| # | Company name | Role | # of projects |
|---|---|---|---|
| 1 | Portman Architects | Architect | 88 |
| 2 | P & T Architects & Engineers Limited | Architect | 158 |
| 3 | P & T Architects & Engineers Ltd. | Architect | 6 |
| 4 | P & W Architects | Architect | 0 |
| 5 | P & W Architects | Architect | 5 |
| 6 | P + R, Arendt - Boche - Krüger | Architect | 1 |
| 7 | P Architects | Architect | 0 |
| 8 | P G A & L Archs | Architect | 6 |
| 9 | P G A Architects Ltd. | Architect | 5 |
| 10 | P G Patki Associates | Architect | 8 |
| 11 | P Georgopoulos Architect PC | Architect | 5 |
| 12 | P Georgopouls Architect | Architect | 1 |
| 13 | P H & J Archs Inc | Architect | 0 |
| 14 | P H Schwendener Inc | Architect | 1 |
| 15 | P J M Architect PC | Architect | 1 |
| 16 | P M Architects Inc. | Architect | 0 |
| 17 | P S Architects | Architect | 0 |
| 18 | P S M Architects | Architect | 2 |
| 19 | P W Campbell Contracting Co. | Architect | 1 |
| 20 | P W Scott Engineering & Architecture PC | Architect | 0 |