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

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

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: $9,618,730,868 Net of deobligations, by contracts coded PSC F or a code under it
Contractors: 4,752 Parent companies with an obligation
Largest contractor: ECC Constructors LLC $1.85 billion, 18.3% 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	ECC Constructors LLC Top agencies Army (Department of the Army) DHS (Department of Homeland Security)	$1,852,409,055	18.3%	Rank history: not on the FY2021–FY2023 lists and #28 in FY2024; up 27 since FY2024.
2	Amentum Holdings, Inc. 9 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)	$1,060,402,801	10.5%	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	Arctic Slope Regional Corporation 2 awardees, including Environmental Quality Management, Inc. Top agencies EPA (Environmental Protection Agency) USAF (Department of the Air Force)	$144,024,889	1.4%	Rank history: #9 in FY2021, #36 in FY2022, #9 in FY2023 and #63 in FY2024; up 57 since FY2024.
7	Guidehouse Inc. Through Aptim Federal Services, LLC Top agencies DOE (Department of Energy) Army (Department of the Army) Navy (Department of the Navy)	$140,033,455	1.4%	Rank history: not on the FY2021–FY2023 lists and #13 in FY2024; up 6 since FY2024.
8	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; unchanged since FY2024.
9	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 8 since FY2024.
10	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 10 since FY2024.
11	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 45 since FY2024.
12	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 5 since FY2024.
13	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 4 since FY2024.
14	Tetra Tech, Inc. 11 awardees, including Tetra TECH EC, Inc. and Ard, Inc. Top agencies Army (Department of the Army) USAID (US Agency for International Development) Navy (Department of the Navy)	$107,416,993	1.1%	Rank history: #16 in FY2021, #13 in FY2022, #17 in FY2023 and #17 in FY2024; up 3 since FY2024.
15	Helicopter Express LLC Top agencies USDA (Department of Agriculture)	$102,458,350	1.0%	Rank history: not on the FY2021 list, #33 in FY2022, #38 in FY2023 and #18 in FY2024; up 3 since FY2024.
16	North Wind Portage, Inc. Top agencies DOE (Department of Energy) Army (Department of the Army)	$96,054,536	0.9%	Rank history: not on the FY2021 list, #24 in FY2022, not on the FY2023 list and #16 in FY2024; unchanged 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	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; up 1 since FY2024.
19	AECOM Technical Services, Inc. Top agencies Army (Department of the Army) EPA (Environmental Protection Agency) Navy (Department of the Navy)	$60,763,993	0.6%	Rank history: #89 in FY2021, not on the FY2022–FY2023 lists and #10 in FY2024; down 9 since FY2024.
20	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 9 since FY2024.
21	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 6 since FY2024.
22	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.
23	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 103 since FY2024.
24	Siller Helicopters, LLC Top agencies USDA (Department of Agriculture)	$43,190,696	0.4%	Rank history: not on the FY2021 list, #41 in FY2022, #46 in FY2023 and #57 in FY2024; up 33 since FY2024.
25	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.
26	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 26 since FY2024.
27	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.
28	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.
29	Paragon Professional Services LLC Top agencies Army (Department of the Army) DOE (Department of Energy) EPA (Environmental Protection Agency)	$39,831,587	0.4%	Rank history: #76 in FY2021, #90 in FY2022, #32 in FY2023 and #38 in FY2024; up 9 since FY2024.
30	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 2 since FY2024.
31	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; unchanged since FY2024.
32	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 13 since FY2024.
33	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 2 since FY2024.
34	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 11 since FY2024.
35	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 16 since FY2024.
36	Republic Services Inc. 7 awardees, including Environmental, Safety & Health Consulting Services, Inc., US Ecology Washington Inc. and National Response Corporation Top agencies DHS (Department of Homeland Security) Army (Department of the Army) Navy (Department of the Navy)	$32,894,022	0.3%	Rank history: not on the FY2021–FY2024 lists; up 82 since FY2024.
37	Environmental Chemical Corporation Top agencies Army (Department of the Army) USAF (Department of the Air Force) GSA (General Services Administration)	$32,105,859	0.3%	Rank history: #22 in FY2021, #51 in FY2022, #26 in FY2023 and #26 in FY2024; down 11 since FY2024.
38	CDM Federal Programs Corporation Top agencies EPA (Environmental Protection Agency)	$31,981,169	0.3%	Rank history: not on the FY2021–FY2023 lists and #36 in FY2024; down 2 since FY2024.
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	Brice Engineering, LLC Top agencies Army (Department of the Army) DHS (Department of Homeland Security) USAF (Department of the Air Force)	$31,180,139	0.3%	Rank history: #43 in FY2021, #25 in FY2022, #12 in FY2023 and #47 in FY2024; up 7 since FY2024.
41	Tenax Aerospace LLC Top agencies USDA (Department of Agriculture)	$30,427,466	0.3%	Rank history: not on the FY2021–FY2024 lists; new.
42	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; unchanged since FY2024.
43	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 4 since FY2024.
44	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 24 since FY2024.
45	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 31 since FY2024.
46	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 40 since FY2024.
47	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 26 since FY2024.
48	Grayback Forestry Inc. Top agencies USDA (Department of Agriculture) DOI (Department of the Interior)	$27,090,955	0.3%	Rank history: not on the FY2021–FY2023 lists and #72 in FY2024; up 24 since FY2024.
49	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 17 since FY2024.
50	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 17 since FY2024.
51	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 18 since FY2024.
52	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 2 since FY2024.
53	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 12 since FY2024.
54	Helimax Aviation LLC Top agencies USDA (Department of Agriculture)	$23,870,850	0.2%	Rank history: not on the FY2021–FY2023 lists and #62 in FY2024; up 8 since FY2024.
55	CPM Development Corporation Top agencies USDA (Department of Agriculture)	$23,338,728	0.2%	Rank history: not on the FY2021–FY2024 lists; new.
56	Aerostar Environmental and Construction LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force) Navy (Department of the Navy)	$22,817,602	0.2%	Rank history: not on the FY2021–FY2024 lists; up 61 since FY2024.
57	Aleut Environmental Remediation, LLC Top agencies Army (Department of the Army)	$22,753,654	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	Bristol Bay Native Corporation 2 awardees, including Bristol Environmental Solutions LLC and Aerostar SES LLC Top agencies Army (Department of the Army)	$21,262,708	0.2%	Rank history: not on the FY2021–FY2022 lists, #75 in FY2023 and not on the FY2024 list; up 89 since FY2024.
63	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 11 since FY2024.
64	Jacobs Government Services Company 6 awardees, including Jacobs Engineering Group Inc., Jacobs Usae Joint Venture 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 32 since FY2024.
65	Cape Environmental Management Inc. Top agencies EPA (Environmental Protection Agency) Army (Department of the Army) USAF (Department of the Air Force)	$18,750,555	0.2%	Rank history: #19 in FY2021, #15 in FY2022, #77 in FY2023 and #77 in FY2024; up 12 since FY2024.
66	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 80 since FY2024.
67	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 44 since FY2024.
68	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 171 since FY2024.
69	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 13 since FY2024.
70	ECC Environmental LLC Top agencies EPA (Environmental Protection Agency) Army (Department of the Army)	$16,713,114	0.2%	Rank history: not on the FY2021–FY2023 lists and #64 in FY2024; down 6 since FY2024.
71	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 37 since FY2024.
72	Olgoonik Corporation Through FPM Remediations, Inc. Top agencies USAF (Department of the Air Force) Army (Department of the Army)	$16,124,669	0.2%	Rank history: #66 in FY2021, not on the FY2022–FY2023 lists and #67 in FY2024; down 5 since FY2024.
73	Enviro-Fix Solutions LLC Top agencies Army (Department of the Army)	$15,580,291	0.2%	Rank history: not on the FY2021–FY2022 lists, #100 in FY2023 and #84 in FY2024; up 11 since FY2024.
74	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 1 since FY2024.
75	Ducks Unlimited, Inc. Top agencies Army (Department of the Army)	$15,000,000	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
76	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 3 since FY2024.
77	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 55 since FY2024.
78	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.
79	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 21 since FY2024.
80	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 39 since FY2024.
81	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 48 since FY2024.
82	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 27 since FY2024.
83	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 152 since FY2024.
84	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 4 since FY2024.
85	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 83 since FY2024.
86	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 64 since FY2024.
87	Air Resources Helicopters, Inc. Top agencies USDA (Department of Agriculture)	$12,790,076	0.1%	Rank history: not on the FY2021–FY2024 lists; up 35 since FY2024.
88	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 17 since FY2024.
89	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.
90	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 95 since FY2024.
91	Dynamic Aviation Group, Inc. Top agencies USDA (Department of Agriculture)	$12,385,552	0.1%	Rank history: not on the FY2021–FY2024 lists; up 82 since FY2024.
92	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 51 since FY2024.
93	Bluesky Helicopters Inc. Top agencies USDA (Department of Agriculture)	$12,055,118	0.1%	Rank history: not on the FY2021–FY2024 lists; up 27 since FY2024.
94	C.c. Calzone, LLC Top agencies USDA (Department of Agriculture)	$11,889,490	0.1%	Rank history: not on the FY2021–FY2024 lists; up 67 since FY2024.
95	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 6 since FY2024.
96	Hillsboro Aviation Inc. Top agencies USDA (Department of Agriculture)	$11,836,805	0.1%	Rank history: not on the FY2021–FY2024 lists; up 16 since FY2024.
97	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 4 since FY2024.
98	Seaon Environmental LLC Top agencies Navy (Department of the Navy)	$11,551,197	0.1%	Rank history: not on the FY2021–FY2024 lists; up 25 since FY2024.
99	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 14 since FY2024.
100	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 30 since FY2024.

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100 of 4,752 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	ECC Constructors LLC
F1 Environmental Systems Protection	$2,601,911,667	Bechtel Parsons Blue Grass, A Joint Venture
F0 Natural Resource Conservation Services	$2,562,936,726	Helicopter Transport Services, 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. 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. ECC Constructors LLC ($1.85B), 2. Amentum Holdings, Inc. ($1.06B), 3. Bechtel Parsons Blue Grass, A Joint Venture ($289M), 4. Bechtel Corp ($238M), 5. Sevenson Environmental Services, Inc. ($204M), 6. Arctic Slope Regional Corporation ($144M), 7. Guidehouse Inc. ($140M), 8. Hydrogeologic, Inc. ($134M), 9. United Cleanup Oak Ridge LLC ($132M), 10. Environmental Restoration LLC ($116M).

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