Top 100 Contractors in PSC F999: Other Environmental Services, Studies, and Analytical Support, Aug 2025–Jul 2026

Full ranking

Rank	Contractor	Net obligations	Share	Trend
1	Amentum Holdings, Inc. 5 awardees, including Idaho Environmental Coalition LLC, United Cleanup Oak Ridge LLC and Southern Ohio Cleanup Company LLC Top agencies DOE (Department of Energy)	$1,391,631,944	41.7%	Rank history: not on the FY2021–FY2024 lists and #2 in FY2025; up 1 since Aug 2024–Jul 2025.
2	Southern Ohio Cleanup Company LLC Top agencies DOE (Department of Energy)	$143,819,066	4.3%	Rank history: not on the FY2021–FY2024 lists and #17 in FY2025; up 80 since Aug 2024–Jul 2025.
3	BWX Technologies, Inc. 2 awardees, including Nuclear Fuel Services Inc. and Bwxt Nuclear Operations Group, Inc. Top agencies DOE (Department of Energy)	$141,424,634	4.2%	Rank history: not on the FY2021 list, #15 in FY2022, #3 in FY2023, #8 in FY2024 and #7 in FY2025; up 4 since Aug 2024–Jul 2025.
4	L3Harris Technologies, Inc. Through Bwxt Ordnance Tennessee, Inc. Top agencies DOE (Department of Energy)	$130,800,000	3.9%	Rank history: not on the FY2021–FY2024 lists and #9 in FY2025; new, not ranked in Aug 2024–Jul 2025.
5	West Valley Cleanup Alliance, LLC Top agencies DOE (Department of Energy)	$122,330,141	3.7%	Rank history: not on the FY2021–FY2024 lists and #11 in FY2025; up 63 since Aug 2024–Jul 2025.
6	Hanford Laboratory Management and Integration LLC Top agencies DOE (Department of Energy)	$107,422,566	3.2%	Rank history: #9 in FY2021, #4 in FY2022, #6 in FY2023, #5 in FY2024 and #5 in FY2025; down 2 since Aug 2024–Jul 2025.
7	Guidehouse Inc. 3 awardees, including Aptim Federal Services, LLC and Aptim-Amentum Alaska Decommissioning LLC Top agencies DOE (Department of Energy) Army (Department of the Army) Navy (Department of the Navy)	$86,945,719	2.6%	Rank history: not on the FY2021–FY2023 lists, #7 in FY2024 and #4 in FY2025; down 1 since Aug 2024–Jul 2025.
8	Hydrogeologic, Inc. Top agencies Army (Department of the Army) EPA (Environmental Protection Agency)	$59,213,962	1.8%	Rank history: #4 in FY2021, #8 in FY2022, #7 in FY2023, #10 in FY2024 and #8 in FY2025; up 1 since Aug 2024–Jul 2025.
9	Ducks Unlimited, Inc. Top agencies Army (Department of the Army)	$56,000,000	1.7%	Rank history: not on the FY2021–FY2024 lists and #25 in FY2025; new, not ranked in Aug 2024–Jul 2025.
10	Navarro Research and Engineering, Inc. Top agencies DOE (Department of Energy)	$49,029,345	1.5%	Rank history: #12 in FY2021, #13 in FY2022, #11 in FY2023, #14 in FY2024 and #12 in FY2025; down 2 since Aug 2024–Jul 2025.
11	Leidos Holdings, Inc. 4 awardees, including Leidos, Inc. Top agencies DHS (Department of Homeland Security) Army (Department of the Army) USAF (Department of the Air Force)	$32,839,180	1.0%	Rank history: #27 in FY2021, #18 in FY2022, #24 in FY2023, #20 in FY2024 and #14 in FY2025; up 8 since Aug 2024–Jul 2025.
12	Sevenson Environmental Services, Inc. Top agencies EPA (Environmental Protection Agency) Army (Department of the Army)	$29,057,260	0.9%	Rank history: #8 in FY2021, #2 in FY2022, #9 in FY2023, #4 in FY2024 and #10 in FY2025; down 2 since Aug 2024–Jul 2025.
13	Bristol Bay Native Corporation 6 awardees, including SES Civil and Environmental LLC, Aerostar Environmental and Construction LLC and Tekpro Support Services, LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force) Navy (Department of the Navy)	$28,200,283	0.8%	Rank history: not on the FY2021–FY2022 lists, #89 in FY2023, #99 in FY2024 and #19 in FY2025; up 45 since Aug 2024–Jul 2025.
14	EA Engineering Science and Technology Inc. PBC Top agencies Army (Department of the Army) EPA (Environmental Protection Agency) DOI (Department of the Interior)	$26,823,533	0.8%	Rank history: #10 in FY2021, #11 in FY2022, #2 in FY2023, #15 in FY2024 and #13 in FY2025; down 3 since Aug 2024–Jul 2025.
15	Gulf South Research Corp Top agencies DHS (Department of Homeland Security) Navy (Department of the Navy) OSD (Office of the Secretary of Defense)	$26,553,589	0.8%	Rank history: not on the FY2021–FY2024 lists and #82 in FY2025; up 163 since Aug 2024–Jul 2025.
16	Eastern Research Group Inc. Top agencies EPA (Environmental Protection Agency) USDA (Department of Agriculture) GSA (General Services Administration)	$20,031,146	0.6%	Rank history: #49 in FY2021, #42 in FY2022, #25 in FY2023, #17 in FY2024 and #29 in FY2025; up 41 since Aug 2024–Jul 2025.
17	Environmental Restoration LLC Top agencies EPA (Environmental Protection Agency)	$19,302,243	0.6%	Rank history: #23 in FY2021, #6 in FY2022, #12 in FY2023, #32 in FY2024 and #27 in FY2025; up 20 since Aug 2024–Jul 2025.
18	Sustainment & Restoration Services, LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$18,502,127	0.6%	Rank history: not on the FY2021–FY2023 lists, #79 in FY2024 and #15 in FY2025; up 10 since Aug 2024–Jul 2025.
19	Environmental Rail Solutions Inc. Top agencies Army (Department of the Army)	$17,957,146	0.5%	Rank history: not on the FY2021 list, #47 in FY2022, #31 in FY2023, #23 in FY2024 and #33 in FY2025; up 13 since Aug 2024–Jul 2025.
20	Calista Corp 3 awardees, including Brice Engineering, LLC, Brice Solutions, LLC and Brice Integrated LLC Top agencies Army (Department of the Army) DHS (Department of Homeland Security) USAF (Department of the Air Force)	$16,164,831	0.5%	Rank history: #61 in FY2021, #49 in FY2022, not on the FY2023–FY2024 lists and #24 in FY2025; new, not ranked in Aug 2024–Jul 2025.
21	Catawba Teapec LLC Top agencies DOE (Department of Energy)	$15,589,977	0.5%	Rank history: not on the FY2021–FY2024 lists and #94 in FY2025; new, not ranked in Aug 2024–Jul 2025.
22	Gryphon Environmental, LLC Top agencies Army (Department of the Army)	$14,375,789	0.4%	Rank history: not on the FY2021–FY2024 lists and #83 in FY2025; up 102 since Aug 2024–Jul 2025.
23	The Solution Foundry, LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$12,816,399	0.4%	Rank history: #40 in FY2021, #36 in FY2022, #40 in FY2023, #36 in FY2024 and #30 in FY2025; up 6 since Aug 2024–Jul 2025.
24	Right Way Environmental Contractors, Inc. Top agencies Army (Department of the Army)	$12,510,751	0.4%	Rank history: not on the FY2021–FY2024 lists and #28 in FY2025; new, not ranked in Aug 2024–Jul 2025.
25	AECOM 6 awardees, including AECOM Technical Services, Inc., Environmental Management & Planning Solutions LLC and AECOM International Inc. Top agencies DOI (Department of the Interior) Army (Department of the Army) EPA (Environmental Protection Agency)	$11,780,962	0.4%	Rank history: #1 in FY2021, #1 in FY2022, not on the FY2023–FY2024 lists and #23 in FY2025; up 22 since Aug 2024–Jul 2025.
26	Sundance Consultants, LLC 4 awardees, including Sundance EA Associates II and Sundance - EA Alliance, LLC Top agencies DHS (Department of Homeland Security) Navy (Department of the Navy) DOI (Department of the Interior)	$11,473,882	0.3%	Rank history: not on the FY2021–FY2024 lists and #90 in FY2025; up 64 since Aug 2024–Jul 2025.
27	Montezuma Wetlands LLC Top agencies Army (Department of the Army)	$11,177,050	0.3%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Aug 2024–Jul 2025.
28	Bering Straits Native Corporation Through Paragon Professional Services LLC Top agencies DOE (Department of Energy) Army (Department of the Army)	$10,514,780	0.3%	Rank history: not on the FY2021–FY2024 lists and #18 in FY2025; new, not ranked in Aug 2024–Jul 2025.
29	S&K Mission Support, LLC Top agencies DOE (Department of Energy)	$10,377,427	0.3%	Rank history: not on the FY2021–FY2023 lists, #68 in FY2024 and #32 in FY2025; up 1 since Aug 2024–Jul 2025.
30	Tetra Tech, Inc. 9 awardees, including Tetra TECH EC, Inc. Top agencies Army (Department of the Army) NASA (National Aeronautics and Space Administration) DOE (Department of Energy)	$9,444,898	0.3%	Rank history: #15 in FY2021, #17 in FY2022, #19 in FY2023, #19 in FY2024 and #16 in FY2025; down 15 since Aug 2024–Jul 2025.
31	Environmental Chemical Corporation 2 awardees, including ECC Environmental LLC Top agencies Army (Department of the Army) EPA (Environmental Protection Agency) USAF (Department of the Air Force)	$8,958,142	0.3%	Rank history: #13 in FY2021, #19 in FY2022, #14 in FY2023, #16 in FY2024 and #1 in FY2025; down 10 since Aug 2024–Jul 2025.
32	Bay West LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$8,949,493	0.3%	Rank history: #47 in FY2021, #53 in FY2022, #21 in FY2023, #22 in FY2024 and #21 in FY2025; down 15 since Aug 2024–Jul 2025.
33	LDS Kemron JV 4 LLC Top agencies Army (Department of the Army)	$8,485,821	0.3%	Rank history: not on the FY2021–FY2024 lists and #35 in FY2025; new, not ranked in Aug 2024–Jul 2025.
34	Environmental Compliance Consultants, Inc. Top agencies Army (Department of the Army)	$8,218,782	0.2%	Rank history: not on the FY2021–FY2024 lists and #38 in FY2025; new, not ranked in Aug 2024–Jul 2025.
35	Research Planning, Inc. Top agencies Commerce (Department of Commerce)	$8,096,542	0.2%	Rank history: not on the FY2021–FY2023 lists, #70 in FY2024 and #67 in FY2025; up 37 since Aug 2024–Jul 2025.
36	Ahtna-Arcadis 8(A) JV, LLC Top agencies Army (Department of the Army)	$7,927,470	0.2%	Rank history: not on the FY2021–FY2022 lists, #30 in FY2023, #53 in FY2024 and #71 in FY2025; up 25 since Aug 2024–Jul 2025.
37	Parsons Corporation Through Parsons Government Services Inc. Top agencies Army (Department of the Army)	$7,786,717	0.2%	Rank history: not on the FY2021 list, #14 in FY2022, #55 in FY2023, #38 in FY2024 and #31 in FY2025; down 12 since Aug 2024–Jul 2025.
38	Battelle Memorial Institute Top agencies HHS (Department of Health and Human Services) EPA (Environmental Protection Agency) Navy (Department of the Navy)	$7,700,394	0.2%	Rank history: #29 in FY2021, not on the FY2022–FY2023 lists, #75 in FY2024 and #45 in FY2025; up 36 since Aug 2024–Jul 2025.
39	Bhate Environmental Associates, Inc. Top agencies Army (Department of the Army) USAF (Department of the Air Force) Navy (Department of the Navy)	$7,460,329	0.2%	Rank history: #57 in FY2021, #52 in FY2022, #68 in FY2023, #87 in FY2024 and #63 in FY2025; up 67 since Aug 2024–Jul 2025.
40	Global Science & Technology, LLC Top agencies Commerce (Department of Commerce)	$7,026,430	0.2%	Rank history: not on the FY2021 list, #61 in FY2022, #56 in FY2023, #45 in FY2024 and #41 in FY2025; up 35 since Aug 2024–Jul 2025.
41	Vernadero Group Inc. Top agencies DHS (Department of Homeland Security) Navy (Department of the Navy) Army (Department of the Army)	$6,990,771	0.2%	Rank history: #66 in FY2021, not on the FY2022 list, #64 in FY2023, #64 in FY2024 and not on the FY2025 list; up 45 since Aug 2024–Jul 2025.
42	GV Henson Creek LLC Top agencies DHS (Department of Homeland Security)	$6,658,663	0.2%	Rank history: not on the FY2021–FY2024 lists and #44 in FY2025; new, not ranked in Aug 2024–Jul 2025.
43	Bhate Zapata, LLC Top agencies Army (Department of the Army)	$6,481,009	0.2%	Rank history: #18 in FY2021, #68 in FY2022, #37 in FY2023, #76 in FY2024 and not on the FY2025 list; up 71 since Aug 2024–Jul 2025.
44	Osage Nation Energy Services LLC Top agencies Army (Department of the Army)	$6,092,536	0.2%	Rank history: not on the FY2021–FY2025 lists; up 245 since Aug 2024–Jul 2025.
45	Bluestone Interspec JV, LLC Top agencies Navy (Department of the Navy)	$5,837,402	0.2%	Rank history: not on the FY2021–FY2022 lists, #95 in FY2023, #86 in FY2024 and #52 in FY2025; up 59 since Aug 2024–Jul 2025.
46	Verina Consulting Group LLC Top agencies Army (Department of the Army)	$5,608,184	0.2%	Rank history: not on the FY2021–FY2022 lists, #92 in FY2023, not on the FY2024 list and #39 in FY2025; up 37 since Aug 2024–Jul 2025.
47	Energy Technology Alliance LLC Top agencies DOE (Department of Energy)	$5,598,306	0.2%	Rank history: not on the FY2021–FY2025 lists; up 382 since Aug 2024–Jul 2025.
48	Olgoonik Corporation Through FPM Remediations, Inc. Top agencies USAF (Department of the Air Force) Army (Department of the Army) DHS (Department of Homeland Security)	$5,589,488	0.2%	Rank history: not on the FY2021–FY2022 lists, #71 in FY2023, #26 in FY2024 and #26 in FY2025; down 32 since Aug 2024–Jul 2025.
49	Toeroek Associates, Inc. Top agencies EPA (Environmental Protection Agency)	$5,493,828	0.2%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Aug 2024–Jul 2025.
50	The Aleut Corporation 2 awardees, including Aleut Technical Services, LLC and Aleut Services, LLC Top agencies EPA (Environmental Protection Agency)	$5,319,946	0.2%	Rank history: #58 in FY2021, not on the FY2022 list, #97 in FY2023, not on the FY2024 list and #80 in FY2025; new, not ranked in Aug 2024–Jul 2025.
51	Bluestone Environmental Group, Inc. Top agencies Army (Department of the Army) EPA (Environmental Protection Agency) USDA (Department of Agriculture)	$5,251,179	0.2%	Rank history: not on the FY2021–FY2023 lists, #81 in FY2024 and #51 in FY2025; up 9 since Aug 2024–Jul 2025.
52	JFL-WCS Partners LLC Through Waste Control Specialists LLC Top agencies DOE (Department of Energy)	$5,250,000	0.2%	Rank history: not on the FY2021–FY2022 lists, #59 in FY2023, #31 in FY2024 and #46 in FY2025; down 26 since Aug 2024–Jul 2025.
53	Ciri Development Corporation 4 awardees, including North Wind General Contractors LLC, North Wind Site Services LLC and North Wind Resource Consulting LLC Top agencies DOI (Department of the Interior) Army (Department of the Army) USDA (Department of Agriculture)	$5,019,863	0.2%	Rank history: not on the FY2021 list, #5 in FY2022, #78 in FY2023, #94 in FY2024 and #47 in FY2025; up 108 since Aug 2024–Jul 2025.
54	LMI Consulting, LLC Top agencies DHS (Department of Homeland Security) GSA (General Services Administration)	$5,000,183	0.1%	Rank history: not on the FY2021–FY2024 lists and #50 in FY2025; up 141 since Aug 2024–Jul 2025.
55	Ayuda Companies Top agencies Navy (Department of the Navy) NASA (National Aeronautics and Space Administration) Army (Department of the Army)	$4,866,709	0.1%	Rank history: not on the FY2021–FY2025 lists; up 156 since Aug 2024–Jul 2025.
56	Tierra Right of Way Services Ltd Top agencies DHS (Department of Homeland Security)	$4,820,684	0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Aug 2024–Jul 2025.
57	WSP USA Solutions Inc 3 awardees, including WSP USA Environment & Infrastructure Inc. Top agencies USAF (Department of the Air Force) GSA (General Services Administration) EPA (Environmental Protection Agency)	$4,588,731	0.1%	Rank history: not on the FY2021–FY2025 lists; up 87 since Aug 2024–Jul 2025.
58	Noreas Aptim Environmental Remediation JV 2 awardees, including Noreas, Inc. Top agencies Navy (Department of the Navy) Army (Department of the Army)	$4,485,750	0.1%	Rank history: not on the FY2021–FY2025 lists; up 101 since Aug 2024–Jul 2025.
59	Noblis, Inc. Top agencies USAF (Department of the Air Force)	$4,277,395	0.1%	Rank history: not on the FY2021 list, #86 in FY2022, #88 in FY2023, not on the FY2024 list and #66 in FY2025; down 4 since Aug 2024–Jul 2025.
60	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)	$4,176,490	0.1%	Rank history: #11 in FY2021, #12 in FY2022, #36 in FY2023, #29 in FY2024 and #22 in FY2025; down 37 since Aug 2024–Jul 2025.
61	Bb&E, Inc. Top agencies NASA (National Aeronautics and Space Administration) DOI (Department of the Interior)	$3,920,425	0.1%	Rank history: #48 in FY2021, #55 in FY2022, #60 in FY2023, #48 in FY2024 and #37 in FY2025; down 10 since Aug 2024–Jul 2025.
62	Q & A Diversified LLC Top agencies Army (Department of the Army)	$3,919,621	0.1%	Rank history: not on the FY2021–FY2024 lists and #55 in FY2025; down 9 since Aug 2024–Jul 2025.
63	Genwest Systems Inc. Top agencies Commerce (Department of Commerce)	$3,800,518	0.1%	Rank history: #43 in FY2021, #51 in FY2022, #61 in FY2023, not on the FY2024 list and #69 in FY2025; up 30 since Aug 2024–Jul 2025.
64	Charter Contracting Company, LLC Top agencies Army (Department of the Army)	$3,774,241	0.1%	Rank history: not on the FY2021–FY2023 lists, #35 in FY2024 and not on the FY2025 list; new, not ranked in Aug 2024–Jul 2025.
65	Enhanced Environmental & Emergency Services Inc. Top agencies Navy (Department of the Navy)	$3,735,914	0.1%	Rank history: not on the FY2021–FY2024 lists and #70 in FY2025; up 208 since Aug 2024–Jul 2025.
66	Huntington Ingalls Industries, Inc. Through Newport News Nuclear Bwxt-Los Alamos LLC Top agencies DOE (Department of Energy)	$3,677,177	0.1%	Rank history: #51 in FY2021, #39 in FY2022, #39 in FY2023, not on the FY2024 list and #42 in FY2025; up 57 since Aug 2024–Jul 2025.
67	Signature Science, LLC Top agencies DFAS (Defense Finance and Accounting Service)	$3,561,183	0.1%	Rank history: not on the FY2021–FY2024 lists and #77 in FY2025; up 33 since Aug 2024–Jul 2025.
68	Chemtex Environmental Laboratory, Inc. Top agencies EPA (Environmental Protection Agency)	$3,500,000	0.1%	Rank history: not on the FY2021 list, #99 in FY2022, not on the FY2023–FY2024 lists and #54 in FY2025; up 37 since Aug 2024–Jul 2025.
69	Bonner Analytical Testing Co Top agencies EPA (Environmental Protection Agency)	$3,500,000	0.1%	Rank history: not on the FY2021 list, #94 in FY2022, not on the FY2023–FY2024 lists and #56 in FY2025; up 25 since Aug 2024–Jul 2025.
70	Itms - GES JV LLC Top agencies Army (Department of the Army)	$3,480,923	0.1%	Rank history: not on the FY2021–FY2025 lists; up 133 since Aug 2024–Jul 2025.
71	Cherokee Nation 3 awardees, including Cherokee Nation Government Solutions, L.L.C., Cherokee Nation Integrated Health, L.L.C. and Cherokee Federal Solutions, L.L.C. Top agencies Army (Department of the Army) HHS (Department of Health and Human Services)	$3,415,435	0.1%	Rank history: #68 in FY2021, not on the FY2022 list, #96 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in Aug 2024–Jul 2025.
72	Skeo Solutions, Inc. Top agencies EPA (Environmental Protection Agency)	$3,372,978	0.1%	Rank history: #90 in FY2021, #22 in FY2022, #33 in FY2023, #27 in FY2024 and #62 in FY2025; down 29 since Aug 2024–Jul 2025.
73	Industrial Economics Inc. Top agencies DOE (Department of Energy) EPA (Environmental Protection Agency) DOI (Department of the Interior)	$3,367,469	0.1%	Rank history: #95 in FY2021, #66 in FY2022, #51 in FY2023, #56 in FY2024 and #68 in FY2025; up 26 since Aug 2024–Jul 2025.
74	General Dynamics Corporation Through General Dynamics Information Technology, Inc. Top agencies EPA (Environmental Protection Agency)	$3,262,962	0.1%	Rank history: #37 in FY2021, not on the FY2022 list, #63 in FY2023, #42 in FY2024 and not on the FY2025 list; down 8 since Aug 2024–Jul 2025.
75	SOL Solutions LLC Top agencies Army (Department of the Army) Navy (Department of the Navy)	$3,182,113	0.1%	Rank history: not on the FY2021–FY2023 lists, #34 in FY2024 and #58 in FY2025; down 11 since Aug 2024–Jul 2025.
76	Arcadis U.s., Inc. Top agencies Army (Department of the Army)	$3,171,374	0.1%	Rank history: not on the FY2021–FY2024 lists and #34 in FY2025; down 31 since Aug 2024–Jul 2025.
77	Ocean Associates Inc. Top agencies Commerce (Department of Commerce)	$3,162,531	0.1%	Rank history: not on the FY2021–FY2025 lists; up 73 since Aug 2024–Jul 2025.
78	Teya Support Services LLC Top agencies Navy (Department of the Navy)	$3,131,747	0.1%	Rank history: not on the FY2021–FY2025 lists; up 67 since Aug 2024–Jul 2025.
79	Ch2M Hill, Inc. Top agencies EPA (Environmental Protection Agency)	$3,126,048	0.1%	Rank history: not on the FY2021 list, #83 in FY2022, not on the FY2023 list, #50 in FY2024 and #87 in FY2025; up 52 since Aug 2024–Jul 2025.
80	Tehama ECS LLC Top agencies Army (Department of the Army) DOI (Department of the Interior)	$3,121,293	0.1%	Rank history: not on the FY2021–FY2025 lists; up 268 since Aug 2024–Jul 2025.
81	ICF International Inc. Through ICF Incorporated, L.L.C. Top agencies DOI (Department of the Interior) EPA (Environmental Protection Agency)	$3,000,588	0.1%	Rank history: not on the FY2021–FY2023 lists, #43 in FY2024 and #61 in FY2025; down 27 since Aug 2024–Jul 2025.
82	The Chenega Corporation 3 awardees, including Chenega Reliable Services LLC and C2 Alaska, LLC Top agencies Army (Department of the Army) DOI (Department of the Interior)	$2,960,625	0.1%	Rank history: not on the FY2021–FY2024 lists and #95 in FY2025; new, not ranked in Aug 2024–Jul 2025.
83	Environmental Research Group LLC Top agencies Army (Department of the Army) Navy (Department of the Navy) VA (Department of Veterans Affairs)	$2,874,958	0.1%	Rank history: not on the FY2021–FY2022 lists, #76 in FY2023, #97 in FY2024 and not on the FY2025 list; up 71 since Aug 2024–Jul 2025.
84	Hana Engineers & Consultants LLC Top agencies EPA (Environmental Protection Agency) Army (Department of the Army)	$2,796,717	0.1%	Rank history: not on the FY2021–FY2023 lists, #60 in FY2024 and not on the FY2025 list; up 24 since Aug 2024–Jul 2025.
85	Ea-Bay West Joint Venture LLC Top agencies Army (Department of the Army)	$2,780,382	0.1%	Rank history: not on the FY2021–FY2022 lists, #83 in FY2023, #58 in FY2024 and not on the FY2025 list; down 7 since Aug 2024–Jul 2025.
86	Grunley Construction Co., Inc. Top agencies Army (Department of the Army)	$2,661,448	0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Aug 2024–Jul 2025.
87	Claene Group LLC Top agencies Army (Department of the Army)	$2,623,510	0.1%	Rank history: not on the FY2021–FY2024 lists and #100 in FY2025; up 33 since Aug 2024–Jul 2025.
88	Copperhead Environmental Consulting Inc. Top agencies DOI (Department of the Interior)	$2,593,604	0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Aug 2024–Jul 2025.
89	Azura Consulting LLC Top agencies Commerce (Department of Commerce)	$2,529,727	0.1%	Rank history: not on the FY2021 list, #88 in FY2022, #73 in FY2023, #77 in FY2024 and #81 in FY2025; down 10 since Aug 2024–Jul 2025.
90	Koman ECO Ageiss JV LLC Top agencies USAF (Department of the Air Force) Army (Department of the Army)	$2,483,239	0.1%	Rank history: not on the FY2021–FY2024 lists and #78 in FY2025; down 6 since Aug 2024–Jul 2025.
91	Dawson Solutions LLC Through Laukoa Environmental Solutions, Inc. Top agencies DHS (Department of Homeland Security) USAF (Department of the Air Force) Army (Department of the Army)	$2,383,118	0.1%	Rank history: not on the FY2021–FY2022 lists, #69 in FY2023, #9 in FY2024 and #79 in FY2025; up 133 since Aug 2024–Jul 2025.
92	Propel Solutions LLC Top agencies Commerce (Department of Commerce)	$2,375,984	0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Aug 2024–Jul 2025.
93	Haztrain Inc. Top agencies Army (Department of the Army)	$2,342,978	0.1%	Rank history: not on the FY2021–FY2025 lists; up 41 since Aug 2024–Jul 2025.
94	The NDN Companies Top agencies Army (Department of the Army) EPA (Environmental Protection Agency) DOT (Department of Transportation)	$2,306,199	0.1%	Rank history: not on the FY2021–FY2025 lists; up 33 since Aug 2024–Jul 2025.
95	Lata-Cti Environmental Services LLC Top agencies USAF (Department of the Air Force)	$2,304,906	0.1%	Rank history: not on the FY2021–FY2025 lists; up 220 since Aug 2024–Jul 2025.
96	Talces JV, LLC Top agencies USAF (Department of the Air Force)	$2,296,513	0.1%	Rank history: not on the FY2021–FY2022 lists, #54 in FY2023, #37 in FY2024 and not on the FY2025 list; down 62 since Aug 2024–Jul 2025.
97	Mar-Len Environmental, Inc. Top agencies Army (Department of the Army)	$2,230,011	0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Aug 2024–Jul 2025.
98	Integrated Systems Solutions, Inc. Top agencies Commerce (Department of Commerce)	$2,226,979	0.1%	Rank history: not on the FY2021–FY2025 lists; up 14 since Aug 2024–Jul 2025.
99	Ardl Inc. Top agencies Army (Department of the Army)	$2,212,192	0.1%	Rank history: #31 in FY2021, not on the FY2022 list, #66 in FY2023, not on the FY2024 list and #86 in FY2025; up 11 since Aug 2024–Jul 2025.
100	Fpm-Aecom JV1 2 awardees, including Fpm-Aecom JV2 Top agencies DOE (Department of Energy) Army (Department of the Army) USAF (Department of the Air Force)	$2,202,302	0.1%	Rank history: not on the FY2021–FY2022 lists, #16 in FY2023, #33 in FY2024 and #75 in FY2025; down 73 since Aug 2024–Jul 2025.

How this ranking works

• Source: every contract action FPDS records (as published on SAM.gov) in the period, as GovTribe received it.
• Amounts are net obligations: what was obligated, less what was deobligated. Shares are of $3.34 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