Funding round
STAX Engineering Growth
Reported as "Growth Equity"
STAX Engineering, which works in emissions capture and control technology development in Long Beach, raised $150M in a Growth round announced on 23 Mar 2025. It is STAX Engineering's third venture round on record; the one before was a Growth in Feb 2025.
$150M
Amount raised
Not disclosed
Post-money valuation
Valuation
What this round says about the price
STAX Engineering did not disclose a valuation in this round. It came 1 month after STAX Engineering's Growth. It is 37% of the $410M STAX Engineering has raised in the venture rounds on record. STAX Engineering raised again 15 months later: a Growth round of $150M in Jun 2026.
STAX Engineering's funding rounds
STAX Engineering has 4 venture rounds on record and 1 other deal. This one is highlighted.
Use of proceeds
What the money is for
According to the announcement, the money goes to product development, geographic expansion and scaling operations.
- Product development
- Geographic expansion
- Scaling operations
Comparable rounds
How it compares
The closest in time, other companies' Growth rounds in Environmental Engineering Services:
| Company | Announced | Amount | Post-money | Led by |
|---|---|---|---|---|
| Climeworks Environmental Engineering Services | 2 Jul 2025 | $162M | $1.10B | BigPoint Holding and Partners Group |
| RSK Group Environmental Engineering Services | 23 Sep 2024 | $690M | not disclosed | Searchlight Capital and Ares Management |
| Environmental Engineering Services | 26 Jun 2024 | $21M | not disclosed | not named |
| Environmental Engineering Services | 3 Dec 2025 | $4.4M | not disclosed | Vertis SGR |
Sources
Where this comes from
Reported by 2 sources.
Questions
Frequently asked
How much did STAX Engineering raise in its Growth round?
STAX Engineering raised $150M in its Growth round, announced in Mar 2025.
What was STAX Engineering's valuation at the Growth round?
It was not disclosed.
Did STAX Engineering raise again after this round?
Yes: a Growth round in Jun 2026 of $150M.