Company data
Tetra Tech, Inc. employees and revenue per employee
TTEK · Engineering & Construction · $8.60B market cap
Tetra Tech, Inc. had 25,000 employees at the end of fiscal Sep 2025, down 16.7% from a year earlier. Revenue for the year was $5.44B, up 4.7% from a year earlier, or $218K per employee. Revenue held up or grew while headcount stayed flat or fell.
Employees
25,000
-16.7% YoY
Revenue
$5.44B
+4.7% YoY
Revenue / employee
$218K
Peer median $364K
Rank in industry
14 of 15
Engineering & Construction
Headcount against revenue
Both lines start at 100 in the first year we hold, so you can see which one grew faster.
Hover a year for the numbers.
| Year ending | Employees | Revenue | Per employee | Staff YoY | Revenue YoY |
|---|---|---|---|---|---|
| Sep 2025 | 25,000 | $5.44B | $218K | -16.7% | +4.7% |
| Sep 2024 | 30,000 | $5.20B | $173K | +11.1% | +15.0% |
| Oct 2023 | 27,000 | $4.52B | $168K | +28.6% | +59.5% |
| Oct 2022 | 21,000 | $2.84B | $135K | +0.0% | -11.8% |
| Oct 2021 | 21,000 | $3.21B | $153K | +5.0% | +36.8% |
| Sep 2020 | 20,000 | $2.35B | $117K | +0.0% | -24.4% |
| Sep 2019 | 20,000 | $3.11B | $155K | +17.6% | +4.8% |
| Sep 2018 | 17,000 | $2.96B | $174K | +6.3% | +7.7% |
| Oct 2017 | 16,000 | $2.75B | $172K | +0.0% | +6.6% |
| Oct 2016 | 16,000 | $2.58B | $161K | — | — |
Open roles: we have not matched a verified job board for this company yet.
Tetra Tech, Inc. against similar companies
The closest industry peers by revenue, from Engineering & Construction.
| Company | Employees | Revenue | Revenue / employee | Shape |
|---|---|---|---|---|
| STRL Sterling Infrastructure, Inc. | 4,400 | $2.49B | $566K | Hiring ahead |
| FIX Comfort Systems USA, Inc. | 22,700 | $9.10B | $401K | Efficient growth |
| LGN Legence Corp. Class A Common stock | 7,000 | $2.55B | $364K | — |
| IESC IES Holdings, Inc. | 10,262 | $3.37B | $329K | Efficient growth |
| DY Dycom Industries, Inc. | 19,556 | $5.55B | $284K | Hiring ahead |
| J Jacobs Solutions Inc. | 43,000 | $12.0B | $280K | Leaner |
| APG APi Group Corporation | 29,000 | $7.91B | $273K | Leaner |
| TTEK Tetra Tech, Inc. | 25,000 | $5.44B | $218K | Leaner |
| KBR KBR, Inc. | 36,000 | $7.79B | $216K | Leaner |
Questions about Tetra Tech, Inc.
- How many employees does Tetra Tech, Inc. have?
- Tetra Tech, Inc. reported 25,000 employees for the fiscal year ending Sep 2025, in the annual report it filed on November 20, 2025. That is down 16.7% from a year earlier.
- What is Tetra Tech, Inc.'s revenue per employee?
- Tetra Tech, Inc. brought in $5.44B of revenue in fiscal Sep 2025, which is $218K per employee. That ranks 14 of 15 companies we track in Engineering & Construction, where the median is $364K.
- Where do these numbers come from?
- Employee counts and revenue are taken from each company's own annual report (Form 10-K). Open roles are counted from the company's public job board where we have matched one. Companies report headcount once a year, sometimes rounded, so small changes can be noise.
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Source: employee counts and revenue as stated in Tetra Tech, Inc.'s annual reports (Form 10-K), latest filed November 20, 2025. This is data, not a recommendation to buy or sell TTEK.