---
title: "BIOGUARD ENVIRONMENTAL LIMITED — Ownership Dossier"
canonical: https://whiteintel.dev/entity/1f99ca97-ae23-557b-ae95-202eeb242ceb
json: https://whiteintel.dev/api/public/dossier/1f99ca97-ae23-557b-ae95-202eeb242ceb
identifier: oo:GB-COH-NI056238
jurisdiction: GB
risk: Low
source: WhiteIntel corporate-ownership graph
---

# BIOGUARD ENVIRONMENTAL LIMITED

**Type:** Company  
**Jurisdiction:** [GB](https://whiteintel.dev/jurisdictions/gb)  
**Identifier:** `oo:GB-COH-NI056238`  
**Risk level:** Low  
**Canonical dossier:** https://whiteintel.dev/entity/1f99ca97-ae23-557b-ae95-202eeb242ceb  
**Structured JSON / MCP:** https://whiteintel.dev/api/public/dossier/1f99ca97-ae23-557b-ae95-202eeb242ceb  

## Ownership & control

### Owners / controllers

- **Dr Thomas James Black** (beneficial owner) — 50% — https://whiteintel.dev/entity/736de09e-1f21-5f66-8e6b-ec6d231ce734
- **Mr Mark Colvin** (beneficial owner) — 50% — https://whiteintel.dev/entity/5654dbf5-3b3b-5aa9-a2f3-296870024f26
- **Mr Mark Colvin** (beneficial owner) — 37.5% — https://whiteintel.dev/entity/d4b2ea6d-e30c-46c3-9247-442ba7480e16
- **Dr Thomas James Black** (beneficial owner) — 37.5% — https://whiteintel.dev/entity/1a92c039-d2a7-4f9a-b00f-05c84d5b80dc

### 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:** `NI056238`
- **Status:** active
- **Type:** ltd
- **Incorporated:** 2005-08-16
- **Registered office:** 4 The Rookery, Killinchy, Newtownards, County Down, BT23 6SY, Northern Ireland
- **SIC:** 74909

### Officers

- COLVIN, Mark — secretary · British · appointed 2007-04-24
- BLACK, Thomas James, Dr — director · British · appointed 2005-10-10
- COLVIN, Mark — director · British · appointed 2007-04-24
- BLACK, Carol — secretary · appointed 2005-10-10 · resigned 2007-04-24
- KANE, Dorothy May — secretary · British · appointed 2005-08-16 · resigned 2005-08-16
- DAWSON, Seamus — director · Irish · appointed 2005-08-16 · resigned 2005-10-10

### Beneficial owners (Persons with Significant Control)

- Dr Thomas James Black — 25–50% shares · individual PSC · Northern Ireland — since 2016-08-16
- Mr Mark Colvin — 25–50% shares · individual PSC · England — since 2016-08-16

## Provenance

- companies_house_bulk — https://find-and-update.company-information.service.gov.uk/company/NI056238
- OpenOwnership — https://find-and-update.company-information.service.gov.uk/company/NI056238

---

_This is the markdown-for-agents view of the WhiteIntel dossier for **BIOGUARD ENVIRONMENTAL LIMITED**. Human view: https://whiteintel.dev/entity/1f99ca97-ae23-557b-ae95-202eeb242ceb · Structured JSON: https://whiteintel.dev/api/public/dossier/1f99ca97-ae23-557b-ae95-202eeb242ceb._

_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"._