Top 100 Environmental Protection Agency Contractors, FY2025

Full ranking

Rank	Contractor	Net obligations	Share	Trend
1	Sevenson Environmental Services, Inc. Top NAICS codes 562910 Remediation Services	$164,575,973	6.9%	Rank history: #14 in FY2021, #13 in FY2022, #19 in FY2023 and #1 in FY2024; unchanged since FY2024.
2	General Dynamics Corporation 2 awardees, including General Dynamics Information Technology, Inc. and General Dynamics Mission Systems, Inc. Top NAICS codes 541512 Computer Systems Design Services 541611 Administrative Management and General Management Consulting Services 541620 Environmental Consulting Services	$158,954,798	6.6%	Rank history: #1 in FY2021, #3 in FY2022, #1 in FY2023 and #2 in FY2024; unchanged since FY2024.
3	Arctic Slope Regional Corporation 4 awardees, including Environmental Quality Management, Inc., Agile Decision Sciences, LLC and Asrc Federal Data Network Technologies, LLC Top NAICS codes 562910 Remediation Services 541990 All Other Professional, Scientific, and Technical Services 541512 Computer Systems Design Services	$158,449,477	6.6%	Rank history: #12 in FY2021, #44 in FY2022, #8 in FY2023 and #36 in FY2024; up 33 since FY2024.
4	Environmental Restoration LLC Top NAICS codes 562910 Remediation Services	$115,536,791	4.8%	Rank history: #2 in FY2021, #2 in FY2022, #5 in FY2023 and #9 in FY2024; up 5 since FY2024.
5	Weston Solutions Holdings, Inc. 3 awardees, including Weston Solutions Inc. Top NAICS codes 541620 Environmental Consulting Services	$85,747,920	3.6%	Rank history: #20 in FY2021, #12 in FY2022, #18 in FY2023 and #19 in FY2024; up 14 since FY2024.
6	Salient Crgt, Inc. Top NAICS codes 541512 Computer Systems Design Services	$77,005,000	3.2%	Rank history: not on the FY2021–FY2022 lists, #31 in FY2023 and #13 in FY2024; up 7 since FY2024.
7	EA Engineering Science and Technology Inc. PBC Top NAICS codes 562910 Remediation Services 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology)	$74,662,391	3.1%	Rank history: #5 in FY2021, #1 in FY2022, #3 in FY2023 and #3 in FY2024; down 4 since FY2024.
8	Eastern Research Group Inc. Top NAICS codes 541620 Environmental Consulting Services 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology) 541380 Testing Laboratories and Services	$66,591,480	2.8%	Rank history: #7 in FY2021, #6 in FY2022, #7 in FY2023 and #4 in FY2024; down 4 since FY2024.
9	Tetra Tech, Inc. 10 awardees Top NAICS codes 541620 Environmental Consulting Services 541330 Engineering Services 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology)	$65,321,282	2.7%	Rank history: #4 in FY2021, #4 in FY2022, #2 in FY2023 and #5 in FY2024; down 4 since FY2024.
10	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	$61,590,317	2.6%	Rank history: not on the FY2021–FY2023 lists and #29 in FY2024; up 19 since FY2024.
11	Hydrogeologic, Inc. Top NAICS codes 562910 Remediation Services 541330 Engineering Services	$47,225,047	2.0%	Rank history: #15 in FY2021, #15 in FY2022, #9 in FY2023 and #6 in FY2024; down 5 since FY2024.
12	CDM Federal Programs Corporation 2 awardees Top NAICS codes 562910 Remediation Services 541330 Engineering Services 541620 Environmental Consulting Services	$39,603,318	1.6%	Rank history: not on the FY2021–FY2022 lists, #54 in FY2023 and #14 in FY2024; up 2 since FY2024.
13	Endyna, Inc. Top NAICS codes 541611 Administrative Management and General Management Consulting Services 541620 Environmental Consulting Services	$38,422,336	1.6%	Rank history: not on the FY2021–FY2023 lists and #15 in FY2024; up 2 since FY2024.
14	Ch2M Hill, Inc. Top NAICS codes 562910 Remediation Services	$34,120,921	1.4%	Rank history: #62 in FY2021, #17 in FY2022, #100 in FY2023 and #11 in FY2024; down 3 since FY2024.
15	S C & A Inc. Top NAICS codes 541620 Environmental Consulting Services	$31,114,204	1.3%	Rank history: #75 in FY2021, #85 in FY2022, #67 in FY2023 and #20 in FY2024; up 5 since FY2024.
16	Jacobs Government Services Company 3 awardees, including Jacobs Engineering Group Inc. and Amentum Technology, Inc. Top NAICS codes 562910 Remediation Services 541330 Engineering Services 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology)	$30,100,955	1.3%	Rank history: not on the FY2021–FY2023 lists and #37 in FY2024; up 21 since FY2024.
17	AECOM Technical Services, Inc. Top NAICS codes 562910 Remediation Services 541330 Engineering Services	$29,500,066	1.2%	Rank history: not on the FY2021–FY2023 lists and #8 in FY2024; down 9 since FY2024.
18	Kemron Environmental Services Inc. 2 awardees, including Kemron / Arrowhead JV, LLC Top NAICS codes 562910 Remediation Services	$28,922,181	1.2%	Rank history: not on the FY2021–FY2023 lists and #7 in FY2024; down 11 since FY2024.
19	Conti Federal Services, LLC Top NAICS codes 562910 Remediation Services	$25,535,523	1.1%	Rank history: not on the FY2021–FY2023 lists and #31 in FY2024; up 12 since FY2024.
20	Research Triangle Institute Top NAICS codes 541611 Administrative Management and General Management Consulting Services 541620 Environmental Consulting Services 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology)	$23,580,963	1.0%	Rank history: #18 in FY2021, #20 in FY2022, #16 in FY2023 and #18 in FY2024; down 2 since FY2024.
21	Paragon Professional Services LLC 2 awardees Top NAICS codes 562910 Remediation Services	$21,559,235	0.9%	Rank history: not on the FY2021–FY2022 lists, #37 in FY2023 and #48 in FY2024; up 27 since FY2024.
22	Ahtna-Brennan JV, LLC Top NAICS codes 562910 Remediation Services	$21,315,304	0.9%	Rank history: not on the FY2021–FY2024 lists; new.
23	Dell Technologies Inc. 2 awardees, including Dell Federal Systems L.P Top NAICS codes 511210 Software Publishers	$19,855,978	0.8%	Rank history: not on the FY2021–FY2023 lists and #38 in FY2024; up 15 since FY2024.
24	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	$17,969,966	0.7%	Rank history: not on the FY2021–FY2023 lists and #16 in FY2024; down 8 since FY2024.
25	Arrowhead Contracting, LLC Top NAICS codes 562910 Remediation Services	$17,181,032	0.7%	Rank history: not on the FY2021–FY2022 lists, #20 in FY2023 and #76 in FY2024; up 51 since FY2024.
26	WSP USA Environment & Infrastructure Inc. Top NAICS codes 541620 Environmental Consulting Services 561210 Facilities Support Services	$17,127,707	0.7%	Rank history: not on the FY2021 list, #84 in FY2022, not on the FY2023 list and #64 in FY2024; up 38 since FY2024.
27	Valiant Solutions LLC Top NAICS codes 541512 Computer Systems Design Services	$16,819,244	0.7%	Rank history: not on the FY2021–FY2023 lists and #45 in FY2024; up 18 since FY2024.
28	Booz Allen Hamilton Holding Corporation Through Booz Allen Hamilton Inc. Top NAICS codes 541512 Computer Systems Design Services 541511 Custom Computer Programming Services 541611 Administrative Management and General Management Consulting Services	$16,595,257	0.7%	Rank history: #17 in FY2021, #23 in FY2022, #24 in FY2023 and #28 in FY2024; unchanged since FY2024.
29	ECC Environmental LLC Top NAICS codes 562910 Remediation Services	$15,493,981	0.6%	Rank history: not on the FY2021–FY2024 lists; new.
30	Golder Europe Service Centre SRL Through WSP USA Solutions Inc. Top NAICS codes 541330 Engineering Services	$14,295,643	0.6%	Rank history: not on the FY2021–FY2023 lists and #89 in FY2024; up 59 since FY2024.
31	MRIGLOBAL Top NAICS codes 336211 Motor Vehicle Body Manufacturing	$13,038,279	0.5%	Rank history: not on the FY2021–FY2024 lists; new.
32	Science Applications International Corporation Top NAICS codes 541512 Computer Systems Design Services 541620 Environmental Consulting Services 541611 Administrative Management and General Management Consulting Services	$12,646,636	0.5%	Rank history: #3 in FY2021, #7 in FY2022, #58 in FY2023 and #32 in FY2024; unchanged since FY2024.
33	ABT Global LLC Top NAICS codes 541611 Administrative Management and General Management Consulting Services 541620 Environmental Consulting Services	$11,950,693	0.5%	Rank history: not on the FY2021–FY2023 lists and #51 in FY2024; up 18 since FY2024.
34	The Cadmus Group LLC Top NAICS codes 541620 Environmental Consulting Services 541611 Administrative Management and General Management Consulting Services	$11,926,325	0.5%	Rank history: #34 in FY2021, #32 in FY2022, #28 in FY2023 and #12 in FY2024; down 22 since FY2024.
35	Chenega It Enterprise Services, LLC Top NAICS codes 518210 Computing Infrastructure Providers, Data Processing, Web Hosting, and Related Services	$11,375,713	0.5%	Rank history: #22 in FY2021, #51 in FY2022, #60 in FY2023 and #52 in FY2024; up 17 since FY2024.
36	Weston-Techlaw JV LLC Top NAICS codes 541620 Environmental Consulting Services	$10,772,588	0.4%	Rank history: not on the FY2021 list, #52 in FY2022, #30 in FY2023 and #46 in FY2024; up 10 since FY2024.
37	Guidehouse Inc. 2 awardees, including Aptim Federal Services, LLC Top NAICS codes 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology) 541380 Testing Laboratories and Services	$10,533,781	0.4%	Rank history: not on the FY2021–FY2023 lists and #21 in FY2024; down 16 since FY2024.
38	Cape Environmental Management Inc. Top NAICS codes 562910 Remediation Services	$9,952,389	0.4%	Rank history: not on the FY2021–FY2024 lists; up 201 since FY2024.
39	At&T Inc. 4 awardees, including At&T Enterprises, LLC and Att Mobility LLC Top NAICS codes 517110 Wired Telecommunications Carriers 517312 Wireless Telecommunications Carriers (except Satellite) 517810 All Other Telecommunications	$9,436,580	0.4%	Rank history: not on the FY2021–FY2024 lists; up 111 since FY2024.
40	Hdr, Inc. 2 awardees, including Hdr-Obg A Joint Venture and HDR Aptim LLC Top NAICS codes 541330 Engineering Services 562910 Remediation Services	$9,100,034	0.4%	Rank history: #38 in FY2021, #28 in FY2022, #29 in FY2023 and #70 in FY2024; up 30 since FY2024.
41	Systalex Corporation Top NAICS codes 541519 Other Computer Related Services	$9,041,926	0.4%	Rank history: #43 in FY2021, #49 in FY2022, #49 in FY2023 and #42 in FY2024; up 1 since FY2024.
42	MCP Computer Products Inc. Top NAICS codes 334111 Electronic Computer Manufacturing	$8,615,112	0.4%	Rank history: #27 in FY2021, #37 in FY2022, #35 in FY2023 and #55 in FY2024; up 13 since FY2024.
43	Leisnoi Diversified Services, LLC Top NAICS codes 562910 Remediation Services	$8,342,628	0.3%	Rank history: #35 in FY2021, #35 in FY2022, #45 in FY2023 and #41 in FY2024; down 2 since FY2024.
44	A and M Engineering & Environmental Services, Inc. Top NAICS codes 562910 Remediation Services	$7,707,747	0.3%	Rank history: #42 in FY2021, #47 in FY2022, not on the FY2023 list and #60 in FY2024; up 16 since FY2024.
45	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	$7,420,628	0.3%	Rank history: #53 in FY2021, #65 in FY2022, #61 in FY2023 and #95 in FY2024; up 50 since FY2024.
46	Energysolutions, LLC Top NAICS codes 562211 Hazardous Waste Treatment and Disposal	$7,142,524	0.3%	Rank history: not on the FY2021–FY2024 lists; new.
47	Techlaw Consultants Inc. Top NAICS codes 541380 Testing Laboratories and Services 562910 Remediation Services	$7,093,813	0.3%	Rank history: not on the FY2021–FY2023 lists and #39 in FY2024; down 8 since FY2024.
48	Cardinal Point Captains Inc Top NAICS codes 483114 Coastal and Great Lakes Passenger Transportation	$6,909,197	0.3%	Rank history: not on the FY2021–FY2023 lists and #71 in FY2024; up 23 since FY2024.
49	Cape Remediation, LLC Top NAICS codes 562910 Remediation Services	$6,483,206	0.3%	Rank history: not on the FY2021–FY2022 lists, #17 in FY2023 and #53 in FY2024; up 4 since FY2024.
50	Datawiz Corporation Top NAICS codes 541519 Other Computer Related Services	$6,370,159	0.3%	Rank history: not on the FY2021–FY2024 lists; new.
51	C M C, Inc. Top NAICS codes 562910 Remediation Services	$6,209,587	0.3%	Rank history: #32 in FY2021, #16 in FY2022, #13 in FY2023 and #23 in FY2024; down 28 since FY2024.
52	Defense Contracting Activity, LLC Top NAICS codes 561612 Security Guards and Patrol Services	$6,038,946	0.3%	Rank history: not on the FY2021–FY2024 lists; up 56 since FY2024.
53	Fidelis-Bbd, LLC Top NAICS codes 562910 Remediation Services	$6,030,015	0.3%	Rank history: not on the FY2021–FY2024 lists; new.
54	Attain Consulting Group LLC Through Maximus Federal Technology Solutions, LLC Top NAICS codes 541512 Computer Systems Design Services	$5,629,784	0.2%	Rank history: not on the FY2021–FY2024 lists; up 63 since FY2024.
55	Chemtex Environmental Laboratory, Inc. Top NAICS codes 541380 Testing Laboratories and Services	$5,581,437	0.2%	Rank history: not on the FY2021 list, #86 in FY2022 and not on the FY2023–FY2024 lists; up 98 since FY2024.
56	Savan Group, LLC Top NAICS codes 541611 Administrative Management and General Management Consulting Services	$5,505,567	0.2%	Rank history: not on the FY2021–FY2024 lists; up 110 since FY2024.
57	Bonner Analytical Testing Co Top NAICS codes 541380 Testing Laboratories and Services	$5,505,500	0.2%	Rank history: not on the FY2021 list, #80 in FY2022 and not on the FY2023–FY2024 lists; up 50 since FY2024.
58	LPS Kemron JV LLC Top NAICS codes 562910 Remediation Services	$5,370,014	0.2%	Rank history: not on the FY2021–FY2024 lists; new.
59	University of California, Davis Top NAICS codes 541380 Testing Laboratories and Services 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology)	$5,320,591	0.2%	Rank history: not on the FY2021–FY2024 lists; up 65 since FY2024.
60	Pegasus Technical Services, Inc. Top NAICS codes 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology)	$5,056,450	0.2%	Rank history: #45 in FY2021, #57 in FY2022, #55 in FY2023 and #65 in FY2024; up 5 since FY2024.
61	Kgsne JV II LLC Top NAICS codes 562910 Remediation Services	$4,972,718	0.2%	Rank history: not on the FY2021 list, #69 in FY2022, #85 in FY2023 and not on the FY2024 list; up 68 since FY2024.
62	Comptech Computer Technologies, Inc. Top NAICS codes 541519 Other Computer Related Services	$4,943,254	0.2%	Rank history: #84 in FY2021, not on the FY2022 list, #79 in FY2023 and #73 in FY2024; up 11 since FY2024.
63	M.c. Dean, Inc. Top NAICS codes 541330 Engineering Services	$4,815,447	0.2%	Rank history: #50 in FY2021, #64 in FY2022, #69 in FY2023 and #57 in FY2024; down 6 since FY2024.
64	Great Lakes Environmental Center, Inc. Top NAICS codes 541620 Environmental Consulting Services	$4,727,492	0.2%	Rank history: #70 in FY2021, #48 in FY2022, #47 in FY2023 and #58 in FY2024; down 6 since FY2024.
65	Centennial Technologies Inc Top NAICS codes 541611 Administrative Management and General Management Consulting Services	$4,647,921	0.2%	Rank history: not on the FY2021–FY2023 lists and #66 in FY2024; up 1 since FY2024.
66	Environmental Systems Research Institute, Inc. Top NAICS codes 511210 Software Publishers	$4,629,520	0.2%	Rank history: not on the FY2021–FY2023 lists and #56 in FY2024; down 10 since FY2024.
67	Gold Systems, Inc. Top NAICS codes 541511 Custom Computer Programming Services 541519 Other Computer Related Services	$4,628,691	0.2%	Rank history: not on the FY2021–FY2024 lists; new.
68	Environmental Management Support, Inc. Top NAICS codes 541620 Environmental Consulting Services	$4,518,812	0.2%	Rank history: #71 in FY2021, #99 in FY2022, #92 in FY2023 and #93 in FY2024; up 25 since FY2024.
69	Skeo Solutions, Inc. Top NAICS codes 541620 Environmental Consulting Services	$4,504,433	0.2%	Rank history: #72 in FY2021, #26 in FY2022, #33 in FY2023 and #43 in FY2024; down 26 since FY2024.
70	Lintech Global Inc Top NAICS codes 541512 Computer Systems Design Services 541511 Custom Computer Programming Services	$4,289,346	0.2%	Rank history: not on the FY2021–FY2022 lists, #64 in FY2023 and not on the FY2024 list; up 31 since FY2024.
71	Nana Regional Corporation Inc. Through Affigent, LLC Top NAICS codes 541519 Other Computer Related Services	$4,138,618	0.2%	Rank history: not on the FY2021–FY2023 lists and #79 in FY2024; up 8 since FY2024.
72	Toeroek Associates, Inc. Top NAICS codes 541620 Environmental Consulting Services 562910 Remediation Services	$4,131,714	0.2%	Rank history: #59 in FY2021, #41 in FY2022, #42 in FY2023 and #88 in FY2024; up 16 since FY2024.
73	Veracity Consulting, Inc. Top NAICS codes 541519 Other Computer Related Services 541990 All Other Professional, Scientific, and Technical Services	$4,125,229	0.2%	Rank history: #68 in FY2021, #62 in FY2022, #74 in FY2023 and not on the FY2024 list; up 36 since FY2024.
74	Arlluk Technology Solutions LLC Top NAICS codes 541511 Custom Computer Programming Services	$3,996,066	0.2%	Rank history: not on the FY2021–FY2023 lists and #100 in FY2024; up 26 since FY2024.
75	Data Systems Analysts Inc. Top NAICS codes 541512 Computer Systems Design Services	$3,815,503	0.2%	Rank history: #77 in FY2021, #58 in FY2022, #83 in FY2023 and #62 in FY2024; down 13 since FY2024.
76	SRC Inc. Top NAICS codes 541620 Environmental Consulting Services 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology)	$3,644,080	0.2%	Rank history: #37 in FY2021, #46 in FY2022, #51 in FY2023 and #61 in FY2024; down 15 since FY2024.
77	University of North Carolina At Chapel Hill Top NAICS codes 519120 Libraries and Archives 541620 Environmental Consulting Services 541618 Other Management Consulting Services	$3,613,583	0.2%	Rank history: not on the FY2021–FY2023 lists and #98 in FY2024; up 21 since FY2024.
78	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	$3,457,403	0.1%	Rank history: #44 in FY2021, #56 in FY2022, #63 in FY2023 and #63 in FY2024; down 15 since FY2024.
79	Noresco, LLC Top NAICS codes 541330 Engineering Services	$3,245,048	0.1%	Rank history: not on the FY2021–FY2022 lists, #44 in FY2023 and not on the FY2024 list; returned.
80	Specpro Sustainment and Environmental, LLC Top NAICS codes 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology)	$3,192,189	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
81	Redhawk It Solutions, LLC Top NAICS codes 541519 Other Computer Related Services 334290 Other Communications Equipment Manufacturing	$3,132,209	0.1%	Rank history: not on the FY2021–FY2024 lists; up 64 since FY2024.
82	VMD Systems Integrators Inc Top NAICS codes 541512 Computer Systems Design Services	$3,109,114	0.1%	Rank history: not on the FY2021–FY2023 lists and #86 in FY2024; up 4 since FY2024.
83	Amentum Holdings, Inc. 3 awardees, including Amentum Technology, Inc. Top NAICS codes 541330 Engineering Services 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology)	$3,108,724	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
84	AECOM Through URS Group, Inc. Top NAICS codes 562910 Remediation Services	$3,084,295	0.1%	Rank history: #23 in FY2021, #11 in FY2022, #4 in FY2023 and #78 in FY2024; down 6 since FY2024.
85	J.f. Brennan Company, Inc. Top NAICS codes 562910 Remediation Services	$3,021,959	0.1%	Rank history: not on the FY2021 list, #5 in FY2022, #78 in FY2023 and #26 in FY2024; down 59 since FY2024.
86	Diversified Protection Corp Top NAICS codes 561612 Security Guards and Patrol Services	$2,910,412	0.1%	Rank history: #60 in FY2021, #75 in FY2022, #84 in FY2023 and #91 in FY2024; up 5 since FY2024.
87	Airborne Aspect, Inc. Top NAICS codes 541370 Surveying and Mapping (except Geophysical) Services	$2,897,537	0.1%	Rank history: not on the FY2021–FY2024 lists; up 49 since FY2024.
88	Daycom LLC Top NAICS codes 541990 All Other Professional, Scientific, and Technical Services	$2,869,318	0.1%	Rank history: not on the FY2021–FY2024 lists; up 60 since FY2024.
89	Red Rock Remediation JV1 Top NAICS codes 562910 Remediation Services	$2,845,749	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
90	Wilson 5 Service Company, Inc. Top NAICS codes 561210 Facilities Support Services	$2,819,670	0.1%	Rank history: not on the FY2021–FY2022 lists, #97 in FY2023 and #97 in FY2024; up 7 since FY2024.
91	Intepros Federal Incorporated Top NAICS codes 541511 Custom Computer Programming Services	$2,783,097	0.1%	Rank history: not on the FY2021–FY2022 lists, #98 in FY2023 and not on the FY2024 list; up 36 since FY2024.
92	T-Mobile Usa, Inc. Top NAICS codes 517312 Wireless Telecommunications Carriers (except Satellite)	$2,774,973	0.1%	Rank history: not on the FY2021–FY2024 lists; up 193 since FY2024.
93	Versar-Envirocon JV Top NAICS codes 562910 Remediation Services	$2,754,743	0.1%	Rank history: not on the FY2021 list, #98 in FY2022, #52 in FY2023 and not on the FY2024 list; up 48 since FY2024.
94	Patriot LLC Top NAICS codes 541512 Computer Systems Design Services	$2,744,027	0.1%	Rank history: #36 in FY2021, #29 in FY2022, #43 in FY2023 and #54 in FY2024; down 40 since FY2024.
95	Serco Inc Top NAICS codes 541380 Testing Laboratories and Services	$2,711,519	0.1%	Rank history: not on the FY2021–FY2024 lists; up 27 since FY2024.
96	Cape Fear Analytical, LLC Top NAICS codes 541380 Testing Laboratories and Services	$2,696,266	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
97	Rural Community Assistance Corporation Top NAICS codes 541620 Environmental Consulting Services	$2,610,825	0.1%	Rank history: not on the FY2021–FY2024 lists; up 153 since FY2024.
98	Aleut Technical Services, LLC Top NAICS codes 541620 Environmental Consulting Services	$2,597,986	0.1%	Rank history: not on the FY2021–FY2022 lists, #99 in FY2023 and #87 in FY2024; down 11 since FY2024.
99	ManTech International Corporation Through Unison Software Inc. Top NAICS codes 511210 Software Publishers	$2,540,274	0.1%	Rank history: not on the FY2021–FY2024 lists; up 52 since FY2024.
100	Paragon-Jacobs Joint Venture, LLC Top NAICS codes 562910 Remediation Services	$2,539,635	0.1%	Rank history: not on the FY2021–FY2024 lists; 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 $2.4 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 2025 ran Oct 1, 2024 – Sep 30, 2025. 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 FY2024. "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 FY2024 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