---
title: "SENNOTT JOHN LANGTON JR — Ownership Dossier"
canonical: https://whiteintel.dev/entity/9cd692bd-87ba-59d5-8cc0-278516c36b64
json: https://whiteintel.dev/api/public/dossier/9cd692bd-87ba-59d5-8cc0-278516c36b64
identifier: sec:0001362376
jurisdiction: US
risk: Low
source: WhiteIntel corporate-ownership graph
---

# SENNOTT JOHN LANGTON JR

**Type:** Company  
**Jurisdiction:** [US](https://whiteintel.dev/jurisdictions/us)  
**Identifier:** `sec:0001362376`  
**Risk level:** Low  
**Canonical dossier:** https://whiteintel.dev/entity/9cd692bd-87ba-59d5-8cc0-278516c36b64  
**Structured JSON / MCP:** https://whiteintel.dev/api/public/dossier/9cd692bd-87ba-59d5-8cc0-278516c36b64  

## Ownership & control

### Holdings / subsidiaries

- **ATEGRITY SPECIALTY HOLDINGS LLC** (director) — https://whiteintel.dev/entity/a9c225c6-86e7-5b8c-a969-d5f1e835be52
- **ALLEGHANY CORP /DE** (officer) — https://whiteintel.dev/entity/2b593192-2c15-556d-af3b-e10e33a78ca1
- **ALLIED WORLD ASSURANCE CO HOLDINGS LTD** (officer) — https://whiteintel.dev/entity/f7544a2c-84b4-568b-9941-fbbedb78b14e
- **DARWIN PROFESSIONAL UNDERWRITERS INC** (officer) — https://whiteintel.dev/entity/20907035-3205-5fd9-a12b-954ed20c0e08
- **DARWIN PROFESSIONAL UNDERWRITERS INC** (director) — https://whiteintel.dev/entity/20907035-3205-5fd9-a12b-954ed20c0e08

## 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 **SENNOTT JOHN LANGTON JR** — https://whiteintel.dev/entity/9cd692bd-87ba-59d5-8cc0-278516c36b64 · pricing https://whiteintel.dev/pricing.

---

_This is the markdown-for-agents view of the WhiteIntel dossier for **SENNOTT JOHN LANGTON JR**. Human view: https://whiteintel.dev/entity/9cd692bd-87ba-59d5-8cc0-278516c36b64 · Structured JSON: https://whiteintel.dev/api/public/dossier/9cd692bd-87ba-59d5-8cc0-278516c36b64._

_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"._