| PITTS INVESTMENT COMPANY LIMITED | Private company limited by shares | Dissolved |
| PITTSBORO LIMITED | Private company limited by shares | Dissolved |
| 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 |
| PITTSFIELD COMPANY LIMITED | Private company limited by shares | Dissolved |
| PITTSHINE LIMITED | Private company limited by shares | Live |
| PITTSLAND LIMITED | Private company limited by shares | Live |
| PITTSTON LIMITED | Private company limited by shares | Dissolved |
| PITTSWORTH LIMITED | Private company limited by shares | Dissolved |