---
title: "WINTHROP PROPERTIES S.A. — Ownership Dossier"
canonical: https://whiteintel.dev/entity/0252fff2-ced5-5e9d-b651-4b45f4f16d4c
json: https://whiteintel.dev/api/public/dossier/0252fff2-ced5-5e9d-b651-4b45f4f16d4c
identifier: icij:icijol-10134340
jurisdiction: CH
risk: Medium
source: WhiteIntel corporate-ownership graph
---

# WINTHROP PROPERTIES S.A.

**Type:** Company  
**Jurisdiction:** CH  
**Identifier:** `icij:icijol-10134340`  
**Risk level:** Medium  
**Canonical dossier:** https://whiteintel.dev/entity/0252fff2-ced5-5e9d-b651-4b45f4f16d4c  
**Structured JSON / MCP:** https://whiteintel.dev/api/public/dossier/0252fff2-ced5-5e9d-b651-4b45f4f16d4c  

## Ownership & control

### Owners / controllers

- **Seymour Trust Company Limited as trustee of the Winthrop Trust** (shareholder of) — https://whiteintel.dev/entity/55051f2b-3e7c-5be8-ab85-454d6bd15958
- **BROTHERHOOD FOUNDATION** (shareholder of) — https://whiteintel.dev/entity/28e2d466-3cd5-51f4-87da-0abf67304d17
- **THE REGENT TRUST COMPANY LIMITED** (shareholder of) — https://whiteintel.dev/entity/a2942b30-a4fa-5b5f-9a2c-ddfb35da9cd3
- **Mr. Jean Michel Bordes** (shareholder of) — https://whiteintel.dev/entity/ad7d168d-4eb7-5325-bbbc-1d379067d3a6
- **MRS. ANNEMARIE TOMASELLI** (shareholder of) — https://whiteintel.dev/entity/9cd8bb86-a999-5b61-a73d-482da4feaff3

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

A **5-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.

## Exposure (derived from the ownership graph)

**3** owners upstream in this entity's ownership/control chain are flagged — a sanctions hit or a secrecy jurisdiction — an investigative lead by resolved identity, not a legal determination. The contributing parties and the hop-by-hop path unlock with a paid API key or a one-off dossier — https://whiteintel.dev/pricing.

## Provenance

- ICIJ Offshore Leaks — https://offshoreleaks.icij.org/nodes/10134340

---

_This is the markdown-for-agents view of the WhiteIntel dossier for **WINTHROP PROPERTIES S.A.**. Human view: https://whiteintel.dev/entity/0252fff2-ced5-5e9d-b651-4b45f4f16d4c · Structured JSON: https://whiteintel.dev/api/public/dossier/0252fff2-ced5-5e9d-b651-4b45f4f16d4c._

_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"._