| # | Company name | Role | # of projects |
|---|---|---|---|
| 1 | Darviche Haddad Teknofor Piling & Shoring Company | Geotechnical engineering | 3 |
| 2 | Davies Geotechnical Inc. | Geotechnical engineering | 2 |
| 3 | Diaz•Yourman & Associates | Geotechnical engineering | 1 |
| 4 | Douglas Partners Pty Ltd | Geotechnical engineering | 1 |
| 5 | Dr. Vollenweider AG | Geotechnical engineering | 2 |
| 6 | Driggers Engineering Services, Inc. | Geotechnical engineering | 15 |
| 7 | Dyregrov Consultants | Geotechnical engineering | 10 |