---
title: "Mayo - John C — Ownership Dossier"
canonical: https://whiteintel.dev/entity/3e748697-78db-5cf0-80ca-9b9288b72a8b
json: https://whiteintel.dev/api/public/dossier/3e748697-78db-5cf0-80ca-9b9288b72a8b
identifier: icij:icijol-80099550
jurisdiction: GB
risk: High
source: WhiteIntel corporate-ownership graph
---

# Mayo - John C

**Type:** Organization  
**Jurisdiction:** [GB](https://whiteintel.dev/jurisdictions/gb)  
**Identifier:** `icij:icijol-80099550`  
**Risk level:** High  
**Canonical dossier:** https://whiteintel.dev/entity/3e748697-78db-5cf0-80ca-9b9288b72a8b  
**Structured JSON / MCP:** https://whiteintel.dev/api/public/dossier/3e748697-78db-5cf0-80ca-9b9288b72a8b  

## Ownership & control

### Holdings / subsidiaries

- **Celtic Pharma GP Ltd.** (director of) — https://whiteintel.dev/entity/e5c19e3a-06bc-5ca3-946c-74b46448dac0
- **Celtic Pharma GP Ltd.** (is signatory for) — https://whiteintel.dev/entity/e5c19e3a-06bc-5ca3-946c-74b46448dac0
- **Celtic Pharma GP Ltd.** (shareholder of) — https://whiteintel.dev/entity/e5c19e3a-06bc-5ca3-946c-74b46448dac0
- **Celtic Pharma Management Limited** (chief executive officer of) — https://whiteintel.dev/entity/ccc28292-7b45-5663-83b0-44741bfac3a5
- **Celtic Pharma Management Limited** (director of) — https://whiteintel.dev/entity/ccc28292-7b45-5663-83b0-44741bfac3a5
- **Celtic Pharma Management Limited** (shareholder of) — https://whiteintel.dev/entity/ccc28292-7b45-5663-83b0-44741bfac3a5
- **Celtic Pharma General L.P.** (shareholder of) — https://whiteintel.dev/entity/daa09f37-cb26-55c2-bb71-58e8e18ae1e8
- **Celtic Pharma Development Services Bermuda Ltd.** (chief executive officer of) — https://whiteintel.dev/entity/219fcbf8-c915-5fc2-9fa9-a30be11c7279
- **Celtic Pharma Development Services Bermuda Ltd.** (director of) — https://whiteintel.dev/entity/219fcbf8-c915-5fc2-9fa9-a30be11c7279
- **Celtic Pharma Development Services Bermuda Ltd.** (is signatory for) — https://whiteintel.dev/entity/219fcbf8-c915-5fc2-9fa9-a30be11c7279
- **Celtic Pharma Development Services Bermuda Ltd.** (vice-president of) — https://whiteintel.dev/entity/219fcbf8-c915-5fc2-9fa9-a30be11c7279
- **Neutron Ltd.** (chairman of) — https://whiteintel.dev/entity/726f9d34-7750-5aae-b0a9-d4f3ee979564

…and **53** more subsidiaries/holdings. Resolve the full list with `get_dossier` on the WhiteIntel MCP (`npx -y @whiteintel/mcp-server`) or a one-off dossier — https://whiteintel.dev/pricing.

## Provenance

- ICIJ Offshore Leaks — https://offshoreleaks.icij.org/nodes/80099550

## Get the full, resolved dossier (agent-callable)

The above is the free teaser. The resolved **multi-hop UBO chain**, ownership **%**, full **financial history**, itemised **assets** and the hop-by-hop **exposure path** are the paid depth — callable as tools from your agent:

```bash
npx -y @whiteintel/mcp-server   # then: get_dossier · trace_ownership_path · check_offshore_exposure
```

Or unlock a one-off cited dossier for **Mayo - John C** — https://whiteintel.dev/entity/3e748697-78db-5cf0-80ca-9b9288b72a8b · pricing https://whiteintel.dev/pricing.

---

_This is the markdown-for-agents view of the WhiteIntel dossier for **Mayo - John C**. Human view: https://whiteintel.dev/entity/3e748697-78db-5cf0-80ca-9b9288b72a8b · Structured JSON: https://whiteintel.dev/api/public/dossier/3e748697-78db-5cf0-80ca-9b9288b72a8b._

_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"._