---
title: "GMK INSTALLERS LTD — Ownership Dossier"
canonical: https://whiteintel.dev/entity/6dcb893c-5776-5e92-bb00-e02bd6b033c9
json: https://whiteintel.dev/api/public/dossier/6dcb893c-5776-5e92-bb00-e02bd6b033c9
identifier: oo:GB-COH-16115644
jurisdiction: GB
risk: Low
source: WhiteIntel corporate-ownership graph
---

# GMK INSTALLERS LTD

**Type:** Company  
**Jurisdiction:** GB  
**Identifier:** `oo:GB-COH-16115644`  
**Risk level:** Low  
**Canonical dossier:** https://whiteintel.dev/entity/6dcb893c-5776-5e92-bb00-e02bd6b033c9  
**Structured JSON / MCP:** https://whiteintel.dev/api/public/dossier/6dcb893c-5776-5e92-bb00-e02bd6b033c9  

## Ownership & control

### Owners / controllers

- **Mr Sylwester Alojzy Gruszka** (beneficial owner) — 100% — https://whiteintel.dev/entity/dc21c511-2133-50b0-aef5-c2627aaad0b5
- **Mr Sylwester Alojzy Gruszka** (beneficial owner) — 37.5% — https://whiteintel.dev/entity/e3cb42b6-e561-4ef8-9728-1daced67ff3d
- **Mr Jaroslaw Pawel Matkowski** (beneficial owner) — 37.5% — https://whiteintel.dev/entity/8eb95bc7-bea2-4c63-9c7b-5246eb90fbd0

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

1. **Mr Sylwester Alojzy Gruszka** — beneficial owner 100% → *GMK INSTALLERS LTD*
1. **Mr Sylwester Alojzy Gruszka** — beneficial owner 37.5% → *GMK INSTALLERS LTD*
1. **Mr Jaroslaw Pawel Matkowski** — beneficial owner 37.5% → *GMK INSTALLERS LTD*

## Company profile (live · UK Companies House)

- **Company number:** `16115644`
- **Status:** active
- **Type:** ltd
- **Incorporated:** 2024-12-03
- **Registered office:** 483 Green Lanes, London, N13 4BS, England
- **SIC:** 43342

### Officers

- MATKOWSKI, Jaroslaw Pawel — director · Polish · appointed 2024-12-05
- GRUSZKA, Sylwester Alojzy — director · Polish · appointed 2024-12-03 · resigned 2025-09-14

### Beneficial owners (Persons with Significant Control)

- Mr Jaroslaw Pawel Matkowski — 25–50% shares · individual PSC · England — since 2025-09-14
- Mr Sylwester Alojzy Gruszka — 25–50% shares · individual PSC · England — ceased 2025-09-14

## Provenance

- OpenOwnership — https://find-and-update.company-information.service.gov.uk/company/16115644
- companies_house_bulk — https://find-and-update.company-information.service.gov.uk/company/16115644

---

_This is the markdown-for-agents view of the WhiteIntel dossier for **GMK INSTALLERS LTD**. Human view: https://whiteintel.dev/entity/6dcb893c-5776-5e92-bb00-e02bd6b033c9 · Structured JSON: https://whiteintel.dev/api/public/dossier/6dcb893c-5776-5e92-bb00-e02bd6b033c9._

_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"._