Top 44 Contractors in PSC 6636: Environmental Chambers and Related Equipment, Jul 2025–Jun 2026

Full ranking

Rank	Contractor	Net obligations	Share	Trend
1	Jiracor LLC Top agencies Army (Department of the Army)	$1,995,136	22.2%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
2	Applied Physical Electronics, LC Top agencies Navy (Department of the Navy)	$1,374,000	15.3%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
3	Cuming-Lehman Chambers, Inc. Top agencies Navy (Department of the Navy)	$699,351	7.8%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
4	Consolidated Safety Services Incorporated Top agencies NASA (National Aeronautics and Space Administration)	$635,870	7.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
5	Percival Scientific Incorporated Top agencies USDA (Department of Agriculture)	$594,420	6.6%	Rank history: #11 in FY2021, #20 in FY2022, #14 in FY2023, #11 in FY2024 and #2 in FY2025; up 4 since Jul 2024–Jun 2025.
6	Integrated Development & Manufacturing Company Top agencies USDA (Department of Agriculture)	$454,812	5.1%	Rank history: not on the FY2021 list, #44 in FY2022, not on the FY2023–FY2024 lists and #3 in FY2025; new, not ranked in Jul 2024–Jun 2025.
7	Barbour Stockwell, Inc. Top agencies Army (Department of the Army)	$440,750	4.9%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
8	Wraith Technologies, Inc. Top agencies Army (Department of the Army)	$334,584	3.7%	Rank history: not on the FY2021–FY2023 lists, #57 in FY2024 and #7 in FY2025; up 43 since Jul 2024–Jun 2025.
9	PPG Industries, Inc. Top agencies USAF (Department of the Air Force)	$279,620	3.1%	Rank history: not on the FY2021 list, #7 in FY2022, #6 in FY2023, #14 in FY2024 and #6 in FY2025; up 2 since Jul 2024–Jun 2025.
10	Darwin Chambers Co LLC Top agencies Commerce (Department of Commerce)	$229,768	2.6%	Rank history: not on the FY2021–FY2022 lists, #13 in FY2023, #19 in FY2024 and #9 in FY2025; up 7 since Jul 2024–Jun 2025.
11	Copper Collar Group LLC Top agencies USAF (Department of the Air Force)	$166,182	1.8%	Rank history: not on the FY2021–FY2024 lists and #11 in FY2025; new, not ranked in Jul 2024–Jun 2025.
12	Pikes Peak Data Sciences Corp Top agencies NASA (National Aeronautics and Space Administration)	$165,000	1.8%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
13	ST Croix Sensory Inc. Top agencies Treasury (Department of the Treasury)	$158,600	1.8%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
14	Stumptown Research & Development, LLC Top agencies Army (Department of the Army)	$129,915	1.4%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
15	Ametek Inc. Through Advanced Measurement Technology Inc. Top agencies Navy (Department of the Navy)	$125,926	1.4%	Rank history: not on the FY2021–FY2022 lists, #49 in FY2023, not on the FY2024 list and #12 in FY2025; up 22 since Jul 2024–Jun 2025.
16	Michael Renka Export GMBH Top agencies Army (Department of the Army)	$95,060	1.1%	Rank history: not on the FY2021–FY2024 lists and #14 in FY2025; new, not ranked in Jul 2024–Jun 2025.
17	Thunder Scientific Corp Top agencies DLA (Defense Logistics Agency)	$85,000	0.9%	Rank history: #8 in FY2021, #13 in FY2022, #20 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
18	RDP Corporation Top agencies Navy (Department of the Navy)	$84,520	0.9%	Rank history: not on the FY2021 list, #26 in FY2022, not on the FY2023 list, #13 in FY2024 and #15 in FY2025; new, not ranked in Jul 2024–Jun 2025.
19	Team Corporation Top agencies Navy (Department of the Navy)	$84,442	0.9%	Rank history: not on the FY2021–FY2024 lists and #10 in FY2025; down 4 since Jul 2024–Jun 2025.
20	Vprime TECH Inc. Top agencies Navy (Department of the Navy)	$76,053	0.8%	Rank history: not on the FY2021–FY2023 lists, #29 in FY2024 and not on the FY2025 list; up 5 since Jul 2024–Jun 2025.
21	TPS LLC Top agencies DOT (Department of Transportation)	$73,446	0.8%	Rank history: not on the FY2021–FY2024 lists and #13 in FY2025; up 14 since Jul 2024–Jun 2025.
22	Abbess Instruments and Systems, Inc. Top agencies USAF (Department of the Air Force)	$62,000	0.7%	Rank history: not on the FY2021–FY2024 lists and #17 in FY2025; new, not ranked in Jul 2024–Jun 2025.
23	MG Scientific, Inc. Top agencies USDA (Department of Agriculture)	$57,022	0.6%	Rank history: not on the FY2021–FY2024 lists and #18 in FY2025; new, not ranked in Jul 2024–Jun 2025.
24	P & G Manufacturing of Washington, Inc. Top agencies USDA (Department of Agriculture)	$41,200	0.5%	Rank history: not on the FY2021–FY2024 lists and #20 in FY2025; new, not ranked in Jul 2024–Jun 2025.
25	Venturedyne Ltd Top agencies Navy (Department of the Navy)	$35,323	0.4%	Rank history: #7 in FY2021, #4 in FY2022, #4 in FY2023, #1 in FY2024 and not on the FY2025 list; down 22 since Jul 2024–Jun 2025.
26	Jenks Inc. Top agencies Navy (Department of the Navy)	$31,434	0.3%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
27	Wrigglesworth Enterprises Inc. Top agencies DOI (Department of the Interior)	$27,898	0.3%	Rank history: not on the FY2021–FY2022 lists, #28 in FY2023, not on the FY2024 list and #25 in FY2025; new, not ranked in Jul 2024–Jun 2025.
28	Attestor Forensics US Inc. Top agencies DHS (Department of Homeland Security)	$25,261	0.3%	Rank history: not on the FY2021–FY2024 lists and #27 in FY2025; new, not ranked in Jul 2024–Jun 2025.
29	Unique Technology Systems LLC Top agencies Army (Department of the Army)	$24,869	0.3%	Rank history: not on the FY2021–FY2024 lists and #28 in FY2025; new, not ranked in Jul 2024–Jun 2025.
30	Accessibility Services Inc. Top agencies VA (Department of Veterans Affairs)	$23,451	0.3%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
31	Thomas Scientific, LLC Top agencies DHS (Department of Homeland Security)	$21,346	0.2%	Rank history: not on the FY2021–FY2024 lists and #30 in FY2025; new, not ranked in Jul 2024–Jun 2025.
32	Kurt J Lesker Co Top agencies Commerce (Department of Commerce) Navy (Department of the Navy)	$18,816	0.2%	Rank history: #9 in FY2021, not on the FY2022–FY2024 lists and #5 in FY2025; down 22 since Jul 2024–Jun 2025.
33	T.g.m., Inc. Top agencies Commerce (Department of Commerce)	$17,910	0.2%	Rank history: not on the FY2021–FY2024 lists and #32 in FY2025; new, not ranked in Jul 2024–Jun 2025.
34	Memmert USA LLC Top agencies Treasury (Department of the Treasury)	$17,764	0.2%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
35	Sign Solutions Usa, LLC Top agencies Army (Department of the Army)	$16,875	0.2%	Rank history: not on the FY2021–FY2024 lists and #34 in FY2025; new, not ranked in Jul 2024–Jun 2025.
36	Aantilia LLC Top agencies NASA (National Aeronautics and Space Administration)	$15,971	0.2%	Rank history: not on the FY2021–FY2023 lists, #12 in FY2024 and #4 in FY2025; down 31 since Jul 2024–Jun 2025.
37	Desert Environmental Services, Inc. Top agencies DOJ (Department of Justice)	$15,000	0.2%	Rank history: not on the FY2021–FY2024 lists and #36 in FY2025; new, not ranked in Jul 2024–Jun 2025.
38	American Industrial Hygiene Association Top agencies USAF (Department of the Air Force)	$12,770	0.1%	Rank history: not on the FY2021–FY2024 lists and #37 in FY2025; new, not ranked in Jul 2024–Jun 2025.
39	Linde Public Limited Company Through Linde Engineering North America LLC Top agencies NASA (National Aeronautics and Space Administration)	$12,000	0.1%	Rank history: not on the FY2021–FY2023 lists, #2 in FY2024 and #38 in FY2025; down 37 since Jul 2024–Jun 2025.
40	Kampi Components Co Inc. Top agencies DLA (Defense Logistics Agency)	$9,829	0.1%	Rank history: #46 in FY2021, not on the FY2022 list, #47 in FY2023, #58 in FY2024 and not on the FY2025 list; up 12 since Jul 2024–Jun 2025.
41	Par Defense Industries, LLC Top agencies DLA (Defense Logistics Agency)	$7,841	0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
42	RJH Air Conditioning and Refrigeration Service L.L.C. Top agencies NARA (National Archives and Records Administration)	$3,786	<0.1%	Rank history: not on the FY2021–FY2024 lists and #35 in FY2025; up 5 since Jul 2024–Jun 2025.
43	Wunderlich-Malec Services, Inc. Top agencies Navy (Department of the Navy)	$3,220	<0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
44	Digi International Inc. Top agencies DHA (Defense Health Agency)	$3,201	<0.1%	Rank history: not on the FY2021 list, #37 in FY2022, #30 in FY2023, #47 in FY2024 and #29 in FY2025; down 12 since Jul 2024–Jun 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 $8.98 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.

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