---
title: "KETCHUM JOHN B — Ownership Dossier"
canonical: https://whiteintel.dev/entity/a99cbffb-192b-5480-aa53-c8b757b18bd8
json: https://whiteintel.dev/api/public/dossier/a99cbffb-192b-5480-aa53-c8b757b18bd8
identifier: sec:0001991806
jurisdiction: US
risk: Low
source: WhiteIntel corporate-ownership graph
---

# KETCHUM JOHN B

**Type:** Company  
**Jurisdiction:** [US](https://whiteintel.dev/jurisdictions/us)  
**Identifier:** `sec:0001991806`  
**Risk level:** Low  
**Canonical dossier:** https://whiteintel.dev/entity/a99cbffb-192b-5480-aa53-c8b757b18bd8  
**Structured JSON / MCP:** https://whiteintel.dev/api/public/dossier/a99cbffb-192b-5480-aa53-c8b757b18bd8  

## Ownership & control

### Holdings / subsidiaries

- **Tango Therapeutics, Inc.** (director) — https://whiteintel.dev/entity/6d4760cb-8ca3-5276-a9f6-f4d1e943f421

---

_This is the markdown-for-agents view of the WhiteIntel dossier for **KETCHUM JOHN B**. Human view: https://whiteintel.dev/entity/a99cbffb-192b-5480-aa53-c8b757b18bd8 · Structured JSON: https://whiteintel.dev/api/public/dossier/a99cbffb-192b-5480-aa53-c8b757b18bd8._

_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"._