Top 26 Contractors in PSC B502: Air Quality Analysis, Jul 2025–Jun 2026
Parent companies by net contract obligations Jul 1, 2025 – Jun 30, 2026 Code page on GovTribe
The top 10 won 94% of PSC B502 contract dollars from July 2025 through June 2026
Ranking facts
- Contract obligations
- $9,981,874 Net of deobligations, by contracts coded PSC B502
- Contractors
- 27 Parent companies with an obligation
- Largest contractor
- University of California, Davis $2.72 million, 26.1% of obligations
- Data as of
Contract actions from FPDS (SAM.gov). How the rankings work · Download all 26 rows as CSV
Full ranking
| Rank | Contractor | Net obligations | Share | Trend |
|---|---|---|---|---|
| 1 | $2,722,726 | |||
| 2 | $2,421,781 | |||
| 3 | $2,320,508 | |||
| 4 | $766,260 | |||
| 5 | $743,605 | |||
| 6 | $504,644 | |||
| 7 | $128,636 | |||
| 8 | $66,823 | |||
| 9 |
MES Service Company, LLC
Top agencies
|
$60,000 | ||
| 10 |
Satori Defense LLC
Top agencies
|
$49,440 | ||
| 11 |
I-2-I Solutions, Inc.
Top agencies
|
$45,500 | ||
| 12 | $42,777 | |||
| 13 | $40,250 | |||
| 14 | $39,325 | |||
| 15 | $22,994 | |||
| 16 |
Aehs Incorporated
Top agencies
|
$20,771 | ||
| 17 |
Sage-Efs JV
Top agencies
|
$15,074 | ||
| 18 | $14,000 | |||
| 19 | $13,499 | |||
| 20 |
Eastern New Mexico University
Top agencies
|
$13,277 | ||
| 21 |
Coterie Environmental LLC
Top agencies
|
$12,757 | ||
| 22 |
Clearair, Inc.
Top agencies
|
$10,990 | ||
| 23 | $9,536 | |||
| 24 |
SGS North America Inc.
Top agencies
|
$4,795 | ||
| 25 |
Tri Airtesting Inc.
Top agencies
|
$2,112 | ||
| 26 | $1,304 |
Show 1 more
26 of 27 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 $10.4 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 B502 contractors in Jul 2025–Jun 2026?
1. University of California, Davis ($2.72M), 2. General Dynamics Corporation ($2.42M), 3. Air Resource Specialists, Inc. ($2.32M), 4. Nevada System of Higher Education ($766K), 5. H & L Environmental Services, LLC ($744K), 6. WSP USA Environment & Infrastructure Inc. ($505K), 7. Trine Environmental Inc. ($129K), 8. Mabbett & Associates, Inc. ($66.8K), 9. MES Service Company, LLC ($60K), 10. Satori Defense LLC ($49.4K).
On GovTribe
Research every contractor on this list
- Every contract, task order and IDV they hold
- Their subsidiaries, teammates and competitors
- Open opportunities they're positioned for
- Alerts when they win new work