| # | Company name | Role | # of projects |
|---|---|---|---|
| 1 | Enders & Dührkop | Geotechnical engineering | 3 |
| 2 | EnGen Corporation | Geotechnical engineering | 1 |
| 3 | Engineering Consulting Services, Ltd. | Geotechnical engineering | 13 |
| 4 | Engineering Partners International LLC | Geotechnical engineering | 0 |
| 5 | Engineering Partners International LLC | Geotechnical engineering | 3 |
| 6 | Engineering Tectonics | Geotechnical engineering | 2 |
| 7 | Environmental Testing & Engineering | Geotechnical engineering | 1 |
| 8 | EWRE Ltd. | Geotechnical engineering | 3 |