---
title: "HALPERN JOHN D — Ownership Dossier"
canonical: https://whiteintel.dev/entity/f0baef96-e828-5748-81c7-ac36b41f7014
json: https://whiteintel.dev/api/public/dossier/f0baef96-e828-5748-81c7-ac36b41f7014
identifier: sec:0001234950
jurisdiction: US
risk: Low
source: WhiteIntel corporate-ownership graph
---

# HALPERN JOHN D

**Type:** Company  
**Jurisdiction:** [US](https://whiteintel.dev/jurisdictions/us)  
**Identifier:** `sec:0001234950`  
**Risk level:** Low  
**Canonical dossier:** https://whiteintel.dev/entity/f0baef96-e828-5748-81c7-ac36b41f7014  
**Structured JSON / MCP:** https://whiteintel.dev/api/public/dossier/f0baef96-e828-5748-81c7-ac36b41f7014  

## Ownership & control

### Holdings / subsidiaries

- **COMERA LIFE SCIENCES HOLDINGS, INC.** (other) — https://whiteintel.dev/entity/9ed399fe-2437-5a59-955c-4d67779a846a
- **Eterna Therapeutics Inc.** (tenpercentowner) — https://whiteintel.dev/entity/20d41e06-2d69-5d5e-86bc-090d8771fb0e

## 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 **HALPERN JOHN D** — https://whiteintel.dev/entity/f0baef96-e828-5748-81c7-ac36b41f7014 · pricing https://whiteintel.dev/pricing.

---

_This is the markdown-for-agents view of the WhiteIntel dossier for **HALPERN JOHN D**. Human view: https://whiteintel.dev/entity/f0baef96-e828-5748-81c7-ac36b41f7014 · Structured JSON: https://whiteintel.dev/api/public/dossier/f0baef96-e828-5748-81c7-ac36b41f7014._

_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"._