aid: capstan-therapeutics
name: Capstan Therapeutics
description: 'Capstan Therapeutics was a clinical-stage biotechnology company based in San Diego,
  California, developing in vivo cell engineering medicines built on a proprietary targeted lipid
  nanoparticle (tLNP) platform that delivers mRNA and other RNA payloads to specific cell types inside
  the body. Its lead candidate CPTX2309 is an anti-CD19 in vivo CAR-T therapy in Phase 1 for B
  cell-mediated autoimmune disease, intended to achieve deep B cell depletion without lymphodepleting
  chemotherapy. AbbVie completed its acquisition of Capstan on 19 August 2025 for up to $2.1 billion.
  The company''s own domain now redirects to AbbVie and its DNS is served by AbbVie nameservers; it
  operates no developer program, public API, SDK, or machine-readable specification.'
url: https://raw.githubusercontent.com/api-evangelist/capstan-therapeutics/refs/heads/main/apis.yml
x-type: company
x-source: harvest:secondary-market
x-source-url: https://forgeglobal.com/capstan-therapeutics_stock/
x-tier: stub
x-tier-reason: harvest
specificationVersion: '0.23'
created: '2026-08-09'
modified: '2026-08-09'
tags:
- Company
- Biotechnology
- Pharmaceuticals
- Cell Therapy
- Immunology
- Life Sciences
- Acquired
apis: []
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Website
  url: https://capstantx.com/
x-enrichment:
  date: '2026-08-09'
  status: nochange
  artifacts_added: 0
  pass: local-v1
x-coverage:
  state: none
  reason: defunct
  detail: >-
    Capstan's own site is gone: capstantx.com 301s to www.abbvie.com/capstan-therapeutics.html and its
    nameservers are now ns1-4.abbviedns.com, following AbbVie's completed acquisition on 19 August 2025
    — the company was a clinical-stage biotech that never operated a developer program, GitHub org, or
    public API.
  evidence:
  - url: https://capstantx.com/
    status: 301
  - url: https://www.capstantx.com/
    status: 301
  - url: https://capstantx.com/.well-known/agent-card.json
    status: 403
  - url: https://capstantx.com/openapi.json
    status: 403
  - url: https://api.github.com/orgs/capstantx
    status: 404
  checked: '2026-08-09'