
87	Golden Svcs, LLC Top NAICS codes 561612 Security Guards and Patrol Services	$11,063,123	<0.1%	Rank history: #95 in FY2022 and not on the FY2023–FY2025 lists; up 4 since FY2020.
88	Tetra Tech, Inc. 4 awardees, including Bluewater Federal Solutions, Inc. and Tetra TECH EC, Inc. Top NAICS codes 541330 Engineering Services 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology) 541620 Environmental Consulting Services	$10,948,126	<0.1%	Rank history: #78 in FY2022, #93 in FY2023, #81 in FY2024 and #66 in FY2025; up 104 since FY2020.
89	Kpmg L.L.P. Top NAICS codes 541211 Offices of Certified Public Accountants	$10,776,422	<0.1%	Rank history: #86 in FY2022, #91 in FY2023 and not on the FY2024–FY2025 lists; up 50 since FY2020.
90	Kbr, Inc. Through Dependable Global Solutions, LLC Top NAICS codes 541690 Other Scientific and Technical Consulting Services	$10,676,744	<0.1%	Rank history: not on the FY2022 list, #77 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
91	Innovative Management Concepts, Inc. Top NAICS codes 541512 Computer Systems Design Services	$10,535,486	<0.1%	Rank history: not on the FY2022–FY2025 lists; down 2 since FY2020.
92	Colonial Metals, Inc. Top NAICS codes 332999 All Other Miscellaneous Fabricated Metal Product Manufacturing	$10,378,658	<0.1%	Rank history: #75 in FY2022, #94 in FY2023 and not on the FY2024–FY2025 lists; up 30 since FY2020.
93	Wastren, Inc. Through VNS Federal Services LLC Top NAICS codes 562910 Remediation Services 541712 Research and Development in the Physical, Engineering, and Life Sciences (except Biotechnology)	$10,274,873	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 24 since FY2020.
94	Wyandotte Nation 2 awardees, including Wyandotte Technologies and Wyandotte Services Top NAICS codes 561210 Facilities Support Services 541990 All Other Professional, Scientific, and Technical Services 541690 Other Scientific and Technical Consulting Services	$10,270,792	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 15 since FY2020.
95	Paragon Professional Services LLC Top NAICS codes 562910 Remediation Services	$10,184,785	<0.1%	Rank history: not on the FY2022 list, #100 in FY2023, #94 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
96	Attainx Inc. Top NAICS codes 541611 Administrative Management and General Management Consulting Services	$10,182,322	<0.1%	Rank history: #97 in FY2022 and not on the FY2023–FY2025 lists; up 71 since FY2020.
97	Four Rivers Nuclear Partnership LLC Top NAICS codes 562910 Remediation Services	$9,798,104	<0.1%	Rank history: #92 in FY2022, #69 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
98	Nana Regional Corporation Inc 5 awardees, including Tuva LLC, Talu LLC and Rivertech LLC Top NAICS codes 541690 Other Scientific and Technical Consulting Services 337127 Institutional Furniture Manufacturing 541330 Engineering Services	$9,340,475	<0.1%	Rank history: #96 in FY2022 and not on the FY2023–FY2025 lists; up 4 since FY2020.
99	Skookum Educational Programs Top NAICS codes 561210 Facilities Support Services	$9,316,387	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 16 since FY2020.
100	Professional Project Services, Inc. Top NAICS codes 562910 Remediation Services 511210 Software Publishers	$9,123,643	<0.1%	Rank history: #94 in FY2022, not on the FY2023–FY2024 lists and #76 in FY2025; unchanged since FY2020.

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 $38.6 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 2021 ran Oct 1, 2020 – Sep 30, 2021. 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 FY2020. "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 FY2020 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.

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