---
title: "HARBOUR NEWCO LIMITED — Ownership Dossier"
canonical: https://whiteintel.dev/entity/00cae0db-a6fb-48c1-9cd9-e9dd815babab
json: https://whiteintel.dev/api/public/dossier/00cae0db-a6fb-48c1-9cd9-e9dd815babab
identifier: gb-coh:17219325
jurisdiction: GB
risk: Low
source: WhiteIntel corporate-ownership graph
---

# HARBOUR NEWCO LIMITED

**Type:** Company  
**Jurisdiction:** GB  
**Identifier:** `gb-coh:17219325`  
**Risk level:** Low  
**Canonical dossier:** https://whiteintel.dev/entity/00cae0db-a6fb-48c1-9cd9-e9dd815babab  
**Structured JSON / MCP:** https://whiteintel.dev/api/public/dossier/00cae0db-a6fb-48c1-9cd9-e9dd815babab  

## Ownership & control

### Owners / controllers

- **THE UNDERWRITING EXCHANGE LIMITED** (beneficial owner) — 87.5% — https://whiteintel.dev/entity/dcc78608-50c2-5e36-bea3-837178c8be1b

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

1. **THE UNDERWRITING EXCHANGE LIMITED** — beneficial owner 87.5% → *HARBOUR NEWCO LIMITED*
2. **Mr Stephen Patrick O'Connor** — beneficial owner 50% → *THE UNDERWRITING EXCHANGE LIMITED*
2. **Mr Adrian Michael Butler** — beneficial owner 50% → *THE UNDERWRITING EXCHANGE LIMITED*
2. **SPECIALIST RISK INVESTMENTS LIMITED** — beneficial owner 100% → *THE UNDERWRITING EXCHANGE LIMITED*
2. **SPECIALIST RISK GROUP LIMITED** — beneficial owner 100% → *THE UNDERWRITING EXCHANGE LIMITED*
2. **Mr Adrian Michael Butler** — beneficial owner 37.5% → *THE UNDERWRITING EXCHANGE LIMITED*
2. **Mr Stephen Patrick O'Connor** — beneficial owner 37.5% → *THE UNDERWRITING EXCHANGE LIMITED*
2. **SPECIALIST RISK INVESTMENTS LIMITED** — beneficial owner 87.5% → *THE UNDERWRITING EXCHANGE LIMITED*
2. **SPECIALIST RISK GROUP LIMITED** — beneficial owner 87.5% → *THE UNDERWRITING EXCHANGE LIMITED*
3. **SATURN UK BIDCO LIMITED** — beneficial owner 100% → *SPECIALIST RISK INVESTMENTS LIMITED*
3. **PSC NOMINEE 3 LIMITED** — beneficial owner 100% → *SPECIALIST RISK INVESTMENTS LIMITED*
3. **SATURN UK BIDCO LIMITED** — beneficial owner 87.5% → *SPECIALIST RISK INVESTMENTS LIMITED*
3. **PSC NOMINEE 3 LIMITED** — beneficial owner 87.5% → *SPECIALIST RISK INVESTMENTS LIMITED*
3. **SPARTA UK BIDCO LIMITED** — beneficial owner 87.5% → *SPECIALIST RISK INVESTMENTS LIMITED*
3. **SPECIALIST RISK MIDCO LIMITED** — beneficial owner 100% → *SPECIALIST RISK GROUP LIMITED*
3. **SPECIALIST RISK MIDCO LIMITED** — beneficial owner 87.5% → *SPECIALIST RISK GROUP LIMITED*
4. **SATURN UK MIDCO LIMITED** — beneficial owner 100% → *SATURN UK BIDCO LIMITED*
4. **SATURN UK MIDCO LIMITED** — beneficial owner 87.5% → *SATURN UK BIDCO LIMITED*
4. **SPARTA UK MIDCO 2 LIMITED** — beneficial owner 100% → *SPARTA UK BIDCO LIMITED*
4. **SPARTA UK MIDCO 2 LIMITED** — beneficial owner 87.5% → *SPARTA UK BIDCO LIMITED*
4. **SPECIALIST RISK INVESTMENTS LIMITED** — beneficial owner 100% → *SPECIALIST RISK MIDCO LIMITED*
4. **SPECIALIST RISK INVESTMENTS LIMITED** — beneficial owner 87.5% → *SPECIALIST RISK MIDCO LIMITED*
4. **Ms Lindsey Villon Mcmurray** — beneficial owner 75% → *PSC NOMINEE 3 LIMITED*
4. **Ms Lindsey Villon Mcmurray** — beneficial owner 62.5% → *PSC NOMINEE 3 LIMITED*
5. **SPARTA UK MIDCO 1 LIMITED** — beneficial owner 100% → *SPARTA UK MIDCO 2 LIMITED*
5. **SPARTA UK MIDCO 1 LIMITED** — beneficial owner 87.5% → *SPARTA UK MIDCO 2 LIMITED*
5. **SATURN UK PIKCO LIMITED** — beneficial owner 100% → *SATURN UK MIDCO LIMITED*
5. **SATURN UK PIKCO LIMITED** — beneficial owner 87.5% → *SATURN UK MIDCO LIMITED*
6. **SATURN UK CLEANCO LIMITED** — beneficial owner 100% → *SATURN UK PIKCO LIMITED*
6. **SATURN UK CLEANCO LIMITED** — beneficial owner 87.5% → *SATURN UK PIKCO LIMITED*

## Company profile (live · UK Companies House)

- **Company number:** `17219325`
- **Status:** Active
- **Type:** Private Limited Company
- **Incorporated:** 2026-05-14
- **Registered office:** 7TH FLOOR THE ST BOTOLPH BUILDING, 138 HOUNDSDITCH, LONDON, EC3A 7AW
- **SIC:** 65120 - Non-life insurance

## Provenance

- companies_house_bulk — https://find-and-update.company-information.service.gov.uk/company/17219325

---

_This is the markdown-for-agents view of the WhiteIntel dossier for **HARBOUR NEWCO LIMITED**. Human view: https://whiteintel.dev/entity/00cae0db-a6fb-48c1-9cd9-e9dd815babab · Structured JSON: https://whiteintel.dev/api/public/dossier/00cae0db-a6fb-48c1-9cd9-e9dd815babab._

_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"._