---
title: "A1 HYDRO-STOP LIMITED — Ownership Dossier"
canonical: https://whiteintel.dev/entity/e0ec367f-191c-55f2-867d-bbb9f546b4aa
json: https://whiteintel.dev/api/public/dossier/e0ec367f-191c-55f2-867d-bbb9f546b4aa
identifier: oo:GB-COH-07521710
jurisdiction: GB
risk: Low
source: WhiteIntel corporate-ownership graph
---

# A1 HYDRO-STOP LIMITED

**Type:** Company  
**Jurisdiction:** [GB](https://whiteintel.dev/jurisdictions/gb)  
**Identifier:** `oo:GB-COH-07521710`  
**Risk level:** Low  
**Canonical dossier:** https://whiteintel.dev/entity/e0ec367f-191c-55f2-867d-bbb9f546b4aa  
**Structured JSON / MCP:** https://whiteintel.dev/api/public/dossier/e0ec367f-191c-55f2-867d-bbb9f546b4aa  

## Ownership & control

### Owners / controllers

- **Mr Mark Smith** (beneficial owner) — 100% — https://whiteintel.dev/entity/be8e941d-6032-5fd4-8cdd-949d66752546
- **Mr Mark Smith** (beneficial owner) — 87.5% — https://whiteintel.dev/entity/3ece34b1-78c0-4b72-a476-4c389ceabc4a

### 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:** `07521710`
- **Status:** active
- **Type:** ltd
- **Incorporated:** 2011-02-08
- **Registered office:** 8 Cleveland View, Cargo Fleet Lane, Middlesbrough, TS3 8NW, England
- **SIC:** 43999

## Financials (Companies House accounts)

| Figure | 2026-03-31 |
|---|---:|
| Net assets | £258 |
| Shareholder funds | £258 |
| Current assets | £577 |
| Employees | 0 |

_Latest filed period. Full 2-year history unlocks with a paid dossier — https://whiteintel.dev/pricing. As filed at Companies House._

### Officers

- SMITH, Mark — director · British · appointed 2011-07-12
- DAVIES, Elizabeth Ann — nominee director · British · appointed 2011-02-08 · resigned 2011-02-08
- SMITH, Peter — director · British · appointed 2011-02-08 · resigned 2011-07-12

### Beneficial owners (Persons with Significant Control)

- Mr Mark Smith — 75–100% shares · individual PSC · England — since 2017-01-08

## Provenance

- OpenOwnership — https://find-and-update.company-information.service.gov.uk/company/07521710
- companies_house_bulk — https://find-and-update.company-information.service.gov.uk/company/07521710
- companies_house_accounts — https://find-and-update.company-information.service.gov.uk/company/07521710/filing-history

---

_This is the markdown-for-agents view of the WhiteIntel dossier for **A1 HYDRO-STOP LIMITED**. Human view: https://whiteintel.dev/entity/e0ec367f-191c-55f2-867d-bbb9f546b4aa · Structured JSON: https://whiteintel.dev/api/public/dossier/e0ec367f-191c-55f2-867d-bbb9f546b4aa._

_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"._