---
title: "Ruddy Marcella K. — Ownership Dossier"
canonical: https://whiteintel.dev/entity/cdc5f68f-bcb9-5cd6-af45-8faa595a91f5
json: https://whiteintel.dev/api/public/dossier/cdc5f68f-bcb9-5cd6-af45-8faa595a91f5
identifier: sec:0002023849
jurisdiction: US
risk: Medium
source: WhiteIntel corporate-ownership graph
---

# Ruddy Marcella K.

**Type:** Person  
**Jurisdiction:** [US](https://whiteintel.dev/jurisdictions/us)  
**Identifier:** `sec:0002023849`  
**Risk level:** Medium  
**Canonical dossier:** https://whiteintel.dev/entity/cdc5f68f-bcb9-5cd6-af45-8faa595a91f5  
**Structured JSON / MCP:** https://whiteintel.dev/api/public/dossier/cdc5f68f-bcb9-5cd6-af45-8faa595a91f5  

## Ownership & control

### Holdings / subsidiaries

- **Sionna Therapeutics, Inc.** (director) — https://whiteintel.dev/entity/36003c1e-2a7d-5ea2-a95f-e01c345a874c
- **Sionna Therapeutics, Inc.** (director) — https://whiteintel.dev/entity/36003c1e-2a7d-5ea2-a95f-e01c345a874c
- **Tectonic Therapeutic, Inc.** (officer) — https://whiteintel.dev/entity/f4637bbf-8499-5a1e-807a-1208124b3d8d
- **Sionna Therapeutics, Inc.** (director) — https://whiteintel.dev/entity/36003c1e-2a7d-5ea2-a95f-e01c345a874c
- **Upstream Bio, Inc.** (director) — https://whiteintel.dev/entity/d4a67260-0136-5e37-912a-3a65173d819d
- **Tectonic Therapeutic, Inc.** (officer) — https://whiteintel.dev/entity/f4637bbf-8499-5a1e-807a-1208124b3d8d

---

_This is the markdown-for-agents view of the WhiteIntel dossier for **Ruddy Marcella K.**. Human view: https://whiteintel.dev/entity/cdc5f68f-bcb9-5cd6-af45-8faa595a91f5 · Structured JSON: https://whiteintel.dev/api/public/dossier/cdc5f68f-bcb9-5cd6-af45-8faa595a91f5._

_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"._