Top 100 Contractors in PSC F: Natural Resources Management, FY2021

Name: Top 100 Contractors in PSC F: Natural Resources Management, FY2021
Creator: GovTribe

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

The top 10 won 40% of FY2021 PSC F contract dollars

Contract obligations: $6,102,372,013 Net of deobligations, by contracts coded PSC F or a code under it
Contractors: 4,990 Parent companies with an obligation
Largest contractor: AECOM $805 million, 12.4% 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 12 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)	$805,374,715	12.4%	Rank history: #2 in FY2022, #11 in FY2023 and not on the FY2024–FY2025 lists; up 1 since FY2020.
2	Bechtel Corp 2 awardees, including Bechtel Parsons Blue Grass, A Joint Venture and Bechtel National, Inc. Top agencies Army (Department of the Army)	$655,463,231	10.1%	Rank history: #1 in FY2022, #1 in FY2023, #2 in FY2024 and #4 in FY2025; down 1 since FY2020.
3	Fluor Corporation Through Fluor Idaho LLC Top agencies DOE (Department of Energy)	$408,050,571	6.3%	Rank history: #61 in FY2022 and not on the FY2023–FY2025 lists; up 2 since FY2020.
4	Hydrogeologic, Inc. Top agencies Army (Department of the Army) EPA (Environmental Protection Agency) USAF (Department of the Air Force)	$157,139,592	2.4%	Rank history: #5 in FY2022, #5 in FY2023, #8 in FY2024 and #8 in FY2025; up 4 since FY2020.
5	Perimeter Solutions LP Top agencies USDA (Department of Agriculture) DOI (Department of the Interior)	$134,929,699	2.1%	Rank history: #12 in FY2022, #16 in FY2023 and not on the FY2024–FY2025 lists; up 4 since FY2020.
6	Cook Inlet Region Inc. 10 awardees, including North Wind Portage, Inc., North Wind Resource Consulting LLC and North Wind, Inc. Top agencies Army (Department of the Army) DOE (Department of Energy) DOI (Department of the Interior)	$126,013,742	1.9%	Rank history: #9 in FY2022, #18 in FY2023, #30 in FY2024 and not on the FY2025 list; up 9 since FY2020.
7	Weeks Marine Inc. 2 awardees Top agencies Commerce (Department of Commerce) DHS (Department of Homeland Security)	$90,981,528	1.4%	Rank history: #76 in FY2022, #70 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
8	Environmental Restoration LLC Top agencies EPA (Environmental Protection Agency) DOJ (Department of Justice) USAF (Department of the Air Force)	$83,911,783	1.3%	Rank history: #4 in FY2022, #8 in FY2023, #20 in FY2024 and #10 in FY2025; up 4 since FY2020.
9	Arctic Slope Regional Corporation 3 awardees, including Asrc Consulting & Environmental Services, LLC, Environmental Quality Management, Inc. and EQM Services, LLC Top agencies DOE (Department of Energy) EPA (Environmental Protection Agency) USAF (Department of the Air Force)	$70,678,914	1.1%	Rank history: #36 in FY2022, #9 in FY2023, #63 in FY2024 and #6 in FY2025; up 52 since FY2020.
10	EA Engineering, Science, and Technology, Inc., PBC 2 awardees Top agencies Army (Department of the Army) EPA (Environmental Protection Agency) USAF (Department of the Air Force)	$66,996,302	1.0%	Rank history: #3 in FY2022, #4 in FY2023 and not on the FY2024–FY2025 lists; unchanged since FY2020.
11	Bechtel National, Inc. Top agencies Army (Department of the Army)	$63,000,000	1.0%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
12	Nuclear Waste Partnership LLC Top agencies DOE (Department of Energy)	$60,619,531	0.9%	Rank history: #62 in FY2022 and not on the FY2023–FY2025 lists; down 6 since FY2020.
13	Jacobs Engineering Group Inc. 9 awardees, including Amentum Technology, Inc., Ch2M Hill, Inc. and Ch2M Hill Constructors, Inc. Top agencies Army (Department of the Army) EPA (Environmental Protection Agency) USAF (Department of the Air Force)	$58,616,947	0.9%	Rank history: #30 in FY2022, #3 in FY2023, #4 in FY2024 and not on the FY2025 list; up 21 since FY2020.
14	Weston - Er Federal Services, LLC Top agencies USAF (Department of the Air Force)	$56,813,893	0.9%	Rank history: #38 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
15	Medvolt Construction Services, LLC Top agencies Army (Department of the Army)	$54,480,536	0.8%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
16	Tetra Tech, Inc. 18 awardees, including Ard, Inc. and Tetra TECH EC, Inc. Top agencies USAID (US Agency for International Development) EPA (Environmental Protection Agency) Army (Department of the Army)	$53,679,222	0.8%	Rank history: #13 in FY2022, #17 in FY2023, #17 in FY2024 and #14 in FY2025; down 5 since FY2020.
17	Sevenson Environmental Services, Inc. Top agencies EPA (Environmental Protection Agency) Army (Department of the Army)	$48,429,013	0.7%	Rank history: #6 in FY2022, #14 in FY2023, #3 in FY2024 and #5 in FY2025; down 4 since FY2020.
18	Navarro Research and Engineering, Inc. Top agencies DOE (Department of Energy) Army (Department of the Army) USAF (Department of the Air Force)	$41,464,519	0.6%	Rank history: #21 in FY2022, #24 in FY2023, #27 in FY2024 and #21 in FY2025; up 2 since FY2020.
19	Cape Environmental Management Inc. 3 awardees Top agencies Navy (Department of the Navy) Army (Department of the Army) USAF (Department of the Air Force)	$40,447,741	0.6%	Rank history: #15 in FY2022, #77 in FY2023, #77 in FY2024 and #65 in FY2025; down 2 since FY2020.
20	Hanford Laboratory Management and Integration LLC Top agencies DOE (Department of Energy)	$37,946,839	0.6%	Rank history: #8 in FY2022, #10 in FY2023, #9 in FY2024 and #13 in FY2025; up 395 since FY2020.
21	Oneida Nation 5 awardees, including Sustainment & Restoration Services, LLC and Oneida Total Integrated Enterprises LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force) DOI (Department of the Interior)	$33,560,551	0.5%	Rank history: #16 in FY2022, #21 in FY2023, #94 in FY2024 and not on the FY2025 list; down 5 since FY2020.
22	Environmental Chemical Corporation 3 awardees, including ECC Insight Philotechnics LLC and ECC Insight LLC Top agencies Army (Department of the Army) Navy (Department of the Navy) GSA (General Services Administration)	$31,969,703	0.5%	Rank history: #51 in FY2022, #26 in FY2023, #26 in FY2024 and #37 in FY2025; up 24 since FY2020.
23	Brice-Aecom JV1 Top agencies USAF (Department of the Air Force) Army (Department of the Army)	$30,797,283	0.5%	Rank history: not on the FY2022 list, #72 in FY2023 and not on the FY2024–FY2025 lists; up 197 since FY2020.
24	GPC Consolidated Reporting Top agencies USDA (Department of Agriculture)	$29,816,062	0.5%	Rank history: not on the FY2022–FY2025 lists; up 25 since FY2020.
25	Aptim AECOM Decommissioning, LLC Top agencies Army (Department of the Army)	$28,844,304	0.4%	Rank history: not on the FY2022 list, #23 in FY2023 and not on the FY2024–FY2025 lists; down 7 since FY2020.
26	Kemron Environmental Services, Inc. Top agencies EPA (Environmental Protection Agency) Army (Department of the Army) Navy (Department of the Navy)	$27,168,505	0.4%	Rank history: #32 in FY2022, #42 in FY2023 and not on the FY2024–FY2025 lists; up 21 since FY2020.
27	Bay West-Ahtna Joint Venture, LLC Top agencies Army (Department of the Army)	$26,566,166	0.4%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
28	Delta Land Services LLC Top agencies Army (Department of the Army)	$26,260,302	0.4%	Rank history: #89 in FY2022 and not on the FY2023–FY2025 lists; up 259 since FY2020.
29	Leidos Holdings, Inc. 2 awardees, including Leidos, Inc. Top agencies Army (Department of the Army) DHS (Department of Homeland Security) DOE (Department of Energy)	$25,893,135	0.4%	Rank history: #34 in FY2022, #31 in FY2023, #44 in FY2024 and #39 in FY2025; up 33 since FY2020.
30	Camp Dresser & Mckee Inc. 3 awardees, including CDM Federal Programs Corporation Top agencies EPA (Environmental Protection Agency) DOI (Department of the Interior)	$25,494,495	0.4%	Rank history: #28 in FY2022 and not on the FY2023–FY2025 lists; up 110 since FY2020.
31	Bristol Environmental Solutions LLC Top agencies Army (Department of the Army)	$25,206,437	0.4%	Rank history: not on the FY2022–FY2025 lists; up 1 since FY2020.
32	Ahtna, Incorporated 4 awardees, including Ahtna Global LLC, Ahtna Environmental, Inc. and Ahtna Facility Services, Incorporated Top agencies Army (Department of the Army) DOT (Department of Transportation) DOE (Department of Energy)	$24,106,049	0.4%	Rank history: #81 in FY2022, #62 in FY2023 and not on the FY2024–FY2025 lists; down 10 since FY2020.
33	Management & Engineering Technologies International Inc. Top agencies USDA (Department of Agriculture)	$23,979,816	0.4%	Rank history: #18 in FY2022, #76 in FY2023 and not on the FY2024–FY2025 lists; down 8 since FY2020.
34	Aptim Federal Services LLC Top agencies Army (Department of the Army) Navy (Department of the Navy) DOE (Department of Energy)	$23,163,286	0.4%	Rank history: #17 in FY2022, #6 in FY2023 and not on the FY2024–FY2025 lists; down 15 since FY2020.
35	Sol Solutions, LLC Top agencies Army (Department of the Army) Navy (Department of the Navy)	$22,347,890	0.3%	Rank history: #52 in FY2022, #57 in FY2023 and not on the FY2024–FY2025 lists; unchanged since FY2020.
36	Battelle Memorial Institute Top agencies Navy (Department of the Navy) HHS (Department of Health and Human Services) EPA (Environmental Protection Agency)	$22,314,875	0.3%	Rank history: not on the FY2022–FY2025 lists; up 8 since FY2020.
37	Nuclear Fuel Services Inc. Top agencies DOE (Department of Energy)	$22,035,318	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
38	Weston Solutions Holdings, Inc. 3 awardees, including Weston Solutions Inc. Top agencies Army (Department of the Army) EPA (Environmental Protection Agency)	$21,405,574	0.3%	Rank history: #43 in FY2022, #65 in FY2023, #46 in FY2024 and not on the FY2025 list; down 24 since FY2020.
39	Bhate Zapata, LLC Top agencies Army (Department of the Army) DLA (Defense Logistics Agency)	$20,539,218	0.3%	Rank history: not on the FY2022–FY2025 lists; up 16 since FY2020.
40	Houston's Too LC Top agencies USDA (Department of Agriculture)	$19,679,427	0.3%	Rank history: not on the FY2022–FY2024 lists and #86 in FY2025; up 86 since FY2020.
41	Guardian Environmental Services Co Inc. Top agencies EPA (Environmental Protection Agency)	$19,674,091	0.3%	Rank history: not on the FY2022–FY2025 lists; up 81 since FY2020.
42	Itsi Gilbane Japan G.K. 2 awardees, including Gilbane Federal and Ges-Aecom JV Top agencies Navy (Department of the Navy) EPA (Environmental Protection Agency)	$19,522,367	0.3%	Rank history: #65 in FY2022 and not on the FY2023–FY2025 lists; up 61 since FY2020.
43	Brice Engineering, LLC Top agencies Army (Department of the Army) DHS (Department of Homeland Security)	$19,198,691	0.3%	Rank history: #25 in FY2022, #12 in FY2023, #47 in FY2024 and #40 in FY2025; up 22 since FY2020.
44	Hdr, Inc. 6 awardees, including HDR Aptim LLC and HDR Environmental, Operations and Construction, Inc. Top agencies EPA (Environmental Protection Agency) Navy (Department of the Navy) DHS (Department of Homeland Security)	$18,514,409	0.3%	Rank history: #44 in FY2022, #61 in FY2023 and not on the FY2024–FY2025 lists; up 31 since FY2020.
45	Ayuda MC2 JV LLC Top agencies EPA (Environmental Protection Agency)	$17,894,268	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
46	Big Sky Mobile Catering Corp Top agencies USDA (Department of Agriculture)	$17,796,949	0.3%	Rank history: not on the FY2022–FY2024 lists and #80 in FY2025; up 203 since FY2020.
47	Tli-Bay West Joint Venture, LLC Top agencies Army (Department of the Army)	$17,265,863	0.3%	Rank history: not on the FY2022–FY2025 lists; up 243 since FY2020.
48	Calista Corp 2 awardees, including Brice Environmental Services Corporation Top agencies Army (Department of the Army) DOT (Department of Transportation)	$16,630,080	0.3%	Rank history: #63 in FY2022 and not on the FY2023–FY2025 lists; down 18 since FY2020.
49	Eastern Research Group Inc. Top agencies EPA (Environmental Protection Agency) DOI (Department of the Interior) DOJ (Department of Justice)	$16,611,565	0.3%	Rank history: #42 in FY2022, #28 in FY2023, #23 in FY2024 and #34 in FY2025; down 11 since FY2020.
50	Cabrera Services Inc. Top agencies Army (Department of the Army) EPA (Environmental Protection Agency)	$15,895,654	0.2%	Rank history: #26 in FY2022 and not on the FY2023–FY2025 lists; down 13 since FY2020.
51	Lynker Corporation Top agencies Commerce (Department of Commerce)	$15,732,023	0.2%	Rank history: not on the FY2022–FY2025 lists; down 20 since FY2020.
52	Hgl-Aptim JV LLC Top agencies Army (Department of the Army) DLA (Defense Logistics Agency) EPA (Environmental Protection Agency)	$15,151,586	0.2%	Rank history: #31 in FY2022, #58 in FY2023, #33 in FY2024 and #50 in FY2025; up 66 since FY2020.
53	Paramedics Unlimited, LLC Top agencies USDA (Department of Agriculture)	$14,988,237	0.2%	Rank history: not on the FY2022–FY2025 lists; up 411 since FY2020.
54	Aero Spray Inc. Top agencies DOI (Department of the Interior)	$14,606,599	0.2%	Rank history: not on the FY2022–FY2025 lists; up 134 since FY2020.
55	Sevenson-Usa Environmental Joint Venture Top agencies Army (Department of the Army)	$14,602,334	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
56	Natives of Kodiak, Incorporated 4 awardees, including Environmental Assessment Services, LLC, Koman Government Solutions LLC and Trinity Analysis and Development Corp. Top agencies Army (Department of the Army) Navy (Department of the Navy) Commerce (Department of Commerce)	$13,999,153	0.2%	Rank history: #58 in FY2022, #64 in FY2023 and not on the FY2024–FY2025 lists; down 14 since FY2020.
57	BTP Services, LLC Top agencies DOE (Department of Energy)	$13,081,581	0.2%	Rank history: #66 in FY2022 and not on the FY2023–FY2025 lists; up 16 since FY2020.
58	R & G Food Services Inc. Top agencies USDA (Department of Agriculture)	$13,021,022	0.2%	Rank history: #91 in FY2022 and not on the FY2023–FY2025 lists; up 105 since FY2020.
59	Mmg-Tli JV, LLC Top agencies USAF (Department of the Air Force) Army (Department of the Army)	$12,949,712	0.2%	Rank history: not on the FY2022–FY2025 lists; up 171 since FY2020.
60	Tanaq-Ecm-8A JV Top agencies Army (Department of the Army) Navy (Department of the Navy)	$12,823,917	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
61	Couvillion Group LLC Top agencies DHS (Department of Homeland Security)	$12,495,506	0.2%	Rank history: #45 in FY2022, #45 in FY2023, #66 in FY2024 and #49 in FY2025; down 33 since FY2020.
62	I.m. Systems Group, Inc. Top agencies Commerce (Department of Commerce)	$12,269,257	0.2%	Rank history: not on the FY2022–FY2025 lists; down 41 since FY2020.
63	Oregon State of 4 awardees, including State of Oregon Department of Fish and Wildlife, Pacific States Marine Fisheries Commission and Oregon Dept of Agriculture Top agencies Army (Department of the Army) Commerce (Department of Commerce) DOI (Department of the Interior)	$12,250,720	0.2%	Rank history: #80 in FY2022, #55 in FY2023 and not on the FY2024–FY2025 lists; down 20 since FY2020.
64	Parsons Corporation Through Parsons Government Services Inc. Top agencies Army (Department of the Army)	$12,032,112	0.2%	Rank history: #20 in FY2022, #53 in FY2023, #73 in FY2024 and #47 in FY2025; up 4 since FY2020.
65	Waste Control Specialists LLC Top agencies DOE (Department of Energy) Army (Department of the Army) EPA (Environmental Protection Agency)	$11,911,013	0.2%	Rank history: #98 in FY2022 and not on the FY2023–FY2025 lists; up 260 since FY2020.
66	Olgoonik Corporation 2 awardees, including FPM Remediations, Inc. Top agencies Army (Department of the Army) USAF (Department of the Air Force) DHS (Department of Homeland Security)	$11,743,037	0.2%	Rank history: not on the FY2022–FY2023 lists, #67 in FY2024 and #72 in FY2025; up 414 since FY2020.
67	EQ & CH Remediation Top agencies EPA (Environmental Protection Agency)	$11,277,327	0.2%	Rank history: #97 in FY2022, #93 in FY2023, #37 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
68	Applied Research Associates, Inc. Top agencies DOI (Department of the Interior)	$11,156,790	0.2%	Rank history: not on the FY2022–FY2025 lists; up 114 since FY2020.
69	Ardl Inc. Top agencies EPA (Environmental Protection Agency) Army (Department of the Army)	$10,864,339	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
70	C M C, Inc. Top agencies EPA (Environmental Protection Agency)	$10,755,863	0.2%	Rank history: #29 in FY2022, #25 in FY2023, #41 in FY2024 and not on the FY2025 list; down 37 since FY2020.
71	Nobis Engineering, Inc. Top agencies EPA (Environmental Protection Agency) Army (Department of the Army)	$10,511,499	0.2%	Rank history: #70 in FY2022, not on the FY2023 list, #60 in FY2024 and not on the FY2025 list; up 39 since FY2020.
72	Aerostar SES LLC 2 awardees Top agencies Army (Department of the Army) Navy (Department of the Navy) HHS (Department of Health and Human Services)	$10,480,631	0.2%	Rank history: not on the FY2022–FY2025 lists; up 10 since FY2020.
73	Neptune Aviation Services, Inc. Top agencies USDA (Department of Agriculture)	$10,443,732	0.2%	Rank history: #54 in FY2022, #69 in FY2023, #35 in FY2024 and #33 in FY2025; down 44 since FY2020.
74	Ayuda Arcadis 8A Joint Venture LLC Top agencies Army (Department of the Army)	$10,356,629	0.2%	Rank history: not on the FY2022–FY2025 lists; up 188 since FY2020.
75	Leisnoi Diversified Services, LLC Top agencies EPA (Environmental Protection Agency) Navy (Department of the Navy)	$10,265,647	0.2%	Rank history: #75 in FY2022, not on the FY2023 list, #71 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
76	Paragon Professional Services LLC Top agencies DOE (Department of Energy) Army (Department of the Army)	$10,227,372	0.2%	Rank history: #90 in FY2022, #32 in FY2023, #38 in FY2024 and #29 in FY2025; up 79 since FY2020.
77	Thunder MTN Catering Inc. Top agencies USDA (Department of Agriculture)	$10,210,748	0.2%	Rank history: #71 in FY2022, not on the FY2023–FY2024 lists and #81 in FY2025; up 51 since FY2020.
78	Adventure Medics LLC Top agencies USDA (Department of Agriculture)	$10,149,613	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
79	Imperial Forestry, Incorporated Top agencies USDA (Department of Agriculture) DOI (Department of the Interior)	$10,131,003	0.2%	Rank history: #74 in FY2022, #63 in FY2023, #85 in FY2024 and #99 in FY2025; down 13 since FY2020.
80	General Dynamics Corporation 5 awardees, including General Dynamics Information Technology, Inc., Arcwood Environmental - Joplin, Inc. and Csra LLC Top agencies EPA (Environmental Protection Agency) DOS (Department of State) Commerce (Department of Commerce)	$9,918,365	0.2%	Rank history: not on the FY2022–FY2023 lists, #92 in FY2024 and not on the FY2025 list; up 70 since FY2020.
81	Four Rivers Nuclear Partnership LLC Top agencies DOE (Department of Energy)	$9,798,104	0.2%	Rank history: #85 in FY2022, #54 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
82	Leisnoi-Kemron 8A JV, LLC Top agencies Navy (Department of the Navy)	$9,769,041	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
83	Energysolutions LLC 2 awardees, including Energysolutions Services, Inc. Top agencies Navy (Department of the Navy) DOE (Department of Energy)	$9,638,386	0.1%	Rank history: #77 in FY2022 and not on the FY2023–FY2025 lists; down 29 since FY2020.
84	G E Forestry, Inc. Top agencies USDA (Department of Agriculture) DOI (Department of the Interior)	$9,423,557	0.1%	Rank history: #72 in FY2022, #87 in FY2023, #95 in FY2024 and not on the FY2025 list; up 1 since FY2020.
85	Ie-Weston Federal Services JVB LLC Top agencies Army (Department of the Army)	$9,302,904	0.1%	Rank history: not on the FY2022–FY2025 lists; up 28 since FY2020.
86	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)	$9,282,731	0.1%	Rank history: not on the FY2022–FY2025 lists; down 62 since FY2020.
87	For Stars Express, Inc. Top agencies USDA (Department of Agriculture)	$9,092,076	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
88	Summitt Forests, Inc. Top agencies USDA (Department of Agriculture) DOI (Department of the Interior)	$8,940,722	0.1%	Rank history: #67 in FY2022, #40 in FY2023 and not on the FY2024–FY2025 lists; down 25 since FY2020.
89	AECOM Technical Services, Inc. Top agencies Army (Department of the Army) DOI (Department of the Interior)	$8,936,081	0.1%	Rank history: not on the FY2022–FY2023 lists, #10 in FY2024 and #19 in FY2025; up 330 since FY2020.
90	The Solution Foundry, LLC Top agencies USAF (Department of the Air Force) Army (Department of the Army)	$8,904,080	0.1%	Rank history: #94 in FY2022, not on the FY2023–FY2024 lists and #88 in FY2025; down 32 since FY2020.
91	Ayuda-Plexus Joint Venture LLC Top agencies Army (Department of the Army)	$8,866,702	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
92	Renova Environmental Company Top agencies Army (Department of the Army) DHS (Department of Homeland Security) DOI (Department of the Interior)	$8,610,162	0.1%	Rank history: not on the FY2022–FY2025 lists; up 190 since FY2020.
93	Incident Catering Services, LLC Top agencies USDA (Department of Agriculture)	$8,601,461	0.1%	Rank history: #79 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
94	Ea-Wood-2 MP JV Top agencies Army (Department of the Army)	$8,587,052	0.1%	Rank history: not on the FY2022–FY2025 lists; up 299 since FY2020.
95	Cutting Edge Forestry, Inc. Top agencies USDA (Department of Agriculture) DOI (Department of the Interior)	$8,538,946	0.1%	Rank history: #87 in FY2022 and not on the FY2023–FY2025 lists; up 78 since FY2020.
96	Bay West LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force) DOJ (Department of Justice)	$8,384,929	0.1%	Rank history: not on the FY2022 list, #56 in FY2023, #65 in FY2024 and #53 in FY2025; down 43 since FY2020.
97	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) EPA (Environmental Protection Agency) Navy (Department of the Navy)	$8,349,998	0.1%	Rank history: #22 in FY2022 and not on the FY2023–FY2025 lists; up 15 since FY2020.
98	DAI Global LLC Top agencies USAID (US Agency for International Development)	$8,327,893	0.1%	Rank history: not on the FY2022–FY2025 lists; down 71 since FY2020.
99	Aero-Flite, Inc. Top agencies USDA (Department of Agriculture)	$8,265,977	0.1%	Rank history: not on the FY2022–FY2023 lists, #39 in FY2024 and #43 in FY2025; down 76 since FY2020.
100	Genwest Systems Inc. Top agencies Commerce (Department of Commerce)	$8,135,785	0.1%	Rank history: not on the FY2022–FY2025 lists; down 17 since FY2020.

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100 of 4,990 contractors listed here. See the rest on GovTribe.

Rankings for the codes under PSC F

Code	Net obligations	Largest contractor
F9 Natural Resources – Other Services	$2,653,709,049	AECOM
F1 Environmental Systems Protection	$1,926,090,919	Bechtel Corp
F0 Natural Resource Conservation Services	$1,522,572,045	Perimeter Solutions LP

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 $6.49 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 F contractors in FY2021?

1. AECOM ($805M), 2. Bechtel Corp ($655M), 3. Fluor Corporation ($408M), 4. Hydrogeologic, Inc. ($157M), 5. Perimeter Solutions LP ($135M), 6. Cook Inlet Region Inc. ($126M), 7. Weeks Marine Inc. ($91M), 8. Environmental Restoration LLC ($83.9M), 9. Arctic Slope Regional Corporation ($70.7M), 10. EA Engineering, Science, and Technology, Inc., PBC ($67M).

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