Top 100 Contractors in PSC F: Natural Resources Management, FY2024

Name: Top 100 Contractors in PSC F: Natural Resources Management, FY2024
Creator: GovTribe

Parent companies by net contract obligations Oct 1, 2023 – Sep 30, 2024 Code page on GovTribe

The top 10 won 33% of FY2024 PSC F contract dollars

Contract obligations: $9,044,147,760 Net of deobligations, by contracts coded PSC F or a code under it
Contractors: 5,136 Parent companies with an obligation
Largest contractor: United Cleanup Oak Ridge LLC $592 million, 6.2% 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	United Cleanup Oak Ridge LLC Top agencies DOE (Department of Energy)	$592,276,416	6.2%	Rank history: not on the FY2021–FY2022 lists, #2 in FY2023 and #9 in FY2025; up 1 since FY2023.
2	Bechtel Corp 3 awardees, including Bechtel National, Inc. and Bechtel Parsons Blue Grass, A Joint Venture Top agencies Army (Department of the Army)	$545,815,024	5.7%	Rank history: #2 in FY2021, #1 in FY2022, #1 in FY2023 and #4 in FY2025; down 1 since FY2023.
3	Sevenson Environmental Services, Inc. Top agencies EPA (Environmental Protection Agency) Army (Department of the Army)	$453,298,956	4.7%	Rank history: #17 in FY2021, #6 in FY2022, #14 in FY2023 and #5 in FY2025; up 11 since FY2023.
4	Jacobs Engineering Group Inc. 5 awardees, including Idaho Environmental Coalition LLC, Amentum Technology, Inc. and Ch2M Hill, Inc. Top agencies DOE (Department of Energy) Army (Department of the Army) EPA (Environmental Protection Agency)	$436,736,797	4.6%	Rank history: #13 in FY2021, #30 in FY2022, #3 in FY2023 and not on the FY2025 list; down 1 since FY2023.
5	Bechtel Parsons Blue Grass, A Joint Venture Top agencies Army (Department of the Army)	$354,772,551	3.7%	Rank history: not on the FY2021–FY2023 lists and #3 in FY2025; new.
6	HUI Huliau Technology Services LLC Top agencies Army (Department of the Army)	$216,505,988	2.3%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
7	EA Engineering Science and Technology Inc. PBC Top agencies EPA (Environmental Protection Agency) Army (Department of the Army) USAF (Department of the Air Force)	$196,184,501	2.1%	Rank history: not on the FY2021–FY2023 lists and #12 in FY2025; new.
8	Hydrogeologic, Inc. Top agencies EPA (Environmental Protection Agency) Army (Department of the Army) Navy (Department of the Navy)	$174,407,588	1.8%	Rank history: #4 in FY2021, #5 in FY2022, #5 in FY2023 and #8 in FY2025; down 3 since FY2023.
9	Hanford Laboratory Management and Integration LLC Top agencies DOE (Department of Energy)	$120,000,839	1.3%	Rank history: #20 in FY2021, #8 in FY2022, #10 in FY2023 and #13 in FY2025; up 1 since FY2023.
10	AECOM Technical Services, Inc. Top agencies EPA (Environmental Protection Agency) Army (Department of the Army) Navy (Department of the Navy)	$114,034,218	1.2%	Rank history: #89 in FY2021, not on the FY2022–FY2023 lists and #19 in FY2025; returned.
11	Idaho Environmental Coalition LLC Top agencies DOE (Department of Energy)	$99,813,459	1.0%	Rank history: not on the FY2021–FY2023 lists and #17 in FY2025; new.
12	Dawson Solutions LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$93,352,560	1.0%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; up 170 since FY2023.
13	Guidehouse Inc. Through Aptim Federal Services, LLC Top agencies EPA (Environmental Protection Agency) DOE (Department of Energy) Army (Department of the Army)	$92,622,897	1.0%	Rank history: not on the FY2021–FY2023 lists and #7 in FY2025; new.
14	Kemron Environmental Services Inc. 2 awardees, including Kemron / Arrowhead JV, LLC Top agencies EPA (Environmental Protection Agency) Army (Department of the Army)	$92,543,750	1.0%	Rank history: not on the FY2021–FY2023 lists and #45 in FY2025; new.
15	Sierra Tahoe Environmental Management, LLC Top agencies USDA (Department of Agriculture)	$89,416,002	0.9%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
16	North Wind Portage, Inc. Top agencies Army (Department of the Army) DOE (Department of Energy)	$83,235,513	0.9%	Rank history: not on the FY2021 list, #24 in FY2022, not on the FY2023 list and #16 in FY2025; up 119 since FY2023.
17	Tetra Tech, Inc. 15 awardees, including Tetra TECH EC, Inc. and Ard, Inc. Top agencies EPA (Environmental Protection Agency) Army (Department of the Army) USAID (US Agency for International Development)	$81,464,289	0.9%	Rank history: #16 in FY2021, #13 in FY2022, #17 in FY2023 and #14 in FY2025; unchanged since FY2023.
18	Helicopter Express LLC Top agencies USDA (Department of Agriculture)	$80,654,223	0.8%	Rank history: not on the FY2021 list, #33 in FY2022, #38 in FY2023 and #15 in FY2025; up 20 since FY2023.
19	BWX Technologies, Inc. 2 awardees, including Nuclear Fuel Services Inc. and Bwxt Nuclear Operations Group, Inc. Top agencies DOE (Department of Energy)	$74,041,448	0.8%	Rank history: not on the FY2021 list, #35 in FY2022, #7 in FY2023 and #18 in FY2025; down 12 since FY2023.
20	Environmental Restoration LLC Top agencies EPA (Environmental Protection Agency) Army (Department of the Army) DOJ (Department of Justice)	$71,227,228	0.7%	Rank history: #8 in FY2021, #4 in FY2022, #8 in FY2023 and #10 in FY2025; down 12 since FY2023.
21	Leisnoi Diversified-Kemron 8A JV, LLC Top agencies EPA (Environmental Protection Agency) Army (Department of the Army)	$69,243,331	0.7%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
22	Amentum Technology, Inc. Top agencies Army (Department of the Army) Navy (Department of the Navy)	$63,983,972	0.7%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
23	Eastern Research Group Inc. Top agencies EPA (Environmental Protection Agency) GSA (General Services Administration) DOI (Department of the Interior)	$62,478,426	0.7%	Rank history: #49 in FY2021, #42 in FY2022, #28 in FY2023 and #34 in FY2025; up 5 since FY2023.
24	Brice Civil Constructors Inc. Top agencies Army (Department of the Army)	$60,085,560	0.6%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
25	Aptim-Amentum Alaska Decommissioning LLC Top agencies Army (Department of the Army)	$58,730,468	0.6%	Rank history: not on the FY2021–FY2022 lists, #15 in FY2023 and not on the FY2025 list; down 10 since FY2023.
26	Environmental Chemical Corporation 3 awardees, including ECC Environmental LLC Top agencies Army (Department of the Army) EPA (Environmental Protection Agency) USAF (Department of the Air Force)	$52,985,762	0.6%	Rank history: #22 in FY2021, #51 in FY2022, #26 in FY2023 and #37 in FY2025; unchanged since FY2023.
27	Navarro Research and Engineering, Inc. Top agencies DOE (Department of Energy) Army (Department of the Army)	$52,743,762	0.6%	Rank history: #18 in FY2021, #21 in FY2022, #24 in FY2023 and #21 in FY2025; down 3 since FY2023.
28	ECC Constructors LLC Top agencies Army (Department of the Army)	$47,726,648	0.5%	Rank history: not on the FY2021–FY2023 lists and #1 in FY2025; new.
29	10 Tanker Air Carrier LLC Top agencies USDA (Department of Agriculture)	$47,486,955	0.5%	Rank history: not on the FY2021–FY2023 lists and #20 in FY2025; new.
30	Cook Inlet Region Inc. 6 awardees, including North Wind Portage, Inc., North Wind-Ea JV, LLC and North Wind Construction Services, LLC Top agencies DOE (Department of Energy) Army (Department of the Army) DOI (Department of the Interior)	$41,518,087	0.4%	Rank history: #6 in FY2021, #9 in FY2022, #18 in FY2023 and not on the FY2025 list; down 12 since FY2023.
31	Coulson Aviation (Usa), Inc. Top agencies USDA (Department of Agriculture)	$41,350,832	0.4%	Rank history: not on the FY2021 list, #69 in FY2022, #78 in FY2023 and #31 in FY2025; up 47 since FY2023.
32	Aero Air, LLC Top agencies USDA (Department of Agriculture)	$40,369,194	0.4%	Rank history: not on the FY2021–FY2022 lists, #91 in FY2023 and #30 in FY2025; up 59 since FY2023.
33	Hgl-Aptim JV LLC Top agencies Army (Department of the Army) DLA (Defense Logistics Agency)	$37,296,027	0.4%	Rank history: #52 in FY2021, #31 in FY2022, #58 in FY2023 and #50 in FY2025; up 25 since FY2023.
34	Brink Brothers Inc. Top agencies USDA (Department of Agriculture)	$35,084,033	0.4%	Rank history: not on the FY2021–FY2022 lists, #95 in FY2023 and #71 in FY2025; up 61 since FY2023.
35	Neptune Aviation Services, Inc. Top agencies USDA (Department of Agriculture) DOI (Department of the Interior)	$34,401,470	0.4%	Rank history: #73 in FY2021, #54 in FY2022, #69 in FY2023 and #33 in FY2025; up 34 since FY2023.
36	CDM Federal Programs Corporation Top agencies EPA (Environmental Protection Agency)	$33,783,649	0.4%	Rank history: not on the FY2021–FY2023 lists and #38 in FY2025; up 133 since FY2023.
37	EQ & CH Remediation Top agencies EPA (Environmental Protection Agency)	$32,786,469	0.3%	Rank history: #67 in FY2021, #97 in FY2022, #93 in FY2023 and not on the FY2025 list; up 56 since FY2023.
38	Paragon Professional Services LLC Top agencies DOE (Department of Energy) EPA (Environmental Protection Agency) Army (Department of the Army)	$32,536,300	0.3%	Rank history: #76 in FY2021, #90 in FY2022, #32 in FY2023 and #29 in FY2025; down 6 since FY2023.
39	Aero-Flite, Inc. Top agencies USDA (Department of Agriculture)	$32,187,053	0.3%	Rank history: #99 in FY2021, not on the FY2022–FY2023 lists and #43 in FY2025; up 64 since FY2023.
40	Inmar Clearing Inc. Through Inmar RX Solutions Inc. Top agencies HHS (Department of Health and Human Services)	$29,999,980	0.3%	Rank history: not on the FY2021–FY2022 lists, #37 in FY2023 and not on the FY2025 list; down 3 since FY2023.
41	C M C, Inc. Top agencies EPA (Environmental Protection Agency)	$29,861,520	0.3%	Rank history: #70 in FY2021, #29 in FY2022, #25 in FY2023 and not on the FY2025 list; down 16 since FY2023.
42	Croman Corp Top agencies USDA (Department of Agriculture)	$29,182,861	0.3%	Rank history: not on the FY2021–FY2023 lists and #42 in FY2025; new.
43	Pika International Inc. 2 awardees, including Pika-Pirnie JV LLC Top agencies Army (Department of the Army)	$29,033,053	0.3%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
44	Leidos Holdings, Inc. 5 awardees, including Leidos, Inc. Top agencies DHS (Department of Homeland Security) Army (Department of the Army) USAF (Department of the Air Force)	$28,111,074	0.3%	Rank history: #29 in FY2021, #34 in FY2022, #31 in FY2023 and #39 in FY2025; down 13 since FY2023.
45	Billings Flying Service LLC Top agencies USDA (Department of Agriculture)	$26,998,865	0.3%	Rank history: not on the FY2021 list, #19 in FY2022, #39 in FY2023 and #32 in FY2025; down 6 since FY2023.
46	Weston Solutions Holdings, Inc. 2 awardees, including Weston Solutions Inc. Top agencies Army (Department of the Army) EPA (Environmental Protection Agency)	$26,975,661	0.3%	Rank history: #38 in FY2021, #43 in FY2022, #65 in FY2023 and not on the FY2025 list; up 19 since FY2023.
47	Brice Engineering, LLC Top agencies Army (Department of the Army) DHS (Department of Homeland Security) USAF (Department of the Air Force)	$26,559,683	0.3%	Rank history: #43 in FY2021, #25 in FY2022, #12 in FY2023 and #40 in FY2025; down 35 since FY2023.
48	J.f. Brennan Company, Inc. Top agencies EPA (Environmental Protection Agency)	$26,534,443	0.3%	Rank history: not on the FY2021 list, #7 in FY2022, not on the FY2023 list and not on the FY2025 list; up 215 since FY2023.
49	Environmental Quality Management, Inc. Top agencies EPA (Environmental Protection Agency)	$26,213,715	0.3%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
50	Fpm-Aecom JV1 2 awardees, including Fpm-Aecom JV2 Top agencies Army (Department of the Army) USAF (Department of the Air Force) DOE (Department of Energy)	$25,550,848	0.3%	Rank history: not on the FY2021 list, #88 in FY2022, #20 in FY2023 and not on the FY2025 list; down 30 since FY2023.
51	Precision, LLC Top agencies USDA (Department of Agriculture)	$25,422,640	0.3%	Rank history: not on the FY2021–FY2023 lists and #35 in FY2025; up 159 since FY2023.
52	Rotak LLC Top agencies USDA (Department of Agriculture)	$25,231,828	0.3%	Rank history: not on the FY2021–FY2022 lists, #71 in FY2023 and #26 in FY2025; up 19 since FY2023.
53	Hgl-Er JV LLC Top agencies Army (Department of the Army)	$24,051,422	0.3%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
54	Conti Federal Services, LLC Top agencies EPA (Environmental Protection Agency)	$23,990,270	0.3%	Rank history: not on the FY2021–FY2023 lists and #52 in FY2025; new.
55	Ch2M Hill, Inc. Top agencies EPA (Environmental Protection Agency) USAF (Department of the Air Force) Army (Department of the Army)	$23,832,208	0.2%	Rank history: not on the FY2021 list, #37 in FY2022, not on the FY2023 list and #82 in FY2025; up 302 since FY2023.
56	Helicopter Transport Services, LLC Top agencies USDA (Department of Agriculture)	$22,796,393	0.2%	Rank history: not on the FY2021 list, #11 in FY2022, #49 in FY2023 and #11 in FY2025; down 7 since FY2023.
57	Siller Helicopters, LLC Top agencies USDA (Department of Agriculture)	$21,765,498	0.2%	Rank history: not on the FY2021 list, #41 in FY2022, #46 in FY2023 and #24 in FY2025; down 11 since FY2023.
58	OCH JV Top agencies EPA (Environmental Protection Agency)	$21,593,743	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
59	Brice Solutions, LLC Top agencies DOT (Department of Transportation) DHS (Department of Homeland Security) Army (Department of the Army)	$21,448,259	0.2%	Rank history: not on the FY2021–FY2022 lists, #96 in FY2023 and not on the FY2025 list; up 37 since FY2023.
60	Nobis Engineering, Inc. Top agencies EPA (Environmental Protection Agency)	$21,358,393	0.2%	Rank history: #71 in FY2021, #70 in FY2022, not on the FY2023 list and not on the FY2025 list; up 261 since FY2023.
61	Ahtna-Arcadis 8(A) JV, LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$20,606,413	0.2%	Rank history: not on the FY2021–FY2022 lists, #60 in FY2023 and not on the FY2025 list; down 1 since FY2023.
62	Helimax Aviation LLC Top agencies USDA (Department of Agriculture)	$19,800,623	0.2%	Rank history: not on the FY2021–FY2023 lists and #54 in FY2025; new.
63	Arctic Slope Regional Corporation 2 awardees, including Environmental Quality Management, Inc. and EQM Services, LLC Top agencies EPA (Environmental Protection Agency)	$19,665,055	0.2%	Rank history: #9 in FY2021, #36 in FY2022, #9 in FY2023 and #6 in FY2025; down 54 since FY2023.
64	ECC Environmental LLC Top agencies Navy (Department of the Navy) Army (Department of the Army)	$19,204,924	0.2%	Rank history: not on the FY2021–FY2023 lists and #70 in FY2025; new.
65	Bay West LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force) EPA (Environmental Protection Agency)	$19,155,348	0.2%	Rank history: #96 in FY2021, not on the FY2022 list, #56 in FY2023 and #53 in FY2025; down 9 since FY2023.
66	Couvillion Group LLC Top agencies DHS (Department of Homeland Security) DOI (Department of the Interior)	$17,560,000	0.2%	Rank history: #61 in FY2021, #45 in FY2022, #45 in FY2023 and #49 in FY2025; down 21 since FY2023.
67	Olgoonik Corporation Through FPM Remediations, Inc. Top agencies Army (Department of the Army) USAF (Department of the Air Force) DHS (Department of Homeland Security)	$17,207,112	0.2%	Rank history: #66 in FY2021, not on the FY2022–FY2023 lists and #72 in FY2025; up 81 since FY2023.
68	Sustainment & Restoration Services, LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force) Navy (Department of the Navy)	$17,134,091	0.2%	Rank history: not on the FY2021–FY2023 lists and #44 in FY2025; new.
69	Patrick Environmental Inc. Top agencies USDA (Department of Agriculture)	$16,305,652	0.2%	Rank history: not on the FY2021 list, #92 in FY2022, #80 in FY2023 and #51 in FY2025; up 11 since FY2023.
70	Environmental Rail Solutions Inc. Top agencies Army (Department of the Army)	$16,244,600	0.2%	Rank history: not on the FY2021–FY2022 lists, #79 in FY2023 and not on the FY2025 list; up 9 since FY2023.
71	Leisnoi Diversified Services, LLC Top agencies EPA (Environmental Protection Agency) Army (Department of the Army)	$16,014,806	0.2%	Rank history: #75 in FY2021, #75 in FY2022, not on the FY2023 list and not on the FY2025 list; up 46 since FY2023.
72	Grayback Forestry Inc. Top agencies USDA (Department of Agriculture) DOI (Department of the Interior)	$15,857,470	0.2%	Rank history: not on the FY2021–FY2023 lists and #48 in FY2025; new.
73	Parsons Corporation Through Parsons Government Services Inc. Top agencies OSD (Office of the Secretary of Defense) MDA (DOD Missile Defense Agency) Army (Department of the Army)	$15,715,135	0.2%	Rank history: #64 in FY2021, #20 in FY2022, #53 in FY2023 and #47 in FY2025; down 20 since FY2023.
74	Firestorm Wildland Fire Suppression, Inc. Top agencies USDA (Department of Agriculture) DOI (Department of the Interior)	$15,020,605	0.2%	Rank history: not on the FY2021 list, #68 in FY2022, #85 in FY2023 and #63 in FY2025; up 11 since FY2023.
75	Pacific OASIS Inc Top agencies USDA (Department of Agriculture)	$14,959,568	0.2%	Rank history: not on the FY2021–FY2023 lists and #74 in FY2025; up 35 since FY2023.
76	P.j. Helicopters, Inc. Top agencies USDA (Department of Agriculture)	$14,901,839	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
77	Cape Environmental Management Inc. Top agencies Army (Department of the Army) USAF (Department of the Air Force) Navy (Department of the Navy)	$14,885,956	0.2%	Rank history: #19 in FY2021, #15 in FY2022, #77 in FY2023 and #65 in FY2025; unchanged since FY2023.
78	SOL Solutions LLC Top agencies Army (Department of the Army) Navy (Department of the Navy)	$14,650,957	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
79	Promethean Operating I LLC Top agencies DOI (Department of the Interior)	$14,436,658	0.2%	Rank history: not on the FY2021–FY2023 lists and #76 in FY2025; new.
80	Spur Aviation Services, LC Top agencies USDA (Department of Agriculture) DOI (Department of the Interior)	$14,239,856	0.1%	Rank history: not on the FY2021–FY2023 lists and #84 in FY2025; up 91 since FY2023.
81	Cape-Weston JV1 LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$14,231,711	0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; up 357 since FY2023.
82	Western Pilot Service Inc. Top agencies DOI (Department of the Interior) USDA (Department of Agriculture)	$14,094,805	0.1%	Rank history: not on the FY2021–FY2023 lists and #69 in FY2025; new.
83	Skeo Solutions, Inc. Top agencies EPA (Environmental Protection Agency)	$14,074,259	0.1%	Rank history: not on the FY2021 list, #59 in FY2022, #81 in FY2023 and not on the FY2025 list; down 2 since FY2023.
84	Enviro-Fix Solutions LLC Top agencies Army (Department of the Army)	$14,048,833	0.1%	Rank history: not on the FY2021–FY2022 lists, #100 in FY2023 and #73 in FY2025; up 16 since FY2023.
85	Imperial Forestry, Incorporated Top agencies USDA (Department of Agriculture) DOI (Department of the Interior)	$13,934,411	0.1%	Rank history: #79 in FY2021, #74 in FY2022, #63 in FY2023 and #99 in FY2025; down 22 since FY2023.
86	Capitol Helicopters, Inc. Top agencies USDA (Department of Agriculture)	$13,869,775	0.1%	Rank history: not on the FY2021–FY2023 lists and #46 in FY2025; up 43 since FY2023.
87	Seres-Arcadis SB JV, LLC Top agencies Army (Department of the Army)	$13,539,151	0.1%	Rank history: not on the FY2021–FY2022 lists, #99 in FY2023 and not on the FY2025 list; up 12 since FY2023.
88	Ponderosa Aviation Inc. Top agencies USDA (Department of Agriculture) DOI (Department of the Interior)	$13,501,886	0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; up 46 since FY2023.
89	Weston-Techlaw JV LLC Top agencies EPA (Environmental Protection Agency)	$13,298,219	0.1%	Rank history: not on the FY2021–FY2022 lists, #74 in FY2023 and not on the FY2025 list; down 15 since FY2023.
90	North Pacific Forestry Inc. Top agencies USDA (Department of Agriculture)	$13,109,832	0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; up 74 since FY2023.
91	JFL-WCS Partners LLC Through Waste Control Specialists LLC Top agencies DOE (Department of Energy) EPA (Environmental Protection Agency)	$13,086,546	0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; up 85 since FY2023.
92	General Dynamics Corporation Through General Dynamics Information Technology, Inc. Top agencies EPA (Environmental Protection Agency)	$13,057,411	0.1%	Rank history: #80 in FY2021, not on the FY2022–FY2023 lists and not on the FY2025 list; up 101 since FY2023.
93	A.i.s., Inc. Top agencies Commerce (Department of Commerce)	$12,922,370	0.1%	Rank history: not on the FY2021–FY2023 lists and #97 in FY2025; up 97 since FY2023.
94	Oneida Nation 2 awardees, including Sustainment & Restoration Services, LLC Top agencies Army (Department of the Army) Navy (Department of the Navy)	$12,912,290	0.1%	Rank history: #21 in FY2021, #16 in FY2022, #21 in FY2023 and not on the FY2025 list; down 73 since FY2023.
95	G E Forestry, Inc. Top agencies USDA (Department of Agriculture) DOI (Department of the Interior)	$12,888,960	0.1%	Rank history: #84 in FY2021, #72 in FY2022, #87 in FY2023 and not on the FY2025 list; down 8 since FY2023.
96	Jacobs Government Services Company 6 awardees, including Jacobs Engineering Group Inc., Jacobs Usae Joint Venture and Amentum Technology, Inc. Top agencies EPA (Environmental Protection Agency) DECA (Defense Commissary Agency) Army (Department of the Army)	$12,479,403	0.1%	Rank history: not on the FY2021–FY2023 lists and #64 in FY2025; up 36 since FY2023.
97	Research Triangle Institute Top agencies EPA (Environmental Protection Agency) Commerce (Department of Commerce)	$12,400,167	0.1%	Rank history: not on the FY2021 list, #95 in FY2022, #83 in FY2023 and not on the FY2025 list; down 14 since FY2023.
98	Ponderosa Timberland, Inc. Top agencies USDA (Department of Agriculture) DOI (Department of the Interior)	$12,201,587	0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; up 38 since FY2023.
99	Omalley Brothers Corp Top agencies USDA (Department of Agriculture)	$11,972,398	0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
100	Heli-1 Corp Top agencies USDA (Department of Agriculture)	$11,942,140	0.1%	Rank history: not on the FY2021–FY2023 lists and #79 in FY2025; new.

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100 of 5,136 contractors listed here. See the rest on GovTribe.

Rankings for the codes under PSC F

Code	Net obligations	Largest contractor
F1 Environmental Systems Protection	$3,396,546,538	Bechtel Corp
F9 Natural Resources – Other Services	$3,055,571,033	United Cleanup Oak Ridge LLC
F0 Natural Resource Conservation Services	$2,592,030,189	Sierra Tahoe Environmental Management, 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 $9.57 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 2024 ran Oct 1, 2023 – Sep 30, 2024. 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 FY2023. "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 FY2023 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 FY2024?

1. United Cleanup Oak Ridge LLC ($592M), 2. Bechtel Corp ($546M), 3. Sevenson Environmental Services, Inc. ($453M), 4. Jacobs Engineering Group Inc. ($437M), 5. Bechtel Parsons Blue Grass, A Joint Venture ($355M), 6. HUI Huliau Technology Services LLC ($217M), 7. EA Engineering Science and Technology Inc. PBC ($196M), 8. Hydrogeologic, Inc. ($174M), 9. Hanford Laboratory Management and Integration LLC ($120M), 10. AECOM Technical Services, Inc. ($114M).

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