| PRIMUS INVESTMENT COMPANY LIMITED | Private company limited by shares | Dissolved |
| PRIMUS INVESTMENTS COMPANY LIMITED | Private company limited by shares | Dissolved |
| Primus Jacobian Limited | Private company limited by shares | Live |
| Primus Langevin Limited | | Live |
| Primus Majorana Limited | | Live |
| Primus Management Limited | Private company limited by shares | Live |
| PRIMUS ASSET MANAGEMENT LIMITED | Private company limited by shares | Live |
| PRIMUS NATURAL RESOURCES COMPANY LIMITED | Private company limited by shares | Live |
| PRIMUS NETWORK SOLUTIONS LIMITED | Private company limited by shares | Dissolved |
| Primus Onsager Limited | | Live |
| PRIMUS PAPER PRODUCTS COMPANY LIMITED | Private company limited by shares | Live |
| Primus Quasineutrality Limited | | Live |
| PRIMUS REALTY LIMITED | Private company limited by shares | Live |
| Primus Riesz Limited | | Live |
| Primus Shubnikov Limited | | Live |
| Primus Solutions Limited | Private company limited by shares | Live |
| Primus Tonks Limited | | Live |
| PRIMUS VISION LIMITED | | Live |
| PRIMVS LIMITED | Private company limited by shares | Live |
| PRIMWORTH LIMITED | Private company limited by shares | Dissolved |