Top 100 Contractors in PSC F108: Hazardous Substance Removal, Cleanup, and Disposal Services and Operational Support, FY2021

Name: Top 100 Contractors in PSC F108: Hazardous Substance Removal, Cleanup, and Disposal Services and Operational Support, FY2021
Creator: GovTribe

Parent companies by net contract obligations Oct 1, 2020 – Sep 30, 2021 Code page on GovTribe

The top 10 won 61% of FY2021 PSC F108 contract dollars

Contract obligations: $1,701,255,626 Net of deobligations, by contracts coded PSC F108
Contractors: 646 Parent companies with an obligation
Largest contractor: Bechtel Corp $655 million, 36.3% 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	Bechtel Corp 2 awardees, including Bechtel Parsons Blue Grass, A Joint Venture and Bechtel National, Inc. Top agencies Army (Department of the Army)	$655,463,231	36.3%	Rank history: #1 in FY2022, #1 in FY2023, #1 in FY2024 and #2 in FY2025; unchanged since FY2020.
2	Hydrogeologic, Inc. Top agencies Army (Department of the Army) EPA (Environmental Protection Agency)	$89,673,997	5.0%	Rank history: #4 in FY2022, #4 in FY2023, #5 in FY2024 and #9 in FY2025; up 1 since FY2020.
3	Environmental Restoration LLC Top agencies EPA (Environmental Protection Agency) DOJ (Department of Justice) USAF (Department of the Air Force)	$72,215,615	4.0%	Rank history: #3 in FY2022, #8 in FY2023, #11 in FY2024 and #5 in FY2025; up 1 since FY2020.
4	Bechtel National, Inc. Top agencies Army (Department of the Army)	$63,000,000	3.5%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
5	Cook Inlet Region Inc. 6 awardees, including North Wind Portage, Inc., North Wind Site Services, LLC and North Wind Construction Services, LLC Top agencies Army (Department of the Army) DOI (Department of the Interior) USAF (Department of the Air Force)	$62,849,288	3.5%	Rank history: #12 in FY2022, #9 in FY2023, #13 in FY2024 and not on the FY2025 list; up 146 since FY2020.
6	Jacobs Engineering Group Inc. 5 awardees, including Amentum Technology, Inc., Ch2M Hill, Inc. and Ch2M Hill Constructors, Inc. Top agencies Army (Department of the Army) EPA (Environmental Protection Agency)	$40,654,307	2.3%	Rank history: #15 in FY2022, #2 in FY2023, #14 in FY2024 and not on the FY2025 list; up 16 since FY2020.
7	EA Engineering, Science, and Technology, Inc., PBC 2 awardees Top agencies EPA (Environmental Protection Agency) USAF (Department of the Air Force) Army (Department of the Army)	$30,555,574	1.7%	Rank history: #2 in FY2022, #5 in FY2023, #4 in FY2024 and #8 in FY2025; up 2 since FY2020.
8	Aptim AECOM Decommissioning, LLC Top agencies Army (Department of the Army)	$28,844,304	1.6%	Rank history: not on the FY2022 list, #10 in FY2023 and not on the FY2024–FY2025 lists; down 3 since FY2020.
9	Arctic Slope Regional Corporation 2 awardees, including Environmental Quality Management, Inc. and EQM Services, LLC Top agencies EPA (Environmental Protection Agency) USAF (Department of the Air Force)	$27,293,116	1.5%	Rank history: #27 in FY2022, #6 in FY2023, #27 in FY2024 and #4 in FY2025; up 10 since FY2020.
10	Kemron Environmental Services, Inc. Top agencies EPA (Environmental Protection Agency) Army (Department of the Army) Navy (Department of the Navy)	$22,596,105	1.3%	Rank history: #13 in FY2022, #23 in FY2023 and not on the FY2024–FY2025 lists; up 8 since FY2020.
11	Bristol Environmental Solutions LLC Top agencies Army (Department of the Army)	$22,251,561	1.2%	Rank history: #76 in FY2022 and not on the FY2023–FY2025 lists; unchanged since FY2020.
12	Camp Dresser & Mckee Inc. Through CDM Federal Programs Corporation Top agencies EPA (Environmental Protection Agency)	$22,105,938	1.2%	Rank history: #16 in FY2022 and not on the FY2023–FY2025 lists; up 25 since FY2020.
13	Tetra Tech, Inc. 9 awardees, including Tetra TECH EC, Inc. Top agencies EPA (Environmental Protection Agency) Army (Department of the Army) USAF (Department of the Air Force)	$21,015,110	1.2%	Rank history: #14 in FY2022, #24 in FY2023, #12 in FY2024 and #13 in FY2025; down 7 since FY2020.
14	Oneida Nation 3 awardees, including Oneida Total Integrated Enterprises LLC and Sustainment & Restoration Services, LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force) DOI (Department of the Interior)	$18,967,099	1.1%	Rank history: #10 in FY2022, #13 in FY2023, #38 in FY2024 and not on the FY2025 list; up 9 since FY2020.
15	Ayuda MC2 JV LLC Top agencies EPA (Environmental Protection Agency)	$17,894,268	1.0%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
16	Itsi Gilbane Japan G.K. 2 awardees, including Gilbane Federal and Ges-Aecom JV Top agencies Navy (Department of the Navy) EPA (Environmental Protection Agency)	$17,150,099	0.9%	Rank history: #26 in FY2022 and not on the FY2023–FY2025 lists; up 14 since FY2020.
17	Cabrera Services Inc. Top agencies Army (Department of the Army) EPA (Environmental Protection Agency)	$15,825,048	0.9%	Rank history: #8 in FY2022, #57 in FY2023 and not on the FY2024–FY2025 lists; down 4 since FY2020.
18	Sevenson-Usa Environmental Joint Venture Top agencies Army (Department of the Army)	$14,602,334	0.8%	Rank history: #43 in FY2022, #56 in FY2023 and not on the FY2024–FY2025 lists; up 109 since FY2020.
19	Guardian Environmental Services Co Inc. Top agencies EPA (Environmental Protection Agency)	$12,885,110	0.7%	Rank history: not on the FY2022–FY2025 lists; up 44 since FY2020.
20	Parsons Corporation Through Parsons Government Services Inc. Top agencies Army (Department of the Army)	$12,286,000	0.7%	Rank history: #30 in FY2022, #34 in FY2023, #61 in FY2024 and #29 in FY2025; up 9 since FY2020.
21	Brice Engineering, LLC Top agencies Army (Department of the Army)	$11,923,140	0.7%	Rank history: #20 in FY2022, #15 in FY2023, #59 in FY2024 and #28 in FY2025; up 15 since FY2020.
22	EQ & CH Remediation Top agencies EPA (Environmental Protection Agency)	$11,277,327	0.6%	Rank history: not on the FY2022 list, #31 in FY2023, #15 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
23	C M C, Inc. Top agencies EPA (Environmental Protection Agency)	$10,755,863	0.6%	Rank history: #11 in FY2022, #12 in FY2023, #18 in FY2024 and #52 in FY2025; down 11 since FY2020.
24	Brice-Aecom JV1 Top agencies Army (Department of the Army)	$10,241,694	0.6%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
25	Leisnoi-Kemron 8A JV, LLC Top agencies Navy (Department of the Navy)	$9,769,041	0.5%	Rank history: not on the FY2022 list, #96 in FY2023, #64 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
26	Ahtna, Incorporated 3 awardees, including Ahtna Global LLC, Ahtna Environmental, Inc. and Ahtna Design-Build Inc. Top agencies Army (Department of the Army) DOE (Department of Energy)	$9,659,010	0.5%	Rank history: #73 in FY2022, #41 in FY2023 and not on the FY2024–FY2025 lists; down 11 since FY2020.
27	Aptim Federal Services LLC Top agencies Navy (Department of the Navy) Army (Department of the Army)	$9,608,402	0.5%	Rank history: #9 in FY2022, #17 in FY2023 and not on the FY2024–FY2025 lists; down 10 since FY2020.
28	Energysolutions LLC 2 awardees, including Energysolutions Services, Inc. Top agencies Navy (Department of the Navy)	$9,506,386	0.5%	Rank history: #25 in FY2022, #33 in FY2023 and not on the FY2024–FY2025 lists; down 12 since FY2020.
29	Leidos Holdings, Inc. Through Leidos, Inc. Top agencies DHS (Department of Homeland Security)	$9,391,473	0.5%	Rank history: #45 in FY2022, #29 in FY2023, #51 in FY2024 and #87 in FY2025; new, not ranked in FY2020.
30	Ie-Weston Federal Services JVB LLC Top agencies Army (Department of the Army)	$9,302,904	0.5%	Rank history: #39 in FY2022 and not on the FY2023–FY2025 lists; up 1 since FY2020.
31	Navarro Research and Engineering, Inc. Top agencies Army (Department of the Army) USAF (Department of the Air Force) DOE (Department of Energy)	$9,244,873	0.5%	Rank history: #29 in FY2022, #46 in FY2023, #34 in FY2024 and #42 in FY2025; down 21 since FY2020.
32	Hdr, Inc. 3 awardees, including HDR Aptim LLC Top agencies EPA (Environmental Protection Agency)	$9,182,662	0.5%	Rank history: #22 in FY2022, #27 in FY2023, #63 in FY2024 and #95 in FY2025; up 78 since FY2020.
33	AECOM 4 awardees, including AECOM Technical Services, Inc., Amentum Environment & Energy, Inc. and URS Group, Inc. Top agencies EPA (Environmental Protection Agency) DOT (Department of Transportation) Army (Department of the Army)	$8,517,350	0.5%	Rank history: #5 in FY2022, #3 in FY2023, #46 in FY2024 and not on the FY2025 list; down 13 since FY2020.
34	Amentum Services, Inc. Top agencies Army (Department of the Army)	$8,127,394	0.5%	Rank history: #6 in FY2022, #16 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
35	Kemron / Arrowhead JV, LLC Top agencies EPA (Environmental Protection Agency)	$7,988,834	0.4%	Rank history: #17 in FY2022, #14 in FY2023 and not on the FY2024–FY2025 lists; up 4 since FY2020.
36	A and M Engineering & Environmental Services, Inc. Top agencies EPA (Environmental Protection Agency)	$7,929,157	0.4%	Rank history: #33 in FY2022, not on the FY2023 list, #48 in FY2024 and #47 in FY2025; up 23 since FY2020.
37	Ea-Wood-2 MP JV Top agencies Army (Department of the Army)	$7,053,310	0.4%	Rank history: not on the FY2022–FY2025 lists; up 46 since FY2020.
38	Nobis Engineering, Inc. Top agencies EPA (Environmental Protection Agency)	$6,978,794	0.4%	Rank history: #24 in FY2022, #87 in FY2023, #30 in FY2024 and #93 in FY2025; up 2 since FY2020.
39	Susitna Environmental, LLC Top agencies Army (Department of the Army)	$5,866,830	0.3%	Rank history: not on the FY2022–FY2025 lists; up 353 since FY2020.
40	Olgoonik Corporation 2 awardees, including FPM Remediations, Inc. Top agencies Army (Department of the Army)	$5,645,254	0.3%	Rank history: not on the FY2022 list, #94 in FY2023 and not on the FY2024–FY2025 lists; up 57 since FY2020.
41	Salas O'brien Federal, LLC Top agencies Army (Department of the Army)	$5,508,732	0.3%	Rank history: #94 in FY2022 and not on the FY2023–FY2025 lists; up 30 since FY2020.
42	Bers-Weston Services Jvc, LLC Top agencies Navy (Department of the Navy)	$5,476,281	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
43	Environmental Compliance Consultants, Inc. Top agencies Army (Department of the Army) DOI (Department of the Interior) USAF (Department of the Air Force)	$5,457,997	0.3%	Rank history: #42 in FY2022, #48 in FY2023, #54 in FY2024 and #76 in FY2025; up 10 since FY2020.
44	Paragon-Jacobs Joint Venture, LLC Top agencies Army (Department of the Army)	$5,335,919	0.3%	Rank history: #34 in FY2022, #84 in FY2023, not on the FY2024 list and #77 in FY2025; unchanged since FY2020.
45	Battelle Memorial Institute Top agencies Navy (Department of the Navy)	$4,897,477	0.3%	Rank history: not on the FY2022–FY2025 lists; up 117 since FY2020.
46	Pika International, Inc. Top agencies Army (Department of the Army)	$4,854,952	0.3%	Rank history: #52 in FY2022 and not on the FY2023–FY2025 lists; up 15 since FY2020.
47	KGS Seres 8A JV LLC Top agencies Army (Department of the Army)	$4,717,200	0.3%	Rank history: #47 in FY2022, #62 in FY2023, #67 in FY2024 and #86 in FY2025; new, not ranked in FY2020.
48	Triumvirate Environmental, LLC Top agencies HHS (Department of Health and Human Services) Commerce (Department of Commerce) Army (Department of the Army)	$4,700,472	0.3%	Rank history: #55 in FY2022, #50 in FY2023, #53 in FY2024 and #51 in FY2025; down 3 since FY2020.
49	North Wind-Ea JV, LLC Top agencies Army (Department of the Army)	$4,331,986	0.2%	Rank history: not on the FY2022–FY2025 lists; up 105 since FY2020.
50	Cape Environmental Management Inc. 2 awardees Top agencies Navy (Department of the Navy)	$4,308,055	0.2%	Rank history: #23 in FY2022, not on the FY2023–FY2024 lists and #48 in FY2025; down 36 since FY2020.
51	Perma-Fix Environmental Services, Inc. Top agencies Navy (Department of the Navy)	$4,197,097	0.2%	Rank history: #87 in FY2022 and not on the FY2023–FY2025 lists; up 25 since FY2020.
52	Ahtna Infrastructure & Technologies LLC Top agencies Commerce (Department of Commerce)	$4,184,064	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
53	CTI and Associates, Inc. 2 awardees Top agencies DOE (Department of Energy)	$4,115,663	0.2%	Rank history: not on the FY2022–FY2025 lists; up 365 since FY2020.
54	OCH JV Top agencies EPA (Environmental Protection Agency) Navy (Department of the Navy)	$3,919,874	0.2%	Rank history: not on the FY2022–FY2023 lists, #26 in FY2024 and not on the FY2025 list; down 3 since FY2020.
55	Indus General Inc. Top agencies Navy (Department of the Navy)	$3,791,956	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
56	C & C Environmental Inc. Top agencies Army (Department of the Army)	$3,758,797	0.2%	Rank history: #61 in FY2022, #74 in FY2023, #87 in FY2024 and #63 in FY2025; up 1 since FY2020.
57	Bethel Environmental Solutions LLC Top agencies Army (Department of the Army)	$3,599,505	0.2%	Rank history: #41 in FY2022 and not on the FY2023–FY2025 lists; up 54 since FY2020.
58	Weston Solutions Holdings, Inc. 2 awardees, including Weston Solutions Inc. Top agencies Army (Department of the Army)	$3,464,834	0.2%	Rank history: #31 in FY2022, #43 in FY2023, #21 in FY2024 and #38 in FY2025; down 51 since FY2020.
59	Walter Thomas & Associates, Incorporated Top agencies VA (Department of Veterans Affairs)	$3,318,639	0.2%	Rank history: not on the FY2022–FY2025 lists; up 202 since FY2020.
60	Mabbett & Associates, Inc. Top agencies VA (Department of Veterans Affairs) Army (Department of the Army)	$3,031,109	0.2%	Rank history: not on the FY2022–FY2024 lists and #82 in FY2025; up 79 since FY2020.
61	Insight-Esi LLC Top agencies Navy (Department of the Navy)	$2,984,043	0.2%	Rank history: not on the FY2022–FY2024 lists and #96 in FY2025; up 163 since FY2020.
62	Earth Resources Technology, LLC Top agencies Army (Department of the Army) DOI (Department of the Interior)	$2,942,138	0.2%	Rank history: not on the FY2022–FY2025 lists; up 93 since FY2020.
63	Techlaw, Inc. 2 awardees, including Techlaw Consultants Inc. Top agencies EPA (Environmental Protection Agency)	$2,940,764	0.2%	Rank history: #67 in FY2022, #76 in FY2023 and not on the FY2024–FY2025 lists; up 85 since FY2020.
64	Natives of Kodiak, Incorporated 2 awardees, including Koman Government Solutions LLC and Environmental Assessment Services, LLC Top agencies Navy (Department of the Navy) Army (Department of the Army)	$2,911,470	0.2%	Rank history: #53 in FY2022, #54 in FY2023 and not on the FY2024–FY2025 lists; down 18 since FY2020.
65	Veolia Water North America-West LLC Through Veolia Es Technical Solutions LLC Top agencies Army (Department of the Army) DOJ (Department of Justice) Treasury (Department of the Treasury)	$2,823,610	0.2%	Rank history: #89 in FY2022 and not on the FY2023–FY2025 lists; up 5 since FY2020.
66	Seaon Environmental LLC Top agencies Navy (Department of the Navy)	$2,807,088	0.2%	Rank history: #50 in FY2022 and not on the FY2023–FY2025 lists; up 47 since FY2020.
67	Bvspc - Envirocon JV Top agencies EPA (Environmental Protection Agency)	$2,803,281	0.2%	Rank history: not on the FY2022–FY2025 lists; down 42 since FY2020.
68	ST George Tanaq Corp 2 awardees, including Heliotech Top agencies EPA (Environmental Protection Agency)	$2,744,486	0.2%	Rank history: #40 in FY2022, #38 in FY2023 and not on the FY2024–FY2025 lists; down 47 since FY2020.
69	Ch2M Hill, Inc. Top agencies EPA (Environmental Protection Agency)	$2,744,027	0.2%	Rank history: #19 in FY2022, #90 in FY2023, #31 in FY2024 and #36 in FY2025; new, not ranked in FY2020.
70	Day & Zimmermann Lone Star LLC Top agencies Army (Department of the Army)	$2,741,198	0.2%	Rank history: #57 in FY2022 and not on the FY2023–FY2025 lists; up 16 since FY2020.
71	Ahtna Engineering Services, LLC 2 awardees Top agencies Army (Department of the Army)	$2,723,198	0.2%	Rank history: not on the FY2022–FY2025 lists; down 21 since FY2020.
72	Hoolaulima Government Solutions, LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$2,661,933	0.1%	Rank history: not on the FY2022–FY2025 lists; down 30 since FY2020.
73	Engineering / Remediation Resources Group, Inc. 2 awardees Top agencies DOI (Department of the Interior) Navy (Department of the Navy) USAF (Department of the Air Force)	$2,590,862	0.1%	Rank history: #35 in FY2022, #97 in FY2023, #42 in FY2024 and #73 in FY2025; down 45 since FY2020.
74	Veterans Worldwide Sales & Services, LLC Top agencies EPA (Environmental Protection Agency)	$2,530,323	0.1%	Rank history: not on the FY2022–FY2025 lists; down 47 since FY2020.
75	Arcadis N.V. Through Arcadis U.s., Inc. Top agencies USAF (Department of the Air Force)	$2,462,906	0.1%	Rank history: not on the FY2022–FY2025 lists; down 43 since FY2020.
76	Seres-Arcadis SB JV, LLC Top agencies Army (Department of the Army)	$2,429,388	0.1%	Rank history: #98 in FY2022, #49 in FY2023 and not on the FY2024–FY2025 lists; up 13 since FY2020.
77	Seres-Arcadis 8(A) JV, LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$2,350,490	0.1%	Rank history: #93 in FY2022 and not on the FY2023–FY2025 lists; up 11 since FY2020.
78	Total Environmental Concepts, Inc. Top agencies HHS (Department of Health and Human Services)	$2,305,847	0.1%	Rank history: not on the FY2022–FY2025 lists; up 63 since FY2020.
79	Versar-Arcadis A Joint Venture Top agencies Army (Department of the Army)	$2,298,008	0.1%	Rank history: #36 in FY2022, #91 in FY2023 and not on the FY2024–FY2025 lists; down 31 since FY2020.
80	WDM + A & M Woman-Owned Small Business Joint Venture Top agencies EPA (Environmental Protection Agency)	$2,269,606	0.1%	Rank history: not on the FY2022–FY2025 lists; down 16 since FY2020.
81	CTL Environmental LLC Top agencies Army (Department of the Army)	$2,254,046	0.1%	Rank history: #97 in FY2022, #42 in FY2023 and not on the FY2024–FY2025 lists; down 16 since FY2020.
82	Specpro Sustainment and Environmental, LLC Top agencies Army (Department of the Army)	$2,198,160	0.1%	Rank history: #78 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
83	Clean Harbors Inc 3 awardees, including Clean Harbors Environmental Services Inc., Safety-Kleen Systems, Inc. and Clean Harbors Caribe, Inc. Top agencies Treasury (Department of the Treasury) Navy (Department of the Navy) VA (Department of Veterans Affairs)	$2,185,352	0.1%	Rank history: #56 in FY2022, #67 in FY2023 and not on the FY2024–FY2025 lists; up 42 since FY2020.
84	Bsx, LLC Top agencies USAF (Department of the Air Force) Navy (Department of the Navy) Army (Department of the Army)	$2,168,790	0.1%	Rank history: #72 in FY2022 and not on the FY2023–FY2025 lists; down 4 since FY2020.
85	US Ecology, Inc. 6 awardees, including US Ecology Washington Inc., NRC Environmental Services Inc. and National Response Corporation Top agencies Navy (Department of the Navy) DHS (Department of Homeland Security) DOI (Department of the Interior)	$2,083,668	0.1%	Rank history: not on the FY2022 list, #95 in FY2023 and not on the FY2024–FY2025 lists; down 51 since FY2020.
86	Environmental Chemical Corporation 2 awardees, including ECC Insight Philotechnics LLC Top agencies Navy (Department of the Navy) Army (Department of the Army)	$2,071,127	0.1%	Rank history: not on the FY2022 list, #45 in FY2023, #23 in FY2024 and #34 in FY2025; down 31 since FY2020.
87	B&V E&E JV Top agencies EPA (Environmental Protection Agency)	$2,038,209	0.1%	Rank history: #63 in FY2022 and not on the FY2023–FY2025 lists; up 42 since FY2020.
88	Sealaska Remediation Solutions, LLC Top agencies Navy (Department of the Navy) Army (Department of the Army)	$2,036,288	0.1%	Rank history: not on the FY2022–FY2025 lists; up 21 since FY2020.
89	RSI Services LLC Top agencies DOE (Department of Energy)	$2,000,000	0.1%	Rank history: #71 in FY2022, #89 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
90	Gannett Fleming Inc. Through Pars Gannett Fleming Joint Venture Top agencies Army (Department of the Army)	$1,986,356	0.1%	Rank history: not on the FY2022–FY2025 lists; down 41 since FY2020.
91	Del Mar Environmental & Construction Services Inc. Top agencies Navy (Department of the Navy)	$1,896,631	0.1%	Rank history: not on the FY2022–FY2025 lists; up 255 since FY2020.
92	LOS Alamos Technical Associates, Inc. Top agencies USAF (Department of the Air Force)	$1,886,868	0.1%	Rank history: not on the FY2022 list, #88 in FY2023 and not on the FY2024–FY2025 lists; down 40 since FY2020.
93	URS Group, Inc. Top agencies Army (Department of the Army)	$1,872,607	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
94	Waste Control Specialists LLC Top agencies Army (Department of the Army) EPA (Environmental Protection Agency)	$1,794,930	0.1%	Rank history: not on the FY2022–FY2025 lists; up 73 since FY2020.
95	Environmental Logistics, Inc. Top agencies VA (Department of Veterans Affairs) DOJ (Department of Justice)	$1,750,003	0.1%	Rank history: not on the FY2022–FY2025 lists; up 155 since FY2020.
96	Native Hawaiian Community Development Corporation Through GSI North America Inc. Top agencies Army (Department of the Army)	$1,747,322	0.1%	Rank history: #66 in FY2022 and not on the FY2023–FY2025 lists; down 42 since FY2020.
97	Renova-Sovereign Joint Venture Top agencies Navy (Department of the Navy) Army (Department of the Army)	$1,733,391	0.1%	Rank history: #96 in FY2022 and not on the FY2023–FY2025 lists; down 39 since FY2020.
98	Gsi-K JV LLC Top agencies Navy (Department of the Navy)	$1,708,275	0.1%	Rank history: not on the FY2022–FY2025 lists; down 19 since FY2020.
99	Up-Side Management Co Top agencies Army (Department of the Army)	$1,693,067	0.1%	Rank history: not on the FY2022–FY2025 lists; up 50 since FY2020.
100	Noreas, Inc. Top agencies Army (Department of the Army)	$1,663,094	0.1%	Rank history: not on the FY2022–FY2025 lists; up 75 since FY2020.

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100 of 646 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 $1.81 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 2021 ran Oct 1, 2020 – Sep 30, 2021. 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 FY2020. "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 FY2020 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 F108 contractors in FY2021?

1. Bechtel Corp ($655M), 2. Hydrogeologic, Inc. ($89.7M), 3. Environmental Restoration LLC ($72.2M), 4. Bechtel National, Inc. ($63M), 5. Cook Inlet Region Inc. ($62.8M), 6. Jacobs Engineering Group Inc. ($40.7M), 7. EA Engineering, Science, and Technology, Inc., PBC ($30.6M), 8. Aptim AECOM Decommissioning, LLC ($28.8M), 9. Arctic Slope Regional Corporation ($27.3M), 10. Kemron Environmental Services, Inc. ($22.6M).

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