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ThirtyFiveBio Limited

Oxford, GB · 4 known investors

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ThirtyFiveBio is a drug discovery company developing GPR35 antagonists to treat gastrointestinal diseases, with a focus on ulcerative colitis by targeting epithelial dysfunction. Founded in 2021, it operates as part of the Molecule to Medicine ecosystem and is advancing preclinical candidates toward first-in-human trials.

Founders & leadership

JWJames Westcott
James WestcottCEOJames Westcott is CEO of ThirtyFiveBio Limited, a drug discovery company developing GPR35 antagonists for gastrointestinal diseases. He has over 20 years of experience in drug discovery and previously served as Head of AbbVie Ventures Europe, where he evaluated early-stage preclinical investments in therapeutic programs.

Investors · 4

Also in the syndicate · 3

AbbVie VenturesCanaanMayewell Capital

Funding

SEC filings, press & company announcements
  • Undisclosed amountbridge roundApr 2025

    AbbVie Ventures, Canaan, Mayewell Capital

    Source ↗

Source: company announcements and press reports — follow each round's link for the claim.

Related companies · 2

Companies working in the same space as ThirtyFiveBio Limited.

Companies House · registry record

View on Companies House ↗
Registered name
THIRTYFIVEBIO LIMITED
Company number
13157735
Status
Active
Company type
Private limited company
Incorporated
26 Jan 2021
Registered office
99 Park Drive, Milton, Abingdon, OX14 4RY
Nature of business (SIC)
72110 — Research and experimental development on biotechnology
Accounts
last made up to 31 Dec 2025 · next due 30 Sept 2027
Confirmation statement
last made up to 25 Jan 2026 · next due 8 Feb 2027

Current officers · 6

  • Samantha Ann Harris — secretary, appointed 22 Jun 2022
  • Brenton Karl Ahrens — director, appointed 13 Apr 2021
  • Donmienne Doen Mun Leung — director, appointed 11 Mar 2025
  • Nils Lonberg — director, appointed 28 May 2021
  • Thomas David Mccarthy — director, appointed 26 Jan 2021
  • James Westcott — director, appointed 29 Jun 2021

Source: Companies House public register · retrieved 16 Aug 2026. Contains public sector information licensed under the Open Government Licence v3.0.

In the news

Frequently asked questions

What does ThirtyFiveBio Limited do?
ThirtyFiveBio is a drug discovery company developing GPR35 antagonists to treat gastrointestinal diseases, with a focus on ulcerative colitis by targeting epithelial dysfunction. Founded in 2021, it operates as part of the Molecule to Medicine ecosystem and is advancing preclinical candidates toward first-in-human trials.
Who are ThirtyFiveBio Limited's investors?
ThirtyFiveBio Limited's investors include Canaan Partners.
Where is ThirtyFiveBio Limited headquartered?
ThirtyFiveBio Limited is headquartered in Oxford, GB.