---
title: "Mr John William Callaghan — Ownership Dossier"
canonical: https://whiteintel.dev/entity/b6f66fc7-91ca-554f-9449-cd6c54661bae
json: https://whiteintel.dev/api/public/dossier/b6f66fc7-91ca-554f-9449-cd6c54661bae
identifier: oo-person:GB-COH-PER-06007378-kWyM-bhrQO3Q3Jet0JpxC7plwII
jurisdiction: GB
risk: Low
source: WhiteIntel corporate-ownership graph
---

# Mr John William Callaghan

**Type:** Person  
**Jurisdiction:** [GB](https://whiteintel.dev/jurisdictions/gb)  
**Identifier:** `oo-person:GB-COH-PER-06007378-kWyM-bhrQO3Q3Jet0JpxC7plwII`  
**Risk level:** Low  
**Canonical dossier:** https://whiteintel.dev/entity/b6f66fc7-91ca-554f-9449-cd6c54661bae  
**Structured JSON / MCP:** https://whiteintel.dev/api/public/dossier/b6f66fc7-91ca-554f-9449-cd6c54661bae  

## Ownership & control

### Holdings / subsidiaries

- **HELIX SERVICE MANAGEMENT SERVICES LTD** (beneficial owner) — https://whiteintel.dev/entity/1a9f1744-048a-5a59-80ab-86d34d2d73f5

## Provenance

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

---

_This is the markdown-for-agents view of the WhiteIntel dossier for **Mr John William Callaghan**. Human view: https://whiteintel.dev/entity/b6f66fc7-91ca-554f-9449-cd6c54661bae · Structured JSON: https://whiteintel.dev/api/public/dossier/b6f66fc7-91ca-554f-9449-cd6c54661bae._

_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"._