| Business | Phone |
| A-D Engineering Group Ltd 130 Davis Dr #202, Newmarket L3Y 2N1 | (905) 773-2088 |
| Rams Consultants 1091 Gorham St #209, Newmarket L3Y 7V1 | (905) 836-2279 |
| Leslie Engineering Ltd 17665 Leslie St #42, Newmarket L3Y 3E3 | (905) 853-7444 |
| Lotek Wireless Inc 115 Pony Dr, Newmarket L3Y 7B5 | (905) 836-6680 |
| Quaile Engineering Ltd 130 Davis Dr, Newmarket L3Y 2N1 | (905) 853-8547 |
| R J Burnside & Assoc Ltd 16775 Yonge St, Newmarket L3Y 8J4 | (905) 953-8967 |
| Ral Engineering Ltd 17665 Leslie St #47, Newmarket L3Y 3E3 | (905) 853-0626 |
| Shaheen & Peaker Ltd 1228 Gorham St #10, Newmarket L3Y 7V1 | (905) 898-6474 |
| Uderstadt Associates 1235 Gorham St, Newmarket L3Y 7V1 | (905) 953-1518 |
| Environmental Technology Group 482 Queen St, Newmarket L3Y 2H4 | (905) 836-5438 |
| Feherty & Assoc 411 Queen St, Newmarket L3Y 2G9 | (905) 898-3543 |
| G Dewinne Management Inc 936 Elgin St, Newmarket L3Y 3C1 | (905) 898-3859 |