| Company Name | Type | Status |
|---|---|---|
| PITTSBURGH LIMITED | Private company limited by shares | Dissolved |
| Pittsburgh Corning Asia Limited | Private company limited by shares | Live |
| Pittsburgh Glass Works Hong Kong Limited | Private company limited by shares | Live |
| PITTSBURGH GLASS WORKS LIMITED | Private company limited by shares | Live |
| PITTSBURGH INTERNATIONAL CONSULTANTS LIMITED | Private company limited by shares | Dissolved |
| PITTSBURGH REALTY LIMITED | Private company limited by shares | Dissolved |