---
title: "Atlas Venture Associates Opportunity II, LP — Ownership Dossier"
canonical: https://whiteintel.dev/entity/c702f951-b855-5406-ab93-e654610d49d3
json: https://whiteintel.dev/api/public/dossier/c702f951-b855-5406-ab93-e654610d49d3
identifier: sec:0001935814
jurisdiction: US
risk: Low
source: WhiteIntel corporate-ownership graph
---

# Atlas Venture Associates Opportunity II, LP

**Type:** Person  
**Jurisdiction:** [US](https://whiteintel.dev/jurisdictions/us)  
**Identifier:** `sec:0001935814`  
**Risk level:** Low  
**Canonical dossier:** https://whiteintel.dev/entity/c702f951-b855-5406-ab93-e654610d49d3  
**Structured JSON / MCP:** https://whiteintel.dev/api/public/dossier/c702f951-b855-5406-ab93-e654610d49d3  

## Ownership & control

### Holdings / subsidiaries

- **Sionna Therapeutics, Inc.** (10% owner) — https://whiteintel.dev/entity/36003c1e-2a7d-5ea2-a95f-e01c345a874c
- **Sionna Therapeutics, Inc.** (10% owner) — https://whiteintel.dev/entity/36003c1e-2a7d-5ea2-a95f-e01c345a874c
- **Sionna Therapeutics, Inc.** (tenpercentowner) — https://whiteintel.dev/entity/36003c1e-2a7d-5ea2-a95f-e01c345a874c
- **Korro Bio, Inc.** (tenpercentowner) — https://whiteintel.dev/entity/71e9bcfd-4176-551b-b776-01b734a2fd82
- **Q32 Bio Inc.** (tenpercentowner) — https://whiteintel.dev/entity/08894b83-faf4-53f2-980d-374ae48ff38a
- **Disc Medicine, Inc.** (tenpercentowner) — https://whiteintel.dev/entity/6d317465-e113-5fee-9632-915c2579af2d
- **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 **Atlas Venture Associates Opportunity II, LP**. Human view: https://whiteintel.dev/entity/c702f951-b855-5406-ab93-e654610d49d3 · Structured JSON: https://whiteintel.dev/api/public/dossier/c702f951-b855-5406-ab93-e654610d49d3._

_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"._