---
title: "DESEO LOCKING SYSTEMS LIMITED — Ownership Dossier"
canonical: https://whiteintel.dev/entity/d1523e5f-7a41-514b-8338-64e84d123468
json: https://whiteintel.dev/api/public/dossier/d1523e5f-7a41-514b-8338-64e84d123468
identifier: oo:GB-COH-08392005
jurisdiction: GB
risk: Low
source: WhiteIntel corporate-ownership graph
---

# DESEO LOCKING SYSTEMS LIMITED

**Type:** Company  
**Jurisdiction:** [GB](https://whiteintel.dev/jurisdictions/gb)  
**Identifier:** `oo:GB-COH-08392005`  
**Risk level:** Low  
**Canonical dossier:** https://whiteintel.dev/entity/d1523e5f-7a41-514b-8338-64e84d123468  
**Structured JSON / MCP:** https://whiteintel.dev/api/public/dossier/d1523e5f-7a41-514b-8338-64e84d123468  

## Ownership & control

### Owners / controllers

- **Mr Mark Christopher O'Sullivan** (beneficial owner) — 75% — https://whiteintel.dev/entity/25ba26f8-2efa-505d-9cb4-28a77dbf55fb
- **Mr Marcus O'Sullivan** (beneficial owner) — 50% — https://whiteintel.dev/entity/96037d2f-8af2-5588-afd7-6f4f58de62d8
- **Mr Marcus O'Sullivan** (beneficial owner) — 50% — https://whiteintel.dev/entity/67271324-b76a-5a70-a7ee-727cea8f1a05
- **BRISANT SECURE LTD** (beneficial owner) — 100% — https://whiteintel.dev/entity/dbd4e8e9-9f5a-55ea-aa08-f5e37bb9800a
- **Mr Marcus O'Sullivan** (beneficial owner) — 37.5% — https://whiteintel.dev/entity/4887be4d-a3a2-4ae5-83ee-db307493d623
- **Mr Marcus O'Sullivan** (beneficial owner) — 37.5% — https://whiteintel.dev/entity/a07d223a-90a2-4742-bd2a-5b716d8a4672
- **Mr Mark Christopher O'Sullivan** (beneficial owner) — 62.5% — https://whiteintel.dev/entity/4c0b8d3d-4169-4557-b3fd-80242f781d3b
- **BRISANT SECURE LTD** (beneficial owner) — 87.5% — https://whiteintel.dev/entity/dbd4e8e9-9f5a-55ea-aa08-f5e37bb9800a

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

A **70-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:** `08392005`
- **Status:** liquidation
- **Type:** ltd
- **Incorporated:** 2013-02-07
- **Registered office:** Ernst & Young Llp, 12 Wellington Place, Leeds, LS1 4AP
- **SIC:** 46150

### Officers

- BURBRIDGE, Conor — director · Irish · appointed 2025-08-12
- HANCOX, Pete — director · British · appointed 2025-08-12
- HARVEY, Kevin — director · British · appointed 2025-08-12
- DUTTON, Nicholas Gary — director · British · appointed 2024-01-05 · resigned 2025-08-12
- MANTEL, Annabel Claire — director · British · appointed 2024-01-05 · resigned 2025-08-12
- O'SULLIVAN, Marcus — director · British · appointed 2013-02-22 · resigned 2024-01-05
- O'SULLIVAN, Marcus — director · British · appointed 2013-02-07 · resigned 2013-02-21
- O'SULLIVAN, Mark Christopher — director · British · appointed 2015-06-23 · resigned 2024-01-05
- O'SULLIVAN, Mark Christopher — director · British · appointed 2013-02-07 · resigned 2013-02-21
- STEWART, Stephen — director · British · appointed 2024-01-05 · resigned 2025-08-12

### Beneficial owners (Persons with Significant Control)

- [Brisant Secure Ltd](https://whiteintel.dev/entity/dbd4e8e9-9f5a-55ea-aa08-f5e37bb9800a) — 75–100% shares · corporate PSC · England — since 2024-01-05
- Mr Marcus O'Sullivan — 25–50% shares · individual PSC · United Kingdom — ceased 2024-01-05
- Mr Mark Christopher O'Sullivan — 50–75% shares · individual PSC · United Kingdom — ceased 2024-01-05
- Mr Marcus O'Sullivan — 25–50% shares · individual PSC · United Kingdom — ceased 2019-04-18

## Provenance

- companies_house_bulk — https://find-and-update.company-information.service.gov.uk/company/08392005
- OpenOwnership — https://find-and-update.company-information.service.gov.uk/company/08392005

---

_This is the markdown-for-agents view of the WhiteIntel dossier for **DESEO LOCKING SYSTEMS LIMITED**. Human view: https://whiteintel.dev/entity/d1523e5f-7a41-514b-8338-64e84d123468 · Structured JSON: https://whiteintel.dev/api/public/dossier/d1523e5f-7a41-514b-8338-64e84d123468._

_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"._