Top 100 Contractors in PSC F999: Other Environmental Services, Studies, and Analytical Support, FY2021

Name: Top 100 Contractors in PSC F999: Other Environmental Services, Studies, and Analytical Support, FY2021
Creator: GovTribe

Parent companies by net contract obligations Oct 1, 2020 – Sep 30, 2021 Code page on GovTribe

The top 10 won 61% of FY2021 PSC F999 contract dollars

Contract obligations: $2,653,709,049 Net of deobligations, by contracts coded PSC F999
Contractors: 718 Parent companies with an obligation
Largest contractor: AECOM $796 million, 28.9% of obligations
Data as of: Oct 14, 2026

Contract actions from FPDS (SAM.gov). How the rankings work · Download all 100 rows as CSV

Full ranking

Rank	Contractor	Net obligations	Share	Trend
1	AECOM 10 awardees, including Ucor LLC, Nuclear Waste Partnership LLC and AECOM Technical Services, Inc. Top agencies DOE (Department of Energy) Army (Department of the Army) EPA (Environmental Protection Agency)	$795,874,921	28.9%	Rank history: #1 in FY2022, not on the FY2023–FY2024 lists and #53 in FY2025; unchanged since FY2020.
2	Fluor Corporation Through Fluor Idaho LLC Top agencies DOE (Department of Energy)	$408,050,571	14.8%	Rank history: #24 in FY2022 and not on the FY2023–FY2025 lists; up 1 since FY2020.
3	Weeks Marine Inc. Top agencies Commerce (Department of Commerce)	$90,946,528	3.3%	Rank history: #28 in FY2022, #26 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
4	Hydrogeologic, Inc. Top agencies Army (Department of the Army) USAF (Department of the Air Force) EPA (Environmental Protection Agency)	$67,465,595	2.5%	Rank history: #8 in FY2022, #7 in FY2023, #10 in FY2024 and #8 in FY2025; up 3 since FY2020.
5	Cook Inlet Region Inc. 7 awardees, including North Wind Portage, Inc., North Wind, Inc. and North Wind Resource Consulting LLC Top agencies DOE (Department of Energy) Army (Department of the Army) DOI (Department of the Interior)	$62,614,393	2.3%	Rank history: #9 in FY2022, #93 in FY2023 and not on the FY2024–FY2025 lists; up 3 since FY2020.
6	Nuclear Waste Partnership LLC Top agencies DOE (Department of Energy)	$60,619,531	2.2%	Rank history: #25 in FY2022 and not on the FY2023–FY2025 lists; down 2 since FY2020.
7	Weston - Er Federal Services, LLC Top agencies USAF (Department of the Air Force)	$56,813,893	2.1%	Rank history: #16 in FY2022, not on the FY2023 list, #72 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
8	Sevenson Environmental Services, Inc. Top agencies EPA (Environmental Protection Agency) Army (Department of the Army)	$52,995,164	1.9%	Rank history: #2 in FY2022, #9 in FY2023, #4 in FY2024 and #10 in FY2025; down 2 since FY2020.
9	Hanford Laboratory Management and Integration LLC Top agencies DOE (Department of Energy)	$37,946,839	1.4%	Rank history: #4 in FY2022, #6 in FY2023, #5 in FY2024 and #5 in FY2025; up 149 since FY2020.
10	EA Engineering, Science, and Technology, Inc., PBC Top agencies Army (Department of the Army) USAF (Department of the Air Force) EPA (Environmental Protection Agency)	$36,318,461	1.3%	Rank history: #11 in FY2022, #2 in FY2023, #15 in FY2024 and #13 in FY2025; down 1 since FY2020.
11	Cape Environmental Management Inc. 3 awardees Top agencies Navy (Department of the Navy) Army (Department of the Army) USAF (Department of the Air Force)	$36,139,686	1.3%	Rank history: #12 in FY2022, #36 in FY2023, #29 in FY2024 and #30 in FY2025; unchanged since FY2020.
12	Navarro Research and Engineering, Inc. Top agencies DOE (Department of Energy) NASA (National Aeronautics and Space Administration)	$32,219,646	1.2%	Rank history: #13 in FY2022, #11 in FY2023, #14 in FY2024 and #12 in FY2025; up 28 since FY2020.
13	Environmental Chemical Corporation Top agencies Army (Department of the Army) GSA (General Services Administration)	$29,683,933	1.1%	Rank history: #19 in FY2022, #14 in FY2023, #16 in FY2024 and #20 in FY2025; up 13 since FY2020.
14	Bay West-Ahtna Joint Venture, LLC Top agencies Army (Department of the Army)	$26,566,166	1.0%	Rank history: #41 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
15	Tetra Tech, Inc. 11 awardees, including Ard, Inc. and Tetra TECH EC, Inc. Top agencies USAID (US Agency for International Development) Army (Department of the Army) EPA (Environmental Protection Agency)	$22,056,507	0.8%	Rank history: #17 in FY2022, #19 in FY2023, #19 in FY2024 and #18 in FY2025; down 3 since FY2020.
16	Nuclear Fuel Services Inc. Top agencies DOE (Department of Energy)	$22,035,318	0.8%	Rank history: not on the FY2022 list, #42 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
17	Brice-Aecom JV1 Top agencies USAF (Department of the Air Force) Army (Department of the Army)	$20,555,589	0.7%	Rank history: #46 in FY2022, #28 in FY2023 and not on the FY2024–FY2025 lists; up 78 since FY2020.
18	Bhate Zapata, LLC Top agencies Army (Department of the Army)	$19,343,538	0.7%	Rank history: #68 in FY2022, #37 in FY2023, #76 in FY2024 and not on the FY2025 list; up 9 since FY2020.
19	Jacobs Engineering Group Inc. 6 awardees, including Ch2M Hill, Inc., Ch2M Hill Constructors, Inc. and Jacobs Government Services Company Top agencies EPA (Environmental Protection Agency) USAF (Department of the Air Force) Army (Department of the Army)	$17,962,641	0.7%	Rank history: #85 in FY2022, #4 in FY2023, #2 in FY2024 and not on the FY2025 list; up 14 since FY2020.
20	Weston Solutions Holdings, Inc. 2 awardees, including Weston Solutions Inc. Top agencies Army (Department of the Army) EPA (Environmental Protection Agency)	$17,940,740	0.7%	Rank history: #29 in FY2022, #49 in FY2023, not on the FY2024 list and #92 in FY2025; down 7 since FY2020.
21	Tli-Bay West Joint Venture, LLC Top agencies Army (Department of the Army)	$17,265,863	0.6%	Rank history: not on the FY2022–FY2025 lists; up 97 since FY2020.
22	Sol Solutions, LLC Top agencies Army (Department of the Army) Navy (Department of the Navy)	$16,010,669	0.6%	Rank history: #27 in FY2022, #32 in FY2023 and not on the FY2024–FY2025 lists; unchanged since FY2020.
23	Environmental Restoration LLC Top agencies EPA (Environmental Protection Agency)	$15,249,130	0.6%	Rank history: #6 in FY2022, #12 in FY2023, #32 in FY2024 and #24 in FY2025; up 251 since FY2020.
24	Aptim Federal Services LLC Top agencies Army (Department of the Army) Navy (Department of the Navy) DOE (Department of Energy)	$13,349,566	0.5%	Rank history: #21 in FY2022, #5 in FY2023, #66 in FY2024 and not on the FY2025 list; down 9 since FY2020.
25	BTP Services, LLC Top agencies DOE (Department of Energy)	$13,081,581	0.5%	Rank history: #26 in FY2022 and not on the FY2023–FY2025 lists; up 12 since FY2020.
26	Mmg-Tli JV, LLC Top agencies USAF (Department of the Air Force) Army (Department of the Army)	$12,949,712	0.5%	Rank history: not on the FY2022–FY2025 lists; up 72 since FY2020.
27	Leidos Holdings, Inc. 2 awardees, including Leidos, Inc. Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$12,562,898	0.5%	Rank history: #18 in FY2022, #24 in FY2023, #20 in FY2024 and #14 in FY2025; up 9 since FY2020.
28	I.m. Systems Group, Inc. Top agencies Commerce (Department of Commerce)	$12,269,257	0.4%	Rank history: not on the FY2022–FY2025 lists; down 18 since FY2020.
29	Battelle Memorial Institute Top agencies Navy (Department of the Navy) EPA (Environmental Protection Agency)	$12,073,286	0.4%	Rank history: not on the FY2022–FY2023 lists, #75 in FY2024 and #47 in FY2025; up 6 since FY2020.
30	Ahtna, Incorporated 3 awardees, including Ahtna Global LLC, Ahtna Environmental, Inc. and Ahtna Facility Services, Incorporated Top agencies Army (Department of the Army) DOE (Department of Energy) USAF (Department of the Air Force)	$11,796,975	0.4%	Rank history: #65 in FY2022, #45 in FY2023 and not on the FY2024–FY2025 lists; down 9 since FY2020.
31	Ardl Inc. Top agencies EPA (Environmental Protection Agency) Army (Department of the Army)	$10,839,953	0.4%	Rank history: not on the FY2022 list, #66 in FY2023, not on the FY2024 list and #93 in FY2025; new, not ranked in FY2020.
32	Lynker Corporation Top agencies Commerce (Department of Commerce)	$10,465,375	0.4%	Rank history: not on the FY2022–FY2025 lists; down 8 since FY2020.
33	Ayuda Arcadis 8A Joint Venture LLC Top agencies Army (Department of the Army)	$10,356,629	0.4%	Rank history: #73 in FY2022, #82 in FY2023, #51 in FY2024 and #79 in FY2025; up 78 since FY2020.
34	Paragon Professional Services LLC Top agencies DOE (Department of Energy)	$10,184,785	0.4%	Rank history: #35 in FY2022, #22 in FY2023, #28 in FY2024 and #16 in FY2025; up 33 since FY2020.
35	Waste Control Specialists LLC Top agencies DOE (Department of Energy) EPA (Environmental Protection Agency)	$10,116,083	0.4%	Rank history: #38 in FY2022, #46 in FY2023 and not on the FY2024–FY2025 lists; up 116 since FY2020.
36	Four Rivers Nuclear Partnership LLC Top agencies DOE (Department of Energy)	$9,798,104	0.4%	Rank history: #33 in FY2022, #20 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
37	General Dynamics Corporation 4 awardees, including General Dynamics Information Technology, Inc. and Csra LLC Top agencies EPA (Environmental Protection Agency) Commerce (Department of Commerce)	$9,478,664	0.3%	Rank history: not on the FY2022 list, #63 in FY2023, #42 in FY2024 and not on the FY2025 list; up 40 since FY2020.
38	Aerostar SES LLC 2 awardees Top agencies Army (Department of the Army) Navy (Department of the Navy)	$9,322,788	0.3%	Rank history: #69 in FY2022, #41 in FY2023 and not on the FY2024–FY2025 lists; up 10 since FY2020.
39	AECOM Technical Services, Inc. Top agencies Army (Department of the Army)	$8,933,759	0.3%	Rank history: not on the FY2022–FY2023 lists, #13 in FY2024 and #36 in FY2025; new, not ranked in FY2020.
40	The Solution Foundry, LLC Top agencies USAF (Department of the Air Force) Army (Department of the Army)	$8,904,080	0.3%	Rank history: #36 in FY2022, #40 in FY2023, #36 in FY2024 and #28 in FY2025; down 12 since FY2020.
41	Ayuda-Plexus Joint Venture LLC Top agencies Army (Department of the Army)	$8,866,702	0.3%	Rank history: #78 in FY2022, not on the FY2023 list, #96 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
42	DAI Global LLC Top agencies USAID (US Agency for International Development)	$8,327,893	0.3%	Rank history: #74 in FY2022 and not on the FY2023–FY2025 lists; down 26 since FY2020.
43	Genwest Systems Inc. Top agencies Commerce (Department of Commerce)	$8,135,785	0.3%	Rank history: #51 in FY2022, #61 in FY2023, not on the FY2024 list and #75 in FY2025; down 1 since FY2020.
44	Seres Engineering & Services LLC 3 awardees, including Seres-Arcadis 8(A) JV2 LLC and Seres-Arcadis 8(A) JV, LLC Top agencies Army (Department of the Army) Navy (Department of the Navy)	$7,486,701	0.3%	Rank history: #10 in FY2022, #47 in FY2023 and not on the FY2024–FY2025 lists; up 14 since FY2020.
45	Renova Environmental Company Top agencies Army (Department of the Army)	$7,479,192	0.3%	Rank history: not on the FY2022–FY2025 lists; up 89 since FY2020.
46	Asl-Mmg Joint Venture LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$7,279,820	0.3%	Rank history: not on the FY2022–FY2025 lists; up 25 since FY2020.
47	Bay West LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$7,057,022	0.3%	Rank history: #53 in FY2022, #21 in FY2023, #22 in FY2024 and #19 in FY2025; down 22 since FY2020.
48	Bb&E, Inc. Top agencies NASA (National Aeronautics and Space Administration) USAF (Department of the Air Force)	$6,910,770	0.3%	Rank history: #55 in FY2022, #60 in FY2023, #48 in FY2024 and #38 in FY2025; up 54 since FY2020.
49	Eastern Research Group Inc. Top agencies EPA (Environmental Protection Agency)	$6,863,933	0.2%	Rank history: #42 in FY2022, #25 in FY2023, #17 in FY2024 and #27 in FY2025; down 18 since FY2020.
50	Arcadis N.V. 2 awardees, including Arcadis U.s., Inc. Top agencies USAF (Department of the Air Force) Army (Department of the Army) Navy (Department of the Navy)	$6,819,825	0.2%	Rank history: not on the FY2022–FY2025 lists; down 32 since FY2020.
51	Huntington Ingalls Industries, Inc. Through Newport News Nuclear Bwxt-Los Alamos LLC Top agencies DOE (Department of Energy)	$6,659,705	0.2%	Rank history: #39 in FY2022, #39 in FY2023, not on the FY2024 list and #44 in FY2025; up 10 since FY2020.
52	R8I Cabrera Remediation and Construction \"Llc\" Top agencies Army (Department of the Army)	$6,626,180	0.2%	Rank history: not on the FY2022–FY2025 lists; down 18 since FY2020.
53	Oneida Nation 4 awardees, including Sustainment & Restoration Services, LLC and Oneida Total Integrated Enterprises LLC Top agencies USAF (Department of the Air Force) Army (Department of the Army)	$6,563,856	0.2%	Rank history: #40 in FY2022, #52 in FY2023 and not on the FY2024–FY2025 lists; down 39 since FY2020.
54	SES Civil and Environmental LLC Top agencies USAF (Department of the Air Force) Navy (Department of the Navy) Army (Department of the Army)	$6,429,993	0.2%	Rank history: #45 in FY2022, #34 in FY2023 and not on the FY2024–FY2025 lists; down 34 since FY2020.
55	Credere Associates, LLC Top agencies Army (Department of the Army)	$6,290,302	0.2%	Rank history: not on the FY2022–FY2025 lists; up 332 since FY2020.
56	Oregon University System 2 awardees, including Oregon State University and Portland State University Top agencies DOI (Department of the Interior) Commerce (Department of Commerce) EPA (Environmental Protection Agency)	$6,244,085	0.2%	Rank history: #71 in FY2022 and not on the FY2023–FY2025 lists; up 48 since FY2020.
57	Bhate Environmental Associates, Inc. Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$6,115,837	0.2%	Rank history: #52 in FY2022, #68 in FY2023, #87 in FY2024 and #68 in FY2025; down 1 since FY2020.
58	The Aleut Corporation 5 awardees, including Aleut Remediation LLC, Aleut Services, LLC and Aleut Construction LLC Top agencies Army (Department of the Army) EPA (Environmental Protection Agency) Navy (Department of the Navy)	$6,079,109	0.2%	Rank history: not on the FY2022 list, #97 in FY2023 and not on the FY2024–FY2025 lists; up 171 since FY2020.
59	Confederated Salish and Kootenai Tribes 2 awardees, including S & K Logistics Services LLC and S & K Federal Services LLC Top agencies DOE (Department of Energy)	$5,982,551	0.2%	Rank history: #81 in FY2022, #35 in FY2023, #65 in FY2024 and not on the FY2025 list; up 27 since FY2020.
60	Link Technologies Inc. Top agencies DOE (Department of Energy)	$5,788,321	0.2%	Rank history: #62 in FY2022, #62 in FY2023, #52 in FY2024 and #50 in FY2025; up 16 since FY2020.
61	Calista Corp Through Brice Environmental Services Corporation Top agencies Army (Department of the Army)	$5,775,618	0.2%	Rank history: #49 in FY2022 and not on the FY2023–FY2025 lists; up 18 since FY2020.
62	Natives of Kodiak, Incorporated 4 awardees, including Koman Government Solutions LLC, Environmental Assessment Services, LLC and Trinity Analysis and Development Corp. Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$5,587,724	0.2%	Rank history: #37 in FY2022, #43 in FY2023 and not on the FY2024–FY2025 lists; down 12 since FY2020.
63	ST George Tanaq Corp 2 awardees, including Tanaq Environmental LLC and Helios Resources, Ltd Top agencies Army (Department of the Army) USAF (Department of the Air Force) Navy (Department of the Navy)	$5,554,490	0.2%	Rank history: not on the FY2022–FY2025 lists; up 61 since FY2020.
64	Renova-Sovereign Joint Venture Top agencies Army (Department of the Army)	$5,531,565	0.2%	Rank history: #75 in FY2022, not on the FY2023–FY2024 lists and #96 in FY2025; up 111 since FY2020.
65	Tepa, LLC 2 awardees, including Tehama, LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force) Navy (Department of the Navy)	$5,518,414	0.2%	Rank history: #91 in FY2022, #87 in FY2023 and not on the FY2024–FY2025 lists; down 14 since FY2020.
66	Vernadero Group Inc. Top agencies Navy (Department of the Navy)	$5,343,455	0.2%	Rank history: not on the FY2022 list, #64 in FY2023, #64 in FY2024 and not on the FY2025 list; down 14 since FY2020.
67	The NDN Sundance JV LLC Top agencies USAF (Department of the Air Force) OSD (Office of the Secretary of Defense) Army (Department of the Army)	$4,786,133	0.2%	Rank history: #82 in FY2022 and not on the FY2023–FY2025 lists; up 323 since FY2020.
68	Cherokee Nation 2 awardees, including Cherokee Federal Solutions, L.L.C. and Cherokee Nation Management & Consulting, L.l.c.. Top agencies Army (Department of the Army) DOI (Department of the Interior) USDA (Department of Agriculture)	$4,739,325	0.2%	Rank history: not on the FY2022 list, #96 in FY2023 and not on the FY2024–FY2025 lists; up 25 since FY2020.
69	Auxilio FPM Joint Venture LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$4,713,369	0.2%	Rank history: #100 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
70	Seres-Arcadis SB JV, LLC Top agencies Army (Department of the Army)	$4,590,197	0.2%	Rank history: #60 in FY2022, #74 in FY2023, #30 in FY2024 and #60 in FY2025; down 24 since FY2020.
71	GSI Mmrp JV LLC Top agencies Army (Department of the Army)	$4,571,345	0.2%	Rank history: #43 in FY2022, #65 in FY2023 and not on the FY2024–FY2025 lists; down 30 since FY2020.
72	Environmental Research Group, L.L.C. Top agencies Army (Department of the Army) Navy (Department of the Navy) VA (Department of Veterans Affairs)	$4,529,796	0.2%	Rank history: #70 in FY2022 and not on the FY2023–FY2025 lists; up 1 since FY2020.
73	Egc-Ageiss LLC Top agencies USAF (Department of the Air Force) Army (Department of the Army)	$4,507,233	0.2%	Rank history: not on the FY2022–FY2025 lists; up 36 since FY2020.
74	On Assignment, Inc. Through ECS Federal, LLC Top agencies Commerce (Department of Commerce)	$4,391,083	0.2%	Rank history: not on the FY2022 list, #100 in FY2023 and not on the FY2024–FY2025 lists; down 27 since FY2020.
75	Umyuaq Consulting Group, LLC Top agencies Army (Department of the Army)	$4,328,440	0.2%	Rank history: #44 in FY2022, #75 in FY2023, #84 in FY2024 and not on the FY2025 list; up 12 since FY2020.
76	Brice Engineering, LLC Top agencies Army (Department of the Army)	$4,276,974	0.2%	Rank history: #31 in FY2022, #10 in FY2023, #24 in FY2024 and #25 in FY2025; down 14 since FY2020.
77	Cti-Tpmc Environmental Services LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$4,244,435	0.2%	Rank history: #67 in FY2022, #70 in FY2023 and not on the FY2024–FY2025 lists; up 28 since FY2020.
78	Tekpro Support Services, LLC Top agencies DOE (Department of Energy) USAF (Department of the Air Force)	$3,970,907	0.1%	Rank history: #79 in FY2022, #79 in FY2023, #74 in FY2024 and #63 in FY2025; up 10 since FY2020.
79	PG Environmental, LLC Top agencies DOI (Department of the Interior)	$3,925,826	0.1%	Rank history: not on the FY2022 list, #91 in FY2023 and not on the FY2024–FY2025 lists; up 35 since FY2020.
80	Association of Consultants and Engineers Top agencies Navy (Department of the Navy)	$3,845,351	0.1%	Rank history: #96 in FY2022, #50 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
81	Hgl-Aptim Applied Science and Technology JV, LLC Top agencies Army (Department of the Army)	$3,785,251	0.1%	Rank history: #32 in FY2022, #67 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
82	ABT Global LLC 2 awardees Top agencies EPA (Environmental Protection Agency) Commerce (Department of Commerce)	$3,755,555	0.1%	Rank history: #95 in FY2022, #90 in FY2023 and not on the FY2024–FY2025 lists; down 10 since FY2020.
83	R & K Enterprise Solutions Inc. Top agencies DHS (Department of Homeland Security)	$3,737,692	0.1%	Rank history: #92 in FY2022 and not on the FY2023–FY2025 lists; up 2 since FY2020.
84	AOR International, Inc. Top agencies USAF (Department of the Air Force)	$3,697,653	0.1%	Rank history: not on the FY2022–FY2025 lists; down 3 since FY2020.
85	ECO & Associates, Inc. Top agencies Army (Department of the Army)	$3,613,463	0.1%	Rank history: #56 in FY2022 and not on the FY2023–FY2025 lists; down 41 since FY2020.
86	Jesco Environmental & Geotechnical Services, Inc. Top agencies Navy (Department of the Navy) Army (Department of the Army)	$3,531,989	0.1%	Rank history: not on the FY2022–FY2025 lists; up 37 since FY2020.
87	NA Alii Consulting & Sales LLC Top agencies Army (Department of the Army)	$3,515,347	0.1%	Rank history: not on the FY2022–FY2025 lists; up 226 since FY2020.
88	Consolidated Safety Services Incorporated Top agencies Commerce (Department of Commerce)	$3,514,857	0.1%	Rank history: not on the FY2022–FY2025 lists; down 29 since FY2020.
89	Gulf South Research Corp Top agencies Navy (Department of the Navy) Army (Department of the Army)	$3,514,159	0.1%	Rank history: not on the FY2022–FY2025 lists; up 37 since FY2020.
90	Skeo Solutions, Inc. Top agencies EPA (Environmental Protection Agency)	$3,508,914	0.1%	Rank history: #22 in FY2022, #33 in FY2023, #27 in FY2024 and #67 in FY2025; down 58 since FY2020.
91	Nobis Engineering, Inc. Top agencies EPA (Environmental Protection Agency) Army (Department of the Army)	$3,506,220	0.1%	Rank history: not on the FY2022–FY2025 lists; up 72 since FY2020.
92	Fpm-Cti JV, LLC Top agencies Army (Department of the Army) EPA (Environmental Protection Agency)	$3,293,021	0.1%	Rank history: not on the FY2022–FY2025 lists; up 183 since FY2020.
93	Sst-Ageiss2 JV, LLC Top agencies USAF (Department of the Air Force) Army (Department of the Army)	$3,284,304	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
94	Earth Networks Inc. Top agencies Commerce (Department of Commerce)	$3,123,640	0.1%	Rank history: not on the FY2022–FY2025 lists; up 12 since FY2020.
95	Industrial Economics Inc. Top agencies DOI (Department of the Interior) Commerce (Department of Commerce) EPA (Environmental Protection Agency)	$3,075,753	0.1%	Rank history: #66 in FY2022, #51 in FY2023, #56 in FY2024 and #74 in FY2025; down 38 since FY2020.
96	Swift River Versar JV Top agencies USAF (Department of the Air Force) Army (Department of the Army) Navy (Department of the Navy)	$2,973,377	0.1%	Rank history: not on the FY2022–FY2025 lists; up 45 since FY2020.
97	Perikin Enterprises LLC Top agencies Army (Department of the Army)	$2,957,555	0.1%	Rank history: not on the FY2022–FY2025 lists; up 89 since FY2020.
98	Bristol Environmental Solutions LLC Top agencies Army (Department of the Army)	$2,954,877	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
99	Trevet-Bay West Joint Venture, LLC Top agencies Army (Department of the Army)	$2,940,207	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
100	University of Montana System Through University of Montana Top agencies DOI (Department of the Interior)	$2,900,716	0.1%	Rank history: not on the FY2022–FY2025 lists; up 33 since FY2020.

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100 of 718 contractors listed here. See the rest on GovTribe.

How this ranking works

Source: every contract action FPDS records (as published on SAM.gov) in the period, as GovTribe received it.
Amounts are net obligations: what was obligated, less what was deobligated. Shares are of $2.75 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

Who were the top 10 PSC F999 contractors in FY2021?

1. AECOM ($796M), 2. Fluor Corporation ($408M), 3. Weeks Marine Inc. ($90.9M), 4. Hydrogeologic, Inc. ($67.5M), 5. Cook Inlet Region Inc. ($62.6M), 6. Nuclear Waste Partnership LLC ($60.6M), 7. Weston - Er Federal Services, LLC ($56.8M), 8. Sevenson Environmental Services, Inc. ($53M), 9. Hanford Laboratory Management and Integration LLC ($37.9M), 10. EA Engineering, Science, and Technology, Inc., PBC ($36.3M).

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