---
title: "RA Capital Nexus Fund III, L.P. — Ownership Dossier"
canonical: https://whiteintel.dev/entity/44a9455f-c70a-5bf1-83b9-a98d8ddc565c
json: https://whiteintel.dev/api/public/dossier/44a9455f-c70a-5bf1-83b9-a98d8ddc565c
identifier: sec:0001883840
jurisdiction: US
risk: Medium
source: WhiteIntel corporate-ownership graph
---

# RA Capital Nexus Fund III, L.P.

**Type:** Person  
**Jurisdiction:** [US](https://whiteintel.dev/jurisdictions/us)  
**Identifier:** `sec:0001883840`  
**Risk level:** Medium  
**Canonical dossier:** https://whiteintel.dev/entity/44a9455f-c70a-5bf1-83b9-a98d8ddc565c  
**Structured JSON / MCP:** https://whiteintel.dev/api/public/dossier/44a9455f-c70a-5bf1-83b9-a98d8ddc565c  

## Cross-source identity

The same real-world entity, resolved across sources:

- **RA Capital Nexus Fund III, L.P.** — GLEIF · `lei:549300XS21LEPZSQBW39` — https://whiteintel.dev/entity/54d78d6d-ae93-5c23-a352-49f0da382588

## Ownership & control

### Holdings / subsidiaries

- **Mineralys Therapeutics, Inc.** (director) — https://whiteintel.dev/entity/ce1db34b-b2dd-51bb-8605-d58190624d9b
- **Mineralys Therapeutics, Inc.** (director) — https://whiteintel.dev/entity/ce1db34b-b2dd-51bb-8605-d58190624d9b
- **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
- **Sionna Therapeutics, Inc.** (director) — https://whiteintel.dev/entity/36003c1e-2a7d-5ea2-a95f-e01c345a874c
- **Septerna, Inc.** (director) — https://whiteintel.dev/entity/73a09cf2-416c-5ce7-8f3a-75597df4840f
- **Bicara Therapeutics Inc.** (director) — https://whiteintel.dev/entity/b1811ae6-3ec7-5e88-bd65-aa3d7ac6abd2
- **Climb Bio, Inc.** (director) — https://whiteintel.dev/entity/8ebdaa25-1d2c-5874-b059-7bbcc43083c6
- **FOG PHARMACEUTICALS, INC.** (director) — https://whiteintel.dev/entity/b329372d-d220-55fe-86a9-04133ff86476
- **Artiva Biotherapeutics, Inc.** (director) — https://whiteintel.dev/entity/f4e3723b-874a-5417-92c5-396aa264fb42
- **Climb Bio, Inc.** (tenpercentowner) — https://whiteintel.dev/entity/8ebdaa25-1d2c-5874-b059-7bbcc43083c6
- **SPYGLASS OPHTHALMICS, INC.** (director) — https://whiteintel.dev/entity/5e1fe159-faae-56de-abf1-40df3ed5be5c

…and **4** more subsidiaries/holdings. Resolve the full list with `get_dossier` on the WhiteIntel MCP (`npx -y @whiteintel/mcp-server`) 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 **RA Capital Nexus Fund III, L.P.** — https://whiteintel.dev/entity/44a9455f-c70a-5bf1-83b9-a98d8ddc565c · pricing https://whiteintel.dev/pricing.

---

_This is the markdown-for-agents view of the WhiteIntel dossier for **RA Capital Nexus Fund III, L.P.**. Human view: https://whiteintel.dev/entity/44a9455f-c70a-5bf1-83b9-a98d8ddc565c · Structured JSON: https://whiteintel.dev/api/public/dossier/44a9455f-c70a-5bf1-83b9-a98d8ddc565c._

_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"._