| # | Company name | Role | # of projects |
|---|---|---|---|
| 581 | Adrian Smith + Gordon Gill Architecture LLP | Architect | 33 |
| 582 | Adrian Streich Architekten AG | Architect | 2 |
| 583 | Adrian Wewer | Architect | 5 |
| 584 | Adrian Wilson & Associates | Architect | 6 |
| 585 | Adriance Van Brunt & Brother | Architect | 2 |
| 586 | Adriano Melo Arquitetura e Urbanismo Ltda | Architect | 1 |
| 587 | Adrianus Cornelis van Loo | Architect | 1 |
| 588 | Adrien Blomme | Architect | 1 |
| 589 | Adrien Fainsilber et Associés | Architect | 2 |
| 590 | Adrien Rey | Architect | 1 |
| 591 | ADS Group | Architect | 1 |
| 592 | ADS Studio | Architect | 1 |
| 593 | ADT Architects Design Team | Architect | 1 |
| 594 | Advance City Planning Co., Ltd. | Architect | 1 |
| 595 | Advanced Architectural Concepts dba SWAAC | Architect | 0 |
| 596 | Advanced Architectural Design Studios, Ltd. | Architect | 1 |
| 597 | Advanced Design Group | Architect | 5 |
| 598 | Advanced Engineering Concepts | Architect | 1 |
| 599 | Advanced Storage Technology | Architect | 1 |
| 600 | Advantage | Architect | 0 |