Sean Clayton


I partner with life sciences and technology companies to accomplish their general legal objectives, as well as guide them through financing transactions and public company reporting and compliance.

Sean Clayton heads Cooley’s San Diego corporate practice. Sean's practice focuses on the representation of public and private growth companies in general corporate matters, as well as a wide range of transactions, including public offerings, venture capital financings and M&A.

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  • Poseida Therapeutics Enters Research Collaboration With Takeda to Develop Novel Gene Therapies 

  • Flexion Therapeutics Agrees to Sell to Pacira BioSciences 

  • Erasca – $345 Million IPO 

  • Ambrx Biopharma – $126 Million IPO 

  • Singular Genomics Systems – $258 Million IPO 

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Don’t know how Cooley does it but they always pull out great attorneys to work with and you are certainly that. We really appreciate your knowledge, experience and counsel through this process. – CFO of IPO Client

  • Stanford Law School
    JD, Order of the Coif, 2003

  • University of California, San Diego
    BA, Political Science and Economics
    summa cum laude, Phi Beta Kappa, 2000

Admissions & Credentials