Top 100 Contractors in PSC F999: Other Environmental Services, Studies, and Analytical Support, FY2024

Name: Top 100 Contractors in PSC F999: Other Environmental Services, Studies, and Analytical Support, FY2024
Creator: GovTribe

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

The top 10 won 57% of FY2024 PSC F999 contract dollars

Contract obligations: $3,055,571,033 Net of deobligations, by contracts coded PSC F999
Contractors: 747 Parent companies with an obligation
Largest contractor: United Cleanup Oak Ridge LLC $592 million, 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	United Cleanup Oak Ridge LLC Top agencies DOE (Department of Energy)	$592,276,416	18.3%	Rank history: not on the FY2021–FY2022 lists, #1 in FY2023 and #3 in FY2025; unchanged since FY2023.
2	Jacobs Engineering Group Inc. 3 awardees, including Idaho Environmental Coalition LLC Top agencies DOE (Department of Energy)	$397,228,588	12.3%	Rank history: #19 in FY2021, #85 in FY2022, #4 in FY2023 and not on the FY2025 list; up 2 since FY2023.
3	HUI Huliau Technology Services LLC Top agencies Army (Department of the Army)	$216,505,988	6.7%	Rank history: not on the FY2021–FY2023 lists and #45 in FY2025; new.
4	Sevenson Environmental Services, Inc. Top agencies EPA (Environmental Protection Agency) Army (Department of the Army)	$121,256,923	3.8%	Rank history: #8 in FY2021, #2 in FY2022, #9 in FY2023 and #10 in FY2025; up 5 since FY2023.
5	Hanford Laboratory Management and Integration LLC Top agencies DOE (Department of Energy)	$120,000,839	3.7%	Rank history: #9 in FY2021, #4 in FY2022, #6 in FY2023 and #5 in FY2025; up 1 since FY2023.
6	Idaho Environmental Coalition LLC Top agencies DOE (Department of Energy)	$99,813,459	3.1%	Rank history: not on the FY2021–FY2023 lists and #6 in FY2025; new.
7	Guidehouse Inc. Through Aptim Federal Services, LLC Top agencies EPA (Environmental Protection Agency) DOE (Department of Energy) Army (Department of the Army)	$80,834,727	2.5%	Rank history: not on the FY2021–FY2023 lists and #4 in FY2025; new.
8	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	2.3%	Rank history: not on the FY2021 list, #15 in FY2022, #3 in FY2023 and #7 in FY2025; down 5 since FY2023.
9	Dawson Solutions LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$69,829,399	2.2%	Rank history: not on the FY2021–FY2022 lists, #69 in FY2023 and #85 in FY2025; up 60 since FY2023.
10	Hydrogeologic, Inc. Top agencies Army (Department of the Army) EPA (Environmental Protection Agency) USAF (Department of the Air Force)	$69,244,816	2.1%	Rank history: #4 in FY2021, #8 in FY2022, #7 in FY2023 and #8 in FY2025; down 3 since FY2023.
11	Aptim-Amentum Alaska Decommissioning LLC Top agencies Army (Department of the Army)	$58,730,468	1.8%	Rank history: not on the FY2021–FY2022 lists, #8 in FY2023 and #69 in FY2025; down 3 since FY2023.
12	ECC Constructors LLC Top agencies Army (Department of the Army)	$47,726,648	1.5%	Rank history: not on the FY2021–FY2023 lists and #1 in FY2025; new.
13	AECOM Technical Services, Inc. Top agencies EPA (Environmental Protection Agency) Army (Department of the Army) DHS (Department of Homeland Security)	$39,809,399	1.2%	Rank history: #39 in FY2021, not on the FY2022–FY2023 lists and #36 in FY2025; returned.
14	Navarro Research and Engineering, Inc. Top agencies DOE (Department of Energy)	$38,322,959	1.2%	Rank history: #12 in FY2021, #13 in FY2022, #11 in FY2023 and #12 in FY2025; down 3 since FY2023.
15	EA Engineering Science and Technology Inc. PBC 2 awardees Top agencies Army (Department of the Army) EPA (Environmental Protection Agency) USAF (Department of the Air Force)	$35,141,251	1.1%	Rank history: #10 in FY2021, #11 in FY2022, #2 in FY2023 and #13 in FY2025; down 13 since FY2023.
16	Environmental Chemical Corporation 2 awardees, including ECC Environmental LLC Top agencies Army (Department of the Army) EPA (Environmental Protection Agency) USAF (Department of the Air Force)	$28,642,723	0.9%	Rank history: #13 in FY2021, #19 in FY2022, #14 in FY2023 and #20 in FY2025; down 2 since FY2023.
17	Eastern Research Group Inc. Top agencies EPA (Environmental Protection Agency) GSA (General Services Administration) DOI (Department of the Interior)	$25,207,414	0.8%	Rank history: #49 in FY2021, #42 in FY2022, #25 in FY2023 and #27 in FY2025; up 8 since FY2023.
18	Hgl-Er JV LLC Top agencies Army (Department of the Army)	$24,051,422	0.7%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
19	Tetra Tech, Inc. 14 awardees, including Ard, Inc. and Tetra TECH EC, Inc. Top agencies USAID (US Agency for International Development) USAF (Department of the Air Force) Army (Department of the Army)	$23,596,167	0.7%	Rank history: #15 in FY2021, #17 in FY2022, #19 in FY2023 and #18 in FY2025; unchanged since FY2023.
20	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)	$20,356,439	0.6%	Rank history: #27 in FY2021, #18 in FY2022, #24 in FY2023 and #14 in FY2025; up 4 since FY2023.
21	Pika International Inc. Top agencies Army (Department of the Army)	$18,963,499	0.6%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
22	Bay West LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$17,336,148	0.5%	Rank history: #47 in FY2021, #53 in FY2022, #21 in FY2023 and #19 in FY2025; down 1 since FY2023.
23	Environmental Rail Solutions Inc. Top agencies Army (Department of the Army)	$16,244,600	0.5%	Rank history: not on the FY2021 list, #47 in FY2022, #31 in FY2023 and #32 in FY2025; up 8 since FY2023.
24	Brice Engineering, LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$16,096,275	0.5%	Rank history: #76 in FY2021, #31 in FY2022, #10 in FY2023 and #25 in FY2025; down 14 since FY2023.
25	Cape-Weston JV1 LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$14,231,711	0.4%	Rank history: not on the FY2021–FY2023 lists and #78 in FY2025; up 110 since FY2023.
26	Olgoonik Corporation Through FPM Remediations, Inc. Top agencies Army (Department of the Army) USAF (Department of the Air Force) DHS (Department of Homeland Security)	$14,077,411	0.4%	Rank history: not on the FY2021–FY2022 lists, #71 in FY2023 and #23 in FY2025; up 45 since FY2023.
27	Skeo Solutions, Inc. Top agencies EPA (Environmental Protection Agency)	$14,074,259	0.4%	Rank history: #90 in FY2021, #22 in FY2022, #33 in FY2023 and #67 in FY2025; up 6 since FY2023.
28	Paragon Professional Services LLC Top agencies DOE (Department of Energy) Army (Department of the Army)	$13,688,923	0.4%	Rank history: #34 in FY2021, #35 in FY2022, #22 in FY2023 and #16 in FY2025; down 6 since FY2023.
29	Cape Environmental Management Inc. Top agencies Army (Department of the Army) USAF (Department of the Air Force) Navy (Department of the Navy)	$13,445,719	0.4%	Rank history: #11 in FY2021, #12 in FY2022, #36 in FY2023 and #30 in FY2025; up 7 since FY2023.
30	Seres-Arcadis SB JV, LLC Top agencies Army (Department of the Army)	$13,382,853	0.4%	Rank history: #70 in FY2021, #60 in FY2022, #74 in FY2023 and #60 in FY2025; up 44 since FY2023.
31	JFL-WCS Partners LLC Through Waste Control Specialists LLC Top agencies DOE (Department of Energy) EPA (Environmental Protection Agency)	$13,095,027	0.4%	Rank history: not on the FY2021–FY2022 lists, #59 in FY2023 and #49 in FY2025; up 28 since FY2023.
32	Environmental Restoration LLC Top agencies EPA (Environmental Protection Agency)	$12,509,620	0.4%	Rank history: #23 in FY2021, #6 in FY2022, #12 in FY2023 and #24 in FY2025; down 20 since FY2023.
33	Fpm-Aecom JV1 2 awardees, including Fpm-Aecom JV2 Top agencies USAF (Department of the Air Force) Army (Department of the Army) DOE (Department of Energy)	$12,018,585	0.4%	Rank history: not on the FY2021–FY2022 lists, #16 in FY2023 and #81 in FY2025; down 17 since FY2023.
34	SOL Solutions LLC Top agencies Army (Department of the Army) Navy (Department of the Navy)	$11,887,697	0.4%	Rank history: not on the FY2021–FY2023 lists and #62 in FY2025; new.
35	Charter Contracting Company, LLC Top agencies Army (Department of the Army)	$11,594,969	0.4%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
36	The Solution Foundry, LLC Top agencies USAF (Department of the Air Force) Army (Department of the Army)	$11,538,131	0.4%	Rank history: #40 in FY2021, #36 in FY2022, #40 in FY2023 and #28 in FY2025; up 4 since FY2023.
37	Talces JV, LLC Top agencies USAF (Department of the Air Force)	$9,883,360	0.3%	Rank history: not on the FY2021–FY2022 lists, #54 in FY2023 and not on the FY2025 list; up 17 since FY2023.
38	Parsons Corporation Through Parsons Government Services Inc. Top agencies OSD (Office of the Secretary of Defense) Army (Department of the Army) USAF (Department of the Air Force)	$9,648,242	0.3%	Rank history: not on the FY2021 list, #14 in FY2022, #55 in FY2023 and #29 in FY2025; up 17 since FY2023.
39	Aerostar Environmental and Construction LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force) Navy (Department of the Navy)	$9,576,010	0.3%	Rank history: not on the FY2021 list, #63 in FY2022, #57 in FY2023 and #43 in FY2025; up 18 since FY2023.
40	SES Civil and Environmental LLC Top agencies USAF (Department of the Air Force) Navy (Department of the Navy) Army (Department of the Army)	$9,312,446	0.3%	Rank history: not on the FY2021–FY2023 lists and #35 in FY2025; new.
41	Terra Solutions & Services Inc. Top agencies Army (Department of the Army)	$9,295,223	0.3%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
42	General Dynamics Corporation Through General Dynamics Information Technology, Inc. Top agencies EPA (Environmental Protection Agency)	$9,103,016	0.3%	Rank history: #37 in FY2021, not on the FY2022 list, #63 in FY2023 and not on the FY2025 list; up 21 since FY2023.
43	Semanticbits LLC Through ICF Incorporated, L.L.C. Top agencies EPA (Environmental Protection Agency) USDA (Department of Agriculture) Commerce (Department of Commerce)	$8,414,554	0.3%	Rank history: not on the FY2021–FY2023 lists and #66 in FY2025; new.
44	Fpm-Aecom JV2 Top agencies Army (Department of the Army)	$7,790,503	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
45	Global Science & Technology, LLC Top agencies Commerce (Department of Commerce)	$7,657,486	0.2%	Rank history: not on the FY2021 list, #61 in FY2022, #56 in FY2023 and #42 in FY2025; up 11 since FY2023.
46	US Ecology, Inc. Through US Ecology Holdings, Inc. Top agencies Army (Department of the Army)	$7,390,983	0.2%	Rank history: not on the FY2021 list, #20 in FY2022, #38 in FY2023 and not on the FY2025 list; down 8 since FY2023.
47	Republic Services Inc. 3 awardees, including Environmental, Safety & Health Consulting Services, Inc. Top agencies Army (Department of the Army) Navy (Department of the Navy)	$7,300,245	0.2%	Rank history: not on the FY2021–FY2023 lists and #56 in FY2025; new.
48	Bb&E, Inc. Top agencies NASA (National Aeronautics and Space Administration) USAF (Department of the Air Force)	$7,260,140	0.2%	Rank history: #48 in FY2021, #55 in FY2022, #60 in FY2023 and #38 in FY2025; up 12 since FY2023.
49	Cape Remediation, LLC Top agencies EPA (Environmental Protection Agency)	$7,254,610	0.2%	Rank history: not on the FY2021–FY2022 lists, #15 in FY2023 and #48 in FY2025; down 34 since FY2023.
50	Ch2M Hill, Inc. Top agencies EPA (Environmental Protection Agency) USAF (Department of the Air Force)	$7,180,000	0.2%	Rank history: not on the FY2021 list, #83 in FY2022, not on the FY2023 list and #94 in FY2025; up 446 since FY2023.
51	Ayuda Arcadis 8A Joint Venture LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$7,174,175	0.2%	Rank history: #33 in FY2021, #73 in FY2022, #82 in FY2023 and #79 in FY2025; up 31 since FY2023.
52	Link Technologies Inc. Top agencies DOE (Department of Energy)	$7,168,026	0.2%	Rank history: #60 in FY2021, #62 in FY2022, #62 in FY2023 and #50 in FY2025; up 10 since FY2023.
53	Ahtna-Arcadis 8(A) JV, LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$6,629,928	0.2%	Rank history: not on the FY2021–FY2022 lists, #30 in FY2023 and #77 in FY2025; down 23 since FY2023.
54	Northwind-Jacobs Joint Venture Top agencies Army (Department of the Army)	$6,619,568	0.2%	Rank history: not on the FY2021 list, #80 in FY2022, #17 in FY2023 and not on the FY2025 list; down 37 since FY2023.
55	Brice Solutions, LLC Top agencies DHS (Department of Homeland Security) Army (Department of the Army)	$6,615,822	0.2%	Rank history: not on the FY2021–FY2023 lists and #86 in FY2025; up 285 since FY2023.
56	Industrial Economics Inc. Top agencies DOE (Department of Energy) Commerce (Department of Commerce) EPA (Environmental Protection Agency)	$6,260,500	0.2%	Rank history: #95 in FY2021, #66 in FY2022, #51 in FY2023 and #74 in FY2025; down 5 since FY2023.
57	Oneida Environmental, LLC Top agencies OSD (Office of the Secretary of Defense) USAF (Department of the Air Force) Navy (Department of the Navy)	$6,253,153	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
58	Ea-Bay West Joint Venture LLC Top agencies Army (Department of the Army)	$6,216,755	0.2%	Rank history: not on the FY2021–FY2022 lists, #83 in FY2023 and not on the FY2025 list; up 25 since FY2023.
59	LDS Kemron JV LLC Top agencies Army (Department of the Army)	$6,193,517	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
60	Hana Engineers & Consultants LLC Top agencies Army (Department of the Army) EPA (Environmental Protection Agency)	$5,970,635	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; up 220 since FY2023.
61	Joyce Coffee Consulting LLC Top agencies EPA (Environmental Protection Agency)	$5,859,744	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; up 247 since FY2023.
62	Limited Liability Corporation Tanaq-Mmg 8(A) Joint Venture Top agencies USAF (Department of the Air Force) Army (Department of the Army)	$5,670,632	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
63	Asgn Incorporated Through ECS Federal, LLC Top agencies Commerce (Department of Commerce)	$5,650,053	0.2%	Rank history: not on the FY2021–FY2023 lists and #51 in FY2025; new.
64	Vernadero Group Inc. Top agencies Navy (Department of the Navy) Army (Department of the Army) USAF (Department of the Air Force)	$5,641,559	0.2%	Rank history: #66 in FY2021, not on the FY2022 list, #64 in FY2023 and not on the FY2025 list; unchanged since FY2023.
65	Confederated Salish and Kootenai Tribes 3 awardees, including S&K Mission Support, LLC Top agencies DOE (Department of Energy)	$5,484,317	0.2%	Rank history: #59 in FY2021, #81 in FY2022, #35 in FY2023 and not on the FY2025 list; down 30 since FY2023.
66	Aptim Federal Services LLC Top agencies Navy (Department of the Navy) EPA (Environmental Protection Agency) USAF (Department of the Air Force)	$5,463,227	0.2%	Rank history: #24 in FY2021, #21 in FY2022, #5 in FY2023 and not on the FY2025 list; down 61 since FY2023.
67	PCI Bhate JV LLC Top agencies USAF (Department of the Air Force) Army (Department of the Army)	$5,399,568	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; up 62 since FY2023.
68	S&K Mission Support, LLC Top agencies DOE (Department of Energy)	$5,339,695	0.2%	Rank history: not on the FY2021–FY2023 lists and #31 in FY2025; new.
69	Seres-Arcadis 8(A) JV2 LLC Top agencies Army (Department of the Army)	$5,258,614	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
70	Research Planning, Inc. Top agencies Commerce (Department of Commerce) DOT (Department of Transportation)	$5,162,820	0.2%	Rank history: not on the FY2021–FY2023 lists and #73 in FY2025; up 55 since FY2023.
71	Potomac-Hudson Engineering Inc Top agencies DOE (Department of Energy) Treasury (Department of the Treasury)	$4,927,563	0.2%	Rank history: not on the FY2021–FY2023 lists and #71 in FY2025; new.
72	Weston - Er Federal Services, LLC Top agencies Army (Department of the Army)	$4,864,678	0.2%	Rank history: #7 in FY2021, #16 in FY2022, not on the FY2023 list and not on the FY2025 list; returned.
73	Srs-Cape JV, LLC Top agencies Army (Department of the Army)	$4,810,810	0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
74	Tekpro Support Services, LLC Top agencies DOE (Department of Energy) USAF (Department of the Air Force)	$4,678,091	0.1%	Rank history: #78 in FY2021, #79 in FY2022, #79 in FY2023 and #63 in FY2025; up 5 since FY2023.
75	Battelle Memorial Institute Top agencies HHS (Department of Health and Human Services) EPA (Environmental Protection Agency) Navy (Department of the Navy)	$4,676,378	0.1%	Rank history: #29 in FY2021, not on the FY2022–FY2023 lists and #47 in FY2025; up 78 since FY2023.
76	Bhate Zapata, LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$4,666,852	0.1%	Rank history: #18 in FY2021, #68 in FY2022, #37 in FY2023 and not on the FY2025 list; down 39 since FY2023.
77	Azura Consulting LLC Top agencies Commerce (Department of Commerce)	$4,613,433	0.1%	Rank history: not on the FY2021 list, #88 in FY2022, #73 in FY2023 and #87 in FY2025; down 4 since FY2023.
78	Native Hawaiian Community Development Corporation Through GSI North America Inc. Top agencies USAF (Department of the Air Force) EPA (Environmental Protection Agency) Army (Department of the Army)	$4,527,941	0.1%	Rank history: not on the FY2021 list, #54 in FY2022, #29 in FY2023 and not on the FY2025 list; down 49 since FY2023.
79	Sustainment & Restoration Services, LLC Top agencies USAF (Department of the Air Force) Navy (Department of the Navy) HHS (Department of Health and Human Services)	$4,402,944	0.1%	Rank history: not on the FY2021–FY2023 lists and #15 in FY2025; new.
80	Aleut Technical Services, LLC Top agencies EPA (Environmental Protection Agency)	$4,371,915	0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; up 29 since FY2023.
81	Bluestone Environmental Group, Inc. Top agencies Army (Department of the Army) USDA (Department of Agriculture) DOT (Department of Transportation)	$4,355,984	0.1%	Rank history: not on the FY2021–FY2023 lists and #54 in FY2025; up 40 since FY2023.
82	Whitetail Environmental, LLC Top agencies Army (Department of the Army)	$4,354,652	0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; up 24 since FY2023.
83	Ahtna Solutions, LLC Top agencies USAF (Department of the Air Force) Commerce (Department of Commerce) Army (Department of the Army)	$4,348,568	0.1%	Rank history: not on the FY2021 list, #48 in FY2022, not on the FY2023 list and not on the FY2025 list; up 54 since FY2023.
84	Umyuaq Consulting Group, LLC Top agencies Army (Department of the Army)	$4,302,879	0.1%	Rank history: #75 in FY2021, #44 in FY2022, #75 in FY2023 and not on the FY2025 list; down 9 since FY2023.
85	CDM A Joint Venture Top agencies DOE (Department of Energy)	$4,256,233	0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; up 18 since FY2023.
86	Bluestone Interspec JV, LLC Top agencies Navy (Department of the Navy)	$4,215,817	0.1%	Rank history: not on the FY2021–FY2022 lists, #95 in FY2023 and #55 in FY2025; up 9 since FY2023.
87	Bhate Environmental Associates, Inc. Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$4,177,263	0.1%	Rank history: #57 in FY2021, #52 in FY2022, #68 in FY2023 and #68 in FY2025; down 19 since FY2023.
88	Tierra Data Inc. Top agencies Navy (Department of the Navy)	$4,101,284	0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
89	R & K Enterprise Solutions, Inc. Top agencies DHS (Department of Homeland Security)	$4,084,252	0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
90	Tetra TECH EC, Inc. Top agencies DOE (Department of Energy)	$4,000,000	0.1%	Rank history: not on the FY2021–FY2023 lists and #61 in FY2025; new.
91	Whitetail Ayuda Joint Venture LLC Top agencies USAF (Department of the Air Force) Army (Department of the Army)	$3,895,278	0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
92	Koman Government Solutions LLC Top agencies Army (Department of the Army) Navy (Department of the Navy)	$3,865,228	0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
93	Hikina 2 Komohana Consulting Inc. Top agencies Army (Department of the Army)	$3,842,571	0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; up 223 since FY2023.
94	Ciri Development Corporation 2 awardees, including North Wind Resource Consulting LLC Top agencies Army (Department of the Army) USDA (Department of Agriculture)	$3,813,332	0.1%	Rank history: not on the FY2021 list, #5 in FY2022, #78 in FY2023 and not on the FY2025 list; down 16 since FY2023.
95	Environmental Incentives, Inc. Top agencies USAID (US Agency for International Development)	$3,757,028	0.1%	Rank history: not on the FY2021–FY2023 lists and #82 in FY2025; new.
96	Ayuda-Plexus Joint Venture LLC Top agencies Army (Department of the Army)	$3,687,288	0.1%	Rank history: #41 in FY2021, #78 in FY2022, not on the FY2023 list and not on the FY2025 list; up 37 since FY2023.
97	Environmental Research Group LLC Top agencies Army (Department of the Army) Navy (Department of the Navy) DHS (Department of Homeland Security)	$3,682,088	0.1%	Rank history: not on the FY2021–FY2022 lists, #76 in FY2023 and not on the FY2025 list; down 21 since FY2023.
98	Spackman Mossop Michaels, LLC Top agencies EPA (Environmental Protection Agency)	$3,622,870	0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
99	Bristol Bay Native Corporation 3 awardees, including Bristol Environmental Solutions LLC and Specpro Professional Services, LLC Top agencies Army (Department of the Army)	$3,529,997	0.1%	Rank history: not on the FY2021–FY2022 lists, #89 in FY2023 and not on the FY2025 list; down 10 since FY2023.
100	Solv LLC Top agencies DHS (Department of Homeland Security) DOE (Department of Energy) Commerce (Department of Commerce)	$3,529,508	0.1%	Rank history: not on the FY2021–FY2022 lists, #98 in FY2023 and not on the FY2025 list; down 2 since FY2023.

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100 of 747 contractors listed here. See the rest on GovTribe.

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 $3.23 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 F999 contractors in FY2024?

1. United Cleanup Oak Ridge LLC ($592M), 2. Jacobs Engineering Group Inc. ($397M), 3. HUI Huliau Technology Services LLC ($217M), 4. Sevenson Environmental Services, Inc. ($121M), 5. Hanford Laboratory Management and Integration LLC ($120M), 6. Idaho Environmental Coalition LLC ($99.8M), 7. Guidehouse Inc. ($80.8M), 8. BWX Technologies, Inc. ($74M), 9. Dawson Solutions LLC ($69.8M), 10. Hydrogeologic, Inc. ($69.2M).

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