---
title: "QUASTELS LLP — Ownership Dossier"
canonical: https://whiteintel.dev/entity/9409b075-ddb6-596f-80aa-1afdaadbd81a
json: https://whiteintel.dev/api/public/dossier/9409b075-ddb6-596f-80aa-1afdaadbd81a
identifier: oo:GB-COH-OC312541
jurisdiction: GB
risk: Low
source: WhiteIntel corporate-ownership graph
---

# QUASTELS LLP

**Type:** Company  
**Jurisdiction:** [GB](https://whiteintel.dev/jurisdictions/gb)  
**Identifier:** `oo:GB-COH-OC312541`  
**Risk level:** Low  
**Canonical dossier:** https://whiteintel.dev/entity/9409b075-ddb6-596f-80aa-1afdaadbd81a  
**Structured JSON / MCP:** https://whiteintel.dev/api/public/dossier/9409b075-ddb6-596f-80aa-1afdaadbd81a  

## Ownership & control

### Owners / controllers

- **Mr David Adam Quastel** (beneficial owner) — 50% — https://whiteintel.dev/entity/ab4e612b-10df-50d4-aa0a-288d52b281ca
- **Mr David Adam Quastel** (beneficial owner) — https://whiteintel.dev/entity/7df1dfcf-f371-44ff-acd2-e5d074247913
- **Mr David Adam Quastel** (beneficial owner) — https://whiteintel.dev/entity/44f2b2fe-2918-4fc4-97af-021a33f8b2a7
- **Mr Jonathan Paul Neilan** (beneficial owner) — https://whiteintel.dev/entity/66253049-93e8-4a5d-b9c9-9ca77abe618d

### Holdings / subsidiaries

- **SEQUEL ADVISORY LIMITED** (beneficial owner) — 37.5% — https://whiteintel.dev/entity/f7b0de7c-0ba9-413f-a5f2-d1e3c5c6b59e

### UBO chain (walk to the ultimate owner)

A **4-step** ownership/control chain to the ultimate beneficial owner is resolved for this entity. The full cited chain unlocks with a paid API key or a one-off dossier — https://whiteintel.dev/pricing.

## Company profile (live · UK Companies House)

- **Company number:** `OC312541`
- **Status:** active
- **Type:** llp
- **Incorporated:** 2005-04-04
- **Registered office:** Second Floor South, 55 Baker Street, London, W1U 8EW, England

### Officers

- NEILAN, Jonathan Paul — llp designated member · appointed 2005-05-01
- QUASTEL, David Adam — llp designated member · appointed 2005-04-04
- ABDULLAYEVA, Nargiz — llp member · appointed 2026-01-01
- BLAKE, Daniel Mark David — llp member · appointed 2023-05-01
- CONVISSER, Adam Thomas — llp member · appointed 2018-05-01
- CORNELIUS, Mark James — llp member · appointed 2019-05-01
- FRASER, Joshua Gerald — llp member · appointed 2024-04-01
- GALE, Ben John — llp member · appointed 2026-01-05
- GREENBERG, Jason Simon — llp member · appointed 2005-05-01
- GROSS, Jonathan Peter Lewis — llp member · appointed 2005-04-04
- GROSSOBEL, Simon Oren — llp member · appointed 2021-06-28
- JETHWA, Jayesh Sanjay — llp member · appointed 2023-02-06
- JONES, Naomi Mair — llp member · appointed 2022-12-05
- KLEMME, Thomas Albert Windsor — llp member · appointed 2025-11-10
- MALDE, Meera — llp member · appointed 2022-05-01
- ROSEN, Benjamin Oliver — llp member · appointed 2022-01-04
- SHAH, Dipti — llp member · appointed 2023-09-01
- TANG, Tracy Mei See — llp member · appointed 2025-11-06
- VALLINS, Charlotte Mary — llp member · appointed 2026-01-05
- HARINGMAN, Michael Stephan — llp designated member · appointed 2005-04-04 · resigned 2023-04-30

### Beneficial owners (Persons with Significant Control)

- Mr Jonathan Paul Neilan — 25–50% shares · individual PSC · England — since 2024-04-01
- Mr David Adam Quastel — 25–50% shares · individual PSC · England — since 2024-01-01
- Mr David Adam Quastel — 25–50% shares · individual PSC — ceased 2018-05-03

## Provenance

- OpenOwnership — https://find-and-update.company-information.service.gov.uk/company/OC312541
- companies_house_bulk — https://find-and-update.company-information.service.gov.uk/company/OC312541

---

_This is the markdown-for-agents view of the WhiteIntel dossier for **QUASTELS LLP**. Human view: https://whiteintel.dev/entity/9409b075-ddb6-596f-80aa-1afdaadbd81a · Structured JSON: https://whiteintel.dev/api/public/dossier/9409b075-ddb6-596f-80aa-1afdaadbd81a._

_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"._