Top 100 Contractors in NAICS 5629: Remediation and Other Waste Management Services, FY2025

Name: Top 100 Contractors in NAICS 5629: Remediation and Other Waste Management Services, FY2025
Creator: GovTribe
License: https://creativecommons.org/licenses/by/4.0/

Parent companies by net contract obligations Oct 1, 2024 – Sep 30, 2025 Code page on GovTribe

The top 10 won 61% of FY2025 NAICS 5629 contract dollars

Contract obligations: $6,924,022,554 Net of deobligations, by contracts coded NAICS 5629 or a code under it
Contractors: 1,646 Parent companies with an obligation
Largest contractor: Amentum Holdings, Inc. $1.64 billion, 22.4% of obligations
Data as of: Oct 23, 2026

Contract actions from FPDS (SAM.gov). How the rankings work · Download all 100 rows as CSV · Free to reuse with credit to GovTribe (CC BY 4.0)

Full ranking

Rank	Contractor	Net obligations	Share	Trend
1	Amentum Holdings, Inc. 8 awardees, including Central Plateau Cleanup Company, LLC, United Cleanup Oak Ridge LLC and Idaho Environmental Coalition LLC Top agencies DOE (Department of Energy) Army (Department of the Army) DOT (Department of Transportation)	$1,635,276,831	22.4%	Rank history: not on the FY2021–FY2023 lists and #29 in FY2024; up 28 since FY2024.
2	Savannah River Mission Completion, LLC Top agencies DOE (Department of Energy)	$1,062,510,600	14.5%	Rank history: not on the FY2021 list, #1 in FY2022, #1 in FY2023 and #1 in FY2024; down 1 since FY2024.
3	Fluor Corporation 2 awardees, including Fluor-Bwxt Portsmouth LLC Top agencies DOE (Department of Energy)	$427,163,019	5.8%	Rank history: #1 in FY2021, #3 in FY2022, #4 in FY2023 and #3 in FY2024; unchanged since FY2024.
4	Bering Straits Native Corporation 6 awardees, including Bering Straits Global Innovations, LLC, Paragon Professional Services LLC and Paragon Environmental Services, LLC Top agencies Army (Department of the Army) EPA (Environmental Protection Agency) DOE (Department of Energy)	$310,321,860	4.2%	Rank history: not on the FY2021–FY2024 lists; new.
5	Arctic Slope Regional Corporation 6 awardees, including Environmental Quality Management, Inc., RSI Entech, LLC and EQ & CH Remediation Top agencies EPA (Environmental Protection Agency) DOE (Department of Energy) USAF (Department of the Air Force)	$270,681,356	3.7%	Rank history: #24 in FY2021, #42 in FY2022, #16 in FY2023 and #53 in FY2024; up 48 since FY2024.
6	Sevenson Environmental Services, Inc. Top agencies EPA (Environmental Protection Agency) Army (Department of the Army) Navy (Department of the Navy)	$206,477,198	2.8%	Rank history: #14 in FY2021, #10 in FY2022, #13 in FY2023 and #5 in FY2024; down 1 since FY2024.
7	Hydrogeologic, Inc. Top agencies Army (Department of the Army) EPA (Environmental Protection Agency) Navy (Department of the Navy)	$136,735,233	1.9%	Rank history: #5 in FY2021, #7 in FY2022, #7 in FY2023 and #9 in FY2024; up 2 since FY2024.
8	Guidehouse Inc. 3 awardees, including Aptim Federal Services, LLC, Aptim-Amentum Alaska Decommissioning LLC and Aptim Hdr, LLC Top agencies DOE (Department of Energy) Army (Department of the Army) Navy (Department of the Navy)	$132,751,753	1.8%	Rank history: not on the FY2021–FY2023 lists and #17 in FY2024; up 9 since FY2024.
9	United Cleanup Oak Ridge LLC Top agencies DOE (Department of Energy)	$132,359,640	1.8%	Rank history: not on the FY2021–FY2022 lists, #2 in FY2023 and #2 in FY2024; down 7 since FY2024.
10	EA Engineering Science and Technology Inc. PBC Top agencies EPA (Environmental Protection Agency) Army (Department of the Army) Navy (Department of the Navy)	$118,595,769	1.6%	Rank history: #7 in FY2021, #5 in FY2022, #6 in FY2023 and #8 in FY2024; down 2 since FY2024.
11	Tetra Tech, Inc. 10 awardees, including Tetra TECH EC, Inc. Top agencies DOS (Department of State) Army (Department of the Army) DOE (Department of Energy)	$118,022,622	1.6%	Rank history: #12 in FY2021, #8 in FY2022, #8 in FY2023 and #19 in FY2024; up 8 since FY2024.
12	Environmental Restoration LLC Top agencies EPA (Environmental Protection Agency) Army (Department of the Army)	$115,575,776	1.6%	Rank history: #9 in FY2021, #6 in FY2022, #11 in FY2023 and #21 in FY2024; up 9 since FY2024.
13	Ciri Development Corporation 5 awardees, including North Wind Portage, Inc., North Wind Site Services, LLC and North Wind General Contractors LLC Top agencies DOE (Department of Energy) Army (Department of the Army) DOI (Department of the Interior)	$110,376,839	1.5%	Rank history: not on the FY2021–FY2022 lists, #58 in FY2023 and not on the FY2024 list; up 213 since FY2024.
14	Hanford Laboratory Management and Integration LLC Top agencies DOE (Department of Energy)	$110,020,720	1.5%	Rank history: #21 in FY2021, #13 in FY2022, #15 in FY2023 and #10 in FY2024; down 4 since FY2024.
15	Idaho Environmental Coalition LLC 2 awardees Top agencies DOE (Department of Energy)	$89,822,360	1.2%	Rank history: not on the FY2021–FY2023 lists and #15 in FY2024; unchanged since FY2024.
16	Energy Technology Alliance LLC Top agencies DOE (Department of Energy)	$86,714,314	1.2%	Rank history: not on the FY2021–FY2023 lists and #11 in FY2024; down 5 since FY2024.
17	Environmental Chemical Corporation 3 awardees, including ECC Environmental LLC and Enviro-Fix Solutions LLC Top agencies Army (Department of the Army) EPA (Environmental Protection Agency) USAF (Department of the Air Force)	$70,202,241	1.0%	Rank history: #20 in FY2021, #29 in FY2022, #27 in FY2023 and #24 in FY2024; up 7 since FY2024.
18	Navarro Research and Engineering, Inc. Top agencies DOE (Department of Energy) Army (Department of the Army)	$69,124,871	0.9%	Rank history: #10 in FY2021, #16 in FY2022, #21 in FY2023 and #20 in FY2024; up 2 since FY2024.
19	Bristol Bay Native Corporation 8 awardees, including Aerostar SES LLC, Bristol Environmental Solutions LLC and Aerostar Environmental and Construction LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force) Navy (Department of the Navy)	$65,415,602	0.9%	Rank history: not on the FY2021–FY2022 lists, #52 in FY2023 and #92 in FY2024; up 73 since FY2024.
20	AECOM 7 awardees, including AECOM Technical Services, Inc., URS Group, Inc. and AECOM Arcadis Pfas JV Top agencies EPA (Environmental Protection Agency) Army (Department of the Army) DLA (Defense Logistics Agency)	$63,730,187	0.9%	Rank history: #2 in FY2021, #4 in FY2022, #9 in FY2023 and #65 in FY2024; up 45 since FY2024.
21	Hgl-Aptim Technologies JV LLC Top agencies Army (Department of the Army) DLA (Defense Logistics Agency) Navy (Department of the Navy)	$47,322,880	0.6%	Rank history: not on the FY2021–FY2024 lists; up 227 since FY2024.
22	Oneida Environmental, LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$41,732,823	0.6%	Rank history: not on the FY2021–FY2024 lists; up 106 since FY2024.
23	Kituwah Services, LLC Top agencies Army (Department of the Army)	$41,609,613	0.6%	Rank history: not on the FY2021–FY2024 lists; new.
24	West Valley Cleanup Alliance, LLC Top agencies DOE (Department of Energy)	$40,643,286	0.6%	Rank history: not on the FY2021–FY2024 lists; new.
25	Calista Corp 6 awardees, including Brice Engineering, LLC, Brice Integrated LLC and Brice Solutions, LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force) DOT (Department of Transportation)	$38,841,030	0.5%	Rank history: #42 in FY2021, #47 in FY2022, #89 in FY2023 and #94 in FY2024; up 69 since FY2024.
26	Ch2M Hill, Inc. Top agencies EPA (Environmental Protection Agency) Army (Department of the Army)	$37,488,090	0.5%	Rank history: not on the FY2021 list, #27 in FY2022, not on the FY2023 list and #27 in FY2024; up 1 since FY2024.
27	Cape Environmental Management Inc. 2 awardees, including Cape Remediation, LLC Top agencies EPA (Environmental Protection Agency) USAF (Department of the Air Force) Army (Department of the Army)	$37,058,095	0.5%	Rank history: #11 in FY2021, #14 in FY2022, #38 in FY2023 and #46 in FY2024; up 19 since FY2024.
28	Kemron Environmental Services Inc. 3 awardees, including Kemron / Arrowhead JV, LLC Top agencies EPA (Environmental Protection Agency) Army (Department of the Army) Navy (Department of the Navy)	$31,535,642	0.4%	Rank history: not on the FY2021–FY2023 lists and #12 in FY2024; down 16 since FY2024.
29	Jacobs Engineering Group Inc. 6 awardees, including Jacobs Usae Joint Venture, Jacobs Government Services Company and Ch2M Hill Constructors, Inc. Top agencies EPA (Environmental Protection Agency) DECA (Defense Commissary Agency) Army (Department of the Army)	$30,561,843	0.4%	Rank history: not on the FY2021–FY2022 lists, #34 in FY2023 and #25 in FY2024; down 4 since FY2024.
30	Parsons Corporation Through Parsons Government Services Inc. Top agencies Army (Department of the Army) USAF (Department of the Air Force) MDA (DOD Missile Defense Agency)	$30,020,556	0.4%	Rank history: #51 in FY2021, #21 in FY2022, #46 in FY2023 and #59 in FY2024; up 29 since FY2024.
31	Sustainment & Restoration Services, LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force) Navy (Department of the Navy)	$28,051,390	0.4%	Rank history: not on the FY2021–FY2023 lists and #48 in FY2024; up 17 since FY2024.
32	Couvillion Group LLC Top agencies DHS (Department of Homeland Security)	$26,914,727	0.4%	Rank history: not on the FY2021 list, #38 in FY2022, #42 in FY2023 and #56 in FY2024; up 24 since FY2024.
33	Southern Ohio Cleanup Company LLC Top agencies DOE (Department of Energy)	$26,751,447	0.4%	Rank history: not on the FY2021–FY2024 lists; up 207 since FY2024.
34	Republic Services Inc. 11 awardees, including Environmental, Safety & Health Consulting Services, Inc., National Response Corporation and NRC East Environmental Services, Inc. Top agencies DHS (Department of Homeland Security) USAF (Department of the Air Force) DOI (Department of the Interior)	$26,635,038	0.4%	Rank history: not on the FY2021–FY2024 lists; up 250 since FY2024.
35	Conti Federal Services, LLC Top agencies EPA (Environmental Protection Agency)	$25,535,523	0.3%	Rank history: not on the FY2021–FY2023 lists and #45 in FY2024; up 10 since FY2024.
36	Hgl-Aptim JV LLC Top agencies Army (Department of the Army)	$25,522,568	0.3%	Rank history: #36 in FY2021, #31 in FY2022, #50 in FY2023 and #32 in FY2024; down 4 since FY2024.
37	Bay West LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force) GSA (General Services Administration)	$25,139,077	0.3%	Rank history: #69 in FY2021, #70 in FY2022, #48 in FY2023 and #55 in FY2024; up 18 since FY2024.
38	CDM Smith Inc. 2 awardees, including CDM Federal Programs Corporation Top agencies EPA (Environmental Protection Agency)	$24,773,969	0.3%	Rank history: #32 in FY2021, #19 in FY2022 and not on the FY2023–FY2024 lists; returned.
39	Ahtna Global LLC Top agencies Army (Department of the Army)	$22,679,903	0.3%	Rank history: not on the FY2021–FY2024 lists; up 122 since FY2024.
40	Olgoonik Corporation 2 awardees, including FPM Remediations, Inc. Top agencies USAF (Department of the Air Force) Army (Department of the Army)	$22,201,185	0.3%	Rank history: #34 in FY2021, #86 in FY2022, #57 in FY2023 and #51 in FY2024; up 11 since FY2024.
41	Gsia-Parsons JV LLC Top agencies Army (Department of the Army)	$22,190,054	0.3%	Rank history: not on the FY2021–FY2024 lists; new.
42	Ahtna-Brennan JV, LLC Top agencies EPA (Environmental Protection Agency)	$21,315,304	0.3%	Rank history: not on the FY2021–FY2024 lists; new.
43	USA Environmental, Inc. Top agencies Navy (Department of the Navy) Army (Department of the Army)	$20,594,509	0.3%	Rank history: #46 in FY2021, #52 in FY2022, #53 in FY2023 and #60 in FY2024; up 17 since FY2024.
44	Cape-Weston JV3 LLC Top agencies Navy (Department of the Navy)	$18,995,444	0.3%	Rank history: not on the FY2021–FY2022 lists, #62 in FY2023 and #33 in FY2024; down 11 since FY2024.
45	Leidos Holdings, Inc. Through Leidos, Inc. Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$18,801,843	0.3%	Rank history: #52 in FY2021, #55 in FY2022, #67 in FY2023 and #97 in FY2024; up 52 since FY2024.
46	Professional Project Services, Inc. 2 awardees, including Enterprise Technical Assistance Services Inc. Top agencies DOE (Department of Energy)	$18,155,797	0.2%	Rank history: #65 in FY2021, #63 in FY2022, not on the FY2023 list and #77 in FY2024; up 31 since FY2024.
47	Roselin Charitar Top agencies Army (Department of the Army)	$17,501,692	0.2%	Rank history: not on the FY2021–FY2024 lists; new.
48	Cherokee Nation Red Wing, L.L.C. Through Cherokee Strategic Solutions, L.L.C. Top agencies Army (Department of the Army) Navy (Department of the Navy)	$17,407,418	0.2%	Rank history: not on the FY2021–FY2023 lists and #87 in FY2024; up 39 since FY2024.
49	Arrowhead Contracting, LLC Top agencies EPA (Environmental Protection Agency)	$17,181,032	0.2%	Rank history: not on the FY2021–FY2022 lists, #41 in FY2023 and not on the FY2024 list; up 77 since FY2024.
50	Ahtna Target JV, LLC Top agencies NASA (National Aeronautics and Space Administration)	$15,129,755	0.2%	Rank history: not on the FY2021–FY2024 lists; new.
51	Dawson Solutions LLC Through Laukoa Environmental Solutions, Inc. Top agencies DHS (Department of Homeland Security) Army (Department of the Army) USDA (Department of Agriculture)	$14,588,370	0.2%	Rank history: not on the FY2021–FY2022 lists, #74 in FY2023 and #16 in FY2024; down 35 since FY2024.
52	Eastern Shawnee - Bay West JV, LLC Top agencies Army (Department of the Army)	$14,384,119	0.2%	Rank history: not on the FY2021–FY2024 lists; new.
53	Arcadis U.s., Inc. Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$14,155,859	0.2%	Rank history: not on the FY2021–FY2024 lists; up 324 since FY2024.
54	Koman Government Solutions LLC Top agencies Army (Department of the Army) Navy (Department of the Navy) USAF (Department of the Air Force)	$13,376,826	0.2%	Rank history: not on the FY2021–FY2023 lists and #67 in FY2024; up 13 since FY2024.
55	Fpm-Aecom JV1 2 awardees, including Fpm-Aecom JV2 Top agencies Army (Department of the Army) DOE (Department of Energy) USAF (Department of the Air Force)	$12,411,294	0.2%	Rank history: not on the FY2021 list, #61 in FY2022, #25 in FY2023 and #30 in FY2024; down 25 since FY2024.
56	Clean Harbors Inc. Through Clean Harbors Environmental Services Inc. Top agencies USAF (Department of the Air Force) DHS (Department of Homeland Security) VA (Department of Veterans Affairs)	$11,987,617	0.2%	Rank history: not on the FY2021–FY2024 lists; up 167 since FY2024.
57	Engineering/Remediation Resources Group Inc. 2 awardees Top agencies Navy (Department of the Navy) Army (Department of the Army) USDA (Department of Agriculture)	$11,807,000	0.2%	Rank history: not on the FY2021–FY2023 lists and #78 in FY2024; up 21 since FY2024.
58	Apex Companies, LLC Through The Source Group, Inc. Top agencies DLA (Defense Logistics Agency)	$11,370,499	0.2%	Rank history: not on the FY2021–FY2024 lists; new.
59	Noreas Environmental Services LLC Top agencies Army (Department of the Army)	$11,267,164	0.2%	Rank history: not on the FY2021–FY2022 lists, #86 in FY2023 and #75 in FY2024; up 16 since FY2024.
60	Oneida Total Integrated Enterprises LLC Top agencies USAF (Department of the Air Force) DLA (Defense Logistics Agency) Army (Department of the Army)	$11,196,721	0.2%	Rank history: not on the FY2021–FY2023 lists and #71 in FY2024; up 11 since FY2024.
61	S&K Mission Support, LLC Top agencies DOE (Department of Energy)	$10,660,401	0.1%	Rank history: not on the FY2021–FY2024 lists; up 63 since FY2024.
62	Amentum Technology, Inc. Top agencies Army (Department of the Army)	$10,503,670	0.1%	Rank history: not on the FY2021–FY2023 lists and #23 in FY2024; down 39 since FY2024.
63	Tehama Technical Services, LLC Top agencies Army (Department of the Army) DOI (Department of the Interior)	$10,411,464	0.1%	Rank history: not on the FY2021–FY2024 lists; up 302 since FY2024.
64	Ahtna-Arcadis 8(A) JV, LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$9,708,771	0.1%	Rank history: not on the FY2021–FY2022 lists, #68 in FY2023 and #50 in FY2024; down 14 since FY2024.
65	Catawba-Tea, LLC Top agencies DOE (Department of Energy)	$9,280,302	0.1%	Rank history: not on the FY2021–FY2022 lists, #61 in FY2023 and #70 in FY2024; up 5 since FY2024.
66	Ahtna Solutions, LLC Top agencies Army (Department of the Army) DOI (Department of the Interior) DOT (Department of Transportation)	$9,261,908	0.1%	Rank history: not on the FY2021 list, #65 in FY2022, #88 in FY2023 and #91 in FY2024; up 25 since FY2024.
67	PCI Bhate JV LLC Top agencies USAF (Department of the Air Force) DLA (Defense Logistics Agency) Army (Department of the Army)	$8,954,353	0.1%	Rank history: not on the FY2021–FY2024 lists; up 48 since FY2024.
68	Pika International Inc. 2 awardees, including Pika-Pirnie JV LLC Top agencies Army (Department of the Army)	$8,785,141	0.1%	Rank history: not on the FY2021–FY2023 lists and #39 in FY2024; down 29 since FY2024.
69	LDS Kemron JV 4 LLC Top agencies Army (Department of the Army)	$8,485,821	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
70	Leisnoi Diversified Services, LLC Top agencies EPA (Environmental Protection Agency)	$8,342,628	0.1%	Rank history: #59 in FY2021, #58 in FY2022, #84 in FY2023 and #57 in FY2024; down 13 since FY2024.
71	Aergc JV LLC Top agencies Army (Department of the Army)	$8,326,564	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
72	Eqms-Bem Jvii, LLC Top agencies USAF (Department of the Air Force)	$8,056,449	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
73	WSP USA Solutions Inc 2 awardees, including WSP USA Environment & Infrastructure Inc. Top agencies USAF (Department of the Air Force)	$8,022,530	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
74	A and M Engineering & Environmental Services, Inc. Top agencies EPA (Environmental Protection Agency)	$7,707,747	0.1%	Rank history: #75 in FY2021, #85 in FY2022, not on the FY2023 list and #88 in FY2024; up 14 since FY2024.
75	Lata-Cti Environmental Services LLC Top agencies USAF (Department of the Air Force)	$7,012,639	0.1%	Rank history: not on the FY2021 list, #94 in FY2022, not on the FY2023 list and #84 in FY2024; up 9 since FY2024.
76	Huntington Ingalls Industries, Inc. Through Newport News Nuclear Bwxt-Los Alamos LLC Top agencies DOE (Department of Energy)	$6,781,652	0.1%	Rank history: #91 in FY2021, #71 in FY2022, #82 in FY2023 and not on the FY2024 list; returned.
77	Nuclear Ship Support Services LLC Top agencies DOT (Department of Transportation)	$6,742,567	0.1%	Rank history: #18 in FY2021, #56 in FY2022 and not on the FY2023–FY2024 lists; up 29 since FY2024.
78	HUI Huliau Technology Services LLC Top agencies Army (Department of the Army)	$6,659,638	0.1%	Rank history: not on the FY2021–FY2023 lists and #7 in FY2024; down 71 since FY2024.
79	C M C, Inc. Top agencies EPA (Environmental Protection Agency)	$6,209,587	0.1%	Rank history: #56 in FY2021, #30 in FY2022, #28 in FY2023 and #38 in FY2024; down 41 since FY2024.
80	Fidelis-Bbd, LLC Top agencies EPA (Environmental Protection Agency)	$6,030,015	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
81	Osage Nation Energy Services LLC 2 awardees Top agencies Army (Department of the Army)	$5,890,330	0.1%	Rank history: not on the FY2021–FY2024 lists; up 102 since FY2024.
82	3D Envirologics LLC Top agencies HHS (Department of Health and Human Services) Navy (Department of the Navy)	$5,850,682	0.1%	Rank history: not on the FY2021–FY2022 lists, #96 in FY2023 and not on the FY2024 list; up 39 since FY2024.
83	Enhanced Environmental & Emergency Services Inc. 2 awardees, including E3 Omi, LLC Top agencies Navy (Department of the Navy) DHS (Department of Homeland Security) USAF (Department of the Air Force)	$5,797,340	0.1%	Rank history: not on the FY2021–FY2024 lists; up 68 since FY2024.
84	Amerivet Contracting Top agencies USDA (Department of Agriculture)	$5,614,720	0.1%	Rank history: not on the FY2021–FY2024 lists; up 18 since FY2024.
85	Ronjon Rentals Inc. Top agencies Army (Department of the Army) Navy (Department of the Navy)	$5,505,733	0.1%	Rank history: not on the FY2021–FY2024 lists; up 69 since FY2024.
86	Cape-Weston JV1 LLC Top agencies Army (Department of the Army)	$5,435,119	0.1%	Rank history: not on the FY2021–FY2023 lists and #63 in FY2024; down 23 since FY2024.
87	LPS Kemron JV LLC Top agencies EPA (Environmental Protection Agency)	$5,370,014	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
88	Bhate Environmental Associates, Inc. Top agencies USAF (Department of the Air Force) DLA (Defense Logistics Agency) Navy (Department of the Navy)	$5,361,522	0.1%	Rank history: #63 in FY2021, #50 in FY2022, #92 in FY2023 and not on the FY2024 list; up 17 since FY2024.
89	Oneida-Stantec JV LLC Top agencies Army (Department of the Army)	$5,168,223	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
90	Young Gun Construction LLC Top agencies USDA (Department of Agriculture)	$4,996,797	0.1%	Rank history: not on the FY2021–FY2024 lists; up 70 since FY2024.
91	Cedar International Services, LLC Top agencies Army (Department of the Army)	$4,981,785	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
92	Kgsne JV II LLC Top agencies EPA (Environmental Protection Agency)	$4,972,718	0.1%	Rank history: not on the FY2021–FY2024 lists; up 90 since FY2024.
93	GSI North America Inc. Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$4,706,148	0.1%	Rank history: not on the FY2021–FY2023 lists and #95 in FY2024; up 2 since FY2024.
94	Major Contracting Services, Inc. Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$4,584,750	0.1%	Rank history: not on the FY2021–FY2024 lists; up 42 since FY2024.
95	Gsina-Gilbane II JV LLC Top agencies USAF (Department of the Air Force)	$4,544,694	0.1%	Rank history: not on the FY2021–FY2023 lists and #98 in FY2024; up 3 since FY2024.
96	J.f. Brennan Company, Inc. Top agencies EPA (Environmental Protection Agency) Army (Department of the Army)	$4,515,459	0.1%	Rank history: not on the FY2021 list, #12 in FY2022, not on the FY2023 list and #42 in FY2024; down 54 since FY2024.
97	Verina Consulting Group LLC Top agencies Army (Department of the Army)	$4,498,340	0.1%	Rank history: not on the FY2021–FY2024 lists; up 112 since FY2024.
98	Broadbent & Associates, Inc. Top agencies DOI (Department of the Interior)	$4,467,532	0.1%	Rank history: not on the FY2021–FY2024 lists; up 39 since FY2024.
99	Applied Aquatic Management, Inc. Top agencies Army (Department of the Army)	$4,465,535	0.1%	Rank history: not on the FY2021 list, #66 in FY2022 and not on the FY2023–FY2024 lists; up 56 since FY2024.
100	State of California Department of Toxic Substances Control Top agencies NASA (National Aeronautics and Space Administration)	$4,409,669	0.1%	Rank history: not on the FY2021–FY2024 lists; new.

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100 of 1,646 contractors listed here. See the rest on GovTribe.

Rankings for the codes under NAICS 5629

Code	Net obligations	Largest contractor
56291 Remediation Services	$6,475,542,321	Amentum Holdings, Inc.
56299 All Other Waste Management Services	$442,227,513	Bering Straits Native Corporation

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 $7.31 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. An awardee whose own actions mostly name no parent, and that no other company's actions name as their parent, rolls up its SAM.gov registration's chain of parent companies: it counts under the first company there that other companies' actions name as their parent, or under the parent most of a company's own actions name, whichever comes first; with neither, under the highest company in the chain with federal contracts of its own. Joint ventures stay companies of their own. 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 2025 ran Oct 1, 2024 – Sep 30, 2025. 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 FY2024. "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 FY2024 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 NAICS 5629 contractors in FY2025?

1. Amentum Holdings, Inc. ($1.64B), 2. Savannah River Mission Completion, LLC ($1.06B), 3. Fluor Corporation ($427M), 4. Bering Straits Native Corporation ($310M), 5. Arctic Slope Regional Corporation ($271M), 6. Sevenson Environmental Services, Inc. ($206M), 7. Hydrogeologic, Inc. ($137M), 8. Guidehouse Inc. ($133M), 9. United Cleanup Oak Ridge LLC ($132M), 10. EA Engineering Science and Technology Inc. PBC ($119M).

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