Top 100 Contractors in PSC F: Natural Resources Management, FY2025

Name: Top 100 Contractors in PSC F: Natural Resources Management, FY2025
Creator: GovTribe
License: https://creativecommons.org/licenses/by/4.0/

Parent companies by net contract obligations Oct 1, 2024 – Sep 30, 2025 Code page on GovTribe

The top 10 won 43% of FY2025 PSC F contract dollars

Contract obligations: $9,620,455,377 Net of deobligations, by contracts coded PSC F or a code under it
Contractors: 4,674 Parent companies with an obligation
Largest contractor: Environmental Chemical Corporation $1.92 billion, 18.9% of obligations
Data as of: Oct 23, 2026

Contract actions from FPDS (SAM.gov). How the rankings work · Download all 100 rows as CSV · Free to reuse with credit to GovTribe (CC BY 4.0)

Full ranking

Rank	Contractor	Net obligations	Share	Trend
1	Environmental Chemical Corporation 4 awardees, including ECC Constructors LLC, ECC Environmental LLC and Enviro-Fix Solutions LLC Top agencies Army (Department of the Army) DHS (Department of Homeland Security) EPA (Environmental Protection Agency)	$1,916,808,320	18.9%	Rank history: #22 in FY2021, #51 in FY2022, #26 in FY2023 and #26 in FY2024; up 25 since FY2024.
2	Amentum Holdings, Inc. 8 awardees, including United Cleanup Oak Ridge LLC, Idaho Environmental Coalition LLC and Amentum Technology, Inc. Top agencies DOE (Department of Energy) Army (Department of the Army) DOT (Department of Transportation)	$1,033,651,354	10.2%	Rank history: not on the FY2021–FY2024 lists; new.
3	Bechtel Parsons Blue Grass, A Joint Venture Top agencies Army (Department of the Army)	$289,456,116	2.9%	Rank history: not on the FY2021–FY2023 lists and #5 in FY2024; up 2 since FY2024.
4	Bechtel Corp Through Bechtel National, Inc. Top agencies Army (Department of the Army)	$237,663,874	2.3%	Rank history: #2 in FY2021, #1 in FY2022, #1 in FY2023 and #2 in FY2024; down 2 since FY2024.
5	Sevenson Environmental Services, Inc. Top agencies EPA (Environmental Protection Agency) Army (Department of the Army)	$204,425,412	2.0%	Rank history: #17 in FY2021, #6 in FY2022, #14 in FY2023 and #3 in FY2024; down 2 since FY2024.
6	Helicopter Express LLC 2 awardees, including Siller Helicopters, LLC Top agencies USDA (Department of Agriculture)	$145,649,047	1.4%	Rank history: not on the FY2021 list, #33 in FY2022, #38 in FY2023 and #18 in FY2024; up 12 since FY2024.
7	Arctic Slope Regional Corporation 5 awardees, including Environmental Quality Management, Inc., EQ & CH Remediation and EQM Services, LLC Top agencies EPA (Environmental Protection Agency) USAF (Department of the Air Force)	$145,353,612	1.4%	Rank history: #9 in FY2021, #36 in FY2022, #9 in FY2023 and #63 in FY2024; up 56 since FY2024.
8	Guidehouse Inc. 3 awardees, including Aptim Federal Services, LLC, Aptim-Amentum Alaska Decommissioning LLC and Aptim Hdr, LLC Top agencies DOE (Department of Energy) Army (Department of the Army) Navy (Department of the Navy)	$144,349,555	1.4%	Rank history: not on the FY2021–FY2023 lists and #13 in FY2024; up 5 since FY2024.
9	Hydrogeologic, Inc. Top agencies Army (Department of the Army) EPA (Environmental Protection Agency) Navy (Department of the Navy)	$134,136,866	1.3%	Rank history: #4 in FY2021, #5 in FY2022, #5 in FY2023 and #8 in FY2024; down 1 since FY2024.
10	United Cleanup Oak Ridge LLC Top agencies DOE (Department of Energy)	$132,359,640	1.3%	Rank history: not on the FY2021–FY2022 lists, #2 in FY2023 and #1 in FY2024; down 9 since FY2024.
11	Environmental Restoration LLC Top agencies EPA (Environmental Protection Agency) DOJ (Department of Justice) Army (Department of the Army)	$115,739,993	1.1%	Rank history: #8 in FY2021, #4 in FY2022, #8 in FY2023 and #20 in FY2024; up 9 since FY2024.
12	Tetra Tech, Inc. 14 awardees, including Tetra TECH EC, Inc. and Ard, Inc. Top agencies Army (Department of the Army) DOE (Department of Energy) USAID (US Agency for International Development)	$114,125,758	1.1%	Rank history: #16 in FY2021, #13 in FY2022, #17 in FY2023 and #17 in FY2024; up 5 since FY2024.
13	Helicopter Transport Services, LLC Top agencies USDA (Department of Agriculture)	$114,084,233	1.1%	Rank history: not on the FY2021 list, #11 in FY2022, #49 in FY2023 and #56 in FY2024; up 43 since FY2024.
14	Ciri Development Corporation 7 awardees, including North Wind Portage, Inc., North Wind Site Services, LLC and North Wind General Contractors LLC Top agencies DOE (Department of Energy) Army (Department of the Army) DOI (Department of the Interior)	$113,184,845	1.1%	Rank history: not on the FY2021 list, #10 in FY2022 and not on the FY2023–FY2024 lists; up 203 since FY2024.
15	EA Engineering Science and Technology Inc. PBC Top agencies EPA (Environmental Protection Agency) Army (Department of the Army) Navy (Department of the Navy)	$113,163,605	1.1%	Rank history: not on the FY2021–FY2023 lists and #7 in FY2024; down 8 since FY2024.
16	Hanford Laboratory Management and Integration LLC Top agencies DOE (Department of Energy)	$110,020,720	1.1%	Rank history: #20 in FY2021, #8 in FY2022, #10 in FY2023 and #9 in FY2024; down 7 since FY2024.
17	Idaho Environmental Coalition LLC Top agencies DOE (Department of Energy)	$84,603,000	0.8%	Rank history: not on the FY2021–FY2023 lists and #11 in FY2024; down 6 since FY2024.
18	AECOM 8 awardees, including AECOM Technical Services, Inc., URS Group, Inc. and AECOM International Inc. Top agencies Army (Department of the Army) EPA (Environmental Protection Agency) Navy (Department of the Navy)	$67,977,690	0.7%	Rank history: #1 in FY2021, #2 in FY2022, #11 in FY2023 and not on the FY2024 list; returned.
19	BWX Technologies, Inc. 2 awardees, including Nuclear Fuel Services Inc. and Bwxt Nuclear Operations Group, Inc. Top agencies DOE (Department of Energy)	$65,570,356	0.6%	Rank history: not on the FY2021 list, #35 in FY2022, #7 in FY2023 and #19 in FY2024; unchanged since FY2024.
20	Bristol Bay Native Corporation 9 awardees, including Aerostar Environmental and Construction LLC, Bristol Environmental Solutions LLC and SES Civil and Environmental LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force) DOE (Department of Energy)	$60,872,611	0.6%	Rank history: not on the FY2021–FY2022 lists, #75 in FY2023 and not on the FY2024 list; up 131 since FY2024.
21	10 Tanker Air Carrier LLC Top agencies USDA (Department of Agriculture)	$49,394,503	0.5%	Rank history: not on the FY2021–FY2023 lists and #29 in FY2024; up 8 since FY2024.
22	Navarro Research and Engineering, Inc. Top agencies DOE (Department of Energy) Army (Department of the Army)	$48,434,318	0.5%	Rank history: #18 in FY2021, #21 in FY2022, #24 in FY2023 and #27 in FY2024; up 5 since FY2024.
23	Bering Straits Native Corporation 5 awardees, including Paragon Professional Services LLC, Paragon Environmental Services, LLC and Environmental Management, Inc. Top agencies EPA (Environmental Protection Agency) Army (Department of the Army) DOE (Department of Energy)	$47,913,325	0.5%	Rank history: not on the FY2021–FY2024 lists; new.
24	L3Harris Technologies, Inc. Through Bwxt Ordnance Tennessee, Inc. Top agencies DOE (Department of Energy)	$46,800,000	0.5%	Rank history: not on the FY2021–FY2024 lists; new.
25	Oneida Environmental, LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force) DOI (Department of the Interior)	$44,382,113	0.4%	Rank history: not on the FY2021–FY2024 lists; up 101 since FY2024.
26	Calista Corp 7 awardees, including Brice Engineering, LLC, Brice Solutions, LLC and Brice Integrated LLC Top agencies Army (Department of the Army) DOT (Department of Transportation) DHS (Department of Homeland Security)	$42,711,406	0.4%	Rank history: #48 in FY2021, #63 in FY2022 and not on the FY2023–FY2024 lists; up 129 since FY2024.
27	Inmar, Inc. Through Inmar RX Solutions Inc. Top agencies HHS (Department of Health and Human Services)	$41,222,752	0.4%	Rank history: not on the FY2021–FY2024 lists; new.
28	Rotak LLC Top agencies USDA (Department of Agriculture)	$41,002,546	0.4%	Rank history: not on the FY2021–FY2022 lists, #71 in FY2023 and #52 in FY2024; up 24 since FY2024.
29	West Valley Cleanup Alliance, LLC Top agencies DOE (Department of Energy)	$40,643,286	0.4%	Rank history: not on the FY2021–FY2024 lists; new.
30	Hgl-Aptim Technologies JV LLC Top agencies Army (Department of the Army) DLA (Defense Logistics Agency) USAF (Department of the Air Force)	$39,832,642	0.4%	Rank history: not on the FY2021–FY2024 lists; new.
31	Aero Air, LLC Top agencies USDA (Department of Agriculture)	$38,532,225	0.4%	Rank history: not on the FY2021–FY2022 lists, #91 in FY2023 and #32 in FY2024; up 1 since FY2024.
32	Coulson Aviation (Usa), Inc. Top agencies USDA (Department of Agriculture)	$38,370,087	0.4%	Rank history: not on the FY2021 list, #69 in FY2022, #78 in FY2023 and #31 in FY2024; down 1 since FY2024.
33	Billings Flying Service LLC Top agencies USDA (Department of Agriculture)	$36,964,084	0.4%	Rank history: not on the FY2021 list, #19 in FY2022, #39 in FY2023 and #45 in FY2024; up 12 since FY2024.
34	Neptune Aviation Services, Inc. Top agencies USDA (Department of Agriculture) DOI (Department of the Interior)	$36,522,009	0.4%	Rank history: #73 in FY2021, #54 in FY2022, #69 in FY2023 and #35 in FY2024; up 1 since FY2024.
35	Republic Services Inc. 10 awardees, including Environmental, Safety & Health Consulting Services, Inc., US Ecology Alaska LLC and US Ecology Washington Inc. Top agencies DHS (Department of Homeland Security) Army (Department of the Army) USAF (Department of the Air Force)	$34,745,330	0.3%	Rank history: not on the FY2021–FY2024 lists; up 83 since FY2024.
36	Eastern Research Group Inc. Top agencies EPA (Environmental Protection Agency) USDA (Department of Agriculture) GSA (General Services Administration)	$33,467,594	0.3%	Rank history: #49 in FY2021, #42 in FY2022, #28 in FY2023 and #23 in FY2024; down 13 since FY2024.
37	Precision, LLC Top agencies USDA (Department of Agriculture)	$33,174,832	0.3%	Rank history: not on the FY2021–FY2023 lists and #51 in FY2024; up 14 since FY2024.
38	CDM Smith Inc. 2 awardees, including CDM Federal Programs Corporation Top agencies EPA (Environmental Protection Agency) Army (Department of the Army)	$32,116,225	0.3%	Rank history: #30 in FY2021, #28 in FY2022 and not on the FY2023–FY2024 lists; returned.
39	Leidos Holdings, Inc. 4 awardees, including Leidos, Inc. Top agencies Army (Department of the Army) DHS (Department of Homeland Security) USAF (Department of the Air Force)	$31,330,920	0.3%	Rank history: #29 in FY2021, #34 in FY2022, #31 in FY2023 and #44 in FY2024; up 5 since FY2024.
40	Tenax Aerospace LLC Top agencies USDA (Department of Agriculture)	$30,427,466	0.3%	Rank history: not on the FY2021–FY2024 lists; new.
41	Croman Corp Top agencies USDA (Department of Agriculture)	$29,716,728	0.3%	Rank history: not on the FY2021–FY2023 lists and #42 in FY2024; up 1 since FY2024.
42	Aero-Flite, Inc. Top agencies USDA (Department of Agriculture)	$29,441,669	0.3%	Rank history: #99 in FY2021, not on the FY2022–FY2023 lists and #39 in FY2024; down 3 since FY2024.
43	Sustainment & Restoration Services, LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force) Navy (Department of the Navy)	$29,391,950	0.3%	Rank history: not on the FY2021–FY2023 lists and #68 in FY2024; up 25 since FY2024.
44	Kemron Environmental Services Inc. 3 awardees, including Kemron / Arrowhead JV, LLC Top agencies EPA (Environmental Protection Agency) Navy (Department of the Navy)	$28,424,877	0.3%	Rank history: not on the FY2021–FY2023 lists and #14 in FY2024; down 30 since FY2024.
45	Capitol Helicopters, Inc. Top agencies USDA (Department of Agriculture)	$27,501,058	0.3%	Rank history: not on the FY2021–FY2023 lists and #86 in FY2024; up 41 since FY2024.
46	Parsons Corporation Through Parsons Government Services Inc. Top agencies Army (Department of the Army) MDA (DOD Missile Defense Agency)	$27,491,340	0.3%	Rank history: #64 in FY2021, #20 in FY2022, #53 in FY2023 and #73 in FY2024; up 27 since FY2024.
47	Grayback Forestry Inc. 2 awardees Top agencies USDA (Department of Agriculture) DOI (Department of the Interior)	$27,456,901	0.3%	Rank history: not on the FY2021–FY2023 lists and #72 in FY2024; up 25 since FY2024.
48	Couvillion Group LLC Top agencies DHS (Department of Homeland Security)	$26,914,727	0.3%	Rank history: #61 in FY2021, #45 in FY2022, #45 in FY2023 and #66 in FY2024; up 18 since FY2024.
49	Southern Ohio Cleanup Company LLC Top agencies DOE (Department of Energy)	$26,751,447	0.3%	Rank history: not on the FY2021–FY2024 lists; new.
50	The Aleut Corporation 4 awardees, including Aleut Environmental Remediation, LLC, Aleut Technical Services, LLC and Aleut Remediation LLC Top agencies Army (Department of the Army) EPA (Environmental Protection Agency)	$26,371,024	0.3%	Rank history: not on the FY2021–FY2024 lists; new.
51	Hgl-Aptim JV LLC Top agencies Army (Department of the Army) DLA (Defense Logistics Agency)	$25,980,808	0.3%	Rank history: #52 in FY2021, #31 in FY2022, #58 in FY2023 and #33 in FY2024; down 18 since FY2024.
52	Patrick Environmental Inc. Top agencies USDA (Department of Agriculture) DOI (Department of the Interior)	$25,820,354	0.3%	Rank history: not on the FY2021 list, #92 in FY2022, #80 in FY2023 and #69 in FY2024; up 17 since FY2024.
53	Conti Federal Services, LLC Top agencies EPA (Environmental Protection Agency)	$25,535,523	0.3%	Rank history: not on the FY2021–FY2023 lists and #54 in FY2024; up 1 since FY2024.
54	Cape Environmental Management Inc. 2 awardees, including Cape Remediation, LLC Top agencies EPA (Environmental Protection Agency) Army (Department of the Army) USAF (Department of the Air Force)	$25,233,761	0.2%	Rank history: #19 in FY2021, #15 in FY2022, #77 in FY2023 and #77 in FY2024; up 23 since FY2024.
55	Bay West LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force) DOJ (Department of Justice)	$25,082,708	0.2%	Rank history: #96 in FY2021, not on the FY2022 list, #56 in FY2023 and #65 in FY2024; up 10 since FY2024.
56	Construction Helicopters, LLC Through Helimax Aviation LLC Top agencies USDA (Department of Agriculture)	$23,870,850	0.2%	Rank history: not on the FY2021 list, #46 in FY2022, #50 in FY2023 and not on the FY2024 list; returned.
57	CPM Development Corporation Top agencies USDA (Department of Agriculture)	$23,338,728	0.2%	Rank history: not on the FY2021–FY2024 lists; new.
58	Ahtna Global LLC Top agencies Army (Department of the Army)	$22,679,903	0.2%	Rank history: not on the FY2021–FY2024 lists; up 285 since FY2024.
59	Ashbritt Inc. Top agencies Army (Department of the Army)	$22,451,832	0.2%	Rank history: not on the FY2021–FY2024 lists; new.
60	Gsia-Parsons JV LLC Top agencies Army (Department of the Army)	$22,190,054	0.2%	Rank history: not on the FY2021–FY2024 lists; new.
61	Ahtna-Brennan JV, LLC Top agencies EPA (Environmental Protection Agency)	$21,315,304	0.2%	Rank history: not on the FY2021–FY2024 lists; new.
62	Firestorm Wildland Fire Suppression, Inc. Top agencies USDA (Department of Agriculture) DOI (Department of the Interior)	$20,292,146	0.2%	Rank history: not on the FY2021 list, #68 in FY2022, #85 in FY2023 and #74 in FY2024; up 12 since FY2024.
63	Jacobs Engineering Group Inc. 6 awardees, including Jacobs Usae Joint Venture, Jacobs Government Services Company and Ch2M Hill Constructors, Inc. Top agencies EPA (Environmental Protection Agency) DECA (Defense Commissary Agency) Army (Department of the Army)	$19,273,226	0.2%	Rank history: not on the FY2021–FY2023 lists and #96 in FY2024; up 33 since FY2024.
64	Bighorn Airways Inc. Top agencies USDA (Department of Agriculture) DOI (Department of the Interior)	$18,303,185	0.2%	Rank history: not on the FY2021–FY2024 lists; up 82 since FY2024.
65	Co Fire Aviation, Inc. Top agencies DOI (Department of the Interior)	$17,914,940	0.2%	Rank history: not on the FY2021–FY2024 lists; up 46 since FY2024.
66	Arrowhead Contracting, LLC Top agencies EPA (Environmental Protection Agency)	$17,181,032	0.2%	Rank history: not on the FY2021–FY2022 lists, #44 in FY2023 and not on the FY2024 list; up 173 since FY2024.
67	Western Pilot Service Inc. Top agencies DOI (Department of the Interior) USDA (Department of Agriculture)	$16,815,205	0.2%	Rank history: not on the FY2021–FY2023 lists and #82 in FY2024; up 15 since FY2024.
68	Brink Brothers Inc. Top agencies USDA (Department of Agriculture) DOI (Department of the Interior)	$16,249,676	0.2%	Rank history: not on the FY2021–FY2022 lists, #95 in FY2023 and #34 in FY2024; down 34 since FY2024.
69	Olgoonik Corporation 2 awardees, including FPM Remediations, Inc. Top agencies USAF (Department of the Air Force) Army (Department of the Army)	$15,239,696	0.2%	Rank history: #66 in FY2021, not on the FY2022–FY2023 lists and #67 in FY2024; down 2 since FY2024.
70	Pacific OASIS Inc Top agencies USDA (Department of Agriculture) DOI (Department of the Interior)	$15,184,682	0.2%	Rank history: not on the FY2021–FY2023 lists and #75 in FY2024; up 5 since FY2024.
71	Ducks Unlimited, Inc. Top agencies Army (Department of the Army)	$15,000,000	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
72	Promethean Operating I LLC Top agencies DOI (Department of the Interior)	$14,866,119	0.1%	Rank history: not on the FY2021–FY2023 lists and #79 in FY2024; up 7 since FY2024.
73	Miller Timber Services, Inc. Top agencies USDA (Department of Agriculture) DOI (Department of the Interior)	$14,783,778	0.1%	Rank history: not on the FY2021 list, #82 in FY2022 and not on the FY2023–FY2024 lists; up 59 since FY2024.
74	Eastern Shawnee - Bay West JV, LLC Top agencies Army (Department of the Army)	$14,384,119	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
75	Heli-1 Corp Top agencies USDA (Department of Agriculture)	$14,322,679	0.1%	Rank history: not on the FY2021–FY2023 lists and #100 in FY2024; up 25 since FY2024.
76	Big Sky Mobile Catering Corp Top agencies USDA (Department of Agriculture)	$14,311,301	0.1%	Rank history: #46 in FY2021 and not on the FY2022–FY2024 lists; up 43 since FY2024.
77	Energysolutions, LLC 3 awardees, including Energysolutions Services, Inc. Top agencies EPA (Environmental Protection Agency) Navy (Department of the Navy) Army (Department of the Army)	$14,038,555	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
78	Thunder MTN Catering Inc. Top agencies USDA (Department of Agriculture)	$14,015,902	0.1%	Rank history: #77 in FY2021, #71 in FY2022 and not on the FY2023–FY2024 lists; up 51 since FY2024.
79	Ch2M Hill, Inc. Top agencies EPA (Environmental Protection Agency) Army (Department of the Army)	$13,933,638	0.1%	Rank history: not on the FY2021 list, #37 in FY2022, not on the FY2023 list and #55 in FY2024; down 24 since FY2024.
80	Clean Harbors Inc. 2 awardees, including Clean Harbors Environmental Services Inc. Top agencies USAF (Department of the Air Force) DHS (Department of Homeland Security) USDA (Department of Agriculture)	$13,668,492	0.1%	Rank history: not on the FY2021–FY2024 lists; up 155 since FY2024.
81	Spur Aviation Services, LC Top agencies USDA (Department of Agriculture) DOI (Department of the Interior)	$13,579,746	0.1%	Rank history: not on the FY2021–FY2023 lists and #80 in FY2024; down 1 since FY2024.
82	Alpine Services LLC Top agencies USDA (Department of Agriculture) DOI (Department of the Interior)	$13,342,698	0.1%	Rank history: not on the FY2021–FY2024 lists; up 86 since FY2024.
83	Houston's Too LC Top agencies USDA (Department of Agriculture)	$13,301,878	0.1%	Rank history: #40 in FY2021 and not on the FY2022–FY2024 lists; up 67 since FY2024.
84	Air Resources Helicopters, Inc. Top agencies USDA (Department of Agriculture)	$12,790,076	0.1%	Rank history: not on the FY2021–FY2024 lists; up 38 since FY2024.
85	The Solution Foundry, LLC Top agencies USAF (Department of the Air Force) Army (Department of the Army)	$12,672,426	0.1%	Rank history: #90 in FY2021, #94 in FY2022 and not on the FY2023–FY2024 lists; up 20 since FY2024.
86	Right Way Environmental Contractors, Inc. Top agencies Army (Department of the Army)	$12,510,751	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
87	Henrys Aerial Service Inc. Top agencies DOI (Department of the Interior)	$12,497,065	0.1%	Rank history: not on the FY2021–FY2024 lists; up 98 since FY2024.
88	Dynamic Aviation Group, Inc. Top agencies USDA (Department of Agriculture)	$12,385,552	0.1%	Rank history: not on the FY2021–FY2024 lists; up 85 since FY2024.
89	West Coast Reforestation Inc. Top agencies USDA (Department of Agriculture) DOI (Department of the Interior)	$12,373,391	0.1%	Rank history: not on the FY2021–FY2024 lists; up 54 since FY2024.
90	Bluesky Helicopters Inc. Top agencies USDA (Department of Agriculture)	$12,055,118	0.1%	Rank history: not on the FY2021–FY2024 lists; up 30 since FY2024.
91	C.c. Calzone, LLC Top agencies USDA (Department of Agriculture)	$11,889,490	0.1%	Rank history: not on the FY2021–FY2024 lists; up 70 since FY2024.
92	Ahtna Solutions, LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force) DOI (Department of the Interior)	$11,868,067	0.1%	Rank history: not on the FY2021–FY2022 lists, #97 in FY2023 and not on the FY2024 list; up 9 since FY2024.
93	Hillsboro Aviation Inc. Top agencies USDA (Department of Agriculture)	$11,836,805	0.1%	Rank history: not on the FY2021–FY2024 lists; up 19 since FY2024.
94	GFP Enterprises, LLC 4 awardees, including GFP Mobile Food Services, LLC, Stewart's Firefighter Food Catering, Inc. and For Stars Express, Inc. Top agencies USDA (Department of Agriculture) DOI (Department of the Interior)	$11,738,550	0.1%	Rank history: not on the FY2021–FY2024 lists; up 250 since FY2024.
95	A.i.s., Inc. Top agencies Commerce (Department of Commerce)	$11,587,266	0.1%	Rank history: not on the FY2021–FY2023 lists and #93 in FY2024; down 2 since FY2024.
96	Seaon Environmental LLC Top agencies Navy (Department of the Navy)	$11,551,197	0.1%	Rank history: not on the FY2021–FY2024 lists; up 27 since FY2024.
97	Imperial Forestry, Incorporated Top agencies USDA (Department of Agriculture) DOI (Department of the Interior)	$11,286,306	0.1%	Rank history: #79 in FY2021, #74 in FY2022, #63 in FY2023 and #85 in FY2024; down 12 since FY2024.
98	New Frontier Aviation, LLC Top agencies DOI (Department of the Interior)	$11,275,002	0.1%	Rank history: not on the FY2021–FY2024 lists; up 32 since FY2024.
99	Noreas Environmental Services LLC Top agencies Army (Department of the Army)	$11,267,164	0.1%	Rank history: not on the FY2021–FY2024 lists; up 8 since FY2024.
100	Kit Helicopter Operations LLC Top agencies USDA (Department of Agriculture)	$11,200,140	0.1%	Rank history: not on the FY2021–FY2024 lists; up 109 since FY2024.

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100 of 4,674 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	$4,453,882,475	Environmental Chemical Corporation
F1 Environmental Systems Protection	$2,603,659,126	Bechtel Parsons Blue Grass, A Joint Venture
F0 Natural Resource Conservation Services	$2,562,913,776	Helicopter Express LLC

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 $10.1 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. An awardee whose own actions mostly name no parent, and that no other company's actions name as their parent, rolls up its SAM.gov registration's chain of parent companies: it counts under the first company there that other companies' actions name as their parent, or under the parent most of a company's own actions name, whichever comes first; with neither, under the highest company in the chain with federal contracts of its own. Joint ventures stay companies of their own. 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

Who were the top 10 PSC F contractors in FY2025?

1. Environmental Chemical Corporation ($1.92B), 2. Amentum Holdings, Inc. ($1.03B), 3. Bechtel Parsons Blue Grass, A Joint Venture ($289M), 4. Bechtel Corp ($238M), 5. Sevenson Environmental Services, Inc. ($204M), 6. Helicopter Express LLC ($146M), 7. Arctic Slope Regional Corporation ($145M), 8. Guidehouse Inc. ($144M), 9. Hydrogeologic, Inc. ($134M), 10. United Cleanup Oak Ridge LLC ($132M).

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Open opportunities they're positioned for
Alerts when they win new work

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