---
title: "Maciej Siemieniak — Ownership Dossier"
canonical: https://whiteintel.dev/entity/95079e3c-e01a-57ec-87e7-d1cd7265edf3
json: https://whiteintel.dev/api/public/dossier/95079e3c-e01a-57ec-87e7-d1cd7265edf3
identifier: oo-person:GB-COH-PER-14436221-VB9EKpgKAd3pc2t0AzNg_6Ohnas
jurisdiction: PL
risk: Low
source: WhiteIntel corporate-ownership graph
---

# Maciej Siemieniak

**Type:** Person  
**Jurisdiction:** [PL](https://whiteintel.dev/jurisdictions/pl)  
**Identifier:** `oo-person:GB-COH-PER-14436221-VB9EKpgKAd3pc2t0AzNg_6Ohnas`  
**Risk level:** Low  
**Canonical dossier:** https://whiteintel.dev/entity/95079e3c-e01a-57ec-87e7-d1cd7265edf3  
**Structured JSON / MCP:** https://whiteintel.dev/api/public/dossier/95079e3c-e01a-57ec-87e7-d1cd7265edf3  

## Ownership & control

### Holdings / subsidiaries

- **D&M DOORS AND WINDOWS LTD** (beneficial owner) — 50% — https://whiteintel.dev/entity/a30e5cba-d8d8-5c9d-a5e2-2574573876a3

## Provenance

- OpenOwnership — https://www.openownership.org

---

_This is the markdown-for-agents view of the WhiteIntel dossier for **Maciej Siemieniak**. Human view: https://whiteintel.dev/entity/95079e3c-e01a-57ec-87e7-d1cd7265edf3 · Structured JSON: https://whiteintel.dev/api/public/dossier/95079e3c-e01a-57ec-87e7-d1cd7265edf3._

_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"._