Top 100 Contractors in PSC B510: Environmental Studies and Assessments, FY2024

Name: Top 100 Contractors in PSC B510: Environmental Studies and Assessments, FY2024
Creator: GovTribe

Parent companies by net contract obligations Oct 1, 2023 – Sep 30, 2024 Code page on GovTribe

The top 10 won 46% of FY2024 PSC B510 contract dollars

Contract obligations: $248,912,878 Net of deobligations, by contracts coded PSC B510
Contractors: 347 Parent companies with an obligation
Largest contractor: Minatoishi Palumbo Architects, Inc. $28.7 million, 10.5% 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	Minatoishi Palumbo Architects, Inc. Top agencies Army (Department of the Army)	$28,712,217	10.5%	Rank history: not on the FY2021–FY2023 lists and #74 in FY2025; new.
2	Kemron Environmental Services Inc. Top agencies Army (Department of the Army)	$22,358,851	8.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
3	Tetra Tech, Inc. 5 awardees, including RPS Group, Inc. Top agencies EPA (Environmental Protection Agency) DOI (Department of the Interior)	$15,664,077	5.7%	Rank history: #7 in FY2021, #2 in FY2022, #1 in FY2023 and #2 in FY2025; down 2 since FY2023.
4	Hdr, Inc. 2 awardees, including HDR Environmental, Operations and Construction, Inc. and HDR Engineering Inc. Top agencies Navy (Department of the Navy) DOI (Department of the Interior)	$13,846,772	5.1%	Rank history: #83 in FY2021, #47 in FY2022, #31 in FY2023 and #4 in FY2025; up 27 since FY2023.
5	AECOM Technical Services, Inc. Top agencies DHS (Department of Homeland Security) DOI (Department of the Interior)	$10,927,759	4.0%	Rank history: not on the FY2021–FY2023 lists and #54 in FY2025; new.
6	Tellus Civic Science Corporation Top agencies Commerce (Department of Commerce)	$9,419,785	3.5%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
7	Eastern Research Group Inc. Top agencies EPA (Environmental Protection Agency) DOI (Department of the Interior)	$7,085,940	2.6%	Rank history: #2 in FY2021, #12 in FY2022, #13 in FY2023 and #6 in FY2025; up 6 since FY2023.
8	Tridec Technologies, LLC Top agencies Commerce (Department of Commerce)	$6,287,619	2.3%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
9	The Clark Group. Llc Top agencies USDA (Department of Agriculture) DOJ (Department of Justice)	$5,961,051	2.2%	Rank history: #28 in FY2021, #15 in FY2022, #29 in FY2023 and not on the FY2025 list; up 20 since FY2023.
10	Jacobs Government Services Company Through Jacobs Engineering Group Inc. Top agencies Army (Department of the Army)	$5,645,900	2.1%	Rank history: not on the FY2021–FY2023 lists and #8 in FY2025; new.
11	Leidos, Inc. Top agencies HUD (Department of Housing and Urban Development)	$4,882,069	1.8%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
12	AECOM 4 awardees, including Environmental Management & Planning Solutions LLC and AECOM Italia S.P.A. Top agencies DOI (Department of the Interior) USDA (Department of Agriculture)	$4,614,991	1.7%	Rank history: #22 in FY2021, #5 in FY2022, #3 in FY2023 and #30 in FY2025; down 9 since FY2023.
13	MBK Engineers Top agencies DOI (Department of the Interior)	$4,361,417	1.6%	Rank history: #58 in FY2021, #69 in FY2022, #67 in FY2023 and #53 in FY2025; up 54 since FY2023.
14	Recon Environmental,Inc. Top agencies DHS (Department of Homeland Security)	$4,321,657	1.6%	Rank history: #46 in FY2021, #24 in FY2022, #55 in FY2023 and not on the FY2025 list; up 41 since FY2023.
15	Consolidated Safety Services Incorporated Top agencies EPA (Environmental Protection Agency) DOI (Department of the Interior)	$4,290,261	1.6%	Rank history: #9 in FY2021, #14 in FY2022, #15 in FY2023 and #10 in FY2025; unchanged since FY2023.
16	Couvillion Group LLC Top agencies DOI (Department of the Interior)	$4,056,191	1.5%	Rank history: not on the FY2021 list, #1 in FY2022, not on the FY2023 list and not on the FY2025 list; returned.
17	Rmec Environmental Inc Top agencies Army (Department of the Army)	$3,470,089	1.3%	Rank history: not on the FY2021–FY2022 lists, #20 in FY2023 and #16 in FY2025; up 3 since FY2023.
18	Golder Europe Service Centre SRL 2 awardees, including WSP USA Solutions Inc. and WSP Italia S.R.L. Top agencies DOI (Department of the Interior) DOE (Department of Energy) Army (Department of the Army)	$3,200,888	1.2%	Rank history: not on the FY2021–FY2022 lists, #25 in FY2023 and #14 in FY2025; up 7 since FY2023.
19	Amentum Services, Inc. Top agencies Army (Department of the Army)	$3,000,000	1.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
20	Potomac-Hudson Engineering Inc Top agencies DOE (Department of Energy) GSA (General Services Administration) DOS (Department of State)	$2,994,889	1.1%	Rank history: not on the FY2021–FY2022 lists, #36 in FY2023 and not on the FY2025 list; up 16 since FY2023.
21	WSP USA Solutions Inc. Top agencies DOE (Department of Energy) GSA (General Services Administration) DOI (Department of the Interior)	$2,816,678	1.0%	Rank history: #8 in FY2021, #8 in FY2022, #14 in FY2023 and not on the FY2025 list; down 7 since FY2023.
22	Kgsne JV II LLC Top agencies EPA (Environmental Protection Agency)	$2,678,143	1.0%	Rank history: not on the FY2021 list, #10 in FY2022, #17 in FY2023 and #11 in FY2025; down 5 since FY2023.
23	University of California, Davis Top agencies EPA (Environmental Protection Agency)	$2,665,103	1.0%	Rank history: not on the FY2021–FY2023 lists and #9 in FY2025; new.
24	Swift River Versar JV Top agencies Navy (Department of the Navy)	$2,549,037	0.9%	Rank history: #45 in FY2021, #38 in FY2022, #44 in FY2023 and #81 in FY2025; up 20 since FY2023.
25	State of California Controllers Office Through University of California, Davis Top agencies EPA (Environmental Protection Agency)	$2,523,662	0.9%	Rank history: #10 in FY2021, #19 in FY2022, #11 in FY2023 and not on the FY2025 list; down 14 since FY2023.
26	ICF International, Inc. Through ICF Incorporated, L.L.C. Top agencies USDA (Department of Agriculture) DOI (Department of the Interior)	$2,463,473	0.9%	Rank history: #5 in FY2021, #3 in FY2022, #8 in FY2023 and not on the FY2025 list; down 18 since FY2023.
27	Northland Research, Inc. Top agencies DHS (Department of Homeland Security)	$2,434,471	0.9%	Rank history: #33 in FY2021, #18 in FY2022, #23 in FY2023 and not on the FY2025 list; down 4 since FY2023.
28	Neptune and Company, Incorporated Top agencies DOE (Department of Energy)	$2,261,727	0.8%	Rank history: #61 in FY2021, #52 in FY2022, #18 in FY2023 and #13 in FY2025; down 10 since FY2023.
29	Swca Incorporated Top agencies DOI (Department of the Interior)	$2,124,589	0.8%	Rank history: not on the FY2021–FY2023 lists and #57 in FY2025; new.
30	Environmental Testing and Consulting, Inc. Top agencies Army (Department of the Army)	$1,927,562	0.7%	Rank history: not on the FY2021 list, #27 in FY2022, #30 in FY2023 and #21 in FY2025; unchanged since FY2023.
31	Stantec Inc. Through Stantec Consulting Services Inc. Top agencies HHS (Department of Health and Human Services) DOI (Department of the Interior)	$1,673,925	0.6%	Rank history: not on the FY2021–FY2022 lists, #12 in FY2023 and #20 in FY2025; down 19 since FY2023.
32	Horsley Witten Group, Inc. Top agencies EPA (Environmental Protection Agency)	$1,663,178	0.6%	Rank history: #12 in FY2021, #41 in FY2022, #40 in FY2023 and #38 in FY2025; up 8 since FY2023.
33	Anamar Environmental Consulting, Inc. Top agencies Army (Department of the Army)	$1,617,094	0.6%	Rank history: #18 in FY2021, #28 in FY2022, #32 in FY2023 and #18 in FY2025; down 1 since FY2023.
34	EA Engineering Science and Technology Inc. PBC Top agencies DOI (Department of the Interior) EPA (Environmental Protection Agency) Navy (Department of the Navy)	$1,615,077	0.6%	Rank history: not on the FY2021–FY2023 lists and #35 in FY2025; new.
35	S C & A Inc. Top agencies DOE (Department of Energy) EPA (Environmental Protection Agency)	$1,543,250	0.6%	Rank history: #54 in FY2021, not on the FY2022–FY2023 lists and #36 in FY2025; up 120 since FY2023.
36	Amentum Holdings, Inc. Through Amentum Services, Inc. Top agencies Army (Department of the Army)	$1,529,247	0.6%	Rank history: not on the FY2021–FY2023 lists and #1 in FY2025; new.
37	Avid Core LLC Top agencies DHS (Department of Homeland Security)	$1,514,203	0.6%	Rank history: not on the FY2021–FY2022 lists, #35 in FY2023 and #24 in FY2025; down 2 since FY2023.
38	Blue World Research Institute Inc. Top agencies DOI (Department of the Interior)	$1,477,512	0.5%	Rank history: #24 in FY2021, #72 in FY2022, #16 in FY2023 and #40 in FY2025; down 22 since FY2023.
39	Pinyon Environmental Inc. Top agencies USDA (Department of Agriculture) DOI (Department of the Interior)	$1,436,323	0.5%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
40	Pb&A / CSS JV, Llc. Top agencies EPA (Environmental Protection Agency)	$1,383,234	0.5%	Rank history: not on the FY2021 list, #6 in FY2022, #7 in FY2023 and not on the FY2025 list; down 33 since FY2023.
41	The Rand Corporation Top agencies DHS (Department of Homeland Security)	$1,257,638	0.5%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
42	Dawson Solutions LLC Top agencies DHS (Department of Homeland Security) USDA (Department of Agriculture)	$1,252,234	0.5%	Rank history: not on the FY2021–FY2022 lists, #22 in FY2023 and #7 in FY2025; down 20 since FY2023.
43	Quaternary Resource Investigations, L.L.C. Top agencies GSA (General Services Administration)	$1,230,787	0.5%	Rank history: #91 in FY2021, #23 in FY2022, #24 in FY2023 and not on the FY2025 list; down 19 since FY2023.
44	Stantec Consulting Services Inc. Top agencies DOI (Department of the Interior) HHS (Department of Health and Human Services)	$1,226,629	0.4%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
45	Semanticbits LLC Through ICF Incorporated, L.L.C. Top agencies DOI (Department of the Interior) DOT (Department of Transportation) USDA (Department of Agriculture)	$1,225,615	0.4%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
46	ERO Resources Corporation Top agencies DOI (Department of the Interior) USDA (Department of Agriculture)	$1,200,063	0.4%	Rank history: not on the FY2021 list, #60 in FY2022, #39 in FY2023 and #64 in FY2025; down 7 since FY2023.
47	Ross & Associates Environmental Consulting, Ltd. Top agencies EPA (Environmental Protection Agency)	$1,186,386	0.4%	Rank history: not on the FY2021–FY2022 lists, #58 in FY2023 and not on the FY2025 list; up 11 since FY2023.
48	Truescape Limited Top agencies DOI (Department of the Interior)	$1,130,025	0.4%	Rank history: not on the FY2021 list, #43 in FY2022, not on the FY2023 list and #51 in FY2025; returned.
49	Converge Federal Solutions JV, LLC Top agencies Army (Department of the Army)	$1,075,307	0.4%	Rank history: not on the FY2021–FY2022 lists, #50 in FY2023 and #43 in FY2025; up 1 since FY2023.
50	First Environment Inc. Top agencies VA (Department of Veterans Affairs)	$1,070,342	0.4%	Rank history: not on the FY2021 list, #84 in FY2022, not on the FY2023 list and not on the FY2025 list; up 104 since FY2023.
51	Cherokee Nation Environmental Solutions, L.L.C. Top agencies Army (Department of the Army)	$1,049,266	0.4%	Rank history: not on the FY2021–FY2022 lists, #33 in FY2023 and #62 in FY2025; down 18 since FY2023.
52	Ethosenergy Light Turbines LLC Through WSP USA Environment & Infrastructure Inc. Top agencies DHS (Department of Homeland Security)	$926,600	0.3%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
53	Global Consulting Inc. Top agencies HHS (Department of Health and Human Services)	$912,720	0.3%	Rank history: #67 in FY2021, #73 in FY2022, #65 in FY2023 and #41 in FY2025; up 12 since FY2023.
54	Southeastern Archaeological Research Inc. Top agencies Army (Department of the Army)	$911,688	0.3%	Rank history: #23 in FY2021, #35 in FY2022, #48 in FY2023 and #15 in FY2025; down 6 since FY2023.
55	Mabbett & Associates, Inc. Top agencies VA (Department of Veterans Affairs) EPA (Environmental Protection Agency) USDA (Department of Agriculture)	$866,548	0.3%	Rank history: #39 in FY2021, #33 in FY2022, not on the FY2023 list and #59 in FY2025; up 109 since FY2023.
56	Environmental Solutions & Innovations, Inc. Top agencies USDA (Department of Agriculture) Army (Department of the Army)	$850,925	0.3%	Rank history: #79 in FY2021, #70 in FY2022, #52 in FY2023 and not on the FY2025 list; down 4 since FY2023.
57	True Wind Collaborative LLC Top agencies USDA (Department of Agriculture) Morris K. Udall Foundation	$803,070	0.3%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
58	The NDN Sundance JV LLC Top agencies Army (Department of the Army)	$774,404	0.3%	Rank history: #62 in FY2021, #21 in FY2022, #56 in FY2023 and not on the FY2025 list; down 2 since FY2023.
59	Hydrogeologic, Inc. Top agencies EPA (Environmental Protection Agency)	$763,753	0.3%	Rank history: not on the FY2021–FY2023 lists and #50 in FY2025; up 63 since FY2023.
60	Hamer Environmental Limited Partnership Top agencies DOI (Department of the Interior)	$753,999	0.3%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
61	Seres Engineering & Services LLC Top agencies USAF (Department of the Air Force)	$700,765	0.3%	Rank history: not on the FY2021 list, #55 in FY2022, not on the FY2023 list and not on the FY2025 list; up 141 since FY2023.
62	Environmental Science Corporation Top agencies Army (Department of the Army)	$696,921	0.3%	Rank history: #36 in FY2021, #36 in FY2022, #46 in FY2023 and #25 in FY2025; down 16 since FY2023.
63	Mill Creek Firelake JV LLC Top agencies USDA (Department of Agriculture)	$689,732	0.3%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
64	Terra Mar Applied Sciences, LLC Top agencies DOI (Department of the Interior)	$684,500	0.3%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
65	GLE Associates, Inc. Top agencies Army (Department of the Army)	$667,472	0.2%	Rank history: #40 in FY2021, not on the FY2022 list, #42 in FY2023 and not on the FY2025 list; down 23 since FY2023.
66	Aerostar Environmental and Construction LLC Top agencies Army (Department of the Army)	$657,387	0.2%	Rank history: not on the FY2021–FY2022 lists, #26 in FY2023 and not on the FY2025 list; down 40 since FY2023.
67	Geostabilization International, LLC Top agencies USDA (Department of Agriculture)	$633,200	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
68	Aarcher, Inc. Top agencies DOI (Department of the Interior)	$622,654	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
69	LG2 Environmental Solutions, Inc. Top agencies Army (Department of the Army)	$596,546	0.2%	Rank history: #20 in FY2021, #57 in FY2022, #49 in FY2023 and #27 in FY2025; down 20 since FY2023.
70	Environmental Management and Planning Solutions Inc. Top agencies DOI (Department of the Interior)	$583,936	0.2%	Rank history: #3 in FY2021, #4 in FY2022, #2 in FY2023 and not on the FY2025 list; down 68 since FY2023.
71	Water & Air Research, Inc. Top agencies Army (Department of the Army)	$582,432	0.2%	Rank history: #59 in FY2021, #88 in FY2022, #100 in FY2023 and #58 in FY2025; up 29 since FY2023.
72	Ironwood Consulting Inc. Top agencies DOI (Department of the Interior)	$566,304	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
73	Ahtna Global LLC Top agencies Army (Department of the Army)	$563,159	0.2%	Rank history: not on the FY2021–FY2023 lists and #42 in FY2025; new.
74	ASM Affiliates Inc. Top agencies DOI (Department of the Interior) AOUSC (Administrative Office of the U.S. Courts)	$553,549	0.2%	Rank history: not on the FY2021 list, #63 in FY2022, not on the FY2023 list and not on the FY2025 list; up 86 since FY2023.
75	Chloeta Holdings LLC Top agencies USDA (Department of Agriculture) DOI (Department of the Interior)	$521,900	0.2%	Rank history: not on the FY2021–FY2023 lists and #44 in FY2025; new.
76	Ocean Associates Inc. Top agencies Commerce (Department of Commerce)	$516,460	0.2%	Rank history: not on the FY2021–FY2023 lists and #48 in FY2025; new.
77	Marstel-Day, LLC Top agencies USAF (Department of the Air Force) DOI (Department of the Interior)	$487,736	0.2%	Rank history: #88 in FY2021, #58 in FY2022, #47 in FY2023 and #49 in FY2025; down 30 since FY2023.
78	Johnson, Mirmiran & Thompson, Inc. Top agencies GSA (General Services Administration)	$486,085	0.2%	Rank history: not on the FY2021–FY2022 lists, #66 in FY2023 and #86 in FY2025; down 12 since FY2023.
79	OYO Corporation, Pacific Top agencies Army (Department of the Army)	$468,359	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; up 71 since FY2023.
80	Sundance Consultants, LLC Top agencies DOI (Department of the Interior)	$465,204	0.2%	Rank history: not on the FY2021 list, #30 in FY2022, not on the FY2023 list and not on the FY2025 list; up 31 since FY2023.
81	Dewberry Engineers Inc. Top agencies DOI (Department of the Interior)	$464,578	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
82	LRS Federal LLC Top agencies VA (Department of Veterans Affairs)	$457,385	0.2%	Rank history: not on the FY2021–FY2023 lists and #23 in FY2025; new.
83	NA Aikane O Maui, Inc. Top agencies EPA (Environmental Protection Agency)	$449,100	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
84	National Institute of Building Sciences Top agencies EPA (Environmental Protection Agency)	$440,470	0.2%	Rank history: not on the FY2021–FY2023 lists and #52 in FY2025; new.
85	Environmental Cost Management, Inc. Top agencies DOI (Department of the Interior)	$420,882	0.2%	Rank history: not on the FY2021 list, #97 in FY2022, not on the FY2023 list and #73 in FY2025; up 17 since FY2023.
86	Toeroek Associates, Inc. Top agencies EPA (Environmental Protection Agency) USDA (Department of Agriculture)	$415,900	0.2%	Rank history: not on the FY2021 list, #100 in FY2022, #93 in FY2023 and not on the FY2025 list; up 7 since FY2023.
87	Tilson Technology Management Inc. Top agencies DOI (Department of the Interior)	$410,730	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
88	Olshesky Design Group, LLC Top agencies HHS (Department of Health and Human Services)	$401,790	0.1%	Rank history: not on the FY2021–FY2023 lists and #100 in FY2025; new.
89	Watercourse Engineering, Inc. Top agencies DOI (Department of the Interior)	$400,000	0.1%	Rank history: not on the FY2021–FY2023 lists and #47 in FY2025; new.
90	Cardinal Point Captains Inc Top agencies DOI (Department of the Interior)	$399,754	0.1%	Rank history: not on the FY2021–FY2022 lists, #45 in FY2023 and not on the FY2025 list; down 45 since FY2023.
91	Ahtna, Incorporated Through Ahtna Global LLC Top agencies Army (Department of the Army)	$372,269	0.1%	Rank history: #17 in FY2021, #11 in FY2022, #19 in FY2023 and not on the FY2025 list; down 72 since FY2023.
92	Ami Consulting Engineers, P.a. Top agencies DOS (Department of State)	$372,000	0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
93	Industrial Economics Inc. Top agencies EPA (Environmental Protection Agency)	$348,694	0.1%	Rank history: #15 in FY2021, #32 in FY2022, #43 in FY2023 and not on the FY2025 list; down 50 since FY2023.
94	Paleowest LLC Top agencies Army (Department of the Army)	$348,606	0.1%	Rank history: #99 in FY2021, not on the FY2022–FY2023 lists and #37 in FY2025; up 38 since FY2023.
95	Agralytica Inc. Top agencies USDA (Department of Agriculture)	$345,081	0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
96	Advanced Resource Solutions, Inc. Top agencies DOI (Department of the Interior)	$338,955	0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
97	Copperhead Environmental Consulting Inc. Top agencies USDA (Department of Agriculture) DOT (Department of Transportation)	$331,113	0.1%	Rank history: not on the FY2021 list, #66 in FY2022, #63 in FY2023 and not on the FY2025 list; down 34 since FY2023.
98	Shekar Engineering, P.l.c Top agencies DLA (Defense Logistics Agency)	$328,701	0.1%	Rank history: #55 in FY2021, not on the FY2022 list, #78 in FY2023 and not on the FY2025 list; down 20 since FY2023.
99	Biovigil Technologies LLC Top agencies VA (Department of Veterans Affairs)	$327,250	0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
100	Ohio Valley Archaeology, Inc. Top agencies Navy (Department of the Navy)	$322,403	0.1%	Rank history: not on the FY2021–FY2022 lists, #53 in FY2023 and not on the FY2025 list; down 47 since FY2023.

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100 of 347 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 $273 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 2024 ran Oct 1, 2023 – Sep 30, 2024. 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 FY2023. "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 FY2023 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 FY2024?

1. Minatoishi Palumbo Architects, Inc. ($28.7M), 2. Kemron Environmental Services Inc. ($22.4M), 3. Tetra Tech, Inc. ($15.7M), 4. Hdr, Inc. ($13.8M), 5. AECOM Technical Services, Inc. ($10.9M), 6. Tellus Civic Science Corporation ($9.42M), 7. Eastern Research Group Inc. ($7.09M), 8. Tridec Technologies, LLC ($6.29M), 9. The Clark Group. Llc ($5.96M), 10. Jacobs Government Services Company ($5.65M).

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