| Ark Theatre Company | Founding Company | Los Angeles |
| Circle X Theatre Co. | Founding Company | Los Angeles |
| Ensemble Studio Theatre - The LA Project | Founding Company | Los Angeles |
| Greenway Arts Alliance | Founding Company | Los Angeles |
| Kirk Douglas Theatre | Founding Company | Culver City |
| Lodestone Theatre Ensemble | Founding Company | Studio City |
| Lucid By Proxy | Member Company | North Hollywood |
| Moving Arts | Founding Company | Los Angeles |
| Open Fist Theatre Company | Founding Company | Los Angeles |
| Padua Playwrights | Founding Company | Los Angeles |
| Powerhouse Theatre Company | Founding Company | Santa Monica |
| RED DOG SQUADRON | Member Company | Los Angeles |
| Robey Theatre Company | Founding Company | Sherman Oaks |
| Rude Guerilla Theatre Company | Founding Company | Santa Ana |
| Sacred Fools Theater Company | Founding Company | Los Angeles |
| Santa Monica Playhouse | Member Company | Santa Monica |
| Son of Semele Ensemble | Founding Company | Los Angeles |
| Syzygy Theatre Group | Founding Company | Glendale |
| The Chance Theater | Founding Company | Anaheim |
| The MET Theatre | Founding Company | Los Angeles |
| The Road Theatre Company | Founding Company | North Hollywood |
| Theatre Neo | Founding Company | Los Angeles |
| Theatre of NOTE | Founding Company | Los Angeles |
