---
title: "WILLEM SIJTHOFF — Ownership Dossier"
canonical: https://whiteintel.dev/entity/88ca0fa8-62f2-5fa1-8266-711aeb9f04dc
json: https://whiteintel.dev/api/public/dossier/88ca0fa8-62f2-5fa1-8266-711aeb9f04dc
identifier: icij:icijol-56100045
jurisdiction: DE
risk: Low
source: WhiteIntel corporate-ownership graph
---

# WILLEM SIJTHOFF

**Type:** Organization  
**Jurisdiction:** DE  
**Identifier:** `icij:icijol-56100045`  
**Risk level:** Low  
**Canonical dossier:** https://whiteintel.dev/entity/88ca0fa8-62f2-5fa1-8266-711aeb9f04dc  
**Structured JSON / MCP:** https://whiteintel.dev/api/public/dossier/88ca0fa8-62f2-5fa1-8266-711aeb9f04dc  

## Ownership & control

### Holdings / subsidiaries

- **DUYFKEN HOLDINGS LIMITED** (shareholder of) — https://whiteintel.dev/entity/e09bc6ea-d89c-51b1-8aa8-c192d787c267

## Provenance

- ICIJ Offshore Leaks — https://offshoreleaks.icij.org/nodes/56100045

---

_This is the markdown-for-agents view of the WhiteIntel dossier for **WILLEM SIJTHOFF**. Human view: https://whiteintel.dev/entity/88ca0fa8-62f2-5fa1-8266-711aeb9f04dc · Structured JSON: https://whiteintel.dev/api/public/dossier/88ca0fa8-62f2-5fa1-8266-711aeb9f04dc._

_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"._