---
title: "Mr Mark Stephen Callister — Ownership Dossier"
canonical: https://whiteintel.dev/entity/a9badbc8-50ef-5e27-a9ae-974ce2bdf979
json: https://whiteintel.dev/api/public/dossier/a9badbc8-50ef-5e27-a9ae-974ce2bdf979
identifier: oo-person:GB-COH-PER-15555933-ap_zvqDdBWUDMDnaGWVSHvUdeAM
jurisdiction: GB
risk: Low
source: WhiteIntel corporate-ownership graph
---

# Mr Mark Stephen Callister

**Type:** Person  
**Jurisdiction:** [GB](https://whiteintel.dev/jurisdictions/gb)  
**Identifier:** `oo-person:GB-COH-PER-15555933-ap_zvqDdBWUDMDnaGWVSHvUdeAM`  
**Risk level:** Low  
**Canonical dossier:** https://whiteintel.dev/entity/a9badbc8-50ef-5e27-a9ae-974ce2bdf979  
**Structured JSON / MCP:** https://whiteintel.dev/api/public/dossier/a9badbc8-50ef-5e27-a9ae-974ce2bdf979  

## Ownership & control

### Holdings / subsidiaries

- **RMC INC LTD** (beneficial owner) — 100% — https://whiteintel.dev/entity/77bd6cb7-e0eb-5663-8dd7-16964aba4cf2

## Provenance

- OpenOwnership — https://www.openownership.org

---

_This is the markdown-for-agents view of the WhiteIntel dossier for **Mr Mark Stephen Callister**. Human view: https://whiteintel.dev/entity/a9badbc8-50ef-5e27-a9ae-974ce2bdf979 · Structured JSON: https://whiteintel.dev/api/public/dossier/a9badbc8-50ef-5e27-a9ae-974ce2bdf979._

_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"._