Top 100 Contractors in PSC F: Natural Resources Management, FY2023

Name: Top 100 Contractors in PSC F: Natural Resources Management, FY2023
Creator: GovTribe

Parent companies by net contract obligations Oct 1, 2022 – Sep 30, 2023 Code page on GovTribe

The top 10 won 33% of FY2023 PSC F contract dollars

Contract obligations: $7,858,350,450 Net of deobligations, by contracts coded PSC F or a code under it
Contractors: 5,010 Parent companies with an obligation
Largest contractor: Bechtel Corp $838 million, 10.0% 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	Bechtel Corp 3 awardees, including Bechtel Parsons Blue Grass, A Joint Venture and Bechtel National, Inc. Top agencies Army (Department of the Army) Navy (Department of the Navy)	$838,424,227	10.0%	Rank history: #2 in FY2021, #1 in FY2022, #2 in FY2024 and #4 in FY2025; unchanged since FY2022.
2	United Cleanup Oak Ridge LLC Top agencies DOE (Department of Energy)	$752,637,900	8.9%	Rank history: not on the FY2021–FY2022 lists, #1 in FY2024 and #9 in FY2025; new.
3	Jacobs Engineering Group Inc. 7 awardees, including Amentum Technology, Inc., Idaho Environmental Coalition LLC and Ch2M Hill, Inc. Top agencies Army (Department of the Army) DOE (Department of Energy) EPA (Environmental Protection Agency)	$239,173,921	2.8%	Rank history: #13 in FY2021, #30 in FY2022, #4 in FY2024 and not on the FY2025 list; up 27 since FY2022.
4	EA Engineering, Science, and Technology, Inc., PBC Top agencies Army (Department of the Army) EPA (Environmental Protection Agency) USAF (Department of the Air Force)	$218,305,652	2.6%	Rank history: #10 in FY2021, #3 in FY2022 and not on the FY2024–FY2025 lists; down 1 since FY2022.
5	Hydrogeologic, Inc. Top agencies Army (Department of the Army) EPA (Environmental Protection Agency) USAF (Department of the Air Force)	$177,109,382	2.1%	Rank history: #4 in FY2021, #5 in FY2022, #8 in FY2024 and #8 in FY2025; unchanged since FY2022.
6	Aptim Federal Services LLC 2 awardees Top agencies DOE (Department of Energy) Navy (Department of the Navy) EPA (Environmental Protection Agency)	$131,857,201	1.6%	Rank history: #34 in FY2021, #17 in FY2022 and not on the FY2024–FY2025 lists; up 11 since FY2022.
7	BWX Technologies, Inc. 2 awardees, including Nuclear Fuel Services Inc. and Bwxt Nuclear Operations Group, Inc. Top agencies DOE (Department of Energy)	$111,160,776	1.3%	Rank history: not on the FY2021 list, #35 in FY2022, #19 in FY2024 and #18 in FY2025; up 28 since FY2022.
8	Environmental Restoration LLC Top agencies EPA (Environmental Protection Agency) DOJ (Department of Justice)	$99,961,285	1.2%	Rank history: #8 in FY2021, #4 in FY2022, #20 in FY2024 and #10 in FY2025; down 4 since FY2022.
9	Arctic Slope Regional Corporation 2 awardees, including Environmental Quality Management, Inc. and EQM Services, LLC Top agencies EPA (Environmental Protection Agency) Army (Department of the Army) USAF (Department of the Air Force)	$89,786,807	1.1%	Rank history: #9 in FY2021, #36 in FY2022, #63 in FY2024 and #6 in FY2025; up 27 since FY2022.
10	Hanford Laboratory Management and Integration LLC Top agencies DOE (Department of Energy)	$85,471,763	1.0%	Rank history: #20 in FY2021, #8 in FY2022, #9 in FY2024 and #13 in FY2025; down 2 since FY2022.
11	AECOM 10 awardees, including AECOM Technical Services, Inc., URS Group, Inc. and Amentum Environment & Energy, Inc. Top agencies EPA (Environmental Protection Agency) Army (Department of the Army) DOT (Department of Transportation)	$76,743,549	0.9%	Rank history: #1 in FY2021, #2 in FY2022 and not on the FY2024–FY2025 lists; down 9 since FY2022.
12	Brice Engineering, LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force) DHS (Department of Homeland Security)	$74,567,801	0.9%	Rank history: #43 in FY2021, #25 in FY2022, #47 in FY2024 and #40 in FY2025; up 13 since FY2022.
13	Nelson Environmental Remediation USA Ltd Top agencies USAID (US Agency for International Development)	$71,013,106	0.8%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
14	Sevenson Environmental Services, Inc. Top agencies Army (Department of the Army) EPA (Environmental Protection Agency)	$68,774,121	0.8%	Rank history: #17 in FY2021, #6 in FY2022, #3 in FY2024 and #5 in FY2025; down 8 since FY2022.
15	Aptim-Amentum Alaska Decommissioning LLC Top agencies Army (Department of the Army)	$65,253,684	0.8%	Rank history: not on the FY2021–FY2022 lists, #25 in FY2024 and not on the FY2025 list; new.
16	Perimeter Solutions LP Top agencies USDA (Department of Agriculture) DOI (Department of the Interior)	$65,088,030	0.8%	Rank history: #5 in FY2021, #12 in FY2022 and not on the FY2024–FY2025 lists; down 4 since FY2022.
17	Tetra Tech, Inc. 19 awardees, including Tetra TECH EC, Inc. and Ard, Inc. Top agencies Army (Department of the Army) USAID (US Agency for International Development) EPA (Environmental Protection Agency)	$62,776,724	0.7%	Rank history: #16 in FY2021, #13 in FY2022, #17 in FY2024 and #14 in FY2025; down 4 since FY2022.
18	Cook Inlet Region Inc. 5 awardees, including North Wind Portage, Inc. and North Wind Site Services LLC Top agencies DOE (Department of Energy) Army (Department of the Army)	$57,807,853	0.7%	Rank history: #6 in FY2021, #9 in FY2022, #30 in FY2024 and not on the FY2025 list; down 9 since FY2022.
19	Tenax Aerospace Holdings LLC Through Tenax Aerospace LLC Top agencies USDA (Department of Agriculture)	$53,976,709	0.6%	Rank history: not on the FY2021 list, #27 in FY2022 and not on the FY2024–FY2025 lists; up 8 since FY2022.
20	Fpm-Aecom JV1 Top agencies Army (Department of the Army) USAF (Department of the Air Force) DOE (Department of Energy)	$52,014,253	0.6%	Rank history: not on the FY2021 list, #88 in FY2022, #50 in FY2024 and not on the FY2025 list; up 68 since FY2022.
21	Oneida Nation 4 awardees, including Sustainment & Restoration Services, LLC, OCH JV and Oneida Total Integrated Enterprises LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force) EPA (Environmental Protection Agency)	$51,892,738	0.6%	Rank history: #21 in FY2021, #16 in FY2022, #94 in FY2024 and not on the FY2025 list; down 5 since FY2022.
22	CDM Smith Inc Through CDM Federal Programs Corporation Top agencies EPA (Environmental Protection Agency)	$49,756,139	0.6%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
23	Aptim AECOM Decommissioning, LLC Top agencies Army (Department of the Army)	$48,732,607	0.6%	Rank history: #25 in FY2021, not on the FY2022 list and not on the FY2024–FY2025 lists; returned.
24	Navarro Research and Engineering, Inc. Top agencies DOE (Department of Energy) Army (Department of the Army) USAF (Department of the Air Force)	$46,059,969	0.5%	Rank history: #18 in FY2021, #21 in FY2022, #27 in FY2024 and #21 in FY2025; down 3 since FY2022.
25	C M C, Inc. Top agencies EPA (Environmental Protection Agency)	$42,663,299	0.5%	Rank history: #70 in FY2021, #29 in FY2022, #41 in FY2024 and not on the FY2025 list; up 4 since FY2022.
26	Environmental Chemical Corporation 4 awardees, including ECC Environmental LLC Top agencies Army (Department of the Army) MDA (DOD Missile Defense Agency) USAF (Department of the Air Force)	$40,255,963	0.5%	Rank history: #22 in FY2021, #51 in FY2022, #26 in FY2024 and #37 in FY2025; up 25 since FY2022.
27	Kemron / Arrowhead JV, LLC Top agencies EPA (Environmental Protection Agency)	$39,785,837	0.5%	Rank history: not on the FY2021 list, #47 in FY2022 and not on the FY2024–FY2025 lists; up 20 since FY2022.
28	Eastern Research Group Inc. Top agencies EPA (Environmental Protection Agency) USDA (Department of Agriculture) GSA (General Services Administration)	$38,653,993	0.5%	Rank history: #49 in FY2021, #42 in FY2022, #23 in FY2024 and #34 in FY2025; up 14 since FY2022.
29	J W Bamford Inc Through J.w. Bamford, Inc. Top agencies USDA (Department of Agriculture)	$36,600,320	0.4%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 367 since FY2022.
30	AECOM Arcadis Pfas JV Top agencies Army (Department of the Army)	$36,446,227	0.4%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
31	Leidos Holdings, Inc. 4 awardees, including Leidos, Inc. and Leidos-Cdm Solutions LLC Top agencies DHS (Department of Homeland Security) Army (Department of the Army) DOE (Department of Energy)	$34,774,969	0.4%	Rank history: #29 in FY2021, #34 in FY2022, #44 in FY2024 and #39 in FY2025; up 3 since FY2022.
32	Paragon Professional Services LLC Top agencies DOE (Department of Energy) EPA (Environmental Protection Agency) Army (Department of the Army)	$32,058,997	0.4%	Rank history: #76 in FY2021, #90 in FY2022, #38 in FY2024 and #29 in FY2025; up 58 since FY2022.
33	Amentum Services, Inc. Top agencies Army (Department of the Army) DHS (Department of Homeland Security)	$31,701,841	0.4%	Rank history: not on the FY2021 list, #23 in FY2022 and not on the FY2024–FY2025 lists; down 10 since FY2022.
34	Cape Remediation, LLC Top agencies EPA (Environmental Protection Agency) Army (Department of the Army)	$30,717,369	0.4%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
35	Burnbot Inc. Top agencies USDA (Department of Agriculture)	$30,545,428	0.4%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
36	Veterans Holding Group LLC Through Relyant Global LLC Top agencies Army (Department of the Army)	$29,776,456	0.4%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
37	Inmar Clearing Inc. Through Inmar RX Solutions Inc. Top agencies HHS (Department of Health and Human Services)	$29,565,120	0.4%	Rank history: not on the FY2021–FY2022 lists, #40 in FY2024 and not on the FY2025 list; new.
38	Helicopter Express LLC Top agencies USDA (Department of Agriculture)	$28,384,846	0.3%	Rank history: not on the FY2021 list, #33 in FY2022, #18 in FY2024 and #15 in FY2025; down 5 since FY2022.
39	Billings Flying Service LLC Top agencies USDA (Department of Agriculture)	$27,919,253	0.3%	Rank history: not on the FY2021 list, #19 in FY2022, #45 in FY2024 and #32 in FY2025; down 20 since FY2022.
40	Summitt Forests, Inc. Top agencies USDA (Department of Agriculture) DOI (Department of the Interior)	$27,398,451	0.3%	Rank history: #88 in FY2021, #67 in FY2022 and not on the FY2024–FY2025 lists; up 27 since FY2022.
41	10 Tanker Air Carrier, LLC Top agencies USDA (Department of Agriculture)	$27,366,213	0.3%	Rank history: not on the FY2021 list, #55 in FY2022 and not on the FY2024–FY2025 lists; up 14 since FY2022.
42	Kemron Environmental Services, Inc. Top agencies EPA (Environmental Protection Agency) Army (Department of the Army)	$26,500,292	0.3%	Rank history: #26 in FY2021, #32 in FY2022 and not on the FY2024–FY2025 lists; down 10 since FY2022.
43	Pika-Insight JV LLC Top agencies Army (Department of the Army) Navy (Department of the Navy)	$26,017,594	0.3%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
44	Arrowhead Contracting, LLC Top agencies EPA (Environmental Protection Agency)	$25,843,246	0.3%	Rank history: not on the FY2021–FY2022 lists, not on the FY2024 list and #68 in FY2025; new.
45	Couvillion Group LLC Top agencies DHS (Department of Homeland Security)	$25,724,737	0.3%	Rank history: #61 in FY2021, #45 in FY2022, #66 in FY2024 and #49 in FY2025; unchanged since FY2022.
46	Siller Helicopters, LLC Top agencies USDA (Department of Agriculture)	$25,717,364	0.3%	Rank history: not on the FY2021 list, #41 in FY2022, #57 in FY2024 and #24 in FY2025; down 5 since FY2022.
47	Northwind-Jacobs Joint Venture Top agencies Army (Department of the Army)	$25,396,678	0.3%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 170 since FY2022.
48	Croman Corp Top agencies USDA (Department of Agriculture)	$25,002,159	0.3%	Rank history: not on the FY2021 list, #39 in FY2022 and not on the FY2024–FY2025 lists; down 9 since FY2022.
49	Helicopter Transport Services, LLC Top agencies USDA (Department of Agriculture)	$23,798,685	0.3%	Rank history: not on the FY2021 list, #11 in FY2022, #56 in FY2024 and #11 in FY2025; down 38 since FY2022.
50	Construction Helicopters, LLC 2 awardees, including Helimax Aviation LLC Top agencies USDA (Department of Agriculture)	$23,518,989	0.3%	Rank history: not on the FY2021 list, #46 in FY2022 and not on the FY2024–FY2025 lists; down 4 since FY2022.
51	Asrc Consulting & Environmental Services LLC Top agencies DOI (Department of the Interior) DOE (Department of Energy)	$23,495,877	0.3%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
52	Jacobs Government Services Company Top agencies Army (Department of the Army)	$23,114,189	0.3%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
53	Parsons Corporation Through Parsons Government Services Inc. Top agencies Army (Department of the Army) MDA (DOD Missile Defense Agency) OSD (Office of the Secretary of Defense)	$21,724,609	0.3%	Rank history: #64 in FY2021, #20 in FY2022, #73 in FY2024 and #47 in FY2025; down 33 since FY2022.
54	Four Rivers Nuclear Partnership LLC Top agencies DOE (Department of Energy)	$21,683,615	0.3%	Rank history: #81 in FY2021, #85 in FY2022 and not on the FY2024–FY2025 lists; up 31 since FY2022.
55	Oregon State of 7 awardees, including State of Oregon Department of Fish and Wildlife, Pacific States Marine Fisheries Commission and Oregon Department of Forestry Top agencies Army (Department of the Army) Commerce (Department of Commerce) USDA (Department of Agriculture)	$21,511,569	0.3%	Rank history: #63 in FY2021, #80 in FY2022 and not on the FY2024–FY2025 lists; up 25 since FY2022.
56	Bay West LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force) EPA (Environmental Protection Agency)	$21,104,539	0.3%	Rank history: #96 in FY2021, not on the FY2022 list, #65 in FY2024 and #53 in FY2025; up 57 since FY2022.
57	Sol Solutions, LLC Top agencies Army (Department of the Army) Navy (Department of the Navy)	$20,775,287	0.2%	Rank history: #35 in FY2021, #52 in FY2022 and not on the FY2024–FY2025 lists; down 5 since FY2022.
58	Hgl-Aptim JV LLC Top agencies Army (Department of the Army) DLA (Defense Logistics Agency)	$20,198,109	0.2%	Rank history: #52 in FY2021, #31 in FY2022, #33 in FY2024 and #50 in FY2025; down 27 since FY2022.
59	Grayback Forestry, Inc. Top agencies USDA (Department of Agriculture) DOI (Department of the Interior)	$19,031,592	0.2%	Rank history: not on the FY2021 list, #64 in FY2022 and not on the FY2024–FY2025 lists; up 5 since FY2022.
60	Ahtna-Arcadis 8(A) JV, LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$18,959,648	0.2%	Rank history: not on the FY2021–FY2022 lists, #61 in FY2024 and not on the FY2025 list; new.
61	Hdr, Inc. 4 awardees, including HDR Aptim LLC and HDR Environmental, Operations and Construction, Inc. Top agencies EPA (Environmental Protection Agency) Navy (Department of the Navy) Army (Department of the Army)	$18,826,393	0.2%	Rank history: #44 in FY2021, #44 in FY2022 and not on the FY2024–FY2025 lists; down 17 since FY2022.
62	Ahtna, Incorporated 3 awardees, including Ahtna Global LLC, Ahtna Engineering Services, LLC and Ahtna Environmental, Inc. Top agencies Army (Department of the Army) USAF (Department of the Air Force) DOT (Department of Transportation)	$18,674,832	0.2%	Rank history: #32 in FY2021, #81 in FY2022 and not on the FY2024–FY2025 lists; up 19 since FY2022.
63	Imperial Forestry, Incorporated Top agencies USDA (Department of Agriculture) DOI (Department of the Interior)	$18,633,738	0.2%	Rank history: #79 in FY2021, #74 in FY2022, #85 in FY2024 and #99 in FY2025; up 11 since FY2022.
64	Natives of Kodiak, Incorporated 2 awardees, including Koman Government Solutions LLC and Environmental Assessment Services, LLC Top agencies Army (Department of the Army) Navy (Department of the Navy) USAF (Department of the Air Force)	$17,792,055	0.2%	Rank history: #56 in FY2021, #58 in FY2022 and not on the FY2024–FY2025 lists; down 6 since FY2022.
65	Weston Solutions Holdings, Inc. 2 awardees, including Weston Solutions Inc. Top agencies EPA (Environmental Protection Agency) Army (Department of the Army)	$17,782,635	0.2%	Rank history: #38 in FY2021, #43 in FY2022, #46 in FY2024 and not on the FY2025 list; down 22 since FY2022.
66	Mark Cerrone, Inc. Top agencies Army (Department of the Army)	$17,553,000	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
67	Markit! Forestry Management LLC Top agencies USDA (Department of Agriculture) DOI (Department of the Interior)	$17,391,386	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 292 since FY2022.
68	US Ecology, Inc. 6 awardees, including US Ecology Holdings, Inc., NRC Environmental Services Inc. and NRC Gulf Environmental Services Inc. Top agencies Army (Department of the Army) DHS (Department of Homeland Security) DLA (Defense Logistics Agency)	$16,975,736	0.2%	Rank history: not on the FY2021 list, #49 in FY2022 and not on the FY2024–FY2025 lists; down 19 since FY2022.
69	Neptune Aviation Services, Inc. Top agencies USDA (Department of Agriculture)	$16,365,931	0.2%	Rank history: #73 in FY2021, #54 in FY2022, #35 in FY2024 and #33 in FY2025; down 15 since FY2022.
70	Weeks Marine Inc. Top agencies Commerce (Department of Commerce)	$16,249,599	0.2%	Rank history: #7 in FY2021, #76 in FY2022 and not on the FY2024–FY2025 lists; up 6 since FY2022.
71	Rotak LLC Top agencies USDA (Department of Agriculture)	$15,894,335	0.2%	Rank history: not on the FY2021–FY2022 lists, #52 in FY2024 and #26 in FY2025; up 98 since FY2022.
72	Brice-Aecom JV1 Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$15,554,451	0.2%	Rank history: #23 in FY2021, not on the FY2022 list and not on the FY2024–FY2025 lists; up 39 since FY2022.
73	Native Hawaiian Community Development Corporation 3 awardees, including GSI North America Inc. Top agencies Army (Department of the Army) USAF (Department of the Air Force) EPA (Environmental Protection Agency)	$15,475,147	0.2%	Rank history: not on the FY2021 list, #96 in FY2022 and not on the FY2024–FY2025 lists; up 23 since FY2022.
74	Weston-Techlaw JV LLC Top agencies EPA (Environmental Protection Agency)	$15,452,244	0.2%	Rank history: not on the FY2021–FY2022 lists, #89 in FY2024 and not on the FY2025 list; up 76 since FY2022.
75	Bristol Bay Native Corporation 4 awardees, including Bristol Environmental Solutions LLC, Specpro Professional Services, LLC and Bristol Site Contractors, LLC Top agencies Army (Department of the Army)	$15,078,722	0.2%	Rank history: not on the FY2021–FY2022 lists, not on the FY2024 list and #62 in FY2025; new.
76	Management & Engineering Technologies International Inc. Top agencies USDA (Department of Agriculture)	$15,041,467	0.2%	Rank history: #33 in FY2021, #18 in FY2022 and not on the FY2024–FY2025 lists; down 58 since FY2022.
77	Cape Environmental Management Inc. Top agencies Navy (Department of the Navy) Army (Department of the Army) USAF (Department of the Air Force)	$14,948,155	0.2%	Rank history: #19 in FY2021, #15 in FY2022, #77 in FY2024 and #65 in FY2025; down 62 since FY2022.
78	Coulson Aviation (Usa), Inc. Top agencies USDA (Department of Agriculture)	$14,504,079	0.2%	Rank history: not on the FY2021 list, #69 in FY2022, #31 in FY2024 and #31 in FY2025; down 9 since FY2022.
79	Environmental Rail Solutions Inc. Top agencies Army (Department of the Army)	$14,453,363	0.2%	Rank history: not on the FY2021–FY2022 lists, #70 in FY2024 and not on the FY2025 list; up 42 since FY2022.
80	Patrick Environmental Inc. Top agencies USDA (Department of Agriculture) DOI (Department of the Interior)	$14,270,687	0.2%	Rank history: not on the FY2021 list, #92 in FY2022, #69 in FY2024 and #51 in FY2025; up 12 since FY2022.
81	Skeo Solutions, Inc. Top agencies EPA (Environmental Protection Agency)	$14,174,969	0.2%	Rank history: not on the FY2021 list, #59 in FY2022, #83 in FY2024 and not on the FY2025 list; down 22 since FY2022.
82	Crawford Bros., Inc. Top agencies USDA (Department of Agriculture)	$14,121,491	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
83	Research Triangle Institute Top agencies EPA (Environmental Protection Agency)	$14,117,439	0.2%	Rank history: not on the FY2021 list, #95 in FY2022, #97 in FY2024 and not on the FY2025 list; up 12 since FY2022.
84	A and M Engineering & Environmental Services Inc Top agencies EPA (Environmental Protection Agency)	$13,920,364	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
85	Firestorm Wildland Fire Suppression, Inc. Top agencies USDA (Department of Agriculture) DOI (Department of the Interior)	$13,856,717	0.2%	Rank history: not on the FY2021 list, #68 in FY2022, #74 in FY2024 and #63 in FY2025; down 17 since FY2022.
86	ST George Tanaq Corp 3 awardees, including Tanaq Environmental LLC and Heliotech Top agencies Army (Department of the Army) EPA (Environmental Protection Agency) USAF (Department of the Air Force)	$13,661,087	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 23 since FY2022.
87	G E Forestry, Inc. Top agencies USDA (Department of Agriculture) DOI (Department of the Interior)	$13,647,651	0.2%	Rank history: #84 in FY2021, #72 in FY2022, #95 in FY2024 and not on the FY2025 list; down 15 since FY2022.
88	Erickson Incorporated Top agencies USDA (Department of Agriculture)	$13,336,527	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 39 since FY2022.
89	Black Knight Enterprises Inc. Top agencies USDA (Department of Agriculture)	$13,170,064	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
90	SES Civil and Environmental LLC Top agencies USAF (Department of the Air Force) Army (Department of the Army) Navy (Department of the Navy)	$13,158,556	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 12 since FY2022.
91	Aero Air, LLC Top agencies USDA (Department of Agriculture)	$13,127,448	0.2%	Rank history: not on the FY2021–FY2022 lists, #32 in FY2024 and #30 in FY2025; new.
92	Confederated Salish and Kootenai Tribes 3 awardees, including S&K Mission Support, LLC, S & K Logistics Services LLC and S & K Federal Services LLC Top agencies DOE (Department of Energy)	$12,856,248	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 130 since FY2022.
93	EQ & CH Remediation Top agencies EPA (Environmental Protection Agency)	$12,831,525	0.2%	Rank history: #67 in FY2021, #97 in FY2022, #37 in FY2024 and not on the FY2025 list; up 4 since FY2022.
94	The Texas A&M University System 5 awardees, including Texas A & M University Kingsville, Texas A&M Transportation Institute and Texas A & M University At Galveston Top agencies DOI (Department of the Interior) Commerce (Department of Commerce)	$12,790,221	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
95	Brink Brothers Inc. Top agencies USDA (Department of Agriculture)	$12,700,824	0.2%	Rank history: not on the FY2021–FY2022 lists, #34 in FY2024 and #71 in FY2025; new.
96	Brice Solutions, LLC Top agencies DOT (Department of Transportation) DHS (Department of Homeland Security) Army (Department of the Army)	$12,686,854	0.2%	Rank history: not on the FY2021–FY2022 lists, #59 in FY2024 and not on the FY2025 list; up 136 since FY2022.
97	Ahtna Solutions, LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force) DOT (Department of Transportation)	$12,497,161	0.1%	Rank history: not on the FY2021–FY2022 lists, not on the FY2024 list and #95 in FY2025; up 20 since FY2022.
98	Engineering / Remediation Resources Group, Inc. 3 awardees Top agencies Army (Department of the Army) Navy (Department of the Navy) USDA (Department of Agriculture)	$12,188,853	0.1%	Rank history: not on the FY2021 list, #73 in FY2022 and not on the FY2024–FY2025 lists; down 25 since FY2022.
99	Seres-Arcadis SB JV, LLC Top agencies Army (Department of the Army)	$12,110,082	0.1%	Rank history: not on the FY2021–FY2022 lists, #87 in FY2024 and not on the FY2025 list; up 34 since FY2022.
100	Enviro-Fix Solutions LLC Top agencies Army (Department of the Army)	$11,984,342	0.1%	Rank history: not on the FY2021–FY2022 lists, #84 in FY2024 and #73 in FY2025; new.

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100 of 5,010 contractors listed here. See the rest on GovTribe.

Rankings for the codes under PSC F

Code	Net obligations	Largest contractor
F1 Environmental Systems Protection	$2,973,111,620	Bechtel Corp
F9 Natural Resources – Other Services	$2,643,600,790	United Cleanup Oak Ridge LLC
F0 Natural Resource Conservation Services	$2,241,638,041	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 $8.42 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 2023 ran Oct 1, 2022 – Sep 30, 2023. 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 FY2022. "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 FY2022 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 FY2023?

1. Bechtel Corp ($838M), 2. United Cleanup Oak Ridge LLC ($753M), 3. Jacobs Engineering Group Inc. ($239M), 4. EA Engineering, Science, and Technology, Inc., PBC ($218M), 5. Hydrogeologic, Inc. ($177M), 6. Aptim Federal Services LLC ($132M), 7. BWX Technologies, Inc. ($111M), 8. Environmental Restoration LLC ($100M), 9. Arctic Slope Regional Corporation ($89.8M), 10. Hanford Laboratory Management and Integration LLC ($85.5M).

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