---
title: "QUANTA SERVICES HOLDING LTD — Ownership Dossier"
canonical: https://whiteintel.dev/entity/595d7157-e859-5ba8-b7d1-edde30378dd8
json: https://whiteintel.dev/api/public/dossier/595d7157-e859-5ba8-b7d1-edde30378dd8
identifier: oo:GB-COH-15207360
jurisdiction: GB
risk: Low
source: WhiteIntel corporate-ownership graph
---

# QUANTA SERVICES HOLDING LTD

**Type:** Company  
**Jurisdiction:** [GB](https://whiteintel.dev/jurisdictions/gb)  
**Identifier:** `oo:GB-COH-15207360`  
**Risk level:** Low  
**Canonical dossier:** https://whiteintel.dev/entity/595d7157-e859-5ba8-b7d1-edde30378dd8  
**Structured JSON / MCP:** https://whiteintel.dev/api/public/dossier/595d7157-e859-5ba8-b7d1-edde30378dd8  

## Ownership & control

### Owners / controllers

- **Mr Cein O Hanlon** (beneficial owner) — 100% — https://whiteintel.dev/entity/70273a02-945b-554f-8369-e62992d1e565
- **Mr Cein O Hanlon** (beneficial owner) — 87.5% — https://whiteintel.dev/entity/7ffee84e-e150-4eb2-b41f-a73fac9aa75e

### Holdings / subsidiaries

- **QUANTAWISE ACTUARIAL LLP** (beneficial owner) — https://whiteintel.dev/entity/f752db77-9ade-5568-a8f5-bf20d330db72

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

A **2-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:** `15207360`
- **Status:** dissolved
- **Type:** ltd
- **Incorporated:** 2023-10-12
- **Registered office:** 71-75 Shelton Street, Covent Garden, London, WC2H 9JQ, United Kingdom
- **SIC:** 96090

### Officers

- O HANLON, Cein — secretary · appointed 2023-10-12
- O HANLON, Cein — director · Irish · appointed 2023-10-12

### Beneficial owners (Persons with Significant Control)

- Mr Cein O Hanlon — 75–100% shares · individual PSC · Ireland — since 2023-10-12

## Provenance

- OpenOwnership — https://find-and-update.company-information.service.gov.uk/company/15207360

---

_This is the markdown-for-agents view of the WhiteIntel dossier for **QUANTA SERVICES HOLDING LTD**. Human view: https://whiteintel.dev/entity/595d7157-e859-5ba8-b7d1-edde30378dd8 · Structured JSON: https://whiteintel.dev/api/public/dossier/595d7157-e859-5ba8-b7d1-edde30378dd8._

_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"._