Top 44 Contractors in PSC 6636: Environmental Chambers and Related Equipment, Aug 2025–Jul 2026
Parent companies by net contract obligations Aug 1, 2025 – Jul 31, 2026 Code page on GovTribe
The latest 12 months. See the newest fiscal year's list: Top Contractors in PSC 6636: Environmental Chambers and Related Equipment, FY2025.
The top 10 won 81% of PSC 6636 contract dollars from August 2025 through July 2026
Ranking facts
- Contract obligations
- $8,580,393 Net of deobligations, by contracts coded PSC 6636
- Contractors
- 44 Parent companies with an obligation
- Largest contractor
- Jiracor LLC $2 million, 22.5% of obligations
- Data as of
Contract actions from FPDS (SAM.gov). How the rankings work · Download all 44 rows as CSV · Free to reuse with credit to GovTribe (CC BY 4.0)
Full ranking
| Rank | Contractor | Net obligations | Share | Trend |
|---|---|---|---|---|
| 1 |
Jiracor LLC
Top agencies
|
$1,995,136 | ||
| 2 | $1,374,000 | |||
| 3 | $978,971 | |||
| 4 | $635,870 | |||
| 5 | $594,420 | |||
| 6 | $454,812 | |||
| 7 |
Barbour Stockwell, Inc.
Top agencies
|
$440,750 | ||
| 8 |
Wraith Technologies, Inc.
Top agencies
|
$334,584 | ||
| 9 |
Darwin Chambers Co LLC
Top agencies
|
$229,768 | ||
| 10 | $166,182 | |||
| 11 | $165,000 | |||
| 12 | $158,600 | |||
| 13 | $129,915 | |||
| 14 |
Michael Renka Export GMBH
Top agencies
|
$95,060 | ||
| 15 |
Thunder Scientific Corp
Top agencies
|
$85,000 | ||
| 16 |
Team Corporation
Top agencies
|
$84,442 | ||
| 17 |
Vprime TECH Inc.
Top agencies
|
$76,053 | ||
| 18 |
Auto Technology Company
Top agencies
|
$74,503 | ||
| 19 |
TPS LLC
Top agencies
|
$73,446 | ||
| 20 |
MG Scientific, Inc.
Top agencies
|
$57,022 | ||
| 21 | $54,795 | |||
| 22 | $41,200 | |||
| 23 |
Venturedyne Ltd
Top agencies
|
$35,323 | ||
| 24 |
Jenks Inc.
Top agencies
|
$31,434 | ||
| 25 | $25,261 | |||
| 26 | $24,869 | |||
| 27 | $23,451 | |||
| 28 | $21,346 | |||
| 29 | $20,415 | |||
| 30 | $19,277 | |||
| 31 | $18,816 | |||
| 32 | $18,498 | |||
| 33 |
T.g.m., Inc.
Top agencies
|
$17,910 | ||
| 34 |
Memmert USA LLC
Top agencies
|
$17,764 | ||
| 35 |
Sign Solutions Usa, LLC
Top agencies
|
$16,875 | ||
| 36 | $15,971 | |||
| 37 | $15,000 | |||
| 38 | $12,770 | |||
| 39 |
Linde Engineering North America LLC
Top agencies
|
$12,000 | ||
| 40 |
Kampi Components Co Inc.
Top agencies
|
$9,829 | ||
| 41 | $7,841 | |||
| 42 | $3,786 | |||
| 43 |
Wunderlich-Malec Services, Inc.
Top agencies
|
$3,220 | ||
| 44 |
Digi International Inc.
Top agencies
|
$3,201 |
Show all 44
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 $8.87 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. 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
Who were the top 10 PSC 6636 contractors in Aug 2025–Jul 2026?
1. Jiracor LLC ($2M), 2. Applied Physical Electronics, LC ($1.37M), 3. PPG Industries, Inc. ($979K), 4. Consolidated Safety Services Incorporated ($636K), 5. Percival Scientific Incorporated ($594K), 6. Integrated Development & Manufacturing Company ($455K), 7. Barbour Stockwell, Inc. ($441K), 8. Wraith Technologies, Inc. ($335K), 9. Darwin Chambers Co LLC ($230K), 10. Copper Collar Group LLC ($166K).
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