---
title: "MASON MICHAEL — Ownership Dossier"
canonical: https://whiteintel.dev/entity/d54ef938-6cc4-53e2-87ea-2d4eb3067970
json: https://whiteintel.dev/api/public/dossier/d54ef938-6cc4-53e2-87ea-2d4eb3067970
identifier: sec:0001514291
jurisdiction: US
risk: Low
source: WhiteIntel corporate-ownership graph
---

# MASON MICHAEL

**Type:** Company  
**Jurisdiction:** [US](https://whiteintel.dev/jurisdictions/us)  
**Identifier:** `sec:0001514291`  
**Risk level:** Low  
**Canonical dossier:** https://whiteintel.dev/entity/d54ef938-6cc4-53e2-87ea-2d4eb3067970  
**Structured JSON / MCP:** https://whiteintel.dev/api/public/dossier/d54ef938-6cc4-53e2-87ea-2d4eb3067970  

## Ownership & control

### Holdings / subsidiaries

- **Karyopharm Therapeutics Inc.** (officer) — https://whiteintel.dev/entity/d3cdfe0f-33f7-546c-a301-1cfef18386a8
- **ALNYLAM PHARMACEUTICALS, INC.** (officer) — https://whiteintel.dev/entity/4b418581-d371-5444-94c4-d4cbdecc07b2

---

_This is the markdown-for-agents view of the WhiteIntel dossier for **MASON MICHAEL**. Human view: https://whiteintel.dev/entity/d54ef938-6cc4-53e2-87ea-2d4eb3067970 · Structured JSON: https://whiteintel.dev/api/public/dossier/d54ef938-6cc4-53e2-87ea-2d4eb3067970._

_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"._