---
title: "QUARTZ HOLDCO LIMITED — Ownership Dossier"
canonical: https://whiteintel.dev/entity/edffd61f-681d-51eb-b2e6-154a0f046964
json: https://whiteintel.dev/api/public/dossier/edffd61f-681d-51eb-b2e6-154a0f046964
identifier: oo:GB-COH-NI691497
jurisdiction: GB
risk: Low
source: WhiteIntel corporate-ownership graph
---

# QUARTZ HOLDCO LIMITED

**Type:** Company  
**Jurisdiction:** [GB](https://whiteintel.dev/jurisdictions/gb)  
**Identifier:** `oo:GB-COH-NI691497`  
**Risk level:** Low  
**Canonical dossier:** https://whiteintel.dev/entity/edffd61f-681d-51eb-b2e6-154a0f046964  
**Structured JSON / MCP:** https://whiteintel.dev/api/public/dossier/edffd61f-681d-51eb-b2e6-154a0f046964  

## Ownership & control

### Owners / controllers

- **Errigal Contracts Group Limited** (beneficial owner) — 87.5% — https://whiteintel.dev/entity/9be7040e-8887-4454-8a2a-31ad59c393f0

### Holdings / subsidiaries

- **POTTER COWAN & COMPANY (BELFAST), LIMITED** (beneficial owner) — 87.5% — https://whiteintel.dev/entity/c0b1e15e-da22-5126-af38-df0c11dd5666

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

A **1-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:** `NI691497`
- **Status:** active
- **Type:** ltd
- **Incorporated:** 2022-09-30
- **Registered office:** 181 Pollys Brae Road, Dungiven, Londonderry, BT47 4NX, Northern Ireland
- **SIC:** 64209

### Officers

- MCCLOSKEY, Cormac Michael — director · Irish · appointed 2022-09-30
- TREANOR, Damien — director · Irish · appointed 2022-09-30

### Beneficial owners (Persons with Significant Control)

- [Errigal Contracts Group Limited](https://whiteintel.dev/entity/9be7040e-8887-4454-8a2a-31ad59c393f0) — 75–100% shares · corporate PSC · Ireland — since 2022-09-30

## Provenance

- OpenOwnership — https://find-and-update.company-information.service.gov.uk/company/NI691497
- companies_house_bulk — https://find-and-update.company-information.service.gov.uk/company/NI691497

## 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 **QUARTZ HOLDCO LIMITED** — https://whiteintel.dev/entity/edffd61f-681d-51eb-b2e6-154a0f046964 · pricing https://whiteintel.dev/pricing.

---

_This is the markdown-for-agents view of the WhiteIntel dossier for **QUARTZ HOLDCO LIMITED**. Human view: https://whiteintel.dev/entity/edffd61f-681d-51eb-b2e6-154a0f046964 · Structured JSON: https://whiteintel.dev/api/public/dossier/edffd61f-681d-51eb-b2e6-154a0f046964._

_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"._