---
title: "Upstream Bio, Inc. — Ownership Dossier"
canonical: https://whiteintel.dev/entity/d4a67260-0136-5e37-912a-3a65173d819d
json: https://whiteintel.dev/api/public/dossier/d4a67260-0136-5e37-912a-3a65173d819d
identifier: sec:0002022626
jurisdiction: US
risk: Medium
source: WhiteIntel corporate-ownership graph
---

# Upstream Bio, Inc.

**Type:** Company  
**Jurisdiction:** [US](https://whiteintel.dev/jurisdictions/us)  
**Identifier:** `sec:0002022626`  
**Risk level:** Medium  
**Canonical dossier:** https://whiteintel.dev/entity/d4a67260-0136-5e37-912a-3a65173d819d  
**Structured JSON / MCP:** https://whiteintel.dev/api/public/dossier/d4a67260-0136-5e37-912a-3a65173d819d  

## Ownership & control

### Owners / controllers

- **CHIMOVITS EREZ** (tenpercentowner) — https://whiteintel.dev/entity/e1891f27-e6e9-5fa1-a6ff-d022b54e2656
- **AI BIOTECHNOLOGY LLC** (tenpercentowner) — https://whiteintel.dev/entity/c32a59a6-cfc4-5f1b-a6a1-b7015cabe7c7
- **AI UPSTREAM LLC** (tenpercentowner) — https://whiteintel.dev/entity/592ce34f-3eb9-5211-8622-54ff959d1d36
- **OrbiMed Capital GP VIII LLC** (tenpercentowner) — https://whiteintel.dev/entity/e32a577b-cc76-57e1-b6c3-feb167072d33
- **BLAVATNIK LEN** (tenpercentowner) — https://whiteintel.dev/entity/9b09a8c6-eb8b-51ee-9fa0-e19ebc0e40cd
- **ACCESS INDUSTRIES MANAGEMENT, LLC** (tenpercentowner) — https://whiteintel.dev/entity/9fb42b6c-eda5-5b38-8e11-14b3a2f16081
- **ORBIMED ADVISORS LLC** (tenpercentowner) — https://whiteintel.dev/entity/4fe8d3ec-3487-5b04-877d-c8ddaf0718be
- **ORBIMED ISRAEL GP II, L.P.** (tenpercentowner) — https://whiteintel.dev/entity/7e720c1f-2995-5175-8f76-7259048a47f4
- **ACCESS INDUSTRIES HOLDINGS LLC** (tenpercentowner) — https://whiteintel.dev/entity/5162f642-f166-5707-a804-49404877246d
- **ORBIMED ADVISORS ISRAEL II LTD** (tenpercentowner) — https://whiteintel.dev/entity/454a1f8a-5117-55aa-9804-1fcfa06519f2
- **Wellington Biomedical Innovation Master Investors (Cayman) II L.P.** (tenpercentowner) — https://whiteintel.dev/entity/bacf0ebb-906d-54df-8b43-e2e45a68f462

### UBO chain (walk to the ultimate owner)

A **32-step** ownership/control chain to the ultimate beneficial owner is resolved for this entity. The full cited chain unlocks with a paid API key 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 **Upstream Bio, Inc.** — https://whiteintel.dev/entity/d4a67260-0136-5e37-912a-3a65173d819d · pricing https://whiteintel.dev/pricing.

---

_This is the markdown-for-agents view of the WhiteIntel dossier for **Upstream Bio, Inc.**. Human view: https://whiteintel.dev/entity/d4a67260-0136-5e37-912a-3a65173d819d · Structured JSON: https://whiteintel.dev/api/public/dossier/d4a67260-0136-5e37-912a-3a65173d819d._

_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"._