# Mr Mark Callahan

## Details

- **Born:** 7/1981
- **Nationality:** British
- **Appointments:** 0 (0 active)
- **Control:** 4 holdings



## Control

| Company | Nature of control | Notified | Ceased |
|---|---|---|---|
| [Hyperplanes Ltd](/company/09457136) | ownership-of-shares-75-to-100-percent | 6 Apr 2016 | 3 Apr 2018 |
| [Gravicus Technologies Limited](/company/10523409) | significant-influence-or-control | 13 Dec 2016 | 20 Dec 2019 |
| [Clearalpha Ltd](/company/17054152) | ownership-of-shares-75-to-100-percent, voting-rights-75-to-100-percent, right-to-appoint-and-remove-directors | 25 Feb 2026 |  |
| [Hyperplanes Ltd](/company/09457136) | ownership-of-shares-25-to-50-percent, voting-rights-25-to-50-percent | 6 Apr 2016 |  |