---
title: "MPM BIOVENTURES 2018 (B), L.P. — Ownership Dossier"
canonical: https://whiteintel.dev/entity/3e64757c-e751-59c1-9603-3b1f796c0d5a
json: https://whiteintel.dev/api/public/dossier/3e64757c-e751-59c1-9603-3b1f796c0d5a
identifier: sec:0001729504
jurisdiction: US
risk: Low
source: WhiteIntel corporate-ownership graph
---

# MPM BIOVENTURES 2018 (B), L.P.

**Type:** Company  
**Jurisdiction:** [US](https://whiteintel.dev/jurisdictions/us)  
**Identifier:** `sec:0001729504`  
**Risk level:** Low  
**Canonical dossier:** https://whiteintel.dev/entity/3e64757c-e751-59c1-9603-3b1f796c0d5a  
**Structured JSON / MCP:** https://whiteintel.dev/api/public/dossier/3e64757c-e751-59c1-9603-3b1f796c0d5a  

## Ownership & control

### Holdings / subsidiaries

- **AKTIS ONCOLOGY, INC.** (tenpercentowner) — https://whiteintel.dev/entity/6782038c-0829-5ef3-9667-77e22dcc26b2
- **iTeos Therapeutics, Inc.** (other) — https://whiteintel.dev/entity/9c37386c-8a35-5e8c-8bfd-692c5ffb060a
- **Entrada Therapeutics, Inc.** (tenpercentowner) — https://whiteintel.dev/entity/e0c7be18-c4b5-5f24-b5ed-00ed7a9178b6
- **iTeos Therapeutics, Inc.** (tenpercentowner) — https://whiteintel.dev/entity/9c37386c-8a35-5e8c-8bfd-692c5ffb060a
- **Dyne Therapeutics, Inc.** (tenpercentowner) — https://whiteintel.dev/entity/6f3d0b50-7aa7-52a8-a2f9-11ef56e96f8c

---

_This is the markdown-for-agents view of the WhiteIntel dossier for **MPM BIOVENTURES 2018 (B), L.P.**. Human view: https://whiteintel.dev/entity/3e64757c-e751-59c1-9603-3b1f796c0d5a · Structured JSON: https://whiteintel.dev/api/public/dossier/3e64757c-e751-59c1-9603-3b1f796c0d5a._

_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"._