Douglas N. Cogen

Co-Chair, Mergers & Acquisitions

Partner, Corporate  

San Francisco 415.875.2409


Doug Cogen concentrates his practice on mergers and acquisitions, strategic and commercial transactions, corporate counseling and governance, securities matters, shareholder activism and takeover defense. Doug is the co-chair of Fenwick & West’s M&A practice and served as a member of the firm’s Executive Committee for 10 years.

Doug's transactional experience includes over $125 billion of completed mergers, acquisitions and divestitures including cross-border transactions in the software, internet, life sciences, medical devices, telecommunications, networking, semiconductor, computer hardware and consumer products industries; public company tender offers; and private placements of equity and debt securities.

Doug is ranked by Chambers Global among the world’s leading lawyers for U.S. Corporate/M&A. He is also ranked by Chambers USA in Northern California and is recognized as a "Notable Practitioner" for Corporate/M&A in the Nationwide–Highly Regarded listings. The publication recognized him as: “fantastic,” helps clients “understand the legal aspect of a matter without the jargon” (2019); “an excellent lawyer, partner and advisor, highly respected by company executives and board members” (2018); “incredibly balanced” (2017); a “strategically brilliant practitioner who understands public M&A” (2016); uses “innovative, outside-the-box solutions” (2014); “an incredible negotiator who sees the big picture” and “fair and easy to deal with” (2013).

Doug's technology transactions include:

  • Over 125 deals for Cisco Systems, including the acquisitions of:
    • Scientific-Atlanta for $6.9 billion
    • NDS Group for $5 billion
    • AppDynamics for $3.7 billion​
    • WebEx Communications for $3.2 billion
    • Starent Networks for $2.9 billion
    • Sourcefire for $2.7 billion
    • Duo Security for $2.3 billion
    • BroadSoft for $1.9 billion
  • Multiple deals for Symantec, including:
    • Pending sale of its Enterprise Security business to Broadcom for $10.7B billion
    • ​Sale of the Veritas information management business to The Carlyle Group for $7.4 billion
    • Merger with Blue Coat for $4.65 billion
    • Acquisition of LifeLock for $2.3 billion
    • Sale of the website security solutions business to DigiCert
  • VeriSign's $21 billion merger with Network Solutions
  • Concur’s $8.3 billion acquisition by SAP
  • GitHub's $7.5 billion acquisition by Microsoft
  • Excite's $7.2 billion merger with @Home Corporation
  • NetScreen Technologies' $4.3 billion merger with Juniper Networks
  • Macromedia's $3.4 billion merger with Adobe Systems
  • ArcSight’s $1.5 billion acquisition by Hewlett-Packard
  • Elantec Semiconductor's $1.4 billion acquisition by Intersil Corporation

Doug's life sciences transactions include:

  • Loxo Oncology’s $8 billion acquisition by Eli Lilly
  • Cepheid’s $4 billion acquisition by Danaher Corporation​
  • Agilent Technologies’ $1.5 billion acquisition of Varian
  • Connetics' $930 million merger with Stiefel Laboratories
  • Vysis’ $365 million acquisition by Abbott Laboratories
  • Peplin’s $287.5 million acquisition by LEO Pharma
  • Agilent Technologies’ $250 million acquisition of Stratagene

Doug’s awards and recognitions include:

  • named 2018 Lawyer of the Year for technology and telecom dealmaking by The Deal
  • ranked one of the Top 100 Attorneys in the State of California by the Daily Journal in each of 2018, 2013 and 2006
  • included in The Legal 500 "Hall of Fame" in 2018 and named by The Legal 500 as a Leading Lawyer in the United States - M&A/Corporate in each of the last five years
  • named Finance Monthly's Deal Maker of the Year in both 2017 and 2015
  • named one of the Top 50 Global M&A Lawyers in 2014 and awarded the M&A Lawyer of the Year in 2010 by Global M&A Network
  • named an IFLR1000 Elite Dealmaker in 2018
  • named one of the Best Lawyers in America in Mergers & Acquisitions Law by Best Lawyers
  • named Northern California “Super Lawyer” in each of the last ten years 
  • named one of the Best Lawyers in the Bay Area by Bay Area Lawyer magazine
  • named Top Dealmaker-Lawyer by AlwaysOn and KPMG
  • named one of the 500 Leading Dealmakers in the United States by Lawdragon

Doug has served as Director of Intergovernmental Relations for the New York City Planning Commission. He has also lectured on transactional law at Columbia University Law School, Stanford University Law School and the Stanford Graduate School of Business.​​​​​​​​​​​​​​