---
title: "Sionna Therapeutics, Inc. — Ownership Dossier"
canonical: https://whiteintel.dev/entity/36003c1e-2a7d-5ea2-a95f-e01c345a874c
json: https://whiteintel.dev/api/public/dossier/36003c1e-2a7d-5ea2-a95f-e01c345a874c
identifier: sec:0002036042
jurisdiction: US
risk: High
source: WhiteIntel corporate-ownership graph
---

# Sionna Therapeutics, Inc.

**Type:** Company  
**Jurisdiction:** [US](https://whiteintel.dev/jurisdictions/us)  
**Identifier:** `sec:0002036042`  
**Risk level:** High  
**Canonical dossier:** https://whiteintel.dev/entity/36003c1e-2a7d-5ea2-a95f-e01c345a874c  
**Structured JSON / MCP:** https://whiteintel.dev/api/public/dossier/36003c1e-2a7d-5ea2-a95f-e01c345a874c  

## Ownership & control

### Owners / controllers

- **RA CAPITAL MANAGEMENT, L.P.** (10% owner) — https://whiteintel.dev/entity/8d389c12-372a-5782-93b3-6f36e07414df
- **Shah Rajeev M.** (10% owner) — https://whiteintel.dev/entity/fe8d7e01-c2f7-55ac-b8ce-308630592b3b
- **RA Capital Healthcare Fund LP** (10% owner) — https://whiteintel.dev/entity/1ef87f50-8834-5b13-90e0-d0c89201e433
- **Kolchinsky Peter** (10% owner) — https://whiteintel.dev/entity/33b3d577-9112-5c40-8586-a27dae0c41d4
- **TPG GP A, LLC** (10% owner) — https://whiteintel.dev/entity/10da51ae-d7ed-5ea0-ae1b-06941f96aee3
- **WINKELRIED JON** (10% owner) — https://whiteintel.dev/entity/7c7ce6b3-75ce-5322-bb07-0dc1be95f695
- **COULTER JAMES G** (10% owner) — https://whiteintel.dev/entity/1c9af5ce-4fa4-5f72-a7b2-3db4087e2cf4
- **Atlas Venture Fund XI, L.P.** (10% owner) — https://whiteintel.dev/entity/0d160e3e-733f-5ed2-9cf6-d2f6fa110037
- **Atlas Venture Associates XI, LLC** (10% owner) — https://whiteintel.dev/entity/8a09056a-29bd-5202-b79f-30dd1c1582c8
- **Atlas Venture Associates Opportunity II, LP** (10% owner) — https://whiteintel.dev/entity/c702f951-b855-5406-ab93-e654610d49d3
- **Atlas Venture Associates Opportunity II, LLC** (10% owner) — https://whiteintel.dev/entity/6627ceda-1fcb-53a5-b171-ca1ce464b105
- **Atlas Venture Opportunity Fund II, L.P.** (10% owner) — https://whiteintel.dev/entity/7cc46103-3e0c-503b-b03f-2c8aa4df1f81
- **Atlas Venture Associates XI, L.P.** (10% owner) — https://whiteintel.dev/entity/4565f9d1-8e59-5ad4-886b-4dfc4f63433e
- **TPG GP A, LLC** (10% owner) — https://whiteintel.dev/entity/10da51ae-d7ed-5ea0-ae1b-06941f96aee3
- **WINKELRIED JON** (10% owner) — https://whiteintel.dev/entity/7c7ce6b3-75ce-5322-bb07-0dc1be95f695
- **COULTER JAMES G** (10% owner) — https://whiteintel.dev/entity/1c9af5ce-4fa4-5f72-a7b2-3db4087e2cf4
- **Atlas Venture Associates Opportunity II, LLC** (10% owner) — https://whiteintel.dev/entity/6627ceda-1fcb-53a5-b171-ca1ce464b105
- **Atlas Venture Associates XI, L.P.** (10% owner) — https://whiteintel.dev/entity/4565f9d1-8e59-5ad4-886b-4dfc4f63433e
- **Atlas Venture Associates Opportunity II, LP** (10% owner) — https://whiteintel.dev/entity/c702f951-b855-5406-ab93-e654610d49d3
- **Atlas Venture Associates XI, LLC** (10% owner) — https://whiteintel.dev/entity/8a09056a-29bd-5202-b79f-30dd1c1582c8
- **Atlas Venture Fund XI, L.P.** (10% owner) — https://whiteintel.dev/entity/0d160e3e-733f-5ed2-9cf6-d2f6fa110037
- **Atlas Venture Opportunity Fund II, L.P.** (10% owner) — https://whiteintel.dev/entity/7cc46103-3e0c-503b-b03f-2c8aa4df1f81
- **Kolchinsky Peter** (10% owner) — https://whiteintel.dev/entity/33b3d577-9112-5c40-8586-a27dae0c41d4
- **Shah Rajeev M.** (10% owner) — https://whiteintel.dev/entity/fe8d7e01-c2f7-55ac-b8ce-308630592b3b
- **RA CAPITAL MANAGEMENT, L.P.** (10% owner) — https://whiteintel.dev/entity/8d389c12-372a-5782-93b3-6f36e07414df
- **RA Capital Healthcare Fund LP** (10% owner) — https://whiteintel.dev/entity/1ef87f50-8834-5b13-90e0-d0c89201e433
- **Kolchinsky Peter** (tenpercentowner) — https://whiteintel.dev/entity/33b3d577-9112-5c40-8586-a27dae0c41d4
- **RA CAPITAL MANAGEMENT, L.P.** (tenpercentowner) — https://whiteintel.dev/entity/8d389c12-372a-5782-93b3-6f36e07414df
- **RA Capital Healthcare Fund LP** (tenpercentowner) — https://whiteintel.dev/entity/1ef87f50-8834-5b13-90e0-d0c89201e433
- **Shah Rajeev M.** (tenpercentowner) — https://whiteintel.dev/entity/fe8d7e01-c2f7-55ac-b8ce-308630592b3b
- **TPG GP A, LLC** (tenpercentowner) — https://whiteintel.dev/entity/10da51ae-d7ed-5ea0-ae1b-06941f96aee3
- **WINKELRIED JON** (tenpercentowner) — https://whiteintel.dev/entity/7c7ce6b3-75ce-5322-bb07-0dc1be95f695
- **COULTER JAMES G** (tenpercentowner) — https://whiteintel.dev/entity/1c9af5ce-4fa4-5f72-a7b2-3db4087e2cf4
- **Atlas Venture Associates XI, L.P.** (tenpercentowner) — https://whiteintel.dev/entity/4565f9d1-8e59-5ad4-886b-4dfc4f63433e
- **Atlas Venture Opportunity Fund II, L.P.** (tenpercentowner) — https://whiteintel.dev/entity/7cc46103-3e0c-503b-b03f-2c8aa4df1f81
- **Atlas Venture Associates Opportunity II, LLC** (tenpercentowner) — https://whiteintel.dev/entity/6627ceda-1fcb-53a5-b171-ca1ce464b105
- **Atlas Venture Fund XI, L.P.** (tenpercentowner) — https://whiteintel.dev/entity/0d160e3e-733f-5ed2-9cf6-d2f6fa110037
- **Atlas Venture Associates XI, LLC** (tenpercentowner) — https://whiteintel.dev/entity/8a09056a-29bd-5202-b79f-30dd1c1582c8
- **Atlas Venture Associates Opportunity II, LP** (tenpercentowner) — https://whiteintel.dev/entity/c702f951-b855-5406-ab93-e654610d49d3

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

A **89-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.

---

_This is the markdown-for-agents view of the WhiteIntel dossier for **Sionna Therapeutics, Inc.**. Human view: https://whiteintel.dev/entity/36003c1e-2a7d-5ea2-a95f-e01c345a874c · Structured JSON: https://whiteintel.dev/api/public/dossier/36003c1e-2a7d-5ea2-a95f-e01c345a874c._

_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"._