| # | Company name | Role | # of Projects |
|---|---|---|---|
| 1 | 20 Below Studio | interior designer | 2 |
| 2 | A2 Design UAB | interior designer | 1 |
| 3 | Aaro Kohonen Oy | interior designer | 1 |
| 4 | A.B.C.D. Group | interior designer | 1 |
| 5 | Abode, Inc. | interior designer | 1 |
| 6 | Acapella Design Inc. | interior designer | 0 |
| 7 | Adams Design Group, Inc. | interior designer | 0 |
| 8 | Adella P. Estrada | interior designer | 1 |
| 9 | Ad Infinitum Design Interiors | interior designer | 0 |
| 10 | ADM Associates | interior designer | 13 |
| 11 | Admiralty Trading Company | interior designer | 0 |
| 12 | Adrienne Chinn Design Company Ltd. | interior designer | 0 |
| 13 | Aero Studios Ltd. | interior designer | 2 |
| 14 | AFS Design Limited. | interior designer | 0 |
| 15 | Agence Alberto Pinto | interior designer | 2 |
| 16 | Agence Andrée Putman | interior designer | 2 |
| 17 | Agence Élizabeth de Portzamparc | interior designer | 2 |
| 18 | Agencja Artystyczna 3-A ASP Sp. z o.o. | interior designer | 1 |
| 19 | Agentur für Innenarchitektur und Design Egon Krautwurst | interior designer | 0 |
| 20 | Agostino's Design Group | interior designer | 13 |