---
title: "HAYDEN DONALD J JR — Ownership Dossier"
canonical: https://whiteintel.dev/entity/6dce0256-73f0-5235-b2ff-673133f67419
json: https://whiteintel.dev/api/public/dossier/6dce0256-73f0-5235-b2ff-673133f67419
identifier: sec:0001202285
jurisdiction: US
risk: Low
source: WhiteIntel corporate-ownership graph
---

# HAYDEN DONALD J JR

**Type:** Company  
**Jurisdiction:** [US](https://whiteintel.dev/jurisdictions/us)  
**Identifier:** `sec:0001202285`  
**Risk level:** Low  
**Canonical dossier:** https://whiteintel.dev/entity/6dce0256-73f0-5235-b2ff-673133f67419  
**Structured JSON / MCP:** https://whiteintel.dev/api/public/dossier/6dce0256-73f0-5235-b2ff-673133f67419  

## Ownership & control

### Holdings / subsidiaries

- **THESEUS PHARMACEUTICALS, INC.** (director) — https://whiteintel.dev/entity/d4fec44b-38d2-5d2c-be50-ac6cbffeae5e
- **REGENXBIO Inc.** (director) — https://whiteintel.dev/entity/52c0a915-b0b6-5f41-87ad-bd1b3f22992a
- **INSMED Inc** (director) — https://whiteintel.dev/entity/67c37aef-d9ff-5cb9-a23b-04e6bac986be
- **AMICUS THERAPEUTICS, INC.** (director) — https://whiteintel.dev/entity/e1a864b6-d6c1-58da-90b1-99f314115adb
- **CONCURRENT PHARMACEUTICALS INC** (director) — https://whiteintel.dev/entity/1d2fbb30-e6c4-545a-8635-c2b89d397937

## Get the full, resolved dossier (agent-callable)

The above is the free teaser. The resolved **multi-hop UBO chain**, ownership **%**, full **financial history**, itemised **assets** and the hop-by-hop **exposure path** are the paid depth — callable as tools from your agent:

```bash
npx -y @whiteintel/mcp-server   # then: get_dossier · trace_ownership_path · check_offshore_exposure
```

Or unlock a one-off cited dossier for **HAYDEN DONALD J JR** — https://whiteintel.dev/entity/6dce0256-73f0-5235-b2ff-673133f67419 · pricing https://whiteintel.dev/pricing.

---

_This is the markdown-for-agents view of the WhiteIntel dossier for **HAYDEN DONALD J JR**. Human view: https://whiteintel.dev/entity/6dce0256-73f0-5235-b2ff-673133f67419 · Structured JSON: https://whiteintel.dev/api/public/dossier/6dce0256-73f0-5235-b2ff-673133f67419._

_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"._