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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  • Amryt Pharma to Sell to Chiesi Farmaceutici in $1.48 Billion Cross-Border Transaction  

  • Silence Therapeutics – $56.5 Million Registered Direct Offering 

  • Biote Agrees to Combine With SPAC Haymaker Acquisition Corp. III 

  • Alvotech Agrees to Merge With SPAC Oaktree Acquisition Corp. II 

  • Rent the Runway – $357 Million IPO 

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Claire was fantastic to work with. Not only is she extremely knowledgeable in capital markets transactions, she is also affable, easy to talk to and responsive. – Chambers UK, Capital Markets, 2023

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

Admissions & Credentials

England & Wales

Rankings & Accolades

    UK Legal 500 - Leading Individual - Equity Capital Markets (2023)