Top 100 Contractors in PSC B510: Environmental Studies and Assessments, FY2023

Name: Top 100 Contractors in PSC B510: Environmental Studies and Assessments, FY2023
Creator: GovTribe

Parent companies by net contract obligations Oct 1, 2022 – Sep 30, 2023 Code page on GovTribe

The top 10 won 42% of FY2023 PSC B510 contract dollars

Contract obligations: $224,166,265 Net of deobligations, by contracts coded PSC B510
Contractors: 334 Parent companies with an obligation
Largest contractor: Tetra Tech, Inc. $19.3 million, 7.9% 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	Tetra Tech, Inc. 5 awardees, including Tetra TECH International Inc. Zweigniederlassung Deutschland Top agencies EPA (Environmental Protection Agency) DHS (Department of Homeland Security) USAF (Department of the Air Force)	$19,320,885	7.9%	Rank history: #7 in FY2021, #2 in FY2022, #3 in FY2024 and #2 in FY2025; up 1 since FY2022.
2	Environmental Management & Planning Solutions LLC 2 awardees Top agencies DOI (Department of the Interior) USDA (Department of Agriculture)	$16,426,766	6.7%	Rank history: #3 in FY2021, #4 in FY2022, #70 in FY2024 and not on the FY2025 list; up 2 since FY2022.
3	AECOM 2 awardees, including AECOM Technical Services, Inc. and AECOM Italia S.P.A. Top agencies DHS (Department of Homeland Security) DOI (Department of the Interior) USAF (Department of the Air Force)	$15,372,134	6.3%	Rank history: #22 in FY2021, #5 in FY2022, #12 in FY2024 and #30 in FY2025; up 2 since FY2022.
4	Pe Ayuda Joint Venture LLC Top agencies Army (Department of the Army)	$10,103,482	4.1%	Rank history: not on the FY2021–FY2022 lists, not on the FY2024 list and #17 in FY2025; new.
5	Swca Incorporated Top agencies DOI (Department of the Interior) USDA (Department of Agriculture)	$9,750,951	4.0%	Rank history: #21 in FY2021, #9 in FY2022 and not on the FY2024–FY2025 lists; up 4 since FY2022.
6	Leidos Holdings, Inc. 3 awardees, including Leidos, Inc. Top agencies HUD (Department of Housing and Urban Development) OSD (Office of the Secretary of Defense) Army (Department of the Army)	$8,334,902	3.4%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
7	Pb&A / CSS JV, Llc. Top agencies EPA (Environmental Protection Agency)	$6,587,932	2.7%	Rank history: not on the FY2021 list, #6 in FY2022, #40 in FY2024 and not on the FY2025 list; down 1 since FY2022.
8	ICF International, Inc. Through ICF Incorporated, L.L.C. Top agencies DOI (Department of the Interior) USDA (Department of Agriculture) DOT (Department of Transportation)	$6,051,930	2.5%	Rank history: #5 in FY2021, #3 in FY2022, #26 in FY2024 and not on the FY2025 list; down 5 since FY2022.
9	Jacobs Engineering Group Inc. Top agencies Army (Department of the Army)	$5,709,017	2.3%	Rank history: not on the FY2021 list, #7 in FY2022 and not on the FY2024–FY2025 lists; down 2 since FY2022.
10	The Texas A&M University System 2 awardees, including Texas A&M Agrilife Research and Texas A & M University Kingsville Top agencies DOI (Department of the Interior)	$5,152,353	2.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
11	State of California Controllers Office 2 awardees, including University of California, Davis and California State University Bakersfield Top agencies EPA (Environmental Protection Agency) DOI (Department of the Interior)	$4,922,793	2.0%	Rank history: #10 in FY2021, #19 in FY2022, #25 in FY2024 and not on the FY2025 list; up 8 since FY2022.
12	Stantec Inc. 3 awardees, including Stantec Consulting Services Inc. Top agencies HHS (Department of Health and Human Services) GSA (General Services Administration)	$4,853,905	2.0%	Rank history: not on the FY2021–FY2022 lists, #31 in FY2024 and #20 in FY2025; new.
13	Eastern Research Group Inc. Top agencies EPA (Environmental Protection Agency) USDA (Department of Agriculture)	$4,775,551	1.9%	Rank history: #2 in FY2021, #12 in FY2022, #7 in FY2024 and #6 in FY2025; down 1 since FY2022.
14	WSP USA Solutions Inc. Top agencies DOE (Department of Energy) GSA (General Services Administration) DHS (Department of Homeland Security)	$4,494,763	1.8%	Rank history: #8 in FY2021, #8 in FY2022, #21 in FY2024 and not on the FY2025 list; down 6 since FY2022.
15	Consolidated Safety Services Incorporated Top agencies EPA (Environmental Protection Agency) DOI (Department of the Interior)	$4,476,031	1.8%	Rank history: #9 in FY2021, #14 in FY2022, #15 in FY2024 and #10 in FY2025; down 1 since FY2022.
16	Blue World Research Institute Inc. Top agencies DOI (Department of the Interior)	$4,188,887	1.7%	Rank history: #24 in FY2021, #72 in FY2022, #38 in FY2024 and #40 in FY2025; up 56 since FY2022.
17	Kgsne JV II LLC Top agencies EPA (Environmental Protection Agency)	$3,786,791	1.5%	Rank history: not on the FY2021 list, #10 in FY2022, #22 in FY2024 and #11 in FY2025; down 7 since FY2022.
18	Neptune and Company, Incorporated Top agencies DOE (Department of Energy)	$3,749,939	1.5%	Rank history: #61 in FY2021, #52 in FY2022, #28 in FY2024 and #13 in FY2025; up 34 since FY2022.
19	Ahtna, Incorporated Through Ahtna Global LLC Top agencies Army (Department of the Army)	$3,220,039	1.3%	Rank history: #17 in FY2021, #11 in FY2022, #91 in FY2024 and not on the FY2025 list; down 8 since FY2022.
20	Rmec Environmental Inc Top agencies Army (Department of the Army)	$3,214,552	1.3%	Rank history: not on the FY2021–FY2022 lists, #17 in FY2024 and #16 in FY2025; new.
21	Abraxas Energy Consulting LLC Top agencies DHS (Department of Homeland Security)	$2,699,535	1.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
22	Dawson Solutions LLC Top agencies DHS (Department of Homeland Security)	$2,568,823	1.0%	Rank history: not on the FY2021–FY2022 lists, #42 in FY2024 and #7 in FY2025; new.
23	Northland Research, Inc. Top agencies DHS (Department of Homeland Security)	$2,512,635	1.0%	Rank history: #33 in FY2021, #18 in FY2022, #27 in FY2024 and not on the FY2025 list; down 5 since FY2022.
24	Quaternary Resource Investigations, L.L.C. Top agencies GSA (General Services Administration) DOI (Department of the Interior)	$2,478,043	1.0%	Rank history: #91 in FY2021, #23 in FY2022, #43 in FY2024 and not on the FY2025 list; down 1 since FY2022.
25	Golder Europe Service Centre SRL 3 awardees, including WSP USA Solutions Inc., Ecology & Environment Inc. and WSP Italia S.R.L. Top agencies DOI (Department of the Interior) Army (Department of the Army)	$2,451,605	1.0%	Rank history: not on the FY2021–FY2022 lists, #18 in FY2024 and #14 in FY2025; new.
26	Aerostar Environmental and Construction LLC Top agencies Army (Department of the Army)	$2,404,851	1.0%	Rank history: not on the FY2021–FY2022 lists, #66 in FY2024 and not on the FY2025 list; new.
27	Ciri Development Corporation 2 awardees, including North Wind Site Services, LLC and North Wind Resource Consulting LLC Top agencies DOI (Department of the Interior) USDA (Department of Agriculture)	$2,271,854	0.9%	Rank history: not on the FY2021–FY2022 lists, not on the FY2024 list and #19 in FY2025; new.
28	Ardl Inc. Top agencies Army (Department of the Army) EPA (Environmental Protection Agency)	$2,109,750	0.9%	Rank history: not on the FY2021 list, #39 in FY2022, not on the FY2024 list and #32 in FY2025; up 11 since FY2022.
29	The Clark Group. Llc Top agencies USDA (Department of Agriculture) DOJ (Department of Justice)	$2,049,004	0.8%	Rank history: #28 in FY2021, #15 in FY2022, #9 in FY2024 and not on the FY2025 list; down 14 since FY2022.
30	Environmental Testing and Consulting, Inc. Top agencies Army (Department of the Army) DOI (Department of the Interior) DOJ (Department of Justice)	$2,023,582	0.8%	Rank history: not on the FY2021 list, #27 in FY2022, #30 in FY2024 and #21 in FY2025; down 3 since FY2022.
31	Hdr, Inc. 2 awardees, including HDR Environmental, Operations and Construction, Inc. Top agencies Navy (Department of the Navy)	$1,694,215	0.7%	Rank history: #83 in FY2021, #47 in FY2022, #4 in FY2024 and #4 in FY2025; up 16 since FY2022.
32	Anamar Environmental Consulting, Inc. Top agencies Army (Department of the Army)	$1,627,514	0.7%	Rank history: #18 in FY2021, #28 in FY2022, #33 in FY2024 and #18 in FY2025; down 4 since FY2022.
33	Cherokee Nation Environmental Solutions, L.L.C. Top agencies Army (Department of the Army)	$1,584,212	0.6%	Rank history: not on the FY2021–FY2022 lists, #51 in FY2024 and #62 in FY2025; new.
34	Arctic Slope Regional Corporation 2 awardees, including Environmental Quality Management, Inc. Top agencies Army (Department of the Army)	$1,541,885	0.6%	Rank history: #75 in FY2021, not on the FY2022 list and not on the FY2024–FY2025 lists; returned.
35	Avid Core LLC Top agencies DHS (Department of Homeland Security)	$1,497,773	0.6%	Rank history: not on the FY2021–FY2022 lists, #37 in FY2024 and #24 in FY2025; new.
36	Potomac-Hudson Engineering Inc Top agencies GSA (General Services Administration) DOS (Department of State) DHS (Department of Homeland Security)	$1,492,159	0.6%	Rank history: not on the FY2021–FY2022 lists, #20 in FY2024 and not on the FY2025 list; new.
37	Environmental Science Associates Top agencies VA (Department of Veterans Affairs) USDA (Department of Agriculture)	$1,453,086	0.6%	Rank history: not on the FY2021 list, #44 in FY2022 and not on the FY2024–FY2025 lists; up 7 since FY2022.
38	Land IQ, LLC Top agencies DOI (Department of the Interior)	$1,452,268	0.6%	Rank history: #19 in FY2021, #26 in FY2022 and not on the FY2024–FY2025 lists; down 12 since FY2022.
39	ERO Resources Corporation Top agencies USDA (Department of Agriculture) DOI (Department of the Interior) GSA (General Services Administration)	$1,395,525	0.6%	Rank history: not on the FY2021 list, #60 in FY2022, #46 in FY2024 and #64 in FY2025; up 21 since FY2022.
40	Horsley Witten Group, Inc. Top agencies EPA (Environmental Protection Agency)	$1,394,455	0.6%	Rank history: #12 in FY2021, #41 in FY2022, #32 in FY2024 and #38 in FY2025; up 1 since FY2022.
41	Gulf South Research Corp Top agencies DHS (Department of Homeland Security)	$1,390,002	0.6%	Rank history: not on the FY2021–FY2022 lists, not on the FY2024 list and #3 in FY2025; new.
42	GLE Associates, Inc. Top agencies Army (Department of the Army)	$1,387,135	0.6%	Rank history: #40 in FY2021, not on the FY2022 list, #65 in FY2024 and not on the FY2025 list; up 59 since FY2022.
43	Industrial Economics Inc. Top agencies DOI (Department of the Interior) DOE (Department of Energy) EPA (Environmental Protection Agency)	$1,373,518	0.6%	Rank history: #15 in FY2021, #32 in FY2022, #93 in FY2024 and not on the FY2025 list; down 11 since FY2022.
44	Swift River Versar JV Top agencies Navy (Department of the Navy)	$1,252,021	0.5%	Rank history: #45 in FY2021, #38 in FY2022, #24 in FY2024 and #81 in FY2025; down 6 since FY2022.
45	Cardinal Point Captains Inc Top agencies DOI (Department of the Interior)	$1,126,633	0.5%	Rank history: not on the FY2021–FY2022 lists, #90 in FY2024 and not on the FY2025 list; new.
46	Environmental Science Corporation Top agencies Army (Department of the Army)	$1,107,039	0.5%	Rank history: #36 in FY2021, #36 in FY2022, #62 in FY2024 and #25 in FY2025; down 10 since FY2022.
47	Marstel-Day, LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force) DOI (Department of the Interior)	$1,081,110	0.4%	Rank history: #88 in FY2021, #58 in FY2022, #77 in FY2024 and #49 in FY2025; up 11 since FY2022.
48	Southeastern Archaeological Research Inc. Top agencies Army (Department of the Army)	$1,050,485	0.4%	Rank history: #23 in FY2021, #35 in FY2022, #54 in FY2024 and #15 in FY2025; down 13 since FY2022.
49	LG2 Environmental Solutions, Inc. Top agencies Army (Department of the Army)	$1,048,067	0.4%	Rank history: #20 in FY2021, #57 in FY2022, #69 in FY2024 and #27 in FY2025; up 8 since FY2022.
50	Converge Federal Solutions JV, LLC Top agencies Army (Department of the Army)	$1,017,513	0.4%	Rank history: not on the FY2021–FY2022 lists, #49 in FY2024 and #43 in FY2025; new.
51	Ceg-Mse 8A JV, LLC Top agencies DHS (Department of Homeland Security)	$945,862	0.4%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 160 since FY2022.
52	Environmental Solutions & Innovations, Inc. Top agencies USDA (Department of Agriculture)	$901,734	0.4%	Rank history: #79 in FY2021, #70 in FY2022, #56 in FY2024 and not on the FY2025 list; up 18 since FY2022.
53	Ohio Valley Archaeology, Inc. Top agencies Navy (Department of the Navy)	$871,082	0.4%	Rank history: not on the FY2021–FY2022 lists, #100 in FY2024 and not on the FY2025 list; new.
54	UIC Government Services LLC Through Bowhead Total Enterprise Solutions, LLC Top agencies Army (Department of the Army)	$786,666	0.3%	Rank history: not on the FY2021 list, #34 in FY2022 and not on the FY2024–FY2025 lists; down 20 since FY2022.
55	Recon Environmental,Inc. Top agencies DHS (Department of Homeland Security)	$782,643	0.3%	Rank history: #46 in FY2021, #24 in FY2022, #14 in FY2024 and not on the FY2025 list; down 31 since FY2022.
56	The NDN Sundance JV LLC Top agencies Army (Department of the Army)	$765,442	0.3%	Rank history: #62 in FY2021, #21 in FY2022, #58 in FY2024 and not on the FY2025 list; down 35 since FY2022.
57	Pact, Inc. Top agencies USAID (US Agency for International Development)	$750,000	0.3%	Rank history: #4 in FY2021, #17 in FY2022 and not on the FY2024–FY2025 lists; down 40 since FY2022.
58	Ross & Associates Environmental Consulting, Ltd. Top agencies EPA (Environmental Protection Agency)	$744,825	0.3%	Rank history: not on the FY2021–FY2022 lists, #47 in FY2024 and not on the FY2025 list; up 115 since FY2022.
59	Native Hawaiian Community Development Corporation Through GSI North America Inc. Top agencies Army (Department of the Army)	$700,000	0.3%	Rank history: not on the FY2021 list, #53 in FY2022 and not on the FY2024–FY2025 lists; down 6 since FY2022.
60	EA Engineering, Science, and Technology, Inc., PBC Top agencies EPA (Environmental Protection Agency) USAF (Department of the Air Force) DOT (Department of Transportation)	$678,587	0.3%	Rank history: #13 in FY2021, #20 in FY2022 and not on the FY2024–FY2025 lists; down 40 since FY2022.
61	Solv LLC Top agencies GSA (General Services Administration)	$651,416	0.3%	Rank history: not on the FY2021–FY2022 lists, not on the FY2024 list and #85 in FY2025; up 70 since FY2022.
62	Wood Environment & Infrastructure Solutions Inc. 2 awardees, including WSP USA Environment & Infrastructure Inc. Top agencies EPA (Environmental Protection Agency) DOI (Department of the Interior) DHS (Department of Homeland Security)	$630,451	0.3%	Rank history: #32 in FY2021, #37 in FY2022 and not on the FY2024–FY2025 lists; down 25 since FY2022.
63	Copperhead Environmental Consulting Inc. Top agencies USDA (Department of Agriculture) DOT (Department of Transportation)	$611,926	0.2%	Rank history: not on the FY2021 list, #66 in FY2022, #97 in FY2024 and not on the FY2025 list; up 3 since FY2022.
64	Cogstone Resource Management Top agencies DOI (Department of the Interior)	$576,042	0.2%	Rank history: #27 in FY2021, not on the FY2022 list and not on the FY2024–FY2025 lists; returned.
65	Global Consulting Inc. Top agencies HHS (Department of Health and Human Services)	$533,803	0.2%	Rank history: #67 in FY2021, #73 in FY2022, #53 in FY2024 and #41 in FY2025; up 8 since FY2022.
66	Johnson, Mirmiran & Thompson, Inc. Top agencies GSA (General Services Administration)	$524,615	0.2%	Rank history: not on the FY2021–FY2022 lists, #78 in FY2024 and #86 in FY2025; new.
67	MBK Engineers Top agencies DOI (Department of the Interior)	$500,000	0.2%	Rank history: #58 in FY2021, #69 in FY2022, #13 in FY2024 and #53 in FY2025; up 2 since FY2022.
68	RPS Group Inc. Top agencies DOI (Department of the Interior)	$479,212	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
69	Olshesky Design Group LLC Top agencies HHS (Department of Health and Human Services)	$469,194	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
70	ST George Tanaq Corp Through Heliotech Top agencies EPA (Environmental Protection Agency)	$442,526	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
71	Aarcher Inc Top agencies DOI (Department of the Interior) DOJ (Department of Justice)	$430,772	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
72	Bb&E, Inc. Top agencies DOI (Department of the Interior)	$417,203	0.2%	Rank history: not on the FY2021 list, #51 in FY2022 and not on the FY2024–FY2025 lists; down 21 since FY2022.
73	Bluestone Environmental Group, Inc. Top agencies Army (Department of the Army) USDA (Department of Agriculture)	$413,719	0.2%	Rank history: not on the FY2021 list, #83 in FY2022, not on the FY2024 list and #67 in FY2025; up 10 since FY2022.
74	Northwest Management Inc Top agencies DOI (Department of the Interior)	$381,521	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
75	President and Fellows of Middlebury College Top agencies DOS (Department of State)	$378,858	0.2%	Rank history: not on the FY2021 list, #75 in FY2022 and not on the FY2024–FY2025 lists; unchanged since FY2022.
76	Agralytica, Inc. Top agencies USDA (Department of Agriculture)	$371,581	0.2%	Rank history: not on the FY2021 list, #80 in FY2022 and not on the FY2024–FY2025 lists; up 4 since FY2022.
77	State of Arizona Through University of Arizona Top agencies HHS (Department of Health and Human Services)	$365,821	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
78	Shekar Engineering, P.l.c Top agencies DLA (Defense Logistics Agency)	$361,089	0.1%	Rank history: #55 in FY2021, not on the FY2022 list, #98 in FY2024 and not on the FY2025 list; returned.
79	Asir LLC Top agencies DOI (Department of the Interior)	$355,296	0.1%	Rank history: #82 in FY2021, #78 in FY2022 and not on the FY2024–FY2025 lists; down 1 since FY2022.
80	Bratslavsky Consulting Engineers, Inc. Top agencies USDA (Department of Agriculture)	$347,436	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
81	Cornell University Top agencies HUD (Department of Housing and Urban Development)	$341,372	0.1%	Rank history: not on the FY2021 list, #77 in FY2022 and not on the FY2024–FY2025 lists; down 4 since FY2022.
82	Arcgeo Inc. Top agencies Army (Department of the Army)	$328,896	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
83	The Verification Research Training and Information Centre (Vertic) Top agencies DOS (Department of State)	$311,072	0.1%	Rank history: #97 in FY2021, #46 in FY2022 and not on the FY2024–FY2025 lists; down 37 since FY2022.
84	Adanta Inc. Top agencies Navy (Department of the Navy) DOI (Department of the Interior)	$305,566	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
85	Booz Allen Hamilton Holding Corporation Through Booz Allen Hamilton Inc. Top agencies DOI (Department of the Interior)	$304,469	0.1%	Rank history: not on the FY2021 list, #96 in FY2022 and not on the FY2024–FY2025 lists; up 11 since FY2022.
86	University of Texas System Through The University of Texas RIO Grande Valley Top agencies DOI (Department of the Interior)	$300,000	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
87	ECO Analysts, LLC Top agencies Army (Department of the Army)	$289,558	0.1%	Rank history: not on the FY2021 list, #81 in FY2022 and not on the FY2024–FY2025 lists; down 6 since FY2022.
88	Panamerican Consultants Inc. Top agencies Army (Department of the Army)	$285,306	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
89	State of Florida Through Florida Department of Environmental Protection Top agencies NASA (National Aeronautics and Space Administration)	$276,808	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
90	Avanti Corporation Top agencies DOI (Department of the Interior)	$274,679	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
91	Sage-Efs JV Top agencies USDA (Department of Agriculture)	$274,250	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
92	Eustis Engineering, L.L.C. Top agencies Army (Department of the Army)	$270,511	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
93	Toeroek Associates, Inc. Top agencies EPA (Environmental Protection Agency) USDA (Department of Agriculture)	$266,255	0.1%	Rank history: not on the FY2021 list, #100 in FY2022, #86 in FY2024 and not on the FY2025 list; up 7 since FY2022.
94	Ecoquants LLC Top agencies DOI (Department of the Interior)	$265,000	0.1%	Rank history: not on the FY2021–FY2022 lists, not on the FY2024 list and #56 in FY2025; new.
95	Cornerstone Environmental Consulting LLC Top agencies DOI (Department of the Interior) USDA (Department of Agriculture)	$263,116	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
96	WSP USA Environment & Infrastructure Inc. Top agencies EPA (Environmental Protection Agency)	$249,975	0.1%	Rank history: not on the FY2021–FY2022 lists, not on the FY2024 list and #95 in FY2025; up 172 since FY2022.
97	Pinyon Environmental, Inc. Top agencies USDA (Department of Agriculture) USAF (Department of the Air Force)	$249,414	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 116 since FY2022.
98	Espinoza Cultural Services LLC Top agencies DOI (Department of the Interior) DOE (Department of Energy)	$238,797	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
99	Aurora Industrial Hygiene Top agencies VA (Department of Veterans Affairs)	$236,980	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
100	Water & Air Research, Inc. Top agencies Army (Department of the Army)	$236,096	0.1%	Rank history: #59 in FY2021, #88 in FY2022, #71 in FY2024 and #58 in FY2025; down 12 since FY2022.

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100 of 334 contractors listed here. See the rest on GovTribe.

How this ranking works

Source: every contract action FPDS records (as published on SAM.gov) in the period, as GovTribe received it.
Amounts are net obligations: what was obligated, less what was deobligated. Shares are of $245 million 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 2023 ran Oct 1, 2022 – Sep 30, 2023. 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 FY2022. "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 FY2022 takes the color of the rank change beside it.
Placeholder recipients FPDS uses when it names no company ("Miscellaneous Foreign Contractors" and the like) aren't ranked.

Quick answers

Who were the top 10 PSC B510 contractors in FY2023?

1. Tetra Tech, Inc. ($19.3M), 2. Environmental Management & Planning Solutions LLC ($16.4M), 3. AECOM ($15.4M), 4. Pe Ayuda Joint Venture LLC ($10.1M), 5. Swca Incorporated ($9.75M), 6. Leidos Holdings, Inc. ($8.33M), 7. Pb&A / CSS JV, Llc. ($6.59M), 8. ICF International, Inc. ($6.05M), 9. Jacobs Engineering Group Inc. ($5.71M), 10. The Texas A&M University System ($5.15M).

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