Top 100 Environmental Protection Agency Contractors, FY2024

Full ranking

Rank	Contractor	Net obligations	Share	Trend
1	Sevenson Environmental Services, Inc. Top NAICS codes 562910 Remediation Services	$351,388,689	10.9%	Rank history: #14 in FY2021, #13 in FY2022, #19 in FY2023 and #1 in FY2025; up 18 since FY2023.
2	General Dynamics Corporation 3 awardees, including General Dynamics Information Technology, Inc. Top NAICS codes 541512 Computer Systems Design Services 541620 Environmental Consulting Services 541519 Other Computer Related Services	$197,531,447	6.1%	Rank history: #1 in FY2021, #3 in FY2022, #1 in FY2023 and #2 in FY2025; down 1 since FY2023.
3	EA Engineering Science and Technology Inc. PBC 2 awardees Top NAICS codes 562910 Remediation Services 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology)	$178,692,913	5.5%	Rank history: #5 in FY2021, #1 in FY2022, #3 in FY2023 and #7 in FY2025; unchanged since FY2023.
4	Eastern Research Group Inc. Top NAICS codes 541620 Environmental Consulting Services 541611 Administrative Management and General Management Consulting Services 541380 Testing Laboratories and Services	$118,751,855	3.7%	Rank history: #7 in FY2021, #6 in FY2022, #7 in FY2023 and #8 in FY2025; up 3 since FY2023.
5	Tetra Tech, Inc. 11 awardees, including Bluewater Federal Solutions, Inc. Top NAICS codes 541620 Environmental Consulting Services 562910 Remediation Services 541330 Engineering Services	$100,207,515	3.1%	Rank history: #4 in FY2021, #4 in FY2022, #2 in FY2023 and #9 in FY2025; down 3 since FY2023.
6	Hydrogeologic, Inc. Top NAICS codes 562910 Remediation Services	$93,184,796	2.9%	Rank history: #15 in FY2021, #15 in FY2022, #9 in FY2023 and #11 in FY2025; up 3 since FY2023.
7	Kemron Environmental Services Inc. 2 awardees, including Kemron / Arrowhead JV, LLC Top NAICS codes 562910 Remediation Services	$91,567,973	2.8%	Rank history: not on the FY2021–FY2023 lists and #18 in FY2025; up 274 since FY2023.
8	AECOM Technical Services, Inc. Top NAICS codes 562910 Remediation Services 541330 Engineering Services	$78,124,774	2.4%	Rank history: not on the FY2021–FY2023 lists and #17 in FY2025; new.
9	Environmental Restoration LLC Top NAICS codes 562910 Remediation Services	$70,624,981	2.2%	Rank history: #2 in FY2021, #2 in FY2022, #5 in FY2023 and #4 in FY2025; down 4 since FY2023.
10	Leisnoi Diversified-Kemron 8A JV, LLC Top NAICS codes 562910 Remediation Services	$66,216,484	2.0%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
11	Ch2M Hill, Inc. Top NAICS codes 562910 Remediation Services	$55,017,628	1.7%	Rank history: #62 in FY2021, #17 in FY2022, #100 in FY2023 and #14 in FY2025; up 89 since FY2023.
12	The Cadmus Group LLC Top NAICS codes 541620 Environmental Consulting Services 541611 Administrative Management and General Management Consulting Services	$45,878,209	1.4%	Rank history: #34 in FY2021, #32 in FY2022, #28 in FY2023 and #34 in FY2025; up 16 since FY2023.
13	Salient Crgt, Inc. Top NAICS codes 541512 Computer Systems Design Services	$44,900,000	1.4%	Rank history: not on the FY2021–FY2022 lists, #31 in FY2023 and #6 in FY2025; up 18 since FY2023.
14	CDM Federal Programs Corporation Top NAICS codes 562910 Remediation Services 541620 Environmental Consulting Services	$40,999,240	1.3%	Rank history: not on the FY2021–FY2022 lists, #54 in FY2023 and #12 in FY2025; up 40 since FY2023.
15	Endyna, Inc. Top NAICS codes 541611 Administrative Management and General Management Consulting Services	$38,854,046	1.2%	Rank history: not on the FY2021–FY2023 lists and #13 in FY2025; up 151 since FY2023.
16	Semanticbits LLC Through ICF Incorporated, L.L.C. Top NAICS codes 541611 Administrative Management and General Management Consulting Services 541620 Environmental Consulting Services 541380 Testing Laboratories and Services	$37,255,566	1.2%	Rank history: not on the FY2021–FY2023 lists and #24 in FY2025; new.
17	Advanced Technology Systems Inc. Through Salient Crgt, Inc. Top NAICS codes 541512 Computer Systems Design Services	$36,122,971	1.1%	Rank history: not on the FY2021 list, #24 in FY2022, #12 in FY2023 and not on the FY2025 list; down 5 since FY2023.
18	Research Triangle Institute Top NAICS codes 541620 Environmental Consulting Services 541611 Administrative Management and General Management Consulting Services 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology)	$35,529,338	1.1%	Rank history: #18 in FY2021, #20 in FY2022, #16 in FY2023 and #20 in FY2025; down 2 since FY2023.
19	Weston Solutions Holdings, Inc. 3 awardees, including Weston Solutions Inc. Top NAICS codes 541620 Environmental Consulting Services	$35,321,438	1.1%	Rank history: #20 in FY2021, #12 in FY2022, #18 in FY2023 and #5 in FY2025; down 1 since FY2023.
20	S C & A Inc. Top NAICS codes 541620 Environmental Consulting Services	$33,267,390	1.0%	Rank history: #75 in FY2021, #85 in FY2022, #67 in FY2023 and #15 in FY2025; up 47 since FY2023.
21	Guidehouse Inc. Through Aptim Federal Services, LLC Top NAICS codes 562910 Remediation Services 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology) 541380 Testing Laboratories and Services	$32,859,234	1.0%	Rank history: not on the FY2021–FY2023 lists and #37 in FY2025; new.
22	EQ & CH Remediation Top NAICS codes 562910 Remediation Services	$32,786,469	1.0%	Rank history: #30 in FY2021, #39 in FY2022, #38 in FY2023 and not on the FY2025 list; up 16 since FY2023.
23	C M C, Inc. Top NAICS codes 562910 Remediation Services	$29,861,520	0.9%	Rank history: #32 in FY2021, #16 in FY2022, #13 in FY2023 and #51 in FY2025; down 10 since FY2023.
24	ICF International, Inc. Through ICF Incorporated, L.L.C. Top NAICS codes 541611 Administrative Management and General Management Consulting Services 541620 Environmental Consulting Services 541990 All Other Professional, Scientific, and Technical Services	$28,490,688	0.9%	Rank history: #9 in FY2021, #10 in FY2022, #10 in FY2023 and not on the FY2025 list; down 14 since FY2023.
25	CGI Technologies and Solutions Inc. Through CGI Federal Inc. Top NAICS codes 541512 Computer Systems Design Services 541519 Other Computer Related Services 518210 Computing Infrastructure Providers, Data Processing, Web Hosting, and Related Services	$28,402,484	0.9%	Rank history: #8 in FY2021, #8 in FY2022, #14 in FY2023 and not on the FY2025 list; down 11 since FY2023.
26	J.f. Brennan Company, Inc. Top NAICS codes 562910 Remediation Services	$26,534,443	0.8%	Rank history: not on the FY2021 list, #5 in FY2022, #78 in FY2023 and #85 in FY2025; up 52 since FY2023.
27	Environmental Quality Management, Inc. Top NAICS codes 562910 Remediation Services	$26,304,277	0.8%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
28	Booz Allen Hamilton Holding Corporation Through Booz Allen Hamilton Inc. Top NAICS codes 541512 Computer Systems Design Services 541511 Custom Computer Programming Services 541620 Environmental Consulting Services	$25,436,520	0.8%	Rank history: #17 in FY2021, #23 in FY2022, #24 in FY2023 and #28 in FY2025; down 4 since FY2023.
29	CGI Federal Inc. Top NAICS codes 541512 Computer Systems Design Services 518210 Computing Infrastructure Providers, Data Processing, Web Hosting, and Related Services 541519 Other Computer Related Services	$25,358,013	0.8%	Rank history: not on the FY2021–FY2023 lists and #10 in FY2025; new.
30	Alliance for Energy Innovation, LLC Top NAICS codes 541711 Research and Development in Biotechnology	$24,000,000	0.7%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
31	Conti Federal Services, LLC Top NAICS codes 562910 Remediation Services	$23,992,770	0.7%	Rank history: not on the FY2021–FY2023 lists and #19 in FY2025; new.
32	Science Applications International Corporation 2 awardees Top NAICS codes 541512 Computer Systems Design Services 541620 Environmental Consulting Services	$22,000,735	0.7%	Rank history: #3 in FY2021, #7 in FY2022, #58 in FY2023 and #32 in FY2025; up 26 since FY2023.
33	OCH JV Top NAICS codes 562910 Remediation Services	$21,889,138	0.7%	Rank history: #58 in FY2021, not on the FY2022–FY2023 lists and not on the FY2025 list; returned.
34	Nobis Engineering, Inc. Top NAICS codes 562910 Remediation Services	$21,358,393	0.7%	Rank history: #31 in FY2021, #33 in FY2022, #95 in FY2023 and not on the FY2025 list; up 61 since FY2023.
35	Agile Decision Sciences, LLC Top NAICS codes 541990 All Other Professional, Scientific, and Technical Services	$20,111,628	0.6%	Rank history: not on the FY2021–FY2022 lists, #23 in FY2023 and not on the FY2025 list; down 12 since FY2023.
36	Arctic Slope Regional Corporation 4 awardees, including Environmental Quality Management, Inc., Asrc Federal Data Network Technologies, LLC and EQM Services, LLC Top NAICS codes 562910 Remediation Services 541512 Computer Systems Design Services	$19,994,674	0.6%	Rank history: #12 in FY2021, #44 in FY2022, #8 in FY2023 and #3 in FY2025; down 28 since FY2023.
37	Jacobs Government Services Company 4 awardees, including Amentum Technology, Inc. and Jacobs Engineering Group Inc. Top NAICS codes 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology) 562910 Remediation Services 541330 Engineering Services	$18,775,448	0.6%	Rank history: not on the FY2021–FY2023 lists and #16 in FY2025; new.
38	Dell Technologies Inc. Through Dell Federal Systems L.P Top NAICS codes 511210 Software Publishers	$18,677,035	0.6%	Rank history: not on the FY2021–FY2023 lists and #23 in FY2025; new.
39	Techlaw Holdings Inc. 2 awardees, including Techlaw Consultants Inc. Top NAICS codes 562910 Remediation Services 541380 Testing Laboratories and Services	$15,707,851	0.5%	Rank history: not on the FY2021–FY2023 lists and #47 in FY2025; new.
40	Firelake-Diversified JV2 LLC Top NAICS codes 236220 Commercial and Institutional Building Construction	$15,252,951	0.5%	Rank history: not on the FY2021–FY2022 lists, #36 in FY2023 and not on the FY2025 list; down 4 since FY2023.
41	Leisnoi Diversified Services, LLC Top NAICS codes 562910 Remediation Services	$15,072,269	0.5%	Rank history: #35 in FY2021, #35 in FY2022, #45 in FY2023 and #43 in FY2025; up 4 since FY2023.
42	Systalex Corporation Top NAICS codes 541519 Other Computer Related Services	$14,345,964	0.4%	Rank history: #43 in FY2021, #49 in FY2022, #49 in FY2023 and #41 in FY2025; up 7 since FY2023.
43	Skeo Solutions, Inc. Top NAICS codes 541620 Environmental Consulting Services	$14,074,259	0.4%	Rank history: #72 in FY2021, #26 in FY2022, #33 in FY2023 and #69 in FY2025; down 10 since FY2023.
44	Oak Ridge Associated Universities, Incorporated Top NAICS codes 541990 All Other Professional, Scientific, and Technical Services	$13,978,640	0.4%	Rank history: #28 in FY2021, #30 in FY2022, #26 in FY2023 and not on the FY2025 list; down 18 since FY2023.
45	Valiant Solutions LLC Top NAICS codes 541512 Computer Systems Design Services	$13,707,136	0.4%	Rank history: not on the FY2021–FY2023 lists and #27 in FY2025; new.
46	Weston-Techlaw JV LLC Top NAICS codes 541620 Environmental Consulting Services	$13,298,219	0.4%	Rank history: not on the FY2021 list, #52 in FY2022, #30 in FY2023 and #36 in FY2025; down 16 since FY2023.
47	Datawiz Corporation Top NAICS codes 541519 Other Computer Related Services	$12,326,234	0.4%	Rank history: not on the FY2021–FY2022 lists, #32 in FY2023 and not on the FY2025 list; down 15 since FY2023.
48	Paragon Professional Services LLC Top NAICS codes 562910 Remediation Services	$12,070,670	0.4%	Rank history: not on the FY2021–FY2022 lists, #37 in FY2023 and #21 in FY2025; down 11 since FY2023.
49	Environmental Chemical Corporation Through ECC Environmental LLC Top NAICS codes 562910 Remediation Services	$11,972,861	0.4%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
50	EQM Services, LLC Top NAICS codes 562910 Remediation Services	$11,666,554	0.4%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
51	ABT Global LLC Top NAICS codes 541611 Administrative Management and General Management Consulting Services 541620 Environmental Consulting Services	$11,651,237	0.4%	Rank history: not on the FY2021–FY2023 lists and #33 in FY2025; new.
52	Chenega It Enterprise Services, LLC Top NAICS codes 518210 Computing Infrastructure Providers, Data Processing, Web Hosting, and Related Services	$11,394,953	0.4%	Rank history: #22 in FY2021, #51 in FY2022, #60 in FY2023 and #35 in FY2025; up 8 since FY2023.
53	Cape Remediation, LLC Top NAICS codes 562910 Remediation Services	$11,178,533	0.3%	Rank history: not on the FY2021–FY2022 lists, #17 in FY2023 and #49 in FY2025; down 36 since FY2023.
54	Patriot LLC Top NAICS codes 541512 Computer Systems Design Services	$10,581,379	0.3%	Rank history: #36 in FY2021, #29 in FY2022, #43 in FY2023 and #94 in FY2025; down 11 since FY2023.
55	MCP Computer Products Inc. Top NAICS codes 334111 Electronic Computer Manufacturing	$10,374,570	0.3%	Rank history: #27 in FY2021, #37 in FY2022, #35 in FY2023 and #42 in FY2025; down 20 since FY2023.
56	Environmental Systems Research Institute, Inc. 2 awardees Top NAICS codes 511210 Software Publishers 518210 Computing Infrastructure Providers, Data Processing, Web Hosting, and Related Services	$9,699,738	0.3%	Rank history: not on the FY2021–FY2023 lists and #66 in FY2025; new.
57	M.c. Dean, Inc. Top NAICS codes 541330 Engineering Services	$9,511,246	0.3%	Rank history: #50 in FY2021, #64 in FY2022, #69 in FY2023 and #63 in FY2025; up 12 since FY2023.
58	Great Lakes Environmental Center, Inc. Top NAICS codes 541620 Environmental Consulting Services 541380 Testing Laboratories and Services	$9,130,400	0.3%	Rank history: #70 in FY2021, #48 in FY2022, #47 in FY2023 and #64 in FY2025; down 11 since FY2023.
59	CDM Smith Inc Through CDM Federal Programs Corporation Top NAICS codes 562910 Remediation Services 541620 Environmental Consulting Services	$9,117,173	0.3%	Rank history: not on the FY2021–FY2022 lists, #11 in FY2023 and not on the FY2025 list; down 48 since FY2023.
60	A and M Engineering & Environmental Services, Inc. Top NAICS codes 562910 Remediation Services	$8,602,459	0.3%	Rank history: #42 in FY2021, #47 in FY2022, not on the FY2023 list and #44 in FY2025; returned.
61	SRC Inc. Top NAICS codes 541620 Environmental Consulting Services 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology)	$8,587,605	0.3%	Rank history: #37 in FY2021, #46 in FY2022, #51 in FY2023 and #76 in FY2025; down 10 since FY2023.
62	Data Systems Analysts Inc. 2 awardees, including Project Performance Company, LLC Top NAICS codes 541512 Computer Systems Design Services 541519 Other Computer Related Services	$7,657,382	0.2%	Rank history: #77 in FY2021, #58 in FY2022, #83 in FY2023 and #75 in FY2025; up 21 since FY2023.
63	Battelle Memorial Institute 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 541620 Environmental Consulting Services	$7,228,447	0.2%	Rank history: #44 in FY2021, #56 in FY2022, #63 in FY2023 and #78 in FY2025; unchanged since FY2023.
64	WSP USA Environment & Infrastructure Inc. Top NAICS codes 541620 Environmental Consulting Services 561210 Facilities Support Services	$7,093,826	0.2%	Rank history: not on the FY2021 list, #84 in FY2022, not on the FY2023 list and #26 in FY2025; up 41 since FY2023.
65	Pegasus Technical Services, Inc. Top NAICS codes 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology)	$6,991,914	0.2%	Rank history: #45 in FY2021, #57 in FY2022, #55 in FY2023 and #60 in FY2025; down 10 since FY2023.
66	Centennial Technologies Inc Top NAICS codes 541611 Administrative Management and General Management Consulting Services	$6,950,266	0.2%	Rank history: not on the FY2021–FY2023 lists and #65 in FY2025; up 42 since FY2023.
67	Deloitte 2 awardees, including Deloitte Consulting LLP and Deloitte Financial Advisory Services LLP Top NAICS codes 541611 Administrative Management and General Management Consulting Services	$6,660,122	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
68	Wood Environment & Infrastructure Solutions Inc. Through WSP USA Environment & Infrastructure Inc. Top NAICS codes 541620 Environmental Consulting Services 561210 Facilities Support Services	$6,547,335	0.2%	Rank history: #26 in FY2021, #78 in FY2022, #41 in FY2023 and not on the FY2025 list; down 27 since FY2023.
69	Joyce Coffee Consulting LLC Top NAICS codes 541620 Environmental Consulting Services	$5,985,163	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; up 245 since FY2023.
70	Hdr, Inc. 2 awardees, including HDR Aptim LLC and Hdr-Obg A Joint Venture Top NAICS codes 562910 Remediation Services 541330 Engineering Services	$5,735,414	0.2%	Rank history: #38 in FY2021, #28 in FY2022, #29 in FY2023 and #40 in FY2025; down 41 since FY2023.
71	Cardinal Point Captains Inc Top NAICS codes 483114 Coastal and Great Lakes Passenger Transportation	$5,724,000	0.2%	Rank history: not on the FY2021–FY2023 lists and #48 in FY2025; new.
72	Avanti Corporation Top NAICS codes 541620 Environmental Consulting Services	$5,566,242	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; up 100 since FY2023.
73	Comptech Computer Technologies, Inc. Top NAICS codes 541519 Other Computer Related Services	$5,341,108	0.2%	Rank history: #84 in FY2021, not on the FY2022 list, #79 in FY2023 and #62 in FY2025; up 6 since FY2023.
74	Jacobs Engineering Group Inc. 5 awardees, including Amentum Technology, Inc. and Ch2M Hill, Inc. Top NAICS codes 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology) 562910 Remediation Services 541330 Engineering Services	$5,305,156	0.2%	Rank history: #6 in FY2021, #14 in FY2022, #6 in FY2023 and not on the FY2025 list; down 68 since FY2023.
75	Leisnoi-Kemron 8A JV, LLC Top NAICS codes 562910 Remediation Services	$5,180,657	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
76	Arrowhead Contracting, LLC Top NAICS codes 562910 Remediation Services	$5,168,345	0.2%	Rank history: not on the FY2021–FY2022 lists, #20 in FY2023 and #25 in FY2025; down 56 since FY2023.
77	Specpro-Ayuda JV, LLC Top NAICS codes 562910 Remediation Services	$5,118,782	0.2%	Rank history: not on the FY2021–FY2022 lists, #71 in FY2023 and not on the FY2025 list; down 6 since FY2023.
78	AECOM 3 awardees, including URS Group, Inc. and AECOM Technical Services, Inc. Top NAICS codes 562910 Remediation Services 541330 Engineering Services	$5,102,022	0.2%	Rank history: #23 in FY2021, #11 in FY2022, #4 in FY2023 and #84 in FY2025; down 74 since FY2023.
79	Nana Regional Corporation Inc. Through Affigent, LLC Top NAICS codes 541519 Other Computer Related Services	$5,096,493	0.2%	Rank history: not on the FY2021–FY2023 lists and #71 in FY2025; new.
80	Arcadis U.s., Inc. Top NAICS codes 541330 Engineering Services	$5,088,986	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
81	Versar-Wsp JV Top NAICS codes 562910 Remediation Services	$4,840,280	0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; up 42 since FY2023.
82	Plateau Software, Inc. Top NAICS codes 541511 Custom Computer Programming Services 541513 Computer Facilities Management Services	$4,828,782	0.1%	Rank history: not on the FY2021–FY2022 lists, #90 in FY2023 and not on the FY2025 list; up 8 since FY2023.
83	Migo-A&M-Haemers JV Top NAICS codes 562910 Remediation Services	$4,816,051	0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
84	Horsley Witten Group, Inc. Top NAICS codes 541620 Environmental Consulting Services	$4,566,859	0.1%	Rank history: #56 in FY2021, #100 in FY2022, #86 in FY2023 and not on the FY2025 list; up 2 since FY2023.
85	HDR Aptim LLC Top NAICS codes 562910 Remediation Services	$4,552,165	0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
86	VMD Systems Integrators Inc Top NAICS codes 541512 Computer Systems Design Services	$4,537,035	0.1%	Rank history: not on the FY2021–FY2023 lists and #82 in FY2025; up 42 since FY2023.
87	Aleut Technical Services, LLC Top NAICS codes 541620 Environmental Consulting Services	$4,371,915	0.1%	Rank history: not on the FY2021–FY2022 lists, #99 in FY2023 and #98 in FY2025; up 12 since FY2023.
88	Toeroek Associates, Inc. Top NAICS codes 541620 Environmental Consulting Services 562910 Remediation Services	$4,347,449	0.1%	Rank history: #59 in FY2021, #41 in FY2022, #42 in FY2023 and #72 in FY2025; down 46 since FY2023.
89	Golder Europe Service Centre SRL 2 awardees, including WSP USA Solutions Inc. Top NAICS codes 541330 Engineering Services	$4,341,390	0.1%	Rank history: not on the FY2021–FY2023 lists and #30 in FY2025; new.
90	Duke Energy Corporation Through Duke Energy Progress, LLC Top NAICS codes 221122 Electric Power Distribution	$4,330,833	0.1%	Rank history: #64 in FY2021, #88 in FY2022, #96 in FY2023 and not on the FY2025 list; up 6 since FY2023.
91	Diversified Protection Corp Top NAICS codes 561612 Security Guards and Patrol Services	$4,275,087	0.1%	Rank history: #60 in FY2021, #75 in FY2022, #84 in FY2023 and #86 in FY2025; down 7 since FY2023.
92	WSP USA Solutions Inc. Top NAICS codes 541330 Engineering Services	$4,239,001	0.1%	Rank history: not on the FY2021 list, #34 in FY2022, #70 in FY2023 and not on the FY2025 list; down 22 since FY2023.
93	Environmental Management Support, Inc. Top NAICS codes 541620 Environmental Consulting Services	$4,235,567	0.1%	Rank history: #71 in FY2021, #99 in FY2022, #92 in FY2023 and #68 in FY2025; down 1 since FY2023.
94	Owl Ayuda 8A JV LLC Top NAICS codes 562910 Remediation Services	$4,143,432	0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
95	Consolidated Safety Services Incorporated 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	$4,105,370	0.1%	Rank history: #53 in FY2021, #65 in FY2022, #61 in FY2023 and #45 in FY2025; down 34 since FY2023.
96	MPF Federal, LLC Top NAICS codes 541940 Veterinary Services 541990 All Other Professional, Scientific, and Technical Services	$3,927,903	0.1%	Rank history: #80 in FY2021, #73 in FY2022, #82 in FY2023 and not on the FY2025 list; down 14 since FY2023.
97	Wilson 5 Service Company, Inc. Top NAICS codes 561210 Facilities Support Services	$3,863,639	0.1%	Rank history: not on the FY2021–FY2022 lists, #97 in FY2023 and #90 in FY2025; unchanged since FY2023.
98	University of North Carolina At Chapel Hill Top NAICS codes 541620 Environmental Consulting Services 519120 Libraries and Archives 541618 Other Management Consulting Services	$3,834,373	0.1%	Rank history: not on the FY2021–FY2023 lists and #77 in FY2025; up 40 since FY2023.
99	Heliotech 2 awardees Top NAICS codes 562910 Remediation Services	$3,792,579	0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
100	Arlluk Technology Solutions LLC Top NAICS codes 541511 Custom Computer Programming Services	$3,756,444	0.1%	Rank history: not on the FY2021–FY2023 lists and #74 in FY2025; new.

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 $3.24 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 2024 ran Oct 1, 2023 – Sep 30, 2024. 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 FY2023. "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 FY2023 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