| # | Company name | Role | # of projects |
|---|---|---|---|
| 181 | Stenn-Gassman Engineers, Inc. | Consultancy | 2 |
| 182 | Stephen Grubits & Associates Pty Ltd. | Consultancy | 1 |
| 183 | Stephen Grubits & Associates Pty Ltd. | Consultancy | 0 |
| 184 | Sterling Design Group | Consultancy | 1 |
| 185 | Sterling Engineering Consultancy | Consultancy | 31 |
| 186 | Steven Winter Associates, Inc | Consultancy | 15 |
| 187 | Stewart Associates | Consultancy | 1 |
| 188 | Stewart Design Associates, Inc. | Consultancy | 0 |
| 189 | Stievater & Associates: Architects | Consultancy | 2 |
| 190 | Stiftelsen SINTEF | Consultancy | 1 |
| 191 | Still & Svitchan | Consultancy | 0 |
| 192 | Stirling Maynard & Partners Ltd. | Consultancy | 0 |
| 193 | Stockton Blue Reprographics | Consultancy | 3 |
| 194 | Stohl Environmental Llc | Consultancy | 1 |
| 195 | Stoneylane Limited | Consultancy | 0 |
| 196 | Stoutenborough Inc, Architects & Planners | Consultancy | 1 |
| 197 | Støltun AS | Consultancy | 2 |
| 198 | Strand Systems Engineering | Consultancy | 0 |
| 199 | Strato Graphix | Consultancy | 0 |
| 200 | Streetworks | Consultancy | 0 |