---
title: "JOHN MICHAEL WILLIAM COSTASCHUK — Ownership Dossier"
canonical: https://whiteintel.dev/entity/48e7297b-a38e-58cc-810a-2e8d76074ddd
json: https://whiteintel.dev/api/public/dossier/48e7297b-a38e-58cc-810a-2e8d76074ddd
jurisdiction: CY
source: WhiteIntel corporate-ownership graph
---

# JOHN MICHAEL WILLIAM COSTASCHUK

**Type:** Person  
**Jurisdiction:** CY  
**Canonical dossier:** https://whiteintel.dev/entity/48e7297b-a38e-58cc-810a-2e8d76074ddd  
**Structured JSON / MCP:** https://whiteintel.dev/api/public/dossier/48e7297b-a38e-58cc-810a-2e8d76074ddd  

## Ownership & control

### Holdings / subsidiaries

- **MYCOVENTURES INTERNATIONAL LTD** (Director) — https://whiteintel.dev/entity/c30176f7-4681-5942-a5a0-40c3c4fccd5f
- **MITHRIL EU HOLDINGS LTD** (Director) — https://whiteintel.dev/entity/69aae8b3-0bb6-54ad-a834-f921611a81ad
- **MITHRIL ROYALTIES LTD** (Director) — https://whiteintel.dev/entity/51f5f01c-cd0c-5c8d-a5cb-6d2ebb0e7185

## Provenance

- cyprus_drcor — https://data.gov.cy/en/dataset/1026

---

_This is the markdown-for-agents view of the WhiteIntel dossier for **JOHN MICHAEL WILLIAM COSTASCHUK**. Human view: https://whiteintel.dev/entity/48e7297b-a38e-58cc-810a-2e8d76074ddd · Structured JSON: https://whiteintel.dev/api/public/dossier/48e7297b-a38e-58cc-810a-2e8d76074ddd._

_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"._