Top 100 Contractors in PSC F9: Natural Resources – Other Services, Jul 2025–Jun 2026

Name: Top 100 Contractors in PSC F9: Natural Resources – Other Services, 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 68% of PSC F9 contract dollars from July 2025 through June 2026

Contract obligations: $2,814,022,609 Net of deobligations, by contracts coded PSC F9 or a code under it
Contractors: 587 Parent companies with an obligation
Largest contractor: Amentum Holdings, Inc. $1.49 billion, 46.6% 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. 5 awardees, including United Cleanup Oak Ridge LLC, Idaho Environmental Coalition LLC and Southern Ohio Cleanup Company LLC Top agencies DOE (Department of Energy)	$1,486,494,902	46.6%	Rank history: not on the FY2021–FY2024 lists and #2 in FY2025; up 1 since Jul 2024–Jun 2025.
2	L3Harris Technologies, Inc. Through Bwxt Ordnance Tennessee, Inc. Top agencies DOE (Department of Energy)	$130,800,000	4.1%	Rank history: not on the FY2021–FY2024 lists and #9 in FY2025; new, not ranked in Jul 2024–Jun 2025.
3	Hanford Laboratory Management and Integration LLC Top agencies DOE (Department of Energy)	$106,922,566	3.4%	Rank history: #9 in FY2021, #4 in FY2022, #6 in FY2023, #5 in FY2024 and #5 in FY2025; up 2 since Jul 2024–Jun 2025.
4	West Valley Cleanup Alliance, LLC Top agencies DOE (Department of Energy)	$104,567,286	3.3%	Rank history: not on the FY2021–FY2024 lists and #11 in FY2025; up 65 since Jul 2024–Jun 2025.
5	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)	$75,133,181	2.4%	Rank history: not on the FY2021–FY2023 lists, #7 in FY2024 and #4 in FY2025; up 1 since Jul 2024–Jun 2025.
6	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	2.1%	Rank history: not on the FY2021 list, #15 in FY2022, #3 in FY2023, #8 in FY2024 and #7 in FY2025; up 3 since Jul 2024–Jun 2025.
7	Hydrogeologic, Inc. Top agencies Army (Department of the Army) EPA (Environmental Protection Agency)	$56,898,543	1.8%	Rank history: #4 in FY2021, #8 in FY2022, #7 in FY2023, #10 in FY2024 and #8 in FY2025; unchanged since Jul 2024–Jun 2025.
8	Navarro Research and Engineering, Inc. Top agencies DOE (Department of Energy)	$54,029,345	1.7%	Rank history: #12 in FY2021, #13 in FY2022, #11 in FY2023, #14 in FY2024 and #12 in FY2025; up 2 since Jul 2024–Jun 2025.
9	Sevenson Environmental Services, Inc. Top agencies Army (Department of the Army) EPA (Environmental Protection Agency)	$41,068,801	1.3%	Rank history: #8 in FY2021, #2 in FY2022, #9 in FY2023, #4 in FY2024 and #10 in FY2025; up 3 since Jul 2024–Jun 2025.
10	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)	$31,893,356	1.0%	Rank history: #27 in FY2021, #18 in FY2022, #24 in FY2023, #20 in FY2024 and #14 in FY2025; up 9 since Jul 2024–Jun 2025.
11	EA Engineering Science and Technology Inc. PBC Top agencies Army (Department of the Army) EPA (Environmental Protection Agency) Navy (Department of the Navy)	$27,378,756	0.9%	Rank history: #10 in FY2021, #11 in FY2022, #2 in FY2023, #15 in FY2024 and #13 in FY2025; unchanged since Jul 2024–Jun 2025.
12	Environmental Restoration LLC Top agencies EPA (Environmental Protection Agency)	$19,354,444	0.6%	Rank history: #23 in FY2021, #6 in FY2022, #12 in FY2023, #32 in FY2024 and #24 in FY2025; up 27 since Jul 2024–Jun 2025.
13	Sustainment & Restoration Services, LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$18,545,183	0.6%	Rank history: not on the FY2021–FY2023 lists, #79 in FY2024 and #15 in FY2025; up 16 since Jul 2024–Jun 2025.
14	Environmental Rail Solutions Inc. Top agencies Army (Department of the Army)	$18,382,861	0.6%	Rank history: not on the FY2021 list, #47 in FY2022, #31 in FY2023, #23 in FY2024 and #32 in FY2025; up 39 since Jul 2024–Jun 2025.
15	Eastern Research Group Inc. Top agencies EPA (Environmental Protection Agency) GSA (General Services Administration) USDA (Department of Agriculture)	$18,293,185	0.6%	Rank history: #49 in FY2021, #42 in FY2022, #25 in FY2023, #17 in FY2024 and #27 in FY2025; up 35 since Jul 2024–Jun 2025.
16	Ducks Unlimited, Inc. Top agencies Army (Department of the Army)	$15,000,000	0.5%	Rank history: not on the FY2021–FY2024 lists and #22 in FY2025; new, not ranked in Jul 2024–Jun 2025.
17	Bay West LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$13,568,932	0.4%	Rank history: #47 in FY2021, #53 in FY2022, #21 in FY2023, #22 in FY2024 and #19 in FY2025; up 5 since Jul 2024–Jun 2025.
18	Gulf South Research Corp Top agencies DHS (Department of Homeland Security) Navy (Department of the Navy) OSD (Office of the Secretary of Defense)	$12,865,318	0.4%	Rank history: not on the FY2021–FY2024 lists and #88 in FY2025; up 99 since Jul 2024–Jun 2025.
19	The Solution Foundry, LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$12,816,399	0.4%	Rank history: #40 in FY2021, #36 in FY2022, #40 in FY2023, #36 in FY2024 and #28 in FY2025; up 11 since Jul 2024–Jun 2025.
20	Environmental Chemical Corporation Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$12,606,540	0.4%	Rank history: #13 in FY2021, #19 in FY2022, #14 in FY2023, #16 in FY2024 and #20 in FY2025; up 3 since Jul 2024–Jun 2025.
21	Right Way Environmental Contractors, Inc. Top agencies Army (Department of the Army)	$12,510,751	0.4%	Rank history: not on the FY2021–FY2024 lists and #26 in FY2025; new, not ranked in Jul 2024–Jun 2025.
22	Catawba Teapec LLC Top agencies DOE (Department of Energy)	$12,434,977	0.4%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
23	Gryphon Environmental, LLC Top agencies Army (Department of the Army)	$12,125,581	0.4%	Rank history: not on the FY2021–FY2024 lists and #90 in FY2025; up 106 since Jul 2024–Jun 2025.
24	Global Science & Technology, LLC Top agencies Commerce (Department of Commerce)	$11,964,125	0.4%	Rank history: not on the FY2021 list, #61 in FY2022, #56 in FY2023, #45 in FY2024 and #42 in FY2025; up 71 since Jul 2024–Jun 2025.
25	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)	$11,564,809	0.4%	Rank history: not on the FY2021–FY2024 lists and #97 in FY2025; up 66 since Jul 2024–Jun 2025.
26	Ashbritt Inc. Top agencies Army (Department of the Army)	$11,246,003	0.4%	Rank history: not on the FY2021–FY2024 lists and #17 in FY2025; new, not ranked in Jul 2024–Jun 2025.
27	Paragon Professional Services LLC Top agencies DOE (Department of Energy) Army (Department of the Army)	$10,514,780	0.3%	Rank history: #34 in FY2021, #35 in FY2022, #22 in FY2023, #28 in FY2024 and #16 in FY2025; down 11 since Jul 2024–Jun 2025.
28	S&K Mission Support, LLC Top agencies DOE (Department of Energy)	$10,375,427	0.3%	Rank history: not on the FY2021–FY2023 lists, #68 in FY2024 and #31 in FY2025; up 3 since Jul 2024–Jun 2025.
29	Brice Engineering, LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$8,834,076	0.3%	Rank history: #76 in FY2021, #31 in FY2022, #10 in FY2023, #24 in FY2024 and #25 in FY2025; down 11 since Jul 2024–Jun 2025.
30	Research Planning, Inc. Top agencies Commerce (Department of Commerce)	$8,549,617	0.3%	Rank history: not on the FY2021–FY2023 lists, #70 in FY2024 and #73 in FY2025; up 54 since Jul 2024–Jun 2025.
31	LDS Kemron JV 4 LLC Top agencies Army (Department of the Army)	$8,485,821	0.3%	Rank history: not on the FY2021–FY2024 lists and #34 in FY2025; new, not ranked in Jul 2024–Jun 2025.
32	Environmental Compliance Consultants, Inc. Top agencies Army (Department of the Army)	$8,218,782	0.3%	Rank history: not on the FY2021–FY2024 lists and #39 in FY2025; new, not ranked in Jul 2024–Jun 2025.
33	Parsons Corporation Through Parsons Government Services Inc. Top agencies Army (Department of the Army)	$7,786,717	0.2%	Rank history: not on the FY2021 list, #14 in FY2022, #55 in FY2023, #38 in FY2024 and #29 in FY2025; down 8 since Jul 2024–Jun 2025.
34	JFL-WCS Partners LLC Through Waste Control Specialists LLC Top agencies DOE (Department of Energy)	$7,750,000	0.2%	Rank history: not on the FY2021–FY2022 lists, #59 in FY2023, #31 in FY2024 and #49 in FY2025; down 6 since Jul 2024–Jun 2025.
35	SES Civil and Environmental LLC Top agencies USAF (Department of the Air Force) Navy (Department of the Navy)	$7,735,357	0.2%	Rank history: not on the FY2021–FY2023 lists, #40 in FY2024 and #35 in FY2025; up 6 since Jul 2024–Jun 2025.
36	Battelle Memorial Institute Top agencies HHS (Department of Health and Human Services) EPA (Environmental Protection Agency)	$7,648,998	0.2%	Rank history: #29 in FY2021, not on the FY2022–FY2023 lists, #75 in FY2024 and #47 in FY2025; up 36 since Jul 2024–Jun 2025.
37	Bhate Environmental Associates, Inc. Top agencies Army (Department of the Army) USAF (Department of the Air Force) Navy (Department of the Navy)	$7,332,126	0.2%	Rank history: #57 in FY2021, #52 in FY2022, #68 in FY2023, #87 in FY2024 and #68 in FY2025; up 75 since Jul 2024–Jun 2025.
38	Vernadero Group Inc. Top agencies DHS (Department of Homeland Security) Navy (Department of the Navy) Army (Department of the Army)	$6,734,053	0.2%	Rank history: #66 in FY2021, not on the FY2022 list, #64 in FY2023, #64 in FY2024 and not on the FY2025 list; up 35 since Jul 2024–Jun 2025.
39	GV Henson Creek LLC Top agencies DHS (Department of Homeland Security)	$6,658,663	0.2%	Rank history: not on the FY2021–FY2024 lists and #46 in FY2025; new, not ranked in Jul 2024–Jun 2025.
40	Aerostar Environmental and Construction LLC Top agencies Army (Department of the Army) Navy (Department of the Navy) USAF (Department of the Air Force)	$6,522,468	0.2%	Rank history: not on the FY2021 list, #63 in FY2022, #57 in FY2023, #39 in FY2024 and #43 in FY2025; down 8 since Jul 2024–Jun 2025.
41	Tetra Tech, Inc. 6 awardees Top agencies Army (Department of the Army) NASA (National Aeronautics and Space Administration) EPA (Environmental Protection Agency)	$6,200,763	0.2%	Rank history: #15 in FY2021, #17 in FY2022, #19 in FY2023, #19 in FY2024 and #18 in FY2025; down 27 since Jul 2024–Jun 2025.
42	Osage Nation Energy Services LLC Top agencies Army (Department of the Army)	$6,092,530	0.2%	Rank history: not on the FY2021–FY2025 lists; up 258 since Jul 2024–Jun 2025.
43	Bhate Zapata, LLC Top agencies Army (Department of the Army)	$5,938,191	0.2%	Rank history: #18 in FY2021, #68 in FY2022, #37 in FY2023, #76 in FY2024 and not on the FY2025 list; up 61 since Jul 2024–Jun 2025.
44	SOL Solutions LLC Top agencies Army (Department of the Army) Navy (Department of the Navy)	$5,926,542	0.2%	Rank history: not on the FY2021–FY2023 lists, #34 in FY2024 and #62 in FY2025; up 2 since Jul 2024–Jun 2025.
45	Bluestone Interspec JV, LLC Top agencies Navy (Department of the Navy)	$5,852,380	0.2%	Rank history: not on the FY2021–FY2022 lists, #95 in FY2023, #86 in FY2024 and #55 in FY2025; up 54 since Jul 2024–Jun 2025.
46	Bluestone Environmental Group, Inc. Top agencies Army (Department of the Army) EPA (Environmental Protection Agency) USDA (Department of Agriculture)	$5,756,797	0.2%	Rank history: not on the FY2021–FY2023 lists, #81 in FY2024 and #54 in FY2025; up 24 since Jul 2024–Jun 2025.
47	Verina Consulting Group LLC Top agencies Army (Department of the Army)	$5,608,184	0.2%	Rank history: not on the FY2021–FY2022 lists, #92 in FY2023, not on the FY2024 list and #40 in FY2025; up 38 since Jul 2024–Jun 2025.
48	Energy Technology Alliance LLC Top agencies DOE (Department of Energy)	$5,486,412	0.2%	Rank history: not on the FY2021–FY2025 lists; up 206 since Jul 2024–Jun 2025.
49	LMI Consulting, LLC Top agencies DHS (Department of Homeland Security) GSA (General Services Administration)	$5,000,183	0.2%	Rank history: not on the FY2021–FY2024 lists and #52 in FY2025; up 160 since Jul 2024–Jun 2025.
50	Toeroek Associates, Inc. Top agencies EPA (Environmental Protection Agency)	$4,855,310	0.2%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
51	Tierra Right of Way Services Ltd Top agencies DHS (Department of Homeland Security)	$4,820,684	0.2%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
52	Aleut Technical Services, LLC Top agencies EPA (Environmental Protection Agency)	$4,800,848	0.2%	Rank history: not on the FY2021–FY2023 lists, #80 in FY2024 and not on the FY2025 list; up 51 since Jul 2024–Jun 2025.
53	AECOM 4 awardees, including Environmental Management & Planning Solutions LLC, AECOM Arcadis Pfas JV and URS Group, Inc. Top agencies Army (Department of the Army) DOI (Department of the Interior)	$4,608,948	0.1%	Rank history: #1 in FY2021, #1 in FY2022, not on the FY2023–FY2024 lists and #53 in FY2025; up 1 since Jul 2024–Jun 2025.
54	Ayuda Companies Top agencies Navy (Department of the Navy) NASA (National Aeronautics and Space Administration) Army (Department of the Army)	$4,506,817	0.1%	Rank history: not on the FY2021–FY2025 lists; up 167 since Jul 2024–Jun 2025.
55	Noblis, Inc. Top agencies USAF (Department of the Air Force)	$4,277,395	0.1%	Rank history: not on the FY2021 list, #86 in FY2022, #88 in FY2023, not on the FY2024 list and #72 in FY2025; up 1 since Jul 2024–Jun 2025.
56	Olgoonik Corporation Through FPM Remediations, Inc. Top agencies USAF (Department of the Air Force) Army (Department of the Army) DHS (Department of Homeland Security)	$4,086,530	0.1%	Rank history: not on the FY2021–FY2022 lists, #71 in FY2023, #26 in FY2024 and #23 in FY2025; down 39 since Jul 2024–Jun 2025.
57	Skeo Solutions, Inc. Top agencies EPA (Environmental Protection Agency)	$4,013,278	0.1%	Rank history: #90 in FY2021, #22 in FY2022, #33 in FY2023, #27 in FY2024 and #67 in FY2025; down 24 since Jul 2024–Jun 2025.
58	Azura Consulting LLC Top agencies Commerce (Department of Commerce)	$3,858,111	0.1%	Rank history: not on the FY2021 list, #88 in FY2022, #73 in FY2023, #77 in FY2024 and #87 in FY2025; up 43 since Jul 2024–Jun 2025.
59	AECOM Technical Services, Inc. Top agencies EPA (Environmental Protection Agency) NASA (National Aeronautics and Space Administration) Navy (Department of the Navy)	$3,813,968	0.1%	Rank history: #39 in FY2021, not on the FY2022–FY2023 lists, #13 in FY2024 and #36 in FY2025; down 46 since Jul 2024–Jun 2025.
60	Bb&E, Inc. Top agencies NASA (National Aeronautics and Space Administration) DOI (Department of the Interior)	$3,748,798	0.1%	Rank history: #48 in FY2021, #55 in FY2022, #60 in FY2023, #48 in FY2024 and #38 in FY2025; down 16 since Jul 2024–Jun 2025.
61	Enhanced Environmental & Emergency Services Inc. Top agencies Navy (Department of the Navy)	$3,735,914	0.1%	Rank history: not on the FY2021–FY2024 lists and #76 in FY2025; up 73 since Jul 2024–Jun 2025.
62	Huntington Ingalls Industries, Inc. Through Newport News Nuclear Bwxt-Los Alamos LLC Top agencies DOE (Department of Energy)	$3,733,767	0.1%	Rank history: #51 in FY2021, #39 in FY2022, #39 in FY2023, not on the FY2024 list and #44 in FY2025; up 68 since Jul 2024–Jun 2025.
63	Tetra TECH EC, Inc. Top agencies DOE (Department of Energy)	$3,632,043	0.1%	Rank history: not on the FY2021–FY2023 lists, #90 in FY2024 and #61 in FY2025; down 16 since Jul 2024–Jun 2025.
64	Signature Science, LLC Top agencies DFAS (Defense Finance and Accounting Service)	$3,561,183	0.1%	Rank history: not on the FY2021–FY2024 lists and #83 in FY2025; up 45 since Jul 2024–Jun 2025.
65	Ones WTE JV Top agencies Army (Department of the Army)	$3,540,182	0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
66	Ardl Inc. Top agencies Army (Department of the Army)	$3,525,478	0.1%	Rank history: #31 in FY2021, not on the FY2022 list, #66 in FY2023, not on the FY2024 list and #93 in FY2025; up 161 since Jul 2024–Jun 2025.
67	Tekpro Support Services, LLC Top agencies DOE (Department of Energy) Army (Department of the Army)	$3,522,650	0.1%	Rank history: #78 in FY2021, #79 in FY2022, #79 in FY2023, #74 in FY2024 and #63 in FY2025; down 8 since Jul 2024–Jun 2025.
68	Chemtex Environmental Laboratory, Inc. Top agencies EPA (Environmental Protection Agency)	$3,500,000	0.1%	Rank history: not on the FY2021 list, #99 in FY2022, not on the FY2023–FY2024 lists and #57 in FY2025; up 22 since Jul 2024–Jun 2025.
69	Bonner Analytical Testing Co Top agencies EPA (Environmental Protection Agency)	$3,500,000	0.1%	Rank history: not on the FY2021 list, #94 in FY2022, not on the FY2023–FY2024 lists and #59 in FY2025; down 3 since Jul 2024–Jun 2025.
70	Genwest Systems Inc. Top agencies Commerce (Department of Commerce)	$3,492,566	0.1%	Rank history: #43 in FY2021, #51 in FY2022, #61 in FY2023, not on the FY2024 list and #75 in FY2025; up 79 since Jul 2024–Jun 2025.
71	Charter Contracting Company, LLC Top agencies Army (Department of the Army)	$3,470,852	0.1%	Rank history: not on the FY2021–FY2023 lists, #35 in FY2024 and not on the FY2025 list; new, not ranked in Jul 2024–Jun 2025.
72	Cape Remediation, LLC Top agencies EPA (Environmental Protection Agency) Army (Department of the Army)	$3,447,262	0.1%	Rank history: not on the FY2021–FY2022 lists, #15 in FY2023, #49 in FY2024 and #48 in FY2025; down 30 since Jul 2024–Jun 2025.
73	Teya Support Services LLC Top agencies Navy (Department of the Navy)	$3,425,136	0.1%	Rank history: not on the FY2021–FY2025 lists; up 122 since Jul 2024–Jun 2025.
74	Hana Engineers & Consultants LLC Top agencies EPA (Environmental Protection Agency) Army (Department of the Army)	$3,275,729	0.1%	Rank history: not on the FY2021–FY2023 lists, #60 in FY2024 and not on the FY2025 list; up 54 since Jul 2024–Jun 2025.
75	Aptim-Amentum Alaska Decommissioning LLC Top agencies Army (Department of the Army)	$3,229,806	0.1%	Rank history: not on the FY2021–FY2022 lists, #8 in FY2023, #11 in FY2024 and #69 in FY2025; down 60 since Jul 2024–Jun 2025.
76	Arcadis U.s., Inc. Top agencies Army (Department of the Army)	$3,216,473	0.1%	Rank history: not on the FY2021–FY2024 lists and #33 in FY2025; down 31 since Jul 2024–Jun 2025.
77	ICF International Inc. Through ICF Incorporated, L.L.C. Top agencies EPA (Environmental Protection Agency) DOI (Department of the Interior)	$3,141,811	0.1%	Rank history: not on the FY2021–FY2023 lists, #43 in FY2024 and #66 in FY2025; down 16 since Jul 2024–Jun 2025.
78	Tehama ECS LLC Top agencies Army (Department of the Army) DOI (Department of the Interior)	$3,121,293	0.1%	Rank history: not on the FY2021–FY2025 lists; up 282 since Jul 2024–Jun 2025.
79	Industrial Economics Inc. Top agencies DOE (Department of Energy) EPA (Environmental Protection Agency) DOI (Department of the Interior)	$3,088,926	0.1%	Rank history: #95 in FY2021, #66 in FY2022, #51 in FY2023, #56 in FY2024 and #74 in FY2025; up 26 since Jul 2024–Jun 2025.
80	Brice Solutions, LLC Top agencies DHS (Department of Homeland Security) Army (Department of the Army)	$3,038,396	0.1%	Rank history: not on the FY2021–FY2023 lists, #55 in FY2024 and #86 in FY2025; down 43 since Jul 2024–Jun 2025.
81	General Dynamics Corporation Through General Dynamics Information Technology, Inc. Top agencies EPA (Environmental Protection Agency)	$3,009,199	0.1%	Rank history: #37 in FY2021, not on the FY2022 list, #63 in FY2023, #42 in FY2024 and not on the FY2025 list; down 16 since Jul 2024–Jun 2025.
82	Dawson Solutions LLC Top agencies DHS (Department of Homeland Security) USAF (Department of the Air Force) Army (Department of the Army)	$2,896,437	0.1%	Rank history: not on the FY2021–FY2022 lists, #69 in FY2023, #9 in FY2024 and #85 in FY2025; new, not ranked in Jul 2024–Jun 2025.
83	Renova-Sovereign Joint Venture Top agencies Army (Department of the Army)	$2,791,650	0.1%	Rank history: #64 in FY2021, #75 in FY2022, not on the FY2023–FY2024 lists and #96 in FY2025; new, not ranked in Jul 2024–Jun 2025.
84	WSP USA Solutions Inc 2 awardees Top agencies GSA (General Services Administration) Army (Department of the Army)	$2,751,162	0.1%	Rank history: not on the FY2021–FY2025 lists; up 103 since Jul 2024–Jun 2025.
85	Environmental Research Group LLC Top agencies Army (Department of the Army) Navy (Department of the Navy) VA (Department of Veterans Affairs)	$2,738,796	0.1%	Rank history: not on the FY2021–FY2022 lists, #76 in FY2023, #97 in FY2024 and not on the FY2025 list; up 70 since Jul 2024–Jun 2025.
86	Grunley Construction Co., Inc. Top agencies Army (Department of the Army)	$2,661,448	0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
87	Asgn Incorporated Through ECS Federal, LLC Top agencies Commerce (Department of Commerce)	$2,656,000	0.1%	Rank history: not on the FY2021–FY2023 lists, #63 in FY2024 and #51 in FY2025; down 47 since Jul 2024–Jun 2025.
88	Claene Group LLC Top agencies Army (Department of the Army)	$2,623,510	0.1%	Rank history: not on the FY2021–FY2025 lists; up 38 since Jul 2024–Jun 2025.
89	Copperhead Environmental Consulting Inc. Top agencies DOI (Department of the Interior)	$2,593,604	0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
90	Koman ECO Ageiss JV LLC Top agencies USAF (Department of the Air Force) Army (Department of the Army)	$2,570,061	0.1%	Rank history: not on the FY2021–FY2024 lists and #84 in FY2025; down 3 since Jul 2024–Jun 2025.
91	Q & A Diversified LLC Top agencies Army (Department of the Army)	$2,568,247	0.1%	Rank history: not on the FY2021–FY2024 lists and #58 in FY2025; down 36 since Jul 2024–Jun 2025.
92	Chenega Reliable Services LLC Top agencies Army (Department of the Army)	$2,540,941	0.1%	Rank history: not on the FY2021–FY2025 lists; up 28 since Jul 2024–Jun 2025.
93	Marstel-Day, LLC Top agencies Navy (Department of the Navy) DOI (Department of the Interior)	$2,525,975	0.1%	Rank history: not on the FY2021 list, #93 in FY2022, #58 in FY2023, not on the FY2024 list and #98 in FY2025; up 78 since Jul 2024–Jun 2025.
94	Bristol Bay Native Corporation Through Aerostar SES LLC Top agencies Army (Department of the Army)	$2,491,260	0.1%	Rank history: not on the FY2021–FY2022 lists, #89 in FY2023, #99 in FY2024 and not on the FY2025 list; down 18 since Jul 2024–Jun 2025.
95	Link Technologies Inc. Top agencies DOE (Department of Energy)	$2,472,000	0.1%	Rank history: #60 in FY2021, #62 in FY2022, #62 in FY2023, #52 in FY2024 and #50 in FY2025; down 24 since Jul 2024–Jun 2025.
96	Ea-Bay West Joint Venture LLC Top agencies Army (Department of the Army)	$2,398,187	0.1%	Rank history: not on the FY2021–FY2022 lists, #83 in FY2023, #58 in FY2024 and not on the FY2025 list; down 16 since Jul 2024–Jun 2025.
97	Propel Solutions LLC Top agencies Commerce (Department of Commerce)	$2,375,984	0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
98	North Wind General Contractors LLC Top agencies DOI (Department of the Interior)	$2,352,013	0.1%	Rank history: not on the FY2021–FY2024 lists and #89 in FY2025; up 2 since Jul 2024–Jun 2025.
99	Credere Associates, LLC Top agencies Army (Department of the Army)	$2,343,469	0.1%	Rank history: #55 in FY2021 and not on the FY2022–FY2025 lists; up 132 since Jul 2024–Jun 2025.
100	Haztrain Inc. Top agencies Army (Department of the Army)	$2,342,978	0.1%	Rank history: not on the FY2021–FY2025 lists; up 38 since Jul 2024–Jun 2025.

Show 75 more

100 of 587 contractors listed here. See the rest on GovTribe.

Rankings for the codes under PSC F9

Code	Net obligations	Largest contractor
F999 Other Environmental Services, Studies, and Analytical Support	$2,814,022,609	Amentum Holdings, Inc.

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 $3.19 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 F9 contractors in Jul 2025–Jun 2026?

1. Amentum Holdings, Inc. ($1.49B), 2. L3Harris Technologies, Inc. ($131M), 3. Hanford Laboratory Management and Integration LLC ($107M), 4. West Valley Cleanup Alliance, LLC ($105M), 5. Guidehouse Inc. ($75.1M), 6. BWX Technologies, Inc. ($66.9M), 7. Hydrogeologic, Inc. ($56.9M), 8. Navarro Research and Engineering, Inc. ($54M), 9. Sevenson Environmental Services, Inc. ($41.1M), 10. Leidos Holdings, Inc. ($31.9M).

On GovTribe

Research every contractor on this list

Every contract, task order and IDV they hold
Their subsidiaries, teammates and competitors
Open opportunities they're positioned for
Alerts when they win new work

Try for free Login