# Mr Mark Andrew O'Brien

## Details

- **Born:** 9/1968
- **Nationality:** Canadian
- **Appointments:** 0 (0 active)
- **Control:** 2 holdings



## Control

| Company | Nature of control | Notified | Ceased |
|---|---|---|---|
| [Ultramagnetic Research Limited](/company/16812780) | ownership-of-shares-75-to-100-percent, voting-rights-75-to-100-percent, right-to-appoint-and-remove-directors | 27 Oct 2025 |  |
| [Cochengo Ltd](/company/16677445) | ownership-of-shares-25-to-50-percent, voting-rights-25-to-50-percent, right-to-appoint-and-remove-directors | 28 Aug 2025 |  |