Top 100 Environmental Protection Agency Contractors, FY2021

Full ranking

Rank	Contractor	Net obligations	Share	Trend
1	General Dynamics Corporation 7 awardees, including General Dynamics Information Technology, Inc. and Csra LLC Top NAICS codes 541512 Computer Systems Design Services 541611 Administrative Management and General Management Consulting Services 541620 Environmental Consulting Services	$100,433,243	5.9%	Rank history: #3 in FY2022, #1 in FY2023, #2 in FY2024 and #2 in FY2025; unchanged since FY2020.
2	Environmental Restoration LLC Top NAICS codes 562910 Remediation Services	$83,255,963	4.9%	Rank history: #2 in FY2022, #5 in FY2023, #9 in FY2024 and #4 in FY2025; unchanged since FY2020.
3	Science Applications International Corporation Top NAICS codes 541512 Computer Systems Design Services 541620 Environmental Consulting Services	$59,906,857	3.5%	Rank history: #7 in FY2022, #58 in FY2023, #32 in FY2024 and #32 in FY2025; up 1 since FY2020.
4	Tetra Tech, Inc. 15 awardees Top NAICS codes 541620 Environmental Consulting Services 562910 Remediation Services 541611 Administrative Management and General Management Consulting Services	$59,521,855	3.5%	Rank history: #4 in FY2022, #2 in FY2023, #5 in FY2024 and #9 in FY2025; up 3 since FY2020.
5	EA Engineering, Science, and Technology, Inc., PBC Top NAICS codes 562910 Remediation Services	$57,081,911	3.3%	Rank history: #1 in FY2022, #3 in FY2023, #3 in FY2024 and #7 in FY2025; up 1 since FY2020.
6	Jacobs Engineering Group Inc. 11 awardees, including Ch2M Hill, Inc., Jacobs Project Management Co. and Amentum Technology, Inc. Top NAICS codes 562910 Remediation Services 237990 Other Heavy and Civil Engineering Construction 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology)	$56,355,986	3.3%	Rank history: #14 in FY2022, #6 in FY2023, #74 in FY2024 and not on the FY2025 list; down 1 since FY2020.
7	Eastern Research Group Inc. Top NAICS codes 541620 Environmental Consulting Services 541990 All Other Professional, Scientific, and Technical Services 541380 Testing Laboratories and Services	$53,347,531	3.1%	Rank history: #6 in FY2022, #7 in FY2023, #4 in FY2024 and #8 in FY2025; down 4 since FY2020.
8	CGI Technologies and Solutions Inc. 2 awardees, including CGI Federal Inc. Top NAICS codes 541512 Computer Systems Design Services 518210 Computing Infrastructure Providers, Data Processing, Web Hosting, and Related Services 511210 Software Publishers	$47,538,667	2.8%	Rank history: #8 in FY2022, #14 in FY2023, #25 in FY2024 and not on the FY2025 list; up 1 since FY2020.
9	ICF International, Inc. Through ICF Incorporated, L.L.C. Top NAICS codes 541620 Environmental Consulting Services 541611 Administrative Management and General Management Consulting Services 541990 All Other Professional, Scientific, and Technical Services	$42,886,814	2.5%	Rank history: #10 in FY2022, #10 in FY2023, #24 in FY2024 and not on the FY2025 list; up 3 since FY2020.
10	Camp Dresser & Mckee Inc. 5 awardees, including CDM Federal Programs Corporation Top NAICS codes 562910 Remediation Services 541330 Engineering Services 541620 Environmental Consulting Services	$34,617,017	2.0%	Rank history: #9 in FY2022, #50 in FY2023 and not on the FY2024–FY2025 lists; up 3 since FY2020.
11	SRA International Inc. Through General Dynamics Information Technology, Inc. Top NAICS codes 541512 Computer Systems Design Services 541330 Engineering Services 541519 Other Computer Related Services	$27,091,305	1.6%	Rank history: #71 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
12	Arctic Slope Regional Corporation 4 awardees, including Environmental Quality Management, Inc., EQM Services, LLC and Vistronix, LLC Top NAICS codes 562910 Remediation Services 541519 Other Computer Related Services	$25,725,454	1.5%	Rank history: #44 in FY2022, #8 in FY2023, #36 in FY2024 and #3 in FY2025; up 17 since FY2020.
13	Arctic Slope Mission Services LLC Top NAICS codes 541990 All Other Professional, Scientific, and Technical Services	$25,022,323	1.5%	Rank history: #19 in FY2022, #91 in FY2023 and not on the FY2024–FY2025 lists; down 3 since FY2020.
14	Sevenson Environmental Services, Inc. Top NAICS codes 562910 Remediation Services	$24,062,330	1.4%	Rank history: #13 in FY2022, #19 in FY2023, #1 in FY2024 and #1 in FY2025; down 3 since FY2020.
15	Hydrogeologic, Inc. Top NAICS codes 562910 Remediation Services	$22,879,717	1.3%	Rank history: #15 in FY2022, #9 in FY2023, #6 in FY2024 and #11 in FY2025; down 1 since FY2020.
16	Kemron Environmental Services, Inc. Top NAICS codes 562910 Remediation Services	$21,986,613	1.3%	Rank history: #18 in FY2022, #21 in FY2023 and not on the FY2024–FY2025 lists; up 9 since FY2020.
17	Booz Allen Hamilton Holding Corporation Through Booz Allen Hamilton Inc. Top NAICS codes 541512 Computer Systems Design Services 561621 Security Systems Services (except Locksmiths) 541519 Other Computer Related Services	$21,360,647	1.2%	Rank history: #23 in FY2022, #24 in FY2023, #28 in FY2024 and #28 in FY2025; up 6 since FY2020.
18	Research Triangle Institute Top NAICS codes 541620 Environmental Consulting Services 541611 Administrative Management and General Management Consulting Services 541712 Research and Development in the Physical, Engineering, and Life Sciences (except Biotechnology)	$20,953,937	1.2%	Rank history: #20 in FY2022, #16 in FY2023, #18 in FY2024 and #20 in FY2025; down 2 since FY2020.
19	Guardian Environmental Services Co Inc. Top NAICS codes 562910 Remediation Services	$19,674,091	1.1%	Rank history: not on the FY2022–FY2025 lists; up 32 since FY2020.
20	Weston Solutions Holdings, Inc. 4 awardees, including Weston Solutions Inc. Top NAICS codes 541620 Environmental Consulting Services 561210 Facilities Support Services	$19,022,756	1.1%	Rank history: #12 in FY2022, #18 in FY2023, #19 in FY2024 and #5 in FY2025; down 1 since FY2020.
21	Ayuda MC2 JV LLC Top NAICS codes 562910 Remediation Services	$17,894,268	1.0%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
22	Chenega It Enterprise Services, LLC Top NAICS codes 518210 Computing Infrastructure Providers, Data Processing, Web Hosting, and Related Services	$17,094,209	1.0%	Rank history: #51 in FY2022, #60 in FY2023, #52 in FY2024 and #35 in FY2025; down 1 since FY2020.
23	AECOM 2 awardees, including URS Group, Inc. and AECOM Technical Services, Inc. Top NAICS codes 562910 Remediation Services 541330 Engineering Services 541620 Environmental Consulting Services	$14,666,648	0.9%	Rank history: #11 in FY2022, #4 in FY2023, #78 in FY2024 and #84 in FY2025; up 34 since FY2020.
24	Dell Federal Systems L.P. 3 awardees, including Dell Marketing L.P. Top NAICS codes 541519 Other Computer Related Services 511210 Software Publishers	$14,186,232	0.8%	Rank history: #31 in FY2022, #25 in FY2023 and not on the FY2024–FY2025 lists; up 67 since FY2020.
25	Aptim Federal Services LLC Top NAICS codes 541620 Environmental Consulting Services 562910 Remediation Services 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology)	$14,163,272	0.8%	Rank history: #22 in FY2022, #22 in FY2023 and not on the FY2024–FY2025 lists; down 7 since FY2020.
26	Wood Environment & Infrastructure Solutions Inc. 3 awardees, including WSP USA Environment & Infrastructure Inc. and Wood Programs Inc. Top NAICS codes 541620 Environmental Consulting Services 561210 Facilities Support Services 541380 Testing Laboratories and Services	$13,256,611	0.8%	Rank history: #78 in FY2022, #41 in FY2023, #68 in FY2024 and not on the FY2025 list; up 9 since FY2020.
27	MCP Computer Products Inc. Top NAICS codes 443120 Computer and Software Stores	$13,243,964	0.8%	Rank history: #37 in FY2022, #35 in FY2023, #55 in FY2024 and #42 in FY2025; up 27 since FY2020.
28	Oak Ridge Associated Universities, Incorporated Top NAICS codes 541990 All Other Professional, Scientific, and Technical Services	$13,140,225	0.8%	Rank history: #30 in FY2022, #26 in FY2023, #44 in FY2024 and not on the FY2025 list; unchanged since FY2020.
29	Ardl Inc. Top NAICS codes 541620 Environmental Consulting Services	$12,362,914	0.7%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
30	EQ & CH Remediation Top NAICS codes 562910 Remediation Services	$11,277,327	0.7%	Rank history: #39 in FY2022, #38 in FY2023, #22 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
31	Nobis Engineering, Inc. Top NAICS codes 562910 Remediation Services	$10,771,991	0.6%	Rank history: #33 in FY2022, #95 in FY2023, #34 in FY2024 and not on the FY2025 list; up 53 since FY2020.
32	C M C, Inc. Top NAICS codes 562910 Remediation Services	$10,755,863	0.6%	Rank history: #16 in FY2022, #13 in FY2023, #23 in FY2024 and #51 in FY2025; down 15 since FY2020.
33	Skinner Development Inc. Top NAICS codes 236220 Commercial and Institutional Building Construction	$10,551,559	0.6%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
34	The Cadmus Group LLC Top NAICS codes 541611 Administrative Management and General Management Consulting Services 541620 Environmental Consulting Services	$10,339,971	0.6%	Rank history: #32 in FY2022, #28 in FY2023, #12 in FY2024 and #34 in FY2025; down 10 since FY2020.
35	Leisnoi Diversified Services, LLC Top NAICS codes 562910 Remediation Services	$10,035,316	0.6%	Rank history: #35 in FY2022, #45 in FY2023, #41 in FY2024 and #43 in FY2025; new, not ranked in FY2020.
36	Patriot LLC Top NAICS codes 541512 Computer Systems Design Services	$9,973,954	0.6%	Rank history: #29 in FY2022, #43 in FY2023, #54 in FY2024 and #94 in FY2025; down 2 since FY2020.
37	SRC Inc. Top NAICS codes 541620 Environmental Consulting Services 541712 Research and Development in the Physical, Engineering, and Life Sciences (except Biotechnology)	$9,776,705	0.6%	Rank history: #46 in FY2022, #51 in FY2023, #61 in FY2024 and #76 in FY2025; up 5 since FY2020.
38	Hdr, Inc. 3 awardees, including HDR Aptim LLC and Henningson, Durham & Richardson, P.C Top NAICS codes 562910 Remediation Services	$9,136,394	0.5%	Rank history: #28 in FY2022, #29 in FY2023, #70 in FY2024 and #40 in FY2025; up 81 since FY2020.
39	ABT Global LLC 2 awardees Top NAICS codes 541620 Environmental Consulting Services 541611 Administrative Management and General Management Consulting Services	$8,695,709	0.5%	Rank history: #42 in FY2022, #40 in FY2023 and not on the FY2024–FY2025 lists; up 10 since FY2020.
40	Innovate! Inc. Top NAICS codes 541512 Computer Systems Design Services	$8,135,712	0.5%	Rank history: #92 in FY2022 and not on the FY2023–FY2025 lists; up 7 since FY2020.
41	Kemron / Arrowhead JV, LLC Top NAICS codes 562910 Remediation Services	$7,988,834	0.5%	Rank history: #21 in FY2022, #15 in FY2023 and not on the FY2024–FY2025 lists; up 14 since FY2020.
42	A and M Engineering & Environmental Services, Inc. Top NAICS codes 562910 Remediation Services	$7,929,157	0.5%	Rank history: #47 in FY2022, not on the FY2023 list, #60 in FY2024 and #44 in FY2025; up 59 since FY2020.
43	Systalex Corporation Top NAICS codes 541519 Other Computer Related Services 541511 Custom Computer Programming Services	$7,743,956	0.5%	Rank history: #49 in FY2022, #49 in FY2023, #42 in FY2024 and #41 in FY2025; up 56 since FY2020.
44	Battelle Memorial Institute Top NAICS codes 541712 Research and Development in the Physical, Engineering, and Life Sciences (except Biotechnology) 541620 Environmental Consulting Services 541611 Administrative Management and General Management Consulting Services	$7,286,972	0.4%	Rank history: #56 in FY2022, #63 in FY2023, #63 in FY2024 and #78 in FY2025; down 18 since FY2020.
45	Pegasus Technical Services, Inc. Top NAICS codes 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology) 541712 Research and Development in the Physical, Engineering, and Life Sciences (except Biotechnology)	$6,813,338	0.4%	Rank history: #57 in FY2022, #55 in FY2023, #65 in FY2024 and #60 in FY2025; up 16 since FY2020.
46	Techlaw, Inc. 2 awardees, including Techlaw Consultants Inc. Top NAICS codes 562910 Remediation Services 541380 Testing Laboratories and Services	$6,758,430	0.4%	Rank history: #43 in FY2022, #48 in FY2023 and not on the FY2024–FY2025 lists; up 61 since FY2020.
47	Millerknoll Inc. Top NAICS codes 337214 Office Furniture (except Wood) Manufacturing	$6,659,113	0.4%	Rank history: not on the FY2022–FY2025 lists; up 407 since FY2020.
48	Maximus Federal Technology Solutions, LLC Top NAICS codes 541512 Computer Systems Design Services 541511 Custom Computer Programming Services	$6,587,666	0.4%	Rank history: not on the FY2022–FY2025 lists; down 16 since FY2020.
49	Arcadis N.V. 2 awardees, including Arcadis U.s., Inc. Top NAICS codes 541330 Engineering Services	$6,134,149	0.4%	Rank history: #36 in FY2022, #68 in FY2023 and not on the FY2024–FY2025 lists; up 22 since FY2020.
50	M.c. Dean, Inc. Top NAICS codes 541330 Engineering Services	$6,009,815	0.4%	Rank history: #64 in FY2022, #69 in FY2023, #57 in FY2024 and #63 in FY2025; up 157 since FY2020.
51	MG Facility Services, LLC Top NAICS codes 236220 Commercial and Institutional Building Construction	$5,489,780	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
52	Deloitte LLP 2 awardees, including Deloitte Consulting LLP and Deloitte Financial Advisory Services LLP Top NAICS codes 541512 Computer Systems Design Services 541611 Administrative Management and General Management Consulting Services	$5,429,127	0.3%	Rank history: #83 in FY2022 and not on the FY2023–FY2025 lists; up 153 since FY2020.
53	Consolidated Safety Services Incorporated Top NAICS codes 541380 Testing Laboratories and Services 541620 Environmental Consulting Services 541712 Research and Development in the Physical, Engineering, and Life Sciences (except Biotechnology)	$5,160,043	0.3%	Rank history: #65 in FY2022, #61 in FY2023, #95 in FY2024 and #45 in FY2025; up 5 since FY2020.
54	Thermo Electron Corporation 9 awardees, including Thermo Electron North America LLC, Thermo Environmental Instruments LLC and Fisher Scientific Company L.L.C. Top NAICS codes 334516 Analytical Laboratory Instrument Manufacturing 811219 Other Electronic and Precision Equipment Repair and Maintenance 339113 Surgical Appliance and Supplies Manufacturing	$4,984,864	0.3%	Rank history: not on the FY2022–FY2025 lists; up 120 since FY2020.
55	Lintech Global Inc. Top NAICS codes 541511 Custom Computer Programming Services 541512 Computer Systems Design Services	$4,887,925	0.3%	Rank history: #53 in FY2022 and not on the FY2023–FY2025 lists; up 8 since FY2020.
56	Horsley Witten Group, Inc. Top NAICS codes 541620 Environmental Consulting Services	$4,529,559	0.3%	Rank history: #100 in FY2022, #86 in FY2023, #84 in FY2024 and not on the FY2025 list; up 21 since FY2020.
57	Southwest Research Institute Top NAICS codes 541330 Engineering Services 541380 Testing Laboratories and Services 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology)	$4,408,072	0.3%	Rank history: #61 in FY2022 and not on the FY2023–FY2025 lists; up 7 since FY2020.
58	OCH JV Top NAICS codes 562910 Remediation Services	$4,401,976	0.3%	Rank history: not on the FY2022–FY2023 lists, #33 in FY2024 and not on the FY2025 list; up 21 since FY2020.
59	Toeroek Associates, Inc. Top NAICS codes 541620 Environmental Consulting Services 562910 Remediation Services	$4,395,227	0.3%	Rank history: #41 in FY2022, #42 in FY2023, #88 in FY2024 and #72 in FY2025; down 21 since FY2020.
60	Diversified Protection Corp Top NAICS codes 561612 Security Guards and Patrol Services	$4,274,264	0.2%	Rank history: #75 in FY2022, #84 in FY2023, #91 in FY2024 and #86 in FY2025; up 132 since FY2020.
61	Leidos Holdings, Inc. 6 awardees, including Leidos, Inc. Top NAICS codes 541512 Computer Systems Design Services 541611 Administrative Management and General Management Consulting Services 541330 Engineering Services	$4,113,505	0.2%	Rank history: #72 in FY2022, #59 in FY2023 and not on the FY2024–FY2025 lists; down 13 since FY2020.
62	Ch2M Hill, Inc. Top NAICS codes 562910 Remediation Services 541330 Engineering Services	$3,955,365	0.2%	Rank history: #17 in FY2022, #100 in FY2023, #11 in FY2024 and #14 in FY2025; down 12 since FY2020.
63	National Academy of Sciences Top NAICS codes 541690 Other Scientific and Technical Consulting Services	$3,915,396	0.2%	Rank history: not on the FY2022–FY2025 lists; up 4 since FY2020.
64	Duke Energy Corporation Through Duke Energy Progress, LLC Top NAICS codes 221122 Electric Power Distribution	$3,900,000	0.2%	Rank history: #88 in FY2022, #96 in FY2023, #90 in FY2024 and not on the FY2025 list; up 24 since FY2020.
65	Industrial Economics Inc. Top NAICS codes 541620 Environmental Consulting Services 541611 Administrative Management and General Management Consulting Services	$3,866,570	0.2%	Rank history: #54 in FY2022, #76 in FY2023 and not on the FY2024–FY2025 lists; down 12 since FY2020.
66	Biospyder Technologies, Inc. Top NAICS codes 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology) 541714 Research and Development in Biotechnology (except Nanobiotechnology)	$3,817,994	0.2%	Rank history: not on the FY2022–FY2025 lists; up 175 since FY2020.
67	Nana Regional Corporation Inc Through Affigent, LLC Top NAICS codes 541519 Other Computer Related Services	$3,775,672	0.2%	Rank history: #76 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
68	Veracity Consulting, Inc. Top NAICS codes 541519 Other Computer Related Services	$3,719,610	0.2%	Rank history: #62 in FY2022, #74 in FY2023, not on the FY2024 list and #73 in FY2025; down 3 since FY2020.
69	Ace-Sydan, LLC Top NAICS codes 541512 Computer Systems Design Services	$3,690,940	0.2%	Rank history: not on the FY2022–FY2025 lists; up 14 since FY2020.
70	Great Lakes Environmental Center, Inc. Top NAICS codes 541620 Environmental Consulting Services	$3,673,996	0.2%	Rank history: #48 in FY2022, #47 in FY2023, #58 in FY2024 and #64 in FY2025; up 2 since FY2020.
71	Environmental Management Support, Inc. Top NAICS codes 541620 Environmental Consulting Services	$3,520,658	0.2%	Rank history: #99 in FY2022, #92 in FY2023, #93 in FY2024 and #68 in FY2025; up 2 since FY2020.
72	Skeo Solutions, Inc. Top NAICS codes 541620 Environmental Consulting Services	$3,508,914	0.2%	Rank history: #26 in FY2022, #33 in FY2023, #43 in FY2024 and #69 in FY2025; down 41 since FY2020.
73	Centerpoint Energy, Inc. Through Energy Systems Group, LLC Top NAICS codes 541330 Engineering Services	$3,489,423	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
74	University of North Carolina at Chapel Hill 3 awardees, including North Carolina State University Top NAICS codes 519120 Libraries and Archives 541511 Custom Computer Programming Services 541620 Environmental Consulting Services	$3,461,888	0.2%	Rank history: #91 in FY2022, #94 in FY2023 and not on the FY2024–FY2025 lists; up 258 since FY2020.
75	S C & A Inc. 2 awardees, including EC / R Incorporated Top NAICS codes 541620 Environmental Consulting Services	$3,417,763	0.2%	Rank history: #85 in FY2022, #67 in FY2023, #20 in FY2024 and #15 in FY2025; up 14 since FY2020.
76	Bvspc - Envirocon JV Top NAICS codes 562910 Remediation Services	$3,347,189	0.2%	Rank history: not on the FY2022–FY2025 lists; down 43 since FY2020.
77	Data Systems Analysts Inc. Through Project Performance Company, LLC Top NAICS codes 541519 Other Computer Related Services	$3,301,252	0.2%	Rank history: #58 in FY2022, #83 in FY2023, #62 in FY2024 and #75 in FY2025; down 3 since FY2020.
78	Information International Associates Inc. 2 awardees, including Keylogic, LLC and Keylogic Associates, Inc. Top NAICS codes 541511 Custom Computer Programming Services 541519 Other Computer Related Services	$3,276,251	0.2%	Rank history: #87 in FY2022, #73 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
79	Cartridge Technologies, LLC Top NAICS codes 811212 Computer and Office Machine Repair and Maintenance	$3,256,236	0.2%	Rank history: not on the FY2022–FY2025 lists; up 44 since FY2020.
80	MPF Federal, LLC Top NAICS codes 561210 Facilities Support Services 541990 All Other Professional, Scientific, and Technical Services 541940 Veterinary Services	$3,212,619	0.2%	Rank history: #73 in FY2022, #82 in FY2023, #96 in FY2024 and not on the FY2025 list; up 31 since FY2020.
81	Louis Berger U.S. Inc. 3 awardees, including WSP USA Solutions Inc. and Ecology and Environment Inc. Top NAICS codes 541330 Engineering Services	$3,189,639	0.2%	Rank history: not on the FY2022–FY2025 lists; down 5 since FY2020.
82	State of California Controllers Office 3 awardees, including University of California, Davis and San Diego State University Foundation Top NAICS codes 541380 Testing Laboratories and Services 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology) 541620 Environmental Consulting Services	$3,181,213	0.2%	Rank history: not on the FY2022 list, #72 in FY2023 and not on the FY2024–FY2025 lists; up 66 since FY2020.
83	Indigo IT, LLC Top NAICS codes 541513 Computer Facilities Management Services	$3,147,065	0.2%	Rank history: #81 in FY2022 and not on the FY2023–FY2025 lists; down 21 since FY2020.
84	Comptech Computer Technologies, Inc. Top NAICS codes 541519 Other Computer Related Services	$3,143,016	0.2%	Rank history: not on the FY2022 list, #79 in FY2023, #73 in FY2024 and #62 in FY2025; up 68 since FY2020.
85	Driven Contractors LLC Top NAICS codes 236220 Commercial and Institutional Building Construction	$3,044,805	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
86	Customer Value Partners, LLC Top NAICS codes 541512 Computer Systems Design Services	$3,040,446	0.2%	Rank history: #77 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
87	Sikich Federal Inc. Top NAICS codes 541512 Computer Systems Design Services	$2,991,153	0.2%	Rank history: #74 in FY2022 and not on the FY2023–FY2025 lists; up 126 since FY2020.
88	Verizon Communications Inc. 2 awardees, including Cellco Partnership Top NAICS codes 541519 Other Computer Related Services	$2,920,589	0.2%	Rank history: #94 in FY2022, #93 in FY2023 and not on the FY2024–FY2025 lists; up 71 since FY2020.
89	Thomas Scientific LLC 2 awardees, including Unison Software Inc. Top NAICS codes 443120 Computer and Software Stores 511210 Software Publishers 334516 Analytical Laboratory Instrument Manufacturing	$2,824,098	0.2%	Rank history: #97 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
90	B&V E&E JV Top NAICS codes 562910 Remediation Services	$2,815,009	0.2%	Rank history: #90 in FY2022 and not on the FY2023–FY2025 lists; up 97 since FY2020.
91	Servicesource Inc. Top NAICS codes 561499 All Other Business Support Services 493190 Other Warehousing and Storage	$2,768,354	0.2%	Rank history: not on the FY2022–FY2025 lists; up 4 since FY2020.
92	Fcn, Inc. Top NAICS codes 541519 Other Computer Related Services	$2,762,881	0.2%	Rank history: not on the FY2022–FY2025 lists; up 25 since FY2020.
93	ST George Tanaq Corp Through Heliotech Top NAICS codes 562910 Remediation Services	$2,750,581	0.2%	Rank history: not on the FY2022 list, #87 in FY2023 and not on the FY2024–FY2025 lists; up 93 since FY2020.
94	The HP Group LLC Through United Federal Facility Services, LLC Top NAICS codes 561210 Facilities Support Services	$2,697,462	0.2%	Rank history: not on the FY2022–FY2025 lists; up 89 since FY2020.
95	Redhorse Corporation Top NAICS codes 561210 Facilities Support Services 562910 Remediation Services	$2,662,156	0.2%	Rank history: not on the FY2022–FY2025 lists; up 9 since FY2020.
96	Ajanta Consulting LLC Top NAICS codes 561210 Facilities Support Services	$2,620,438	0.2%	Rank history: not on the FY2022–FY2025 lists; up 6 since FY2020.
97	Veterans Worldwide Sales & Services, LLC Top NAICS codes 562910 Remediation Services	$2,530,323	0.1%	Rank history: not on the FY2022–FY2025 lists; down 53 since FY2020.
98	Gartner, Inc. Top NAICS codes 541690 Other Scientific and Technical Consulting Services 541620 Environmental Consulting Services 541519 Other Computer Related Services	$2,524,265	0.1%	Rank history: #95 in FY2022, #66 in FY2023 and not on the FY2024–FY2025 lists; up 7 since FY2020.
99	TRC Companies, Inc. 2 awardees, including TRC Environmental Corp Top NAICS codes 541330 Engineering Services	$2,498,095	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
100	Urban Services Group Inc. Top NAICS codes 561210 Facilities Support Services	$2,483,114	0.1%	Rank history: not on the FY2022–FY2025 lists; down 22 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 $1.71 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.

Quick answers