| # | Company name | Role | # of Projects |
|---|---|---|---|
| 1 | Arup VT | elevator consultant | 1 |
| 2 | Atlantic Consulting Inc. | elevator consultant | 0 |
| 3 | Barker Mohandas, LLC | elevator consultant | 19 |
| 4 | Bredan Elevator Consultants | elevator consultant | 1 |
| 5 | Calvin Kort Associates | elevator consultant | 0 |
| 6 | D2E International/Barker Mohandas | elevator consultant | 1 |
| 7 | Desmond Associates, Inc. | elevator consultant | 4 |
| 8 | Dunbar & Boardman Partnership Ltd | elevator consultant | 1 |
| 9 | Edgett Williams Consulting Group, Inc | elevator consultant | 21 |
| 10 | Elevator Advisors, Inc. | elevator consultant | 3 |
| 11 | Elevator Advisory Group, Inc. | elevator consultant | 1 |
| 12 | Elrom Elevator Consultants | elevator consultant | 13 |
| 13 | ESL - Eng. S. Lustig Consulting Engineers Ltd. | elevator consultant | 100 |
| 14 | GBH Design GmbH | elevator consultant | 5 |
| 15 | Gulf Elevators Co. | elevator consultant | 0 |
| 16 | Hesselberg, Keesee & Associates, Inc. | elevator consultant | 2 |
| 17 | H.H. Angus & Associates Incorporated | elevator consultant | 4 |
| 18 | HKA Elevator Consulting, Inc | elevator consultant | 15 |
| 19 | HSConsult | elevator consultant | 2 |
| 20 | Hundt & Partner Ingenieurgesellschaft mbH | elevator consultant | 3 |