---
title: "Quest Diagnostics Subsidiary Holdings Limited — Ownership Dossier"
canonical: https://whiteintel.dev/entity/ebf86719-2a23-4bc0-b9e7-2bf16cebfcf2
json: https://whiteintel.dev/api/public/dossier/ebf86719-2a23-4bc0-b9e7-2bf16cebfcf2
identifier: gb-coh:09561965
jurisdiction: GB
risk: Low
source: WhiteIntel corporate-ownership graph
---

# Quest Diagnostics Subsidiary Holdings Limited

**Type:** Company  
**Jurisdiction:** [GB](https://whiteintel.dev/jurisdictions/gb)  
**Identifier:** `gb-coh:09561965`  
**Risk level:** Low  
**Canonical dossier:** https://whiteintel.dev/entity/ebf86719-2a23-4bc0-b9e7-2bf16cebfcf2  
**Structured JSON / MCP:** https://whiteintel.dev/api/public/dossier/ebf86719-2a23-4bc0-b9e7-2bf16cebfcf2  

## Ownership & control

### Holdings / subsidiaries

- **Q SQUARED SOLUTIONS CHINA (QUEST) LIMITED** (beneficial owner) — 87.5% — https://whiteintel.dev/entity/c9eccbe7-3aa8-5d2a-a684-5b54c58daf66
- **Q SQUARED SOLUTIONS HOLDINGS LIMITED** (beneficial owner) — 37.5% — https://whiteintel.dev/entity/287cd306-dfec-5cde-8ffc-f244b85380a4

## Company profile (live · UK Companies House)

- **Company number:** `09561965`
- **Status:** dissolved
- **Type:** ltd
- **Incorporated:** 2015-04-27
- **Registered office:** 1st Floor 48 Chancery Lane, London, WC2A 1JF, England
- **SIC:** 64209

### Officers

- O'SHAUGHNESSY, William Joseph — secretary · appointed 2015-07-28
- DEPPE, Michael Joseph — director · American · appointed 2020-11-12
- PATEL, Sandip R. — director · American · appointed 2018-11-04
- HUNKLER, Jacqueline — secretary · appointed 2015-04-27 · resigned 2015-07-28
- AHWIEH, Tina Eseroghene — director · British · appointed 2015-04-27 · resigned 2015-07-08
- BERRY, Paul Robert, Dr. — director · British · appointed 2015-04-27 · resigned 2015-07-08
- CALAMARI, Stephen Andrew — director · American · appointed 2015-04-27 · resigned 2020-05-06
- DE LEON CINCO, Teresa — director · Filipino · appointed 2015-04-27 · resigned 2018-11-04
- THOMAS, Lara Ann Leffler — director · American · appointed 2020-05-06 · resigned 2020-11-02
- THURLOW, Nicola Patricia — director · British · appointed 2015-04-27 · resigned 2015-07-08

### Beneficial owners (Persons with Significant Control)

- [Quest Diagnostics Holdings Limited](https://whiteintel.dev/entity/d2dde625-e283-5185-918c-b754d655a3a2) — 75–100% shares · corporate PSC · England — since 2016-04-06

## 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 **Quest Diagnostics Subsidiary Holdings Limited** — https://whiteintel.dev/entity/ebf86719-2a23-4bc0-b9e7-2bf16cebfcf2 · pricing https://whiteintel.dev/pricing.

---

_This is the markdown-for-agents view of the WhiteIntel dossier for **Quest Diagnostics Subsidiary Holdings Limited**. Human view: https://whiteintel.dev/entity/ebf86719-2a23-4bc0-b9e7-2bf16cebfcf2 · Structured JSON: https://whiteintel.dev/api/public/dossier/ebf86719-2a23-4bc0-b9e7-2bf16cebfcf2._

_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"._