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

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

The top 10 won 60% of FY2025 NAICS 5629 contract dollars

Contract obligations: $6,923,810,441 Net of deobligations, by contracts coded NAICS 5629 or a code under it
Contractors: 1,701 Parent companies with an obligation
Largest contractor: Amentum Holdings, Inc. $1.66 billion, 22.7% 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	Amentum Holdings, Inc. 9 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)	$1,662,028,278	22.7%	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	Arctic Slope Regional Corporation 3 awardees, including Environmental Quality Management, Inc. and RSI Entech, LLC Top agencies EPA (Environmental Protection Agency) DOE (Department of Energy) USAF (Department of the Air Force)	$269,352,633	3.7%	Rank history: #24 in FY2021, #42 in FY2022, #16 in FY2023 and #53 in FY2024; up 49 since FY2024.
5	Bering Straits Global Innovations, LLC Top agencies Army (Department of the Army)	$254,634,116	3.5%	Rank history: not on the FY2021–FY2024 lists; new.
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	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 6 since FY2024.
9	Guidehouse Inc. Through Aptim Federal Services, LLC Top agencies DOE (Department of Energy) Army (Department of the Army) Navy (Department of the Navy)	$128,435,653	1.8%	Rank history: not on the FY2021–FY2023 lists and #17 in FY2024; up 8 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	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 10 since FY2024.
12	Tetra Tech, Inc. 8 awardees, including Tetra TECH EC, Inc. Top agencies DOS (Department of State) Army (Department of the Army) Navy (Department of the Navy)	$112,391,748	1.5%	Rank history: #12 in FY2021, #8 in FY2022, #8 in FY2023 and #19 in FY2024; up 7 since FY2024.
13	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 3 since FY2024.
14	North Wind Portage, Inc. Top agencies DOE (Department of Energy) Army (Department of the Army)	$96,054,536	1.3%	Rank history: not on the FY2021 list, #23 in FY2022, #91 in FY2023 and #18 in FY2024; up 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	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 3 since FY2024.
18	AECOM Technical Services, Inc. Top agencies EPA (Environmental Protection Agency) Army (Department of the Army) DLA (Defense Logistics Agency)	$58,888,994	0.8%	Rank history: #67 in FY2021, not on the FY2022–FY2023 lists and #13 in FY2024; down 5 since FY2024.
19	Paragon Professional Services LLC 2 awardees Top agencies EPA (Environmental Protection Agency) Army (Department of the Army) DOE (Department of Energy)	$54,964,249	0.8%	Rank history: #47 in FY2021, #64 in FY2022, #33 in FY2023 and #31 in FY2024; up 12 since FY2024.
20	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 228 since FY2024.
21	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 107 since FY2024.
22	Kituwah Services, LLC Top agencies Army (Department of the Army)	$41,609,613	0.6%	Rank history: not on the FY2021–FY2024 lists; new.
23	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.
24	Environmental Chemical Corporation Top agencies Army (Department of the Army) USAF (Department of the Air Force) Navy (Department of the Navy)	$37,908,836	0.5%	Rank history: #20 in FY2021, #29 in FY2022, #27 in FY2023 and #24 in FY2024; unchanged since FY2024.
25	Bristol Bay Native Corporation 2 awardees, including Aerostar SES LLC and Bristol Environmental Solutions LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force) DLA (Defense Logistics Agency)	$37,907,504	0.5%	Rank history: not on the FY2021–FY2022 lists, #52 in FY2023 and #92 in FY2024; up 67 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	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 15 since FY2024.
28	Cape Environmental Management Inc. Top agencies USAF (Department of the Air Force) EPA (Environmental Protection Agency) Army (Department of the Army)	$30,574,889	0.4%	Rank history: #11 in FY2021, #14 in FY2022, #38 in FY2023 and #46 in FY2024; up 18 since FY2024.
29	Jacobs Government Services Company 6 awardees, including Jacobs Engineering Group Inc., Jacobs Usae Joint Venture 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	Brice Engineering, LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force) DOI (Department of the Interior)	$27,487,387	0.4%	Rank history: #39 in FY2021, #22 in FY2022, #18 in FY2023 and #43 in FY2024; up 11 since FY2024.
33	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 23 since FY2024.
34	Republic Services Inc. 8 awardees, including Environmental, Safety & Health Consulting Services, Inc., National Response Corporation and Republic Services of Pennsylvania, LLC Top agencies DHS (Department of Homeland Security) Treasury (Department of the Treasury) Navy (Department of the Navy)	$26,408,043	0.4%	Rank history: not on the FY2021–FY2024 lists; up 250 since FY2024.
35	CDM Federal Programs Corporation Top agencies EPA (Environmental Protection Agency)	$26,318,480	0.4%	Rank history: not on the FY2021–FY2022 lists, #100 in FY2023 and #37 in FY2024; up 2 since FY2024.
36	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 9 since FY2024.
37	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 5 since FY2024.
38	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 17 since FY2024.
39	Olgoonik Corporation Through FPM Remediations, Inc. Top agencies USAF (Department of the Air Force) Army (Department of the Army)	$23,086,157	0.3%	Rank history: #34 in FY2021, #86 in FY2022, #57 in FY2023 and #51 in FY2024; up 12 since FY2024.
40	Ahtna Global LLC Top agencies Army (Department of the Army)	$22,679,903	0.3%	Rank history: not on the FY2021–FY2024 lists; up 121 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	Roselin Charitar Top agencies Army (Department of the Army)	$17,501,692	0.2%	Rank history: not on the FY2021–FY2024 lists; new.
47	The Cherokee Nation 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 40 since FY2024.
48	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 78 since FY2024.
49	Aerostar Environmental and Construction LLC Top agencies Army (Department of the Army)	$16,876,852	0.2%	Rank history: not on the FY2021 list, #44 in FY2022, #71 in FY2023 and #40 in FY2024; down 9 since FY2024.
50	ECC Environmental LLC Top agencies EPA (Environmental Protection Agency) Army (Department of the Army)	$16,713,114	0.2%	Rank history: not on the FY2021–FY2023 lists and #54 in FY2024; up 4 since FY2024.
51	Enviro-Fix Solutions LLC Top agencies Army (Department of the Army)	$15,580,291	0.2%	Rank history: not on the FY2021–FY2022 lists, #76 in FY2023 and #64 in FY2024; up 13 since FY2024.
52	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.
53	Dawson Solutions LLC 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 37 since FY2024.
54	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.
55	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 322 since FY2024.
56	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 11 since FY2024.
57	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 27 since FY2024.
58	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 165 since FY2024.
59	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 19 since FY2024.
60	Enterprise Technical Assistance Services Inc. Top agencies DOE (Department of Energy)	$11,551,613	0.2%	Rank history: #38 in FY2021, #35 in FY2022, #36 in FY2023 and #36 in FY2024; down 24 since FY2024.
61	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 14 since FY2024.
62	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 9 since FY2024.
63	The Source Group, Inc. Top agencies DLA (Defense Logistics Agency)	$11,158,444	0.2%	Rank history: #17 in FY2021, #41 in FY2022, not on the FY2023 list and #90 in FY2024; up 27 since FY2024.
64	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 60 since FY2024.
65	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 42 since FY2024.
66	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 299 since FY2024.
67	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 17 since FY2024.
68	North Wind Site Services, LLC Top agencies DOE (Department of Energy) Army (Department of the Army) Navy (Department of the Navy)	$9,518,094	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
69	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 1 since FY2024.
70	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 21 since FY2024.
71	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 44 since FY2024.
72	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 33 since FY2024.
73	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.
74	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 17 since FY2024.
75	Aergc JV LLC Top agencies Army (Department of the Army)	$8,326,564	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
76	WSP USA Environment & Infrastructure Inc. Top agencies USAF (Department of the Air Force)	$8,275,534	0.1%	Rank history: not on the FY2021–FY2024 lists; up 32 since FY2024.
77	SES Civil and Environmental LLC Top agencies USAF (Department of the Air Force) Navy (Department of the Navy)	$8,152,382	0.1%	Rank history: not on the FY2021–FY2023 lists and #82 in FY2024; up 5 since FY2024.
78	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.
79	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 9 since FY2024.
80	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 4 since FY2024.
81	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.
82	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 24 since FY2024.
83	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 76 since FY2024.
84	Professional Project Services, Inc. Top agencies DOE (Department of Energy)	$6,604,184	0.1%	Rank history: #65 in FY2021, #63 in FY2022, not on the FY2023 list and #77 in FY2024; down 7 since FY2024.
85	Cape Remediation, LLC Top agencies EPA (Environmental Protection Agency)	$6,483,206	0.1%	Rank history: not on the FY2021–FY2022 lists, #35 in FY2023 and #76 in FY2024; down 9 since FY2024.
86	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 48 since FY2024.
87	Fidelis-Bbd, LLC Top agencies EPA (Environmental Protection Agency)	$6,030,015	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
88	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 95 since FY2024.
89	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 32 since FY2024.
90	Brice Integrated LLC Top agencies USAF (Department of the Air Force) Army (Department of the Army)	$5,625,126	0.1%	Rank history: not on the FY2021–FY2024 lists; up 55 since FY2024.
91	Amerivet Contracting Top agencies USDA (Department of Agriculture)	$5,614,720	0.1%	Rank history: not on the FY2021–FY2024 lists; up 11 since FY2024.
92	Ronjon Rentals Inc Top agencies Army (Department of the Army) Navy (Department of the Navy)	$5,505,674	0.1%	Rank history: not on the FY2021–FY2024 lists; up 62 since FY2024.
93	Tetra TECH EC, Inc. Top agencies DOE (Department of Energy)	$5,500,000	0.1%	Rank history: not on the FY2021–FY2024 lists; up 57 since FY2024.
94	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 31 since FY2024.
95	LPS Kemron JV LLC Top agencies EPA (Environmental Protection Agency)	$5,370,014	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
96	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 9 since FY2024.
97	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.
98	Enhanced Environmental & Emergency Services Inc. Top agencies Navy (Department of the Navy) DHS (Department of Homeland Security) Army (Department of the Army)	$5,011,996	0.1%	Rank history: not on the FY2021–FY2024 lists; up 53 since FY2024.
99	Young Gun Construction LLC Top agencies USDA (Department of Agriculture)	$4,996,797	0.1%	Rank history: not on the FY2021–FY2024 lists; up 61 since FY2024.
100	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.

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100 of 1,701 contractors listed here. See the rest on GovTribe.

Rankings for the codes under NAICS 5629

Code	Net obligations	Largest contractor
56291 Remediation Services	$6,475,330,266	Amentum Holdings, Inc.
56299 All Other Waste Management Services	$442,227,454	Bering Straits Global Innovations, 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 $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. 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. ($1.66B), 2. Savannah River Mission Completion, LLC ($1.06B), 3. Fluor Corporation ($427M), 4. Arctic Slope Regional Corporation ($269M), 5. Bering Straits Global Innovations, LLC ($255M), 6. Sevenson Environmental Services, Inc. ($206M), 7. Hydrogeologic, Inc. ($137M), 8. United Cleanup Oak Ridge LLC ($132M), 9. Guidehouse Inc. ($128M), 10. EA Engineering Science and Technology Inc. PBC ($119M).

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