Claire Keast-Butler


I relish the opportunity to work with companies operating in a range of different sectors and investment banks on high profile and innovative capital markets transactions.

Claire Keast-Butler’s practice focuses on capital markets transactions. She represents issuers, investment banks and investors on initial public offerings and secondary offerings. She also regularly advises listed companies on corporate and securities law matters and corporate governance, and has considerable experience in public and private mergers and acquisitions and general corporate matters.

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  • Exscientia – $510.4 Million IPO 

  • Exscientia Inks Investment of up to $525 Million 

  • Immunocore $312.1 Million Aggregate Financing 

  • RenalytixAI – $85 Million IPO 

Claire Keast-Butler is described as very approachable, easy to talk to and very good on the technical side of things. – Chambers UK 2014

  • University College London
    LLB, Bachelors of Law
    Honors, 1998

Admissions & Credentials

England & Wales

Rankings & Accolades

    UK Legal 500 - Leading Individual - Equity Capital Markets (2022)