---
title: "CASTILIAN LTD. — Ownership Dossier"
canonical: https://whiteintel.dev/entity/f23e822d-bb03-593e-8be5-686cbf65bf30
json: https://whiteintel.dev/api/public/dossier/f23e822d-bb03-593e-8be5-686cbf65bf30
identifier: sec:0001724523
jurisdiction: US
risk: Low
source: WhiteIntel corporate-ownership graph
---

# CASTILIAN LTD.

**Type:** Company  
**Jurisdiction:** [US](https://whiteintel.dev/jurisdictions/us)  
**Identifier:** `sec:0001724523`  
**Risk level:** Low  
**Canonical dossier:** https://whiteintel.dev/entity/f23e822d-bb03-593e-8be5-686cbf65bf30  
**Structured JSON / MCP:** https://whiteintel.dev/api/public/dossier/f23e822d-bb03-593e-8be5-686cbf65bf30  

## Ownership & control

### Holdings / subsidiaries

- **SELLAS Life Sciences Group, Inc.** (tenpercentowner) — https://whiteintel.dev/entity/a0c28abc-fcde-583e-a7c2-ad64e18d0126

---

_This is the markdown-for-agents view of the WhiteIntel dossier for **CASTILIAN LTD.**. Human view: https://whiteintel.dev/entity/f23e822d-bb03-593e-8be5-686cbf65bf30 · Structured JSON: https://whiteintel.dev/api/public/dossier/f23e822d-bb03-593e-8be5-686cbf65bf30._

_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"._