Top 100 Contractors in NAICS 5629: Remediation and Other Waste Management Services, Aug 2025–Jul 2026

Full ranking

Rank	Contractor	Net obligations	Share	Trend
1	Amentum Holdings, Inc. 9 awardees, including Idaho Environmental Coalition LLC, United Cleanup Oak Ridge LLC and Central Plateau Cleanup Company, LLC Top agencies DOE (Department of Energy) Army (Department of the Army) DOT (Department of Transportation)	$2,019,659,842	29.3%	Rank history: not on the FY2021–FY2023 lists, #29 in FY2024 and #1 in FY2025; unchanged since Aug 2024–Jul 2025.
2	Savannah River Mission Completion, LLC Top agencies DOE (Department of Energy)	$914,414,089	13.3%	Rank history: not on the FY2021 list, #1 in FY2022, #1 in FY2023, #1 in FY2024 and #2 in FY2025; unchanged since Aug 2024–Jul 2025.
3	Southern Ohio Cleanup Company LLC Top agencies DOE (Department of Energy)	$143,819,066	2.1%	Rank history: not on the FY2021–FY2024 lists and #33 in FY2025; up 124 since Aug 2024–Jul 2025.
4	Environmental Restoration LLC Top agencies EPA (Environmental Protection Agency) Army (Department of the Army) DOJ (Department of Justice)	$141,783,982	2.1%	Rank history: #9 in FY2021, #6 in FY2022, #11 in FY2023, #21 in FY2024 and #12 in FY2025; up 17 since Aug 2024–Jul 2025.
5	Arctic Slope Regional Corporation 5 awardees, including RSI Entech, LLC, EQ & CH Remediation and EQM Services, LLC Top agencies DOE (Department of Energy) EPA (Environmental Protection Agency) DOI (Department of the Interior)	$131,645,900	1.9%	Rank history: #24 in FY2021, #42 in FY2022, #16 in FY2023, #53 in FY2024 and #5 in FY2025; new, not ranked in Aug 2024–Jul 2025.
6	West Valley Cleanup Alliance, LLC Top agencies DOE (Department of Energy)	$122,330,141	1.8%	Rank history: not on the FY2021–FY2024 lists and #24 in FY2025; up 101 since Aug 2024–Jul 2025.
7	Hydrogeologic, Inc. Top agencies EPA (Environmental Protection Agency) Army (Department of the Army) Navy (Department of the Navy)	$120,223,243	1.7%	Rank history: #5 in FY2021, #7 in FY2022, #7 in FY2023, #9 in FY2024 and #7 in FY2025; up 2 since Aug 2024–Jul 2025.
8	Tetra Tech, Inc. 11 awardees, including Tetra TECH EC, Inc. Top agencies DOS (Department of State) Army (Department of the Army) EPA (Environmental Protection Agency)	$113,700,412	1.7%	Rank history: #12 in FY2021, #8 in FY2022, #8 in FY2023, #19 in FY2024 and #11 in FY2025; up 8 since Aug 2024–Jul 2025.
9	Guidehouse Inc. 4 awardees, including Aptim Federal Services, LLC, Aptim Hdr, LLC and Aptim-Amentum Alaska Decommissioning LLC Top agencies DOE (Department of Energy) Army (Department of the Army) EPA (Environmental Protection Agency)	$113,663,167	1.7%	Rank history: not on the FY2021–FY2023 lists, #17 in FY2024 and #8 in FY2025; up 8 since Aug 2024–Jul 2025.
10	Hanford Laboratory Management and Integration LLC Top agencies DOE (Department of Energy)	$107,422,566	1.6%	Rank history: #21 in FY2021, #13 in FY2022, #15 in FY2023, #10 in FY2024 and #14 in FY2025; up 4 since Aug 2024–Jul 2025.
11	EA Engineering Science and Technology Inc. PBC Top agencies EPA (Environmental Protection Agency) Army (Department of the Army) USAF (Department of the Air Force)	$106,530,592	1.5%	Rank history: #7 in FY2021, #5 in FY2022, #6 in FY2023, #8 in FY2024 and #10 in FY2025; down 5 since Aug 2024–Jul 2025.
12	Environmental Chemical Corporation 3 awardees, including Enviro-Fix Solutions LLC and ECC Environmental LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force) EPA (Environmental Protection Agency)	$91,702,308	1.3%	Rank history: #20 in FY2021, #29 in FY2022, #27 in FY2023, #24 in FY2024 and #17 in FY2025; up 14 since Aug 2024–Jul 2025.
13	Kemron Environmental Services Inc. 3 awardees, including Kemron / Arrowhead JV, LLC Top agencies EPA (Environmental Protection Agency) Army (Department of the Army)	$89,687,007	1.3%	Rank history: not on the FY2021–FY2023 lists, #12 in FY2024 and #28 in FY2025; up 6 since Aug 2024–Jul 2025.
14	Ciri Development Corporation 4 awardees, including North Wind Portage, Inc., North Wind General Contractors LLC and North Wind Site Services, LLC Top agencies DOE (Department of Energy) Army (Department of the Army) DOI (Department of the Interior)	$86,379,104	1.3%	Rank history: not on the FY2021–FY2022 lists, #58 in FY2023, not on the FY2024 list and #13 in FY2025; new, not ranked in Aug 2024–Jul 2025.
15	Sevenson Environmental Services, Inc. Top agencies Army (Department of the Army) EPA (Environmental Protection Agency) Navy (Department of the Navy)	$81,204,383	1.2%	Rank history: #14 in FY2021, #10 in FY2022, #13 in FY2023, #5 in FY2024 and #6 in FY2025; down 12 since Aug 2024–Jul 2025.
16	Navarro Research and Engineering, Inc. Top agencies DOE (Department of Energy) Army (Department of the Army)	$78,867,311	1.1%	Rank history: #10 in FY2021, #16 in FY2022, #21 in FY2023, #20 in FY2024 and #18 in FY2025; up 2 since Aug 2024–Jul 2025.
17	Energy Technology Alliance LLC Top agencies DOE (Department of Energy)	$74,652,812	1.1%	Rank history: not on the FY2021–FY2023 lists, #11 in FY2024 and #16 in FY2025; down 4 since Aug 2024–Jul 2025.
18	Bristol Bay Native Corporation 8 awardees, including Bristol Environmental Solutions LLC, Aerostar SES LLC and SES Civil and Environmental LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force) Navy (Department of the Navy)	$64,198,993	0.9%	Rank history: not on the FY2021–FY2022 lists, #52 in FY2023, #92 in FY2024 and #19 in FY2025; up 77 since Aug 2024–Jul 2025.
19	Tehama Technical Services, LLC Top agencies EPA (Environmental Protection Agency) Army (Department of the Army) DOI (Department of the Interior)	$52,695,529	0.8%	Rank history: not on the FY2021–FY2024 lists and #63 in FY2025; up 83 since Aug 2024–Jul 2025.
20	Oneida Environmental, LLC Top agencies Army (Department of the Army)	$48,508,918	0.7%	Rank history: not on the FY2021–FY2024 lists and #22 in FY2025; up 89 since Aug 2024–Jul 2025.
21	Calista Corp 6 awardees, including Brice Engineering, LLC, Brice Environmental Services Corporation and Brice Integrated LLC Top agencies Army (Department of the Army) DOT (Department of Transportation) USAF (Department of the Air Force)	$46,978,395	0.7%	Rank history: #42 in FY2021, #47 in FY2022, #89 in FY2023, #94 in FY2024 and #25 in FY2025; up 75 since Aug 2024–Jul 2025.
22	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)	$39,258,956	0.6%	Rank history: #11 in FY2021, #14 in FY2022, #38 in FY2023, #46 in FY2024 and #27 in FY2025; up 20 since Aug 2024–Jul 2025.
23	Ch2M Hill, Inc. Top agencies EPA (Environmental Protection Agency) Army (Department of the Army)	$37,950,245	0.6%	Rank history: not on the FY2021 list, #27 in FY2022, not on the FY2023 list, #27 in FY2024 and #26 in FY2025; up 11 since Aug 2024–Jul 2025.
24	AECOM 6 awardees, including AECOM Technical Services, Inc., AECOM International Inc. and URS Group, Inc. Top agencies EPA (Environmental Protection Agency) Army (Department of the Army) DLA (Defense Logistics Agency)	$37,063,893	0.5%	Rank history: #2 in FY2021, #4 in FY2022, #9 in FY2023, #65 in FY2024 and #20 in FY2025; up 76 since Aug 2024–Jul 2025.
25	Weston Solutions Holdings Inc Through Weston Solutions Inc. Top agencies Army (Department of the Army)	$36,828,999	0.5%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Aug 2024–Jul 2025.
26	Fluor Corporation Through Fluor-Bwxt Portsmouth LLC Top agencies DOE (Department of Energy)	$35,914,034	0.5%	Rank history: #1 in FY2021, #3 in FY2022, #4 in FY2023, #3 in FY2024 and #3 in FY2025; down 22 since Aug 2024–Jul 2025.
27	Bering Straits Native Corporation 5 awardees, including Paragon Professional Services LLC and Paragon Environmental Services, LLC Top agencies EPA (Environmental Protection Agency) DOE (Department of Energy) Navy (Department of the Navy)	$34,691,928	0.5%	Rank history: not on the FY2021–FY2024 lists and #4 in FY2025; new, not ranked in Aug 2024–Jul 2025.
28	Eastern Shawnee - Bay West JV, LLC Top agencies Army (Department of the Army)	$34,283,868	0.5%	Rank history: not on the FY2021–FY2024 lists and #52 in FY2025; new, not ranked in Aug 2024–Jul 2025.
29	Kfs, LLC Top agencies Army (Department of the Army)	$30,465,847	0.4%	Rank history: #95 in FY2021 and not on the FY2022–FY2025 lists; up 191 since Aug 2024–Jul 2025.
30	USA Environmental, Inc. Top agencies Navy (Department of the Navy)	$28,420,008	0.4%	Rank history: #46 in FY2021, #52 in FY2022, #53 in FY2023, #60 in FY2024 and #43 in FY2025; up 29 since Aug 2024–Jul 2025.
31	CDM Smith Inc. Through CDM Federal Programs Corporation Top agencies EPA (Environmental Protection Agency) Army (Department of the Army)	$27,648,987	0.4%	Rank history: #32 in FY2021, #19 in FY2022, not on the FY2023–FY2024 lists and #38 in FY2025; new, not ranked in Aug 2024–Jul 2025.
32	Couvillion Group LLC Top agencies DHS (Department of Homeland Security)	$25,991,966	0.4%	Rank history: not on the FY2021 list, #38 in FY2022, #42 in FY2023, #56 in FY2024 and #32 in FY2025; up 4 since Aug 2024–Jul 2025.
33	Gsia-Parsons JV LLC Top agencies Army (Department of the Army)	$25,463,633	0.4%	Rank history: not on the FY2021–FY2024 lists and #41 in FY2025; new, not ranked in Aug 2024–Jul 2025.
34	Hgl-Aptim Technologies JV LLC Top agencies Army (Department of the Army) DLA (Defense Logistics Agency) Navy (Department of the Navy)	$24,047,132	0.3%	Rank history: not on the FY2021–FY2024 lists and #21 in FY2025; up 6 since Aug 2024–Jul 2025.
35	Jacobs Engineering Group Inc. 5 awardees, including Jacobs Usae Joint Venture, Jacobs Government Services Company and Ch2M Hill Constructors, Inc. Top agencies EPA (Environmental Protection Agency) Army (Department of the Army) DLA (Defense Logistics Agency)	$23,190,941	0.3%	Rank history: not on the FY2021–FY2022 lists, #34 in FY2023, #25 in FY2024 and #29 in FY2025; down 13 since Aug 2024–Jul 2025.
36	Hgl-Aptim JV LLC Top agencies Army (Department of the Army)	$22,801,730	0.3%	Rank history: #36 in FY2021, #31 in FY2022, #50 in FY2023, #32 in FY2024 and #36 in FY2025; up 5 since Aug 2024–Jul 2025.
37	Dawson Solutions LLC Through Laukoa Environmental Solutions, Inc. Top agencies DHS (Department of Homeland Security) Army (Department of the Army) DOJ (Department of Justice)	$22,098,984	0.3%	Rank history: not on the FY2021–FY2022 lists, #74 in FY2023, #16 in FY2024 and #51 in FY2025; up 7 since Aug 2024–Jul 2025.
38	Sustainment & Restoration Services, LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force) Navy (Department of the Navy)	$21,087,051	0.3%	Rank history: not on the FY2021–FY2023 lists, #48 in FY2024 and #31 in FY2025; up 10 since Aug 2024–Jul 2025.
39	Planned Systems International Inc. Through Advanced Technologies and Laboratories (Atl) International, Inc. Top agencies HHS (Department of Health and Human Services)	$20,600,093	0.3%	Rank history: not on the FY2021 list, #59 in FY2022, #80 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in Aug 2024–Jul 2025.
40	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)	$18,837,115	0.3%	Rank history: not on the FY2021–FY2023 lists, #87 in FY2024 and #48 in FY2025; up 23 since Aug 2024–Jul 2025.
41	Beautiful Environmental Construction Co., Ltd. Top agencies DOS (Department of State)	$18,509,384	0.3%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Aug 2024–Jul 2025.
42	Republic Services Inc. 13 awardees, including Environmental, Safety & Health Consulting Services, Inc., Advanced Chemical Transport LLC and NRC Gulf Environmental Services Inc. Top agencies DHS (Department of Homeland Security) DOI (Department of the Interior) Navy (Department of the Navy)	$18,359,492	0.3%	Rank history: not on the FY2021–FY2024 lists and #34 in FY2025; down 3 since Aug 2024–Jul 2025.
43	Ahtna-Arcadis 8(A) JV, LLC Top agencies Army (Department of the Army)	$18,147,756	0.3%	Rank history: not on the FY2021–FY2022 lists, #68 in FY2023, #50 in FY2024 and #64 in FY2025; up 44 since Aug 2024–Jul 2025.
44	The Source Group, Inc. Top agencies DLA (Defense Logistics Agency)	$16,999,321	0.2%	Rank history: #17 in FY2021, #41 in FY2022, not on the FY2023 list, #90 in FY2024 and not on the FY2025 list; up 57 since Aug 2024–Jul 2025.
45	Koman Government Solutions LLC Top agencies Navy (Department of the Navy) Army (Department of the Army) DHS (Department of Homeland Security)	$16,384,209	0.2%	Rank history: not on the FY2021–FY2023 lists, #67 in FY2024 and #54 in FY2025; up 11 since Aug 2024–Jul 2025.
46	Arrowhead Contracting, LLC Top agencies EPA (Environmental Protection Agency)	$16,307,417	0.2%	Rank history: not on the FY2021–FY2022 lists, #41 in FY2023, not on the FY2024 list and #49 in FY2025; up 36 since Aug 2024–Jul 2025.
47	C M C, Inc. Top agencies EPA (Environmental Protection Agency)	$15,674,519	0.2%	Rank history: #56 in FY2021, #30 in FY2022, #28 in FY2023, #38 in FY2024 and #79 in FY2025; up 5 since Aug 2024–Jul 2025.
48	Catawba Teapec LLC Top agencies DOE (Department of Energy)	$15,589,977	0.2%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Aug 2024–Jul 2025.
49	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)	$14,878,718	0.2%	Rank history: #51 in FY2021, #21 in FY2022, #46 in FY2023, #59 in FY2024 and #30 in FY2025; down 12 since Aug 2024–Jul 2025.
50	Bay West LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force) GSA (General Services Administration)	$14,342,974	0.2%	Rank history: #69 in FY2021, #70 in FY2022, #48 in FY2023, #55 in FY2024 and #37 in FY2025; down 5 since Aug 2024–Jul 2025.
51	Oneida Total Integrated Enterprises LLC Top agencies USAF (Department of the Air Force) DLA (Defense Logistics Agency) Army (Department of the Army)	$13,508,314	0.2%	Rank history: not on the FY2021–FY2023 lists, #71 in FY2024 and #60 in FY2025; up 24 since Aug 2024–Jul 2025.
52	Nakupuna Services-Errg JV LLC Top agencies Army (Department of the Army)	$13,212,648	0.2%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Aug 2024–Jul 2025.
53	Fidelis-Bbd, LLC Top agencies EPA (Environmental Protection Agency)	$12,956,387	0.2%	Rank history: not on the FY2021–FY2024 lists and #80 in FY2025; new, not ranked in Aug 2024–Jul 2025.
54	Olgoonik Corporation 2 awardees, including FPM Remediations, Inc. and Olgoonik Enterprises, LLC Top agencies USAF (Department of the Air Force) Army (Department of the Army) DHS (Department of Homeland Security)	$12,883,383	0.2%	Rank history: #34 in FY2021, #86 in FY2022, #57 in FY2023, #51 in FY2024 and #40 in FY2025; down 21 since Aug 2024–Jul 2025.
55	Arcadis U.s., Inc. Top agencies USAF (Department of the Air Force) Army (Department of the Army)	$12,592,845	0.2%	Rank history: not on the FY2021–FY2024 lists and #53 in FY2025; up 124 since Aug 2024–Jul 2025.
56	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)	$12,456,245	0.2%	Rank history: not on the FY2021 list, #61 in FY2022, #25 in FY2023, #30 in FY2024 and #55 in FY2025; down 32 since Aug 2024–Jul 2025.
57	LDS Kemron JV 4 LLC Top agencies Army (Department of the Army)	$12,062,560	0.2%	Rank history: not on the FY2021–FY2024 lists and #69 in FY2025; new, not ranked in Aug 2024–Jul 2025.
58	Ahtna, Incorporated Through Ahtna Engineering Services, LLC Top agencies USAF (Department of the Air Force) Army (Department of the Army)	$11,984,343	0.2%	Rank history: #30 in FY2021, #40 in FY2022, #44 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in Aug 2024–Jul 2025.
59	Lata-Cti Environmental Services LLC Top agencies USAF (Department of the Air Force) Army (Department of the Army)	$11,218,908	0.2%	Rank history: not on the FY2021 list, #94 in FY2022, not on the FY2023 list, #84 in FY2024 and #75 in FY2025; up 19 since Aug 2024–Jul 2025.
60	Aes-Esfs JV II LLC Top agencies Army (Department of the Army)	$10,961,047	0.2%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Aug 2024–Jul 2025.
61	J.f. Brennan Company, Inc. Top agencies EPA (Environmental Protection Agency)	$10,714,986	0.2%	Rank history: not on the FY2021 list, #12 in FY2022, not on the FY2023 list, #42 in FY2024 and #96 in FY2025; up 70 since Aug 2024–Jul 2025.
62	Leidos Holdings, Inc. Through Leidos, Inc. Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$10,606,769	0.2%	Rank history: #52 in FY2021, #55 in FY2022, #67 in FY2023, #97 in FY2024 and #45 in FY2025; down 11 since Aug 2024–Jul 2025.
63	Clean Harbors Inc. Through Clean Harbors Environmental Services Inc. Top agencies DHS (Department of Homeland Security) VA (Department of Veterans Affairs) USDA (Department of Agriculture)	$10,596,836	0.2%	Rank history: not on the FY2021–FY2024 lists and #56 in FY2025; down 3 since Aug 2024–Jul 2025.
64	S&K Mission Support, LLC Top agencies DOE (Department of Energy)	$10,377,427	0.2%	Rank history: not on the FY2021–FY2024 lists and #61 in FY2025; unchanged since Aug 2024–Jul 2025.
65	Cape-Weston JV3 LLC Top agencies Navy (Department of the Navy)	$10,234,959	0.1%	Rank history: not on the FY2021–FY2022 lists, #62 in FY2023, #33 in FY2024 and #44 in FY2025; down 12 since Aug 2024–Jul 2025.
66	Ahtna Global LLC Top agencies Army (Department of the Army)	$9,969,175	0.1%	Rank history: not on the FY2021–FY2024 lists and #39 in FY2025; down 11 since Aug 2024–Jul 2025.
67	Sevenson-Usa Environmental Joint Venture II Top agencies Navy (Department of the Navy)	$8,928,243	0.1%	Rank history: not on the FY2021 list, #33 in FY2022, #31 in FY2023, #58 in FY2024 and not on the FY2025 list; up 179 since Aug 2024–Jul 2025.
68	Engineering/Remediation Resources Group Inc. 2 awardees Top agencies Navy (Department of the Navy) USDA (Department of Agriculture) Army (Department of the Army)	$8,761,063	0.1%	Rank history: not on the FY2021–FY2023 lists, #78 in FY2024 and #57 in FY2025; up 11 since Aug 2024–Jul 2025.
69	Charter Contracting Company, LLC Top agencies Army (Department of the Army)	$8,714,241	0.1%	Rank history: not on the FY2021–FY2023 lists, #73 in FY2024 and not on the FY2025 list; new, not ranked in Aug 2024–Jul 2025.
70	T & T Marine Salvage, Inc. Top agencies DHS (Department of Homeland Security)	$8,659,524	0.1%	Rank history: not on the FY2021–FY2025 lists; up 205 since Aug 2024–Jul 2025.
71	WSP USA Solutions Inc 2 awardees, including WSP USA Environment & Infrastructure Inc. Top agencies USAF (Department of the Air Force) DLA (Defense Logistics Agency)	$8,552,173	0.1%	Rank history: not on the FY2021–FY2024 lists and #73 in FY2025; new, not ranked in Aug 2024–Jul 2025.
72	Bhate Environmental Associates, Inc. Top agencies Army (Department of the Army) USAF (Department of the Air Force) DLA (Defense Logistics Agency)	$8,519,110	0.1%	Rank history: #63 in FY2021, #50 in FY2022, #92 in FY2023, not on the FY2024 list and #88 in FY2025; up 60 since Aug 2024–Jul 2025.
73	Hgl-Portage JV LLC Top agencies EPA (Environmental Protection Agency)	$8,503,829	0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Aug 2024–Jul 2025.
74	Aergc JV LLC Top agencies Army (Department of the Army)	$8,326,564	0.1%	Rank history: not on the FY2021–FY2024 lists and #71 in FY2025; new, not ranked in Aug 2024–Jul 2025.
75	Wsp-Versar JV Through Versar-Wsp JV Top agencies EPA (Environmental Protection Agency)	$7,997,808	0.1%	Rank history: not on the FY2021–FY2025 lists; up 135 since Aug 2024–Jul 2025.
76	Pika-Insight JV LLC Top agencies Army (Department of the Army) Navy (Department of the Navy)	$7,629,490	0.1%	Rank history: not on the FY2021–FY2022 lists, #40 in FY2023 and not on the FY2024–FY2025 lists; up 106 since Aug 2024–Jul 2025.
77	Professional Project Services, Inc. Top agencies DOE (Department of Energy)	$7,374,567	0.1%	Rank history: #65 in FY2021, #63 in FY2022, not on the FY2023 list, #77 in FY2024 and #46 in FY2025; down 5 since Aug 2024–Jul 2025.
78	Conti Federal Services, LLC Top agencies EPA (Environmental Protection Agency) Army (Department of the Army)	$7,218,282	0.1%	Rank history: not on the FY2021–FY2023 lists, #45 in FY2024 and #35 in FY2025; down 28 since Aug 2024–Jul 2025.
79	Bhate Zapata, LLC Top agencies Army (Department of the Army)	$6,448,915	0.1%	Rank history: #35 in FY2021, #99 in FY2022, #79 in FY2023 and not on the FY2024–FY2025 lists; up 80 since Aug 2024–Jul 2025.
80	Resolve Marine Group Inc. Top agencies DHS (Department of Homeland Security)	$6,378,800	0.1%	Rank history: #73 in FY2021 and not on the FY2022–FY2025 lists; up 61 since Aug 2024–Jul 2025.
81	Hdr, Inc. 2 awardees, including HDR Aptim LLC and HDR Environmental, Operations and Construction, Inc. Top agencies EPA (Environmental Protection Agency) Army (Department of the Army) USAF (Department of the Air Force)	$6,362,718	0.1%	Rank history: #57 in FY2021, #46 in FY2022, #56 in FY2023 and not on the FY2024–FY2025 lists; up 3 since Aug 2024–Jul 2025.
82	Osage Nation Energy Services LLC Top agencies Army (Department of the Army)	$5,875,047	0.1%	Rank history: not on the FY2021–FY2024 lists and #81 in FY2025; up 122 since Aug 2024–Jul 2025.
83	Oneida-Stantec JV LLC Top agencies Army (Department of the Army)	$5,788,032	0.1%	Rank history: not on the FY2021–FY2024 lists and #89 in FY2025; new, not ranked in Aug 2024–Jul 2025.
84	North Wind Portage, Inc. Top agencies DOE (Department of Energy)	$5,524,520	0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Aug 2024–Jul 2025.
85	Cape-Weston JV1 LLC Top agencies Army (Department of the Army)	$5,492,866	0.1%	Rank history: not on the FY2021–FY2023 lists, #63 in FY2024 and #86 in FY2025; up 33 since Aug 2024–Jul 2025.
86	Roselin Charitar Top agencies Army (Department of the Army)	$5,472,166	0.1%	Rank history: not on the FY2021–FY2024 lists and #47 in FY2025; down 32 since Aug 2024–Jul 2025.
87	Noreas Environmental Services LLC Top agencies Army (Department of the Army)	$5,457,438	0.1%	Rank history: not on the FY2021–FY2022 lists, #86 in FY2023, #75 in FY2024 and #59 in FY2025; down 21 since Aug 2024–Jul 2025.
88	Sargent Corporation Top agencies Army (Department of the Army)	$5,414,000	0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Aug 2024–Jul 2025.
89	LPS Kemron JV LLC Top agencies EPA (Environmental Protection Agency)	$5,411,026	0.1%	Rank history: not on the FY2021–FY2024 lists and #87 in FY2025; up 17 since Aug 2024–Jul 2025.
90	Meadows Cmpg, Inc. Top agencies Navy (Department of the Navy) Army (Department of the Army)	$5,369,804	0.1%	Rank history: #94 in FY2021 and not on the FY2022–FY2025 lists; up 36 since Aug 2024–Jul 2025.
91	Noreas Aptim Environmental Remediation JV 3 awardees, including Noreas Dawson Environmental Remediation JV and Noreas, Inc. Top agencies Navy (Department of the Navy) Army (Department of the Army) DOI (Department of the Interior)	$5,367,726	0.1%	Rank history: not on the FY2021–FY2025 lists; up 104 since Aug 2024–Jul 2025.
92	A and M Engineering & Environmental Services, Inc. Top agencies EPA (Environmental Protection Agency)	$5,239,200	0.1%	Rank history: #75 in FY2021, #85 in FY2022, not on the FY2023 list, #88 in FY2024 and #74 in FY2025; down 1 since Aug 2024–Jul 2025.
93	Applied Aquatic Management, Inc. Top agencies Army (Department of the Army)	$5,151,221	0.1%	Rank history: not on the FY2021 list, #66 in FY2022, not on the FY2023–FY2024 lists and #99 in FY2025; up 4 since Aug 2024–Jul 2025.
94	Gsina-Gilbane II JV LLC Top agencies USAF (Department of the Air Force)	$4,984,386	0.1%	Rank history: not on the FY2021–FY2023 lists, #98 in FY2024 and #95 in FY2025; down 5 since Aug 2024–Jul 2025.
95	Cedar International Services, LLC Top agencies Army (Department of the Army)	$4,981,785	0.1%	Rank history: not on the FY2021–FY2024 lists and #91 in FY2025; new, not ranked in Aug 2024–Jul 2025.
96	Verina Consulting Group LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$4,901,992	0.1%	Rank history: not on the FY2021–FY2024 lists and #97 in FY2025; up 92 since Aug 2024–Jul 2025.
97	Williams Diversified Materials, Inc. Top agencies EPA (Environmental Protection Agency)	$4,849,351	0.1%	Rank history: not on the FY2021–FY2025 lists; up 53 since Aug 2024–Jul 2025.
98	Aptim Geosyntec JV LLC Top agencies Army (Department of the Army)	$4,725,781	0.1%	Rank history: not on the FY2021–FY2025 lists; up 243 since Aug 2024–Jul 2025.
99	Pika International Inc. Top agencies Army (Department of the Army)	$4,697,209	0.1%	Rank history: not on the FY2021–FY2023 lists, #39 in FY2024 and #68 in FY2025; down 61 since Aug 2024–Jul 2025.
100	Major Contracting Services, Inc. Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$4,671,886	0.1%	Rank history: not on the FY2021–FY2024 lists and #94 in FY2025; up 21 since Aug 2024–Jul 2025.

Rankings for the codes under NAICS 5629

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 $6.88 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.
• Period: the trailing 12 months end with the last month that ended at least 90 days ago, because the Department of Defense reports its contract actions to FPDS about 90 days late. The list is rebuilt each night.
• Rank changes compare with Aug 2024–Jul 2025. "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.
• Placeholder recipients FPDS uses when it names no company ("Miscellaneous Foreign Contractors" and the like) aren't ranked.

Quick answers