---
title: "LEFF JONATHAN S — Ownership Dossier"
canonical: https://whiteintel.dev/entity/74870730-be49-5b01-8163-eb98c10bdaab
json: https://whiteintel.dev/api/public/dossier/74870730-be49-5b01-8163-eb98c10bdaab
identifier: sec:0001215242
jurisdiction: US
risk: Low
source: WhiteIntel corporate-ownership graph
---

# LEFF JONATHAN S

**Type:** Company  
**Jurisdiction:** [US](https://whiteintel.dev/jurisdictions/us)  
**Identifier:** `sec:0001215242`  
**Risk level:** Low  
**Canonical dossier:** https://whiteintel.dev/entity/74870730-be49-5b01-8163-eb98c10bdaab  
**Structured JSON / MCP:** https://whiteintel.dev/api/public/dossier/74870730-be49-5b01-8163-eb98c10bdaab  

## Ownership & control

### Holdings / subsidiaries

- **ALTUS PHARMACEUTICALS INC.** (tenpercentowner) — https://whiteintel.dev/entity/811aa943-09a9-53f5-a4bc-198bb79c9a2f
- **SUNESIS PHARMACEUTICALS INC** (director) — https://whiteintel.dev/entity/febc2d34-a6fa-5886-8edb-3883a966f115
- **ALTUS PHARMACEUTICALS INC.** (director) — https://whiteintel.dev/entity/811aa943-09a9-53f5-a4bc-198bb79c9a2f
- **SUNESIS PHARMACEUTICALS INC** (tenpercentowner) — https://whiteintel.dev/entity/febc2d34-a6fa-5886-8edb-3883a966f115
- **NEUROGEN CORP** (director) — https://whiteintel.dev/entity/c8486ba7-ad25-5aea-8a1c-de4d59b0404a
- **Larimar Therapeutics, Inc.** (director) — https://whiteintel.dev/entity/72e3523f-efab-5ee4-b03e-4139df749767
- **BiomX Inc.** (director) — https://whiteintel.dev/entity/01db328a-2c28-529d-960d-509fc7406f11
- **ARS Pharmaceuticals, Inc.** (director) — https://whiteintel.dev/entity/a9c00c55-4330-55f3-a417-febad978a7c8
- **Protara Therapeutics, Inc.** (director) — https://whiteintel.dev/entity/d54e2413-cebc-5e01-bc86-3b7d84bd9785
- **AVEXIS, INC.** (director) — https://whiteintel.dev/entity/6a9d98dd-e10f-5e1a-827f-3b8688801e85
- **ALPINE IMMUNE SCIENCES, INC.** (director) — https://whiteintel.dev/entity/ad945a36-f186-59fa-b801-2b39506284f6
- **INTERMUNE INC** (director) — https://whiteintel.dev/entity/3bdbe624-554a-50e2-a68d-0f706aaed56f

…and **5** more subsidiaries/holdings. Resolve the full list with `get_dossier` on the WhiteIntel MCP (`npx -y @whiteintel/mcp-server`) or a one-off dossier — https://whiteintel.dev/pricing.

## 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 **LEFF JONATHAN S** — https://whiteintel.dev/entity/74870730-be49-5b01-8163-eb98c10bdaab · pricing https://whiteintel.dev/pricing.

---

_This is the markdown-for-agents view of the WhiteIntel dossier for **LEFF JONATHAN S**. Human view: https://whiteintel.dev/entity/74870730-be49-5b01-8163-eb98c10bdaab · Structured JSON: https://whiteintel.dev/api/public/dossier/74870730-be49-5b01-8163-eb98c10bdaab._

_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"._