Top 100 Contractors in PSC F: Natural Resources Management, Jul 2025–Jun 2026

Name: Top 100 Contractors in PSC F: Natural Resources Management, Jul 2025–Jun 2026
Creator: GovTribe

Parent companies by net contract obligations Jul 1, 2025 – Jun 30, 2026 Code page on GovTribe

The top 10 won 31% of PSC F contract dollars from July 2025 through June 2026

Contract obligations: $7,444,859,278 Net of deobligations, by contracts coded PSC F or a code under it
Contractors: 4,455 Parent companies with an obligation
Largest contractor: Amentum Holdings, Inc. $1.56 billion, 18.7% of obligations
Data as of: Oct 16, 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	Amentum Holdings, Inc. 8 awardees, including United Cleanup Oak Ridge LLC, Idaho Environmental Coalition LLC and Southern Ohio Cleanup Company LLC Top agencies DOE (Department of Energy) Army (Department of the Army) DOT (Department of Transportation)	$1,557,490,870	18.7%	Rank history: not on the FY2021–FY2024 lists and #2 in FY2025; up 1 since Jul 2024–Jun 2025.
2	Hydrogeologic, Inc. Top agencies Army (Department of the Army) EPA (Environmental Protection Agency) Navy (Department of the Navy)	$137,919,431	1.7%	Rank history: #4 in FY2021, #5 in FY2022, #5 in FY2023, #8 in FY2024 and #8 in FY2025; up 7 since Jul 2024–Jun 2025.
3	L3Harris Technologies, Inc. Through Bwxt Ordnance Tennessee, Inc. Top agencies DOE (Department of Energy)	$130,800,000	1.6%	Rank history: not on the FY2021–FY2024 lists and #22 in FY2025; new, not ranked in Jul 2024–Jun 2025.
4	Environmental Restoration LLC Top agencies EPA (Environmental Protection Agency) DOJ (Department of Justice) Army (Department of the Army)	$127,259,158	1.5%	Rank history: #8 in FY2021, #4 in FY2022, #8 in FY2023, #20 in FY2024 and #10 in FY2025; up 17 since Jul 2024–Jun 2025.
5	Helicopter Transport Services, LLC Top agencies USDA (Department of Agriculture)	$114,553,319	1.4%	Rank history: not on the FY2021 list, #11 in FY2022, #49 in FY2023, #56 in FY2024 and #11 in FY2025; up 8 since Jul 2024–Jun 2025.
6	Bechtel Parsons Blue Grass, A Joint Venture Top agencies Army (Department of the Army)	$109,599,732	1.3%	Rank history: not on the FY2021–FY2023 lists, #5 in FY2024 and #3 in FY2025; down 1 since Jul 2024–Jun 2025.
7	Hanford Laboratory Management and Integration LLC Top agencies DOE (Department of Energy)	$106,922,566	1.3%	Rank history: #20 in FY2021, #8 in FY2022, #10 in FY2023, #9 in FY2024 and #13 in FY2025; up 4 since Jul 2024–Jun 2025.
8	West Valley Cleanup Alliance, LLC Top agencies DOE (Department of Energy)	$104,567,286	1.3%	Rank history: not on the FY2021–FY2024 lists and #27 in FY2025; up 220 since Jul 2024–Jun 2025.
9	Guidehouse Inc. 2 awardees, including Aptim Federal Services, LLC Top agencies DOE (Department of Energy) Army (Department of the Army) Navy (Department of the Navy)	$94,921,441	1.1%	Rank history: not on the FY2021–FY2023 lists, #13 in FY2024 and #7 in FY2025; up 7 since Jul 2024–Jun 2025.
10	Helicopter Express LLC Top agencies USDA (Department of Agriculture)	$94,665,527	1.1%	Rank history: not on the FY2021 list, #33 in FY2022, #38 in FY2023, #18 in FY2024 and #15 in FY2025; up 7 since Jul 2024–Jun 2025.
11	EA Engineering Science and Technology Inc. PBC Top agencies EPA (Environmental Protection Agency) Army (Department of the Army) USAF (Department of the Air Force)	$93,324,029	1.1%	Rank history: not on the FY2021–FY2023 lists, #7 in FY2024 and #12 in FY2025; down 4 since Jul 2024–Jun 2025.
12	North Wind Portage, Inc. Top agencies DOE (Department of Energy) Army (Department of the Army)	$92,259,460	1.1%	Rank history: not on the FY2021 list, #24 in FY2022, not on the FY2023 list, #16 in FY2024 and #16 in FY2025; up 2 since Jul 2024–Jun 2025.
13	Tetra Tech, Inc. 13 awardees, including Tetra TECH EC, Inc. Top agencies Army (Department of the Army) EPA (Environmental Protection Agency) DOE (Department of Energy)	$91,833,894	1.1%	Rank history: #16 in FY2021, #13 in FY2022, #17 in FY2023, #17 in FY2024 and #14 in FY2025; up 2 since Jul 2024–Jun 2025.
14	Kemron Environmental Services Inc. 3 awardees, including Kemron / Arrowhead JV, LLC Top agencies EPA (Environmental Protection Agency) Army (Department of the Army)	$80,583,415	1.0%	Rank history: not on the FY2021–FY2023 lists, #14 in FY2024 and #45 in FY2025; up 5 since Jul 2024–Jun 2025.
15	Sevenson Environmental Services, Inc. Top agencies Army (Department of the Army) EPA (Environmental Protection Agency)	$72,637,866	0.9%	Rank history: #17 in FY2021, #6 in FY2022, #14 in FY2023, #3 in FY2024 and #5 in FY2025; down 12 since Jul 2024–Jun 2025.
16	Bechtel Corp Through Bechtel National, Inc. Top agencies Army (Department of the Army)	$68,453,847	0.8%	Rank history: #2 in FY2021, #1 in FY2022, #1 in FY2023, #2 in FY2024 and #4 in FY2025; down 10 since Jul 2024–Jun 2025.
17	BWX Technologies, Inc. 2 awardees, including Nuclear Fuel Services Inc. and Bwxt Nuclear Operations Group, Inc. Top agencies DOE (Department of Energy)	$66,865,171	0.8%	Rank history: not on the FY2021 list, #35 in FY2022, #7 in FY2023, #19 in FY2024 and #18 in FY2025; up 6 since Jul 2024–Jun 2025.
18	Brice Civil Constructors, Inc. Top agencies Army (Department of the Army)	$64,689,360	0.8%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
19	Navarro Research and Engineering, Inc. Top agencies DOE (Department of Energy) Army (Department of the Army)	$62,165,830	0.7%	Rank history: #18 in FY2021, #21 in FY2022, #24 in FY2023, #27 in FY2024 and #21 in FY2025; up 6 since Jul 2024–Jun 2025.
20	Aero-Flite, Inc. Top agencies USDA (Department of Agriculture)	$58,015,061	0.7%	Rank history: #99 in FY2021, not on the FY2022–FY2023 lists, #39 in FY2024 and #43 in FY2025; up 26 since Jul 2024–Jun 2025.
21	Neptune Aviation Services, Inc. Top agencies USDA (Department of Agriculture) DOI (Department of the Interior)	$55,935,462	0.7%	Rank history: #73 in FY2021, #54 in FY2022, #69 in FY2023, #35 in FY2024 and #33 in FY2025; up 21 since Jul 2024–Jun 2025.
22	Tehama Technical Services, LLC Top agencies EPA (Environmental Protection Agency) Army (Department of the Army) DOI (Department of the Interior)	$52,884,519	0.6%	Rank history: not on the FY2021–FY2025 lists; up 175 since Jul 2024–Jun 2025.
23	Aero Air, LLC Top agencies USDA (Department of Agriculture)	$52,484,651	0.6%	Rank history: not on the FY2021–FY2022 lists, #91 in FY2023, #32 in FY2024 and #30 in FY2025; up 7 since Jul 2024–Jun 2025.
24	Oneida Environmental, LLC Top agencies Army (Department of the Army) DOI (Department of the Interior) USAF (Department of the Air Force)	$51,062,053	0.6%	Rank history: not on the FY2021–FY2024 lists and #23 in FY2025; up 101 since Jul 2024–Jun 2025.
25	Enviro-Fix Solutions LLC Top agencies Army (Department of the Army)	$49,701,228	0.6%	Rank history: not on the FY2021–FY2022 lists, #100 in FY2023, #84 in FY2024 and #73 in FY2025; up 415 since Jul 2024–Jun 2025.
26	Inmar RX Solutions Inc. Top agencies HHS (Department of Health and Human Services)	$40,724,002	0.5%	Rank history: not on the FY2021–FY2024 lists and #25 in FY2025; new, not ranked in Jul 2024–Jun 2025.
27	Siller Helicopters, LLC Top agencies USDA (Department of Agriculture)	$40,679,626	0.5%	Rank history: not on the FY2021 list, #41 in FY2022, #46 in FY2023, #57 in FY2024 and #24 in FY2025; up 6 since Jul 2024–Jun 2025.
28	Coulson Aviation (Usa), Inc. Top agencies USDA (Department of Agriculture)	$40,220,933	0.5%	Rank history: not on the FY2021 list, #69 in FY2022, #78 in FY2023, #31 in FY2024 and #31 in FY2025; up 8 since Jul 2024–Jun 2025.
29	Tenax Aerospace LLC Top agencies USDA (Department of Agriculture)	$35,237,462	0.4%	Rank history: not on the FY2021–FY2024 lists and #41 in FY2025; up 20 since Jul 2024–Jun 2025.
30	Weston Solutions Holdings Inc Through Weston Solutions Inc. Top agencies Army (Department of the Army) EPA (Environmental Protection Agency)	$35,018,086	0.4%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
31	Billings Flying Service LLC Top agencies USDA (Department of Agriculture)	$34,668,374	0.4%	Rank history: not on the FY2021 list, #19 in FY2022, #39 in FY2023, #45 in FY2024 and #32 in FY2025; down 4 since Jul 2024–Jun 2025.
32	AECOM Technical Services, Inc. Top agencies EPA (Environmental Protection Agency) Army (Department of the Army) Commerce (Department of Commerce)	$34,609,682	0.4%	Rank history: #89 in FY2021, not on the FY2022–FY2023 lists, #10 in FY2024 and #19 in FY2025; down 20 since Jul 2024–Jun 2025.
33	Eastern Shawnee - Bay West JV, LLC Top agencies Army (Department of the Army)	$34,283,868	0.4%	Rank history: not on the FY2021–FY2024 lists and #78 in FY2025; new, not ranked in Jul 2024–Jun 2025.
34	Leidos Holdings, Inc. 4 awardees, including Leidos, Inc. Top agencies DHS (Department of Homeland Security) Army (Department of the Army) USAF (Department of the Air Force)	$33,284,181	0.4%	Rank history: #29 in FY2021, #34 in FY2022, #31 in FY2023, #44 in FY2024 and #39 in FY2025; up 17 since Jul 2024–Jun 2025.
35	Rotak LLC Top agencies USDA (Department of Agriculture)	$33,146,457	0.4%	Rank history: not on the FY2021–FY2022 lists, #71 in FY2023, #52 in FY2024 and #26 in FY2025; down 9 since Jul 2024–Jun 2025.
36	10 Tanker Air Carrier LLC Top agencies USDA (Department of Agriculture)	$31,916,928	0.4%	Rank history: not on the FY2021–FY2023 lists, #29 in FY2024 and #20 in FY2025; down 12 since Jul 2024–Jun 2025.
37	Promethean Operating I LLC Top agencies DOI (Department of the Interior)	$30,121,961	0.4%	Rank history: not on the FY2021–FY2023 lists, #79 in FY2024 and #76 in FY2025; new, not ranked in Jul 2024–Jun 2025.
38	Grayback Forestry Inc. Top agencies USDA (Department of Agriculture) DOI (Department of the Interior)	$27,993,269	0.3%	Rank history: not on the FY2021–FY2023 lists, #72 in FY2024 and #48 in FY2025; up 10 since Jul 2024–Jun 2025.
39	Capitol Helicopters, Inc. Top agencies USDA (Department of Agriculture)	$27,528,217	0.3%	Rank history: not on the FY2021–FY2023 lists, #86 in FY2024 and #46 in FY2025; up 14 since Jul 2024–Jun 2025.
40	Brice Engineering, LLC Top agencies Army (Department of the Army) DHS (Department of Homeland Security) USAF (Department of the Air Force)	$26,850,228	0.3%	Rank history: #43 in FY2021, #25 in FY2022, #12 in FY2023, #47 in FY2024 and #40 in FY2025; down 5 since Jul 2024–Jun 2025.
41	Environmental Chemical Corporation Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$26,418,961	0.3%	Rank history: #22 in FY2021, #51 in FY2022, #26 in FY2023, #26 in FY2024 and #37 in FY2025; down 2 since Jul 2024–Jun 2025.
42	Dynamic Aviation Group, Inc. Top agencies USDA (Department of Agriculture)	$26,097,493	0.3%	Rank history: not on the FY2021–FY2024 lists and #91 in FY2025; up 46 since Jul 2024–Jun 2025.
43	Couvillion Group LLC Top agencies DHS (Department of Homeland Security)	$25,991,966	0.3%	Rank history: #61 in FY2021, #45 in FY2022, #45 in FY2023, #66 in FY2024 and #49 in FY2025; up 1 since Jul 2024–Jun 2025.
44	Vernadero Group Inc. Top agencies DHS (Department of Homeland Security) Navy (Department of the Navy) Army (Department of the Army)	$25,813,559	0.3%	Rank history: not on the FY2021–FY2025 lists; up 188 since Jul 2024–Jun 2025.
45	CDM Federal Programs Corporation Top agencies EPA (Environmental Protection Agency) Army (Department of the Army)	$25,508,271	0.3%	Rank history: not on the FY2021–FY2023 lists, #36 in FY2024 and #38 in FY2025; down 17 since Jul 2024–Jun 2025.
46	Gsia-Parsons JV LLC Top agencies Army (Department of the Army)	$25,463,633	0.3%	Rank history: not on the FY2021–FY2024 lists and #60 in FY2025; new, not ranked in Jul 2024–Jun 2025.
47	Republic Services Inc. 7 awardees, including Environmental, Safety & Health Consulting Services, Inc., US Ecology Washington Inc. and US Ecology Alaska LLC Top agencies DHS (Department of Homeland Security) Army (Department of the Army) Navy (Department of the Navy)	$25,403,473	0.3%	Rank history: not on the FY2021–FY2024 lists and #36 in FY2025; down 10 since Jul 2024–Jun 2025.
48	Patrick Environmental Inc. Top agencies USDA (Department of Agriculture)	$24,829,485	0.3%	Rank history: not on the FY2021 list, #92 in FY2022, #80 in FY2023, #69 in FY2024 and #51 in FY2025; up 9 since Jul 2024–Jun 2025.
49	Bighorn Airways Inc. Top agencies USDA (Department of Agriculture) DOI (Department of the Interior)	$24,558,874	0.3%	Rank history: not on the FY2021–FY2024 lists and #66 in FY2025; up 18 since Jul 2024–Jun 2025.
50	Eastern Research Group Inc. Top agencies EPA (Environmental Protection Agency) GSA (General Services Administration) USDA (Department of Agriculture)	$24,556,136	0.3%	Rank history: #49 in FY2021, #42 in FY2022, #28 in FY2023, #23 in FY2024 and #34 in FY2025; down 21 since Jul 2024–Jun 2025.
51	Paragon Professional Services LLC Top agencies EPA (Environmental Protection Agency) DOE (Department of Energy) Army (Department of the Army)	$24,410,499	0.3%	Rank history: #76 in FY2021, #90 in FY2022, #32 in FY2023, #38 in FY2024 and #29 in FY2025; down 20 since Jul 2024–Jun 2025.
52	Hgl-Aptim JV LLC Top agencies Army (Department of the Army)	$24,408,670	0.3%	Rank history: #52 in FY2021, #31 in FY2022, #58 in FY2023, #33 in FY2024 and #50 in FY2025; up 4 since Jul 2024–Jun 2025.
53	Cape Environmental Management Inc. Top agencies EPA (Environmental Protection Agency) Army (Department of the Army) USAF (Department of the Air Force)	$24,059,480	0.3%	Rank history: #19 in FY2021, #15 in FY2022, #77 in FY2023, #77 in FY2024 and #65 in FY2025; up 11 since Jul 2024–Jun 2025.
54	Bristol Bay Native Corporation 2 awardees, including Bristol Environmental Solutions LLC and Aerostar SES LLC Top agencies Army (Department of the Army)	$23,515,956	0.3%	Rank history: not on the FY2021–FY2022 lists, #75 in FY2023, not on the FY2024 list and #62 in FY2025; up 173 since Jul 2024–Jun 2025.
55	Kfs, LLC Top agencies Army (Department of the Army)	$23,400,000	0.3%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
56	Aleut Environmental Remediation, LLC Top agencies Army (Department of the Army)	$22,408,328	0.3%	Rank history: not on the FY2021–FY2024 lists and #57 in FY2025; new, not ranked in Jul 2024–Jun 2025.
57	Sustainment & Restoration Services, LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force) Navy (Department of the Navy)	$22,036,795	0.3%	Rank history: not on the FY2021–FY2023 lists, #68 in FY2024 and #44 in FY2025; down 2 since Jul 2024–Jun 2025.
58	Croman Corp Top agencies USDA (Department of Agriculture)	$20,080,422	0.2%	Rank history: not on the FY2021–FY2023 lists, #42 in FY2024 and #42 in FY2025; down 26 since Jul 2024–Jun 2025.
59	Heli-1 Corp Top agencies USDA (Department of Agriculture)	$19,833,861	0.2%	Rank history: not on the FY2021–FY2023 lists, #100 in FY2024 and #79 in FY2025; up 19 since Jul 2024–Jun 2025.
60	Parsons Corporation Through Parsons Government Services Inc. Top agencies Army (Department of the Army) MDA (DOD Missile Defense Agency)	$19,161,644	0.2%	Rank history: #64 in FY2021, #20 in FY2022, #53 in FY2023, #73 in FY2024 and #47 in FY2025; up 1 since Jul 2024–Jun 2025.
61	Bay West LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force) DOJ (Department of Justice)	$18,936,808	0.2%	Rank history: #96 in FY2021, not on the FY2022 list, #56 in FY2023, #65 in FY2024 and #53 in FY2025; up 5 since Jul 2024–Jun 2025.
62	Gulf South Research Corp Top agencies DHS (Department of Homeland Security) Navy (Department of the Navy) OSD (Office of the Secretary of Defense)	$18,804,824	0.2%	Rank history: not on the FY2021–FY2025 lists; up 336 since Jul 2024–Jun 2025.
63	Environmental Rail Solutions Inc. Top agencies Army (Department of the Army)	$18,382,861	0.2%	Rank history: not on the FY2021–FY2022 lists, #79 in FY2023, #70 in FY2024 and not on the FY2025 list; up 118 since Jul 2024–Jun 2025.
64	Firestorm Wildland Fire Suppression, Inc. Top agencies USDA (Department of Agriculture)	$17,165,933	0.2%	Rank history: not on the FY2021 list, #68 in FY2022, #85 in FY2023, #74 in FY2024 and #63 in FY2025; up 1 since Jul 2024–Jun 2025.
65	Houston's Too LC Top agencies USDA (Department of Agriculture)	$16,894,718	0.2%	Rank history: #40 in FY2021, not on the FY2022–FY2024 lists and #86 in FY2025; up 79 since Jul 2024–Jun 2025.
66	State of Oregon Department of Fish and Wildlife Top agencies Army (Department of the Army)	$16,582,529	0.2%	Rank history: not on the FY2021–FY2025 lists; up 26 since Jul 2024–Jun 2025.
67	Brink Brothers Inc. Top agencies USDA (Department of Agriculture)	$16,573,121	0.2%	Rank history: not on the FY2021–FY2022 lists, #95 in FY2023, #34 in FY2024 and #71 in FY2025; down 29 since Jul 2024–Jun 2025.
68	Precision, LLC Top agencies USDA (Department of Agriculture)	$16,299,027	0.2%	Rank history: not on the FY2021–FY2023 lists, #51 in FY2024 and #35 in FY2025; down 21 since Jul 2024–Jun 2025.
69	Henrys Aerial Service Inc. Top agencies DOI (Department of the Interior)	$15,654,255	0.2%	Rank history: not on the FY2021–FY2024 lists and #90 in FY2025; up 61 since Jul 2024–Jun 2025.
70	Jacobs Engineering Group Inc. 5 awardees, including Jacobs Usae Joint Venture, Jacobs Government Services Company and Ch2M Hill Constructors, Inc. Top agencies EPA (Environmental Protection Agency) Army (Department of the Army) DOI (Department of the Interior)	$15,118,143	0.2%	Rank history: not on the FY2021–FY2023 lists, #96 in FY2024 and #64 in FY2025; up 48 since Jul 2024–Jun 2025.
71	Miller Timber Services, Inc. Top agencies USDA (Department of Agriculture) DOI (Department of the Interior)	$15,059,938	0.2%	Rank history: not on the FY2021 list, #82 in FY2022, not on the FY2023–FY2024 lists and #77 in FY2025; up 10 since Jul 2024–Jun 2025.
72	Hgl-Aptim Technologies JV LLC Top agencies Army (Department of the Army) DLA (Defense Logistics Agency) DOE (Department of Energy)	$15,028,852	0.2%	Rank history: not on the FY2021–FY2024 lists and #28 in FY2025; down 20 since Jul 2024–Jun 2025.
73	Ducks Unlimited, Inc. Top agencies Army (Department of the Army)	$15,000,000	0.2%	Rank history: not on the FY2021–FY2024 lists and #75 in FY2025; new, not ranked in Jul 2024–Jun 2025.
74	Trans Aero LLC Top agencies USDA (Department of Agriculture)	$14,868,301	0.2%	Rank history: not on the FY2021–FY2025 lists; up 16 since Jul 2024–Jun 2025.
75	Western Pilot Service Inc. Top agencies DOI (Department of the Interior) USDA (Department of Agriculture)	$14,570,639	0.2%	Rank history: not on the FY2021–FY2023 lists, #82 in FY2024 and #69 in FY2025; down 6 since Jul 2024–Jun 2025.
76	Helimax Aviation LLC Top agencies USDA (Department of Agriculture)	$14,556,089	0.2%	Rank history: not on the FY2021–FY2023 lists, #62 in FY2024 and #54 in FY2025; down 33 since Jul 2024–Jun 2025.
77	Aptim Hdr, LLC Top agencies EPA (Environmental Protection Agency)	$14,310,240	0.2%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
78	Orbic Air, LLC Top agencies USDA (Department of Agriculture)	$14,109,023	0.2%	Rank history: not on the FY2021–FY2025 lists; up 39 since Jul 2024–Jun 2025.
79	Tierra Right of Way Services Ltd Top agencies DHS (Department of Homeland Security)	$14,036,927	0.2%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
80	C M C, Inc. Top agencies EPA (Environmental Protection Agency)	$14,024,236	0.2%	Rank history: #70 in FY2021, #29 in FY2022, #25 in FY2023, #41 in FY2024 and not on the FY2025 list; down 12 since Jul 2024–Jun 2025.
81	The Solution Foundry, LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$13,774,070	0.2%	Rank history: #90 in FY2021, #94 in FY2022, not on the FY2023–FY2024 lists and #88 in FY2025; up 27 since Jul 2024–Jun 2025.
82	Big Sky Mobile Catering Corp Top agencies USDA (Department of Agriculture)	$13,627,738	0.2%	Rank history: #46 in FY2021, not on the FY2022–FY2024 lists and #80 in FY2025; up 1 since Jul 2024–Jun 2025.
83	Kit Helicopter Operations LLC Top agencies USDA (Department of Agriculture)	$13,532,465	0.2%	Rank history: not on the FY2021–FY2025 lists; up 33 since Jul 2024–Jun 2025.
84	Arrowhead Contracting, LLC Top agencies EPA (Environmental Protection Agency)	$13,197,977	0.2%	Rank history: not on the FY2021–FY2022 lists, #44 in FY2023, not on the FY2024 list and #68 in FY2025; up 56 since Jul 2024–Jun 2025.
85	Spur Aviation Services, LC Top agencies USDA (Department of Agriculture) DOI (Department of the Interior)	$13,195,898	0.2%	Rank history: not on the FY2021–FY2023 lists, #80 in FY2024 and #84 in FY2025; down 3 since Jul 2024–Jun 2025.
86	Clean Harbors Inc. Through Clean Harbors Environmental Services Inc. Top agencies DHS (Department of Homeland Security) Navy (Department of the Navy) USDA (Department of Agriculture)	$13,155,568	0.2%	Rank history: not on the FY2021–FY2024 lists and #83 in FY2025; down 6 since Jul 2024–Jun 2025.
87	CPM Development Corporation Top agencies USDA (Department of Agriculture)	$13,092,206	0.2%	Rank history: not on the FY2021–FY2024 lists and #55 in FY2025; up 32 since Jul 2024–Jun 2025.
88	Thunder MTN Catering Inc. Top agencies USDA (Department of Agriculture)	$13,078,869	0.2%	Rank history: #77 in FY2021, #71 in FY2022, not on the FY2023–FY2024 lists and #81 in FY2025; down 3 since Jul 2024–Jun 2025.
89	Fletcher Flying Service Inc Top agencies DOI (Department of the Interior)	$12,834,249	0.2%	Rank history: not on the FY2021–FY2025 lists; up 44 since Jul 2024–Jun 2025.
90	Co Fire Aviation, Inc. Top agencies DOI (Department of the Interior)	$12,796,222	0.2%	Rank history: not on the FY2021–FY2024 lists and #67 in FY2025; down 13 since Jul 2024–Jun 2025.
91	Pacific OASIS Inc Top agencies USDA (Department of Agriculture)	$12,650,228	0.2%	Rank history: not on the FY2021–FY2023 lists, #75 in FY2024 and #74 in FY2025; down 21 since Jul 2024–Jun 2025.
92	Aero Spray Inc. Top agencies DOI (Department of the Interior)	$12,546,426	0.2%	Rank history: #54 in FY2021 and not on the FY2022–FY2025 lists; down 5 since Jul 2024–Jun 2025.
93	Right Way Environmental Contractors, Inc. Top agencies Army (Department of the Army)	$12,510,751	0.2%	Rank history: not on the FY2021–FY2024 lists and #89 in FY2025; new, not ranked in Jul 2024–Jun 2025.
94	Gryphon Environmental, LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$12,477,221	0.1%	Rank history: not on the FY2021–FY2025 lists; up 302 since Jul 2024–Jun 2025.
95	Catawba Teapec LLC Top agencies DOE (Department of Energy)	$12,434,977	0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
96	Bluesky Helicopters Inc. Top agencies USDA (Department of Agriculture)	$12,104,943	0.1%	Rank history: not on the FY2021–FY2024 lists and #93 in FY2025; up 2 since Jul 2024–Jun 2025.
97	J.f. Brennan Company, Inc. Top agencies EPA (Environmental Protection Agency) Army (Department of the Army)	$11,975,029	0.1%	Rank history: not on the FY2021 list, #7 in FY2022, not on the FY2023 list, #48 in FY2024 and not on the FY2025 list; up 280 since Jul 2024–Jun 2025.
98	Global Science & Technology, LLC Top agencies Commerce (Department of Commerce)	$11,964,125	0.1%	Rank history: not on the FY2021–FY2025 lists; up 218 since Jul 2024–Jun 2025.
99	Sundance Consultants, LLC 3 awardees, including Sundance EA Associates II Top agencies DHS (Department of Homeland Security) Navy (Department of the Navy) DOI (Department of the Interior)	$11,922,046	0.1%	Rank history: not on the FY2021–FY2025 lists; up 52 since Jul 2024–Jun 2025.
100	P.j. Helicopters, Inc. Top agencies USDA (Department of Agriculture)	$11,796,660	0.1%	Rank history: not on the FY2021–FY2023 lists, #76 in FY2024 and not on the FY2025 list; down 29 since Jul 2024–Jun 2025.

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100 of 4,455 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	$2,814,022,609	Amentum Holdings, Inc.
F0 Natural Resource Conservation Services	$2,552,112,878	Helicopter Transport Services, LLC
F1 Environmental Systems Protection	$2,078,723,790	Bechtel Parsons Blue Grass, A Joint Venture

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 $8.34 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.
Period: the trailing 12 months end with the last month that ended at least 90 days ago, because the Department of Defense reports its contract actions to FPDS about 90 days late. The list is rebuilt each night.
Rank changes compare with Jul 2024–Jun 2025. "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.
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 Jul 2025–Jun 2026?

1. Amentum Holdings, Inc. ($1.56B), 2. Hydrogeologic, Inc. ($138M), 3. L3Harris Technologies, Inc. ($131M), 4. Environmental Restoration LLC ($127M), 5. Helicopter Transport Services, LLC ($115M), 6. Bechtel Parsons Blue Grass, A Joint Venture ($110M), 7. Hanford Laboratory Management and Integration LLC ($107M), 8. West Valley Cleanup Alliance, LLC ($105M), 9. Guidehouse Inc. ($94.9M), 10. Helicopter Express LLC ($94.7M).

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