| OLIGO LIMITED | Private company limited by shares | Dissolved |
| Oligo Afrique Limited | | Live |
| OLIGO ASIA ENVIRONMENTAL GROUP LIMITED | Private company limited by shares | Live |
| OLIGO ASIA INFRASTRUCTURE GROUP LIMITED | Private company limited by shares | Live |
| OLIGO PARTNERS LIMITED | Private company limited by shares | Live |
| OLIGOCLASE LIMITED | | Live |
| OLIGOLD COMPANY LIMITED | Private company limited by shares | Dissolved |
| OLIGOLD HOLDING COMPANY LIMITED | Private company limited by shares | Live |
| OLIGOSENSITIVE LIMITED | Private company limited by shares | Live |