---
title: "Mr Mark Callahan — Ownership Dossier"
canonical: https://whiteintel.dev/entity/f6dee3ee-b982-41a5-9bf4-b5a12b3111d2
json: https://whiteintel.dev/api/public/dossier/f6dee3ee-b982-41a5-9bf4-b5a12b3111d2
identifier: psc:SJ4f_zGIkMptdtX67kgo9Mfawo4
jurisdiction: GB
risk: Low
source: WhiteIntel corporate-ownership graph
---

# Mr Mark Callahan

**Type:** Person  
**Jurisdiction:** [GB](https://whiteintel.dev/jurisdictions/gb)  
**Identifier:** `psc:SJ4f_zGIkMptdtX67kgo9Mfawo4`  
**Risk level:** Low  
**Canonical dossier:** https://whiteintel.dev/entity/f6dee3ee-b982-41a5-9bf4-b5a12b3111d2  
**Structured JSON / MCP:** https://whiteintel.dev/api/public/dossier/f6dee3ee-b982-41a5-9bf4-b5a12b3111d2  

## Ownership & control

### Holdings / subsidiaries

- **HYPERPLANES LTD** (beneficial owner) — 87.5% — https://whiteintel.dev/entity/5495b656-d307-546e-98d0-aed12c83a8b2

---

_This is the markdown-for-agents view of the WhiteIntel dossier for **Mr Mark Callahan**. Human view: https://whiteintel.dev/entity/f6dee3ee-b982-41a5-9bf4-b5a12b3111d2 · Structured JSON: https://whiteintel.dev/api/public/dossier/f6dee3ee-b982-41a5-9bf4-b5a12b3111d2._

_Risk levels are heuristic investigative leads, not legal determinations of beneficial ownership. Every claim carries a source; an absent edge means "not yet observed in current sources", not "does not exist"._