Top 100 Contractors in PSC AH: Natural Resources and Environment R&D Services, Jul 2025–Jun 2026

Name: Top 100 Contractors in PSC AH: Natural Resources and Environment R&D Services, Jul 2025–Jun 2026
Creator: GovTribe

Parent companies by net contract obligations Jul 1, 2025 – Jun 30, 2026 Code page on GovTribe

The top 10 won 88% of PSC AH contract dollars from July 2025 through June 2026

Contract obligations: $187,589,453 Net of deobligations, by contracts coded PSC AH or a code under it
Contractors: 129 Parent companies with an obligation
Largest contractor: RTX Corporation $134 million, 70.7% of obligations
Data as of: Oct 14, 2026

Contract actions from FPDS (SAM.gov). How the rankings work · Download all 100 rows as CSV

Full ranking

Rank	Contractor	Net obligations	Share	Trend
1	RTX Corporation 2 awardees, including Raytheon Company Top agencies NASA (National Aeronautics and Space Administration)	$133,800,000	70.7%	Rank history: #57 in FY2021, #91 in FY2022, not on the FY2023 list, #1 in FY2024 and #1 in FY2025; unchanged since Jul 2024–Jun 2025.
2	University Corporation for Atmospheric Research Top agencies Commerce (Department of Commerce)	$13,062,626	6.9%	Rank history: #98 in FY2021, #6 in FY2022, #16 in FY2023, #3 in FY2024 and #2 in FY2025; up 1 since Jul 2024–Jun 2025.
3	University of Wisconsin System Top agencies NASA (National Aeronautics and Space Administration)	$4,245,334	2.2%	Rank history: not on the FY2021–FY2024 lists and #4 in FY2025; new, not ranked in Jul 2024–Jun 2025.
4	M2 Strategy Inc. Top agencies Commerce (Department of Commerce)	$3,415,288	1.8%	Rank history: not on the FY2021–FY2023 lists, #26 in FY2024 and #15 in FY2025; up 20 since Jul 2024–Jun 2025.
5	Board of Regents of Nevada System of Higher Education Top agencies Army (Department of the Army)	$2,999,612	1.6%	Rank history: not on the FY2021–FY2024 lists and #6 in FY2025; new, not ranked in Jul 2024–Jun 2025.
6	Credere Associates, LLC Top agencies Army (Department of the Army)	$2,281,236	1.2%	Rank history: #21 in FY2021, #26 in FY2022, #6 in FY2023, #22 in FY2024 and #3 in FY2025; unchanged since Jul 2024–Jun 2025.
7	Specpro Sustainment and Environmental, LLC Top agencies EPA (Environmental Protection Agency)	$2,195,978	1.2%	Rank history: not on the FY2021–FY2024 lists and #19 in FY2025; up 106 since Jul 2024–Jun 2025.
8	Virginia Department of Wildlife Resources Top agencies NASA (National Aeronautics and Space Administration)	$1,683,205	0.9%	Rank history: not on the FY2021–FY2024 lists and #12 in FY2025; new, not ranked in Jul 2024–Jun 2025.
9	S.l. Ross Environmental Research Limited Top agencies DOI (Department of the Interior)	$1,372,517	0.7%	Rank history: not on the FY2021 list, #19 in FY2022, not on the FY2023–FY2024 lists and #16 in FY2025; up 95 since Jul 2024–Jun 2025.
10	University of California Santa Cruz Top agencies Navy (Department of the Navy)	$1,043,275	0.6%	Rank history: not on the FY2021–FY2023 lists, #75 in FY2024 and #26 in FY2025; up 29 since Jul 2024–Jun 2025.
11	Environmental Assessment Services, LLC Top agencies Army (Department of the Army)	$892,523	0.5%	Rank history: not on the FY2021–FY2023 lists, #85 in FY2024 and #30 in FY2025; up 25 since Jul 2024–Jun 2025.
12	Creare LLC Top agencies Army (Department of the Army)	$818,407	0.4%	Rank history: not on the FY2021–FY2022 lists, #25 in FY2023, #18 in FY2024 and #11 in FY2025; up 5 since Jul 2024–Jun 2025.
13	GSI North America Inc. Top agencies Army (Department of the Army)	$771,827	0.4%	Rank history: not on the FY2021–FY2023 lists, #46 in FY2024 and #21 in FY2025; up 12 since Jul 2024–Jun 2025.
14	University of Hawaii 4 awardees Top agencies Navy (Department of the Navy) OSD (Office of the Secretary of Defense)	$738,091	0.4%	Rank history: not on the FY2021–FY2024 lists and #18 in FY2025; up 63 since Jul 2024–Jun 2025.
15	Brown University Top agencies Army (Department of the Army)	$697,137	0.4%	Rank history: #87 in FY2021, #82 in FY2022, #64 in FY2023, #34 in FY2024 and #24 in FY2025; up 48 since Jul 2024–Jun 2025.
16	Woods Hole Oceanographic Institution Top agencies Navy (Department of the Navy)	$657,076	0.3%	Rank history: not on the FY2021–FY2024 lists and #49 in FY2025; up 115 since Jul 2024–Jun 2025.
17	Nederlandse Organisatie Voor Toegepast-Natuurwetenschappelijk Onderzoek TNO Top agencies Navy (Department of the Navy)	$580,743	0.3%	Rank history: not on the FY2021–FY2024 lists and #17 in FY2025; up 1 since Jul 2024–Jun 2025.
18	Applied Research Associates, Inc. Top agencies Army (Department of the Army) NASA (National Aeronautics and Space Administration)	$567,204	0.3%	Rank history: not on the FY2021–FY2023 lists, #87 in FY2024 and not on the FY2025 list; up 53 since Jul 2024–Jun 2025.
19	Biospyder Technologies, Inc. Top agencies EPA (Environmental Protection Agency)	$541,533	0.3%	Rank history: #2 in FY2021, #9 in FY2022, #21 in FY2023, #9 in FY2024 and #14 in FY2025; down 6 since Jul 2024–Jun 2025.
20	Jacobs Government Services Company 2 awardees, including Jacobs Engineering Group Inc. Top agencies Army (Department of the Army)	$535,469	0.3%	Rank history: not on the FY2021–FY2023 lists, #19 in FY2024 and #32 in FY2025; up 14 since Jul 2024–Jun 2025.
21	CDM Federal Programs Corporation Top agencies Army (Department of the Army)	$532,698	0.3%	Rank history: not on the FY2021–FY2024 lists and #43 in FY2025; up 86 since Jul 2024–Jun 2025.
22	Taylor-Woolpert, LLC Top agencies Army (Department of the Army)	$522,057	0.3%	Rank history: not on the FY2021–FY2023 lists, #2 in FY2024 and #52 in FY2025; down 20 since Jul 2024–Jun 2025.
23	University of Notre Dame DU Lac Top agencies Army (Department of the Army)	$511,773	0.3%	Rank history: not on the FY2021–FY2024 lists and #31 in FY2025; up 69 since Jul 2024–Jun 2025.
24	Interphase Materials, Inc. Top agencies OSD (Office of the Secretary of Defense)	$499,587	0.3%	Rank history: not on the FY2021–FY2024 lists and #33 in FY2025; new, not ranked in Jul 2024–Jun 2025.
25	Markit! Forestry Management LLC Top agencies DOI (Department of the Interior)	$471,150	0.2%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
26	Sapere Consulting Inc. Top agencies Army (Department of the Army)	$442,900	0.2%	Rank history: not on the FY2021–FY2023 lists, #63 in FY2024 and #35 in FY2025; up 23 since Jul 2024–Jun 2025.
27	Aquatonomy, Inc. Top agencies Army (Department of the Army)	$400,000	0.2%	Rank history: not on the FY2021–FY2024 lists and #39 in FY2025; up 27 since Jul 2024–Jun 2025.
28	Cornell University Top agencies DOI (Department of the Interior) Army (Department of the Army)	$394,311	0.2%	Rank history: not on the FY2021–FY2024 lists and #67 in FY2025; up 34 since Jul 2024–Jun 2025.
29	Princeton Hydro L.L.C. Top agencies Army (Department of the Army)	$375,900	0.2%	Rank history: not on the FY2021–FY2023 lists, #23 in FY2024 and #40 in FY2025; down 10 since Jul 2024–Jun 2025.
30	Worcester Polytechnic Institute Top agencies DOI (Department of the Interior)	$360,953	0.2%	Rank history: #58 in FY2021, #31 in FY2022, #32 in FY2023, #89 in FY2024 and #37 in FY2025; new, not ranked in Jul 2024–Jun 2025.
31	Arizona State University Top agencies Army (Department of the Army)	$340,932	0.2%	Rank history: not on the FY2021 list, #97 in FY2022, #79 in FY2023, #21 in FY2024 and #27 in FY2025; down 4 since Jul 2024–Jun 2025.
32	Smru, LLC Top agencies Navy (Department of the Navy)	$334,809	0.2%	Rank history: not on the FY2021–FY2024 lists and #66 in FY2025; new, not ranked in Jul 2024–Jun 2025.
33	Case Western Reserve University Top agencies Army (Department of the Army)	$320,502	0.2%	Rank history: not on the FY2021–FY2023 lists, #62 in FY2024 and #60 in FY2025; up 41 since Jul 2024–Jun 2025.
34	Leidos Holdings, Inc. 2 awardees, including Leidos, Inc. Top agencies DOI (Department of the Interior) USDA (Department of Agriculture)	$319,923	0.2%	Rank history: not on the FY2021–FY2024 lists and #90 in FY2025; up 74 since Jul 2024–Jun 2025.
35	Arcadis U.s., Inc. Top agencies Army (Department of the Army)	$314,906	0.2%	Rank history: not on the FY2021 list, #80 in FY2022, not on the FY2023 list, #84 in FY2024 and #23 in FY2025; up 21 since Jul 2024–Jun 2025.
36	Trustees of the Colorado School of Mines Top agencies Army (Department of the Army)	$300,000	0.2%	Rank history: #33 in FY2021, #17 in FY2022, #41 in FY2023, #5 in FY2024 and #20 in FY2025; down 15 since Jul 2024–Jun 2025.
37	Foundation for Marine Ecology and Telemetry Research Top agencies Navy (Department of the Navy)	$286,978	0.2%	Rank history: not on the FY2021–FY2024 lists and #51 in FY2025; up 56 since Jul 2024–Jun 2025.
38	GSI Environmental Inc. Top agencies OSD (Office of the Secretary of Defense) Navy (Department of the Navy)	$272,676	0.1%	Rank history: #29 in FY2021, #21 in FY2022, #45 in FY2023, #33 in FY2024 and not on the FY2025 list; up 103 since Jul 2024–Jun 2025.
39	Harris Environmental Group Inc. Top agencies DOI (Department of the Interior)	$264,011	0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
40	Water Institute of the Gulf Top agencies Army (Department of the Army)	$248,003	0.1%	Rank history: #28 in FY2021, #32 in FY2022, not on the FY2023–FY2024 lists and #22 in FY2025; up 2 since Jul 2024–Jun 2025.
41	Arizona Board of Regents 2 awardees, including University of Arizona Top agencies Army (Department of the Army)	$230,000	0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
42	Aquatechnex LLC Top agencies Army (Department of the Army)	$227,910	0.1%	Rank history: not on the FY2021–FY2024 lists and #78 in FY2025; up 97 since Jul 2024–Jun 2025.
43	Anchor Qea, Inc. Top agencies Army (Department of the Army)	$213,840	0.1%	Rank history: #37 in FY2021, #52 in FY2022, #26 in FY2023, #61 in FY2024 and #57 in FY2025; up 29 since Jul 2024–Jun 2025.
44	University of California, LOS Angeles Top agencies DOI (Department of the Interior)	$201,952	0.1%	Rank history: not on the FY2021–FY2025 lists; up 55 since Jul 2024–Jun 2025.
45	Northeastern University Top agencies Army (Department of the Army)	$200,000	0.1%	Rank history: not on the FY2021–FY2025 lists; up 73 since Jul 2024–Jun 2025.
46	Onterris Treatment Technologies, Inc. Top agencies OSD (Office of the Secretary of Defense)	$200,000	0.1%	Rank history: not on the FY2021–FY2024 lists and #59 in FY2025; new, not ranked in Jul 2024–Jun 2025.
47	Clarkson University Top agencies Army (Department of the Army)	$195,562	0.1%	Rank history: #69 in FY2021, not on the FY2022–FY2024 lists and #81 in FY2025; up 69 since Jul 2024–Jun 2025.
48	Horsley Witten Group, Inc. Top agencies Commerce (Department of Commerce)	$195,478	0.1%	Rank history: not on the FY2021–FY2024 lists and #36 in FY2025; up 19 since Jul 2024–Jun 2025.
49	Azura Consulting LLC Top agencies Navy (Department of the Navy)	$194,571	0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
50	Oregon State University Top agencies Army (Department of the Army)	$188,679	0.1%	Rank history: not on the FY2021–FY2023 lists, #95 in FY2024 and #85 in FY2025; up 10 since Jul 2024–Jun 2025.
51	Science Systems and Applications, Inc. Top agencies DOI (Department of the Interior)	$187,014	0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
52	Trustees of Dartmouth College Top agencies Army (Department of the Army)	$186,049	0.1%	Rank history: not on the FY2021–FY2023 lists, #97 in FY2024 and not on the FY2025 list; new, not ranked in Jul 2024–Jun 2025.
53	Southwest Research Institute Top agencies Army (Department of the Army)	$185,684	0.1%	Rank history: not on the FY2021 list, #99 in FY2022, #66 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
54	University of Florida Top agencies Army (Department of the Army)	$184,330	0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
55	Michigan State University Top agencies DOI (Department of the Interior)	$183,645	0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
56	University of Maryland Baltimore County Top agencies Army (Department of the Army)	$182,695	0.1%	Rank history: not on the FY2021–FY2024 lists and #41 in FY2025; up 42 since Jul 2024–Jun 2025.
57	University of Utah Top agencies DOI (Department of the Interior)	$178,283	0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
58	University of Washington Top agencies Navy (Department of the Navy)	$176,613	0.1%	Rank history: not on the FY2021–FY2023 lists, #68 in FY2024 and #88 in FY2025; down 1 since Jul 2024–Jun 2025.
59	The Trustees of the Stevens Institute of Technology Top agencies Army (Department of the Army)	$175,043	0.1%	Rank history: not on the FY2021–FY2022 lists, #77 in FY2023, #38 in FY2024 and #68 in FY2025; down 11 since Jul 2024–Jun 2025.
60	Clemson University Top agencies OSD (Office of the Secretary of Defense)	$174,585	0.1%	Rank history: #70 in FY2021, #46 in FY2022, #44 in FY2023, #28 in FY2024 and not on the FY2025 list; up 20 since Jul 2024–Jun 2025.
61	Stockton Port District Top agencies Army (Department of the Army)	$165,500	0.1%	Rank history: not on the FY2021–FY2024 lists and #28 in FY2025; down 14 since Jul 2024–Jun 2025.
62	Syracuse University Top agencies Navy (Department of the Navy)	$151,513	0.1%	Rank history: not on the FY2021–FY2022 lists, #81 in FY2023, #82 in FY2024 and #47 in FY2025; up 6 since Jul 2024–Jun 2025.
63	Texas TECH University System Top agencies Army (Department of the Army)	$150,000	0.1%	Rank history: #68 in FY2021, #45 in FY2022, #55 in FY2023 and not on the FY2024–FY2025 lists; up 20 since Jul 2024–Jun 2025.
64	University of Miami Top agencies Army (Department of the Army)	$140,400	0.1%	Rank history: not on the FY2021–FY2024 lists and #58 in FY2025; up 20 since Jul 2024–Jun 2025.
65	Florida International University Top agencies Army (Department of the Army)	$133,406	0.1%	Rank history: not on the FY2021–FY2024 lists and #77 in FY2025; up 49 since Jul 2024–Jun 2025.
66	Duran Environmental Consulting, LLC Top agencies Army (Department of the Army)	$132,000	0.1%	Rank history: not on the FY2021–FY2024 lists and #61 in FY2025; up 20 since Jul 2024–Jun 2025.
67	Northern Arizona University Top agencies Army (Department of the Army)	$130,000	0.1%	Rank history: not on the FY2021–FY2023 lists, #56 in FY2024 and #54 in FY2025; down 3 since Jul 2024–Jun 2025.
68	American Water Defense Services, LLC Top agencies Army (Department of the Army)	$126,137	0.1%	Rank history: not on the FY2021–FY2023 lists, #59 in FY2024 and #71 in FY2025; new, not ranked in Jul 2024–Jun 2025.
69	Zara Environmental LLC Top agencies Army (Department of the Army)	$123,298	0.1%	Rank history: not on the FY2021–FY2024 lists and #72 in FY2025; up 19 since Jul 2024–Jun 2025.
70	University of Maryland, College Park Top agencies Army (Department of the Army)	$118,929	0.1%	Rank history: not on the FY2021–FY2024 lists and #75 in FY2025; new, not ranked in Jul 2024–Jun 2025.
71	Desert Star Systems LLC Top agencies Navy (Department of the Navy)	$117,188	0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
72	Conservation Science & Data Visualization LLC Top agencies Army (Department of the Army)	$115,000	0.1%	Rank history: not on the FY2021–FY2023 lists, #72 in FY2024 and #34 in FY2025; down 46 since Jul 2024–Jun 2025.
73	The Research Foundation for the State University of New York 3 awardees Top agencies Army (Department of the Army)	$112,364	0.1%	Rank history: not on the FY2021 list, #81 in FY2022, not on the FY2023 list, #12 in FY2024 and #7 in FY2025; down 65 since Jul 2024–Jun 2025.
74	Stuart A Cole Top agencies NASA (National Aeronautics and Space Administration)	$105,845	0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
75	The Regents of the University of California Top agencies OSD (Office of the Secretary of Defense)	$105,123	0.1%	Rank history: not on the FY2021–FY2024 lists and #42 in FY2025; new, not ranked in Jul 2024–Jun 2025.
76	University of Texas At Austin Top agencies Army (Department of the Army)	$101,374	0.1%	Rank history: not on the FY2021–FY2024 lists and #82 in FY2025; up 13 since Jul 2024–Jun 2025.
77	Eurofins Lancaster Laboratories Environment Testing, LLC Top agencies Army (Department of the Army)	$97,785	0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
78	Florida Institute of Technology Inc. Top agencies Navy (Department of the Navy)	$94,589	<0.1%	Rank history: not on the FY2021–FY2024 lists and #93 in FY2025; up 48 since Jul 2024–Jun 2025.
79	RB Becken, Inc. Top agencies USDA (Department of Agriculture)	$92,969	<0.1%	Rank history: not on the FY2021–FY2024 lists and #83 in FY2025; new, not ranked in Jul 2024–Jun 2025.
80	The University Court of the University of ST Andrews Top agencies Navy (Department of the Navy)	$92,804	<0.1%	Rank history: #10 in FY2021, #14 in FY2022, #20 in FY2023, #14 in FY2024 and #62 in FY2025; up 7 since Jul 2024–Jun 2025.
81	Incorporated Foundation Okinawa Prefecture Environment Science Center Top agencies Army (Department of the Army)	$88,081	<0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
82	Wapsi Valley Archaeology, Inc. Top agencies Army (Department of the Army)	$87,367	<0.1%	Rank history: not on the FY2021–FY2024 lists and #86 in FY2025; new, not ranked in Jul 2024–Jun 2025.
83	Colorado State University Top agencies OSD (Office of the Secretary of Defense)	$86,705	<0.1%	Rank history: not on the FY2021–FY2023 lists, #100 in FY2024 and #8 in FY2025; down 73 since Jul 2024–Jun 2025.
84	Tetra Tech, Inc. 2 awardees Top agencies EPA (Environmental Protection Agency)	$84,355	<0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
85	Aron Roland Top agencies Army (Department of the Army)	$82,500	<0.1%	Rank history: not on the FY2021–FY2025 lists; up 17 since Jul 2024–Jun 2025.
86	Bizsolutions 360 Inc. Top agencies Army (Department of the Army)	$76,000	<0.1%	Rank history: not on the FY2021–FY2024 lists and #89 in FY2025; new, not ranked in Jul 2024–Jun 2025.
87	Follum Hydrologic Solutions, LLC Top agencies Army (Department of the Army)	$74,200	<0.1%	Rank history: not on the FY2021–FY2022 lists, #39 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
88	Gel Laboratories LLC Top agencies OSD (Office of the Secretary of Defense) Navy (Department of the Navy)	$73,116	<0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
89	Purdue University Top agencies Army (Department of the Army)	$68,444	<0.1%	Rank history: #31 in FY2021, #23 in FY2022, #62 in FY2023, not on the FY2024 list and #95 in FY2025; down 20 since Jul 2024–Jun 2025.
90	Applied Ocean Sciences, LLC Top agencies Navy (Department of the Navy)	$67,261	<0.1%	Rank history: #30 in FY2021, #98 in FY2022, not on the FY2023–FY2024 lists and #96 in FY2025; new, not ranked in Jul 2024–Jun 2025.
91	Southall Environmental Associates Inc. Top agencies Navy (Department of the Navy)	$66,832	<0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
92	Geomorph Information Systems LLC Top agencies USDA (Department of Agriculture)	$64,038	<0.1%	Rank history: not on the FY2021–FY2024 lists and #97 in FY2025; up 65 since Jul 2024–Jun 2025.
93	Nalas Engineering Services Inc Top agencies Army (Department of the Army)	$60,072	<0.1%	Rank history: not on the FY2021–FY2023 lists, #94 in FY2024 and not on the FY2025 list; new, not ranked in Jul 2024–Jun 2025.
94	University of Tennessee Top agencies Army (Department of the Army)	$60,000	<0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
95	University of North Carolina System Office Through University of North Carolina At Chapel Hill Top agencies EPA (Environmental Protection Agency)	$59,997	<0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
96	Fredericktowne Labs Inc. Top agencies Navy (Department of the Navy)	$56,224	<0.1%	Rank history: not on the FY2021–FY2024 lists and #98 in FY2025; new, not ranked in Jul 2024–Jun 2025.
97	Pisces Molecular LLC Top agencies DOI (Department of the Interior)	$49,910	<0.1%	Rank history: not on the FY2021–FY2023 lists, #24 in FY2024 and not on the FY2025 list; down 77 since Jul 2024–Jun 2025.
98	Greenwood Enterprises, LLC Top agencies Navy (Department of the Navy)	$49,742	<0.1%	Rank history: not on the FY2021–FY2025 lists; up 39 since Jul 2024–Jun 2025.
99	Molekule Group, Inc. Top agencies Army (Department of the Army)	$48,088	<0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
100	North Carolina State University Top agencies Army (Department of the Army)	$42,260	<0.1%	Rank history: not on the FY2021–FY2025 lists; down 19 since Jul 2024–Jun 2025.

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100 of 129 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 $189 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.
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 Jul 2024–Jun 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

Who were the top 10 PSC AH contractors in Jul 2025–Jun 2026?

1. RTX Corporation ($134M), 2. University Corporation for Atmospheric Research ($13.1M), 3. University of Wisconsin System ($4.25M), 4. M2 Strategy Inc. ($3.42M), 5. Board of Regents of Nevada System of Higher Education ($3M), 6. Credere Associates, LLC ($2.28M), 7. Specpro Sustainment and Environmental, LLC ($2.2M), 8. Virginia Department of Wildlife Resources ($1.68M), 9. S.l. Ross Environmental Research Limited ($1.37M), 10. University of California Santa Cruz ($1.04M).

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