Barbara Borden


I am passionate about helping clients execute on their strategic objectives and love negotiating deals.

Barbara Borden is co-chair of Cooley's M&A practice. She focuses on public and private M&A,  cross-border transactions, joint ventures and other complex transactions, and public securities law. Barbara represents strategic and financial buyers and sellers in public and private acquisitions and also has significant experience in counseling boards of directors in connection with M&A and related governance and anti-takeover matters.

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  • Meredith Agrees to Sell National Media Group to IAC’s Dotdash 

  • ZOLL Medical Agrees to Acquire Itamar Medical for $538 Million 

  • Vividion Therapeutics Agrees to Sell to Bayer for up to $2 Billion 

  • Prothena Agrees to Sell ATTR Amyloidosis Program to Novo Nordisk 

  • Horizon Therapeutics to Acquire Viela Bio 

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  • Arizona State University School of Law
    JD, magna cum laude, Order of the Coif, 1984

  • University of Virginia
    BA, Government
    with high distinction, 1981

Admissions & Credentials



  • American Bar Association

  • San Diego County Bar Association

Rankings & Accolades

    Best Lawyers in America: Lawyer of the Year (2018, 2021)

    Daily Journal: Top Women Lawyers (2017)

    Legal 500 US: Hall of Fame in M&A/corporate and commercial – M&A (2020 – 2021); Key Lawyer, Healthcare: Life Sciences

    The Recorder: Trusted Advisor for Life Sciences (2016)

    Daily Journal: Top 100 Lawyers in California (2014-2017)

    The Recorder: Women Leaders in Tech Law (2015-2018)

    San Diego M&A Advisor of the Year: Buy-Side Transaction (2015)

    The Best Lawyers in America: Lawyer of the Year, San Diego Securities and Capital markets (2014)

    Legal 500 US: Mergers, Acquisitions and Buyouts for Large Deals (2011-2018)

    The Best Lawyers in America: Corporate Governance and Compliance Law, Corporate Law, M&A, Securities Regulation and Securities/Capital Markets Law (2010-2021)

    Super Lawyers: Mergers and Acquisitions (2007-2019)