---
title: "MASON GREGORY A. — Ownership Dossier"
canonical: https://whiteintel.dev/entity/f1a14d0d-0bb9-5515-a353-e4c7cb23486b
json: https://whiteintel.dev/api/public/dossier/f1a14d0d-0bb9-5515-a353-e4c7cb23486b
identifier: sec:0001523605
jurisdiction: US
risk: Low
source: WhiteIntel corporate-ownership graph
---

# MASON GREGORY A.

**Type:** Company  
**Jurisdiction:** US  
**Identifier:** `sec:0001523605`  
**Risk level:** Low  
**Canonical dossier:** https://whiteintel.dev/entity/f1a14d0d-0bb9-5515-a353-e4c7cb23486b  
**Structured JSON / MCP:** https://whiteintel.dev/api/public/dossier/f1a14d0d-0bb9-5515-a353-e4c7cb23486b  

## Ownership & control

### Holdings / subsidiaries

- **WEBMD HEALTH CORP.** (officer) — https://whiteintel.dev/entity/0476f8b7-2371-5613-bf9a-bfc03dffa292

---

_This is the markdown-for-agents view of the WhiteIntel dossier for **MASON GREGORY A.**. Human view: https://whiteintel.dev/entity/f1a14d0d-0bb9-5515-a353-e4c7cb23486b · Structured JSON: https://whiteintel.dev/api/public/dossier/f1a14d0d-0bb9-5515-a353-e4c7cb23486b._

_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"._