| COFFEY SERVICES AUSTRALIA PTY LTD | Former Name (Historical) | ASIC |
| COFFEY CORPORATE SERVICES PTY LTD | Former Name (Historical) | ASIC |
| COFFEY SERVICES AUSTRALIA PTY LTD | Former Name (Historical) | ASIC |
| TETRA TECH COFFEY PTY LTD | Main Name (Current) | ABR |
| COFFEY SERVICES AUSTRALIA PTY LTD | Main Name (Historical) | ABR |
| COFFEY CORPORATE SERVICES PTY LTD | Main Name (Historical) | ABR |
| Coffey Services Australia Pty Ltd | Main Name (Historical) | ABR |
| COFFEY CORPORATE SERVICES PTY LTD | Main Trading Name (Current) | ABR |
| Coffey Corporate Services Pty Ltd | Other Trading Name (Current) | ABR |
| Tetra Tech Services | Business Name (Current) | ABR |
| Coffey Testing | Business Name (Current) | ABR |
| TETRA TECH PROTEUS | Business Name (Current) | ABR |
| proteus EPCM engineers | Business Name (Historical) | ABR |
| tetra tech proteus oil & gas | Business Name (Historical) | ABR |