---
title: "John James Arthur Hamer — Ownership Dossier"
canonical: https://whiteintel.dev/entity/01515361-3eb9-4084-87f5-e739a8e627b1
json: https://whiteintel.dev/api/public/dossier/01515361-3eb9-4084-87f5-e739a8e627b1
identifier: psc:zMAuuKe5Y_MOn31Kwy3aiWQX7SY
jurisdiction: GB
risk: Low
source: WhiteIntel corporate-ownership graph
---

# John James Arthur Hamer

**Type:** Person  
**Jurisdiction:** [GB](https://whiteintel.dev/jurisdictions/gb)  
**Identifier:** `psc:zMAuuKe5Y_MOn31Kwy3aiWQX7SY`  
**Risk level:** Low  
**Canonical dossier:** https://whiteintel.dev/entity/01515361-3eb9-4084-87f5-e739a8e627b1  
**Structured JSON / MCP:** https://whiteintel.dev/api/public/dossier/01515361-3eb9-4084-87f5-e739a8e627b1  

## Ownership & control

### Holdings / subsidiaries

- **TCP TOPCO (CALIFORNIA) LIMITED** (beneficial owner) — 87.5% — https://whiteintel.dev/entity/076c27fa-3831-50df-9491-ab51b53b7a94

---

_This is the markdown-for-agents view of the WhiteIntel dossier for **John James Arthur Hamer**. Human view: https://whiteintel.dev/entity/01515361-3eb9-4084-87f5-e739a8e627b1 · Structured JSON: https://whiteintel.dev/api/public/dossier/01515361-3eb9-4084-87f5-e739a8e627b1._

_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"._