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. Mr. Cogen 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.

Mr. Cogen's transactional experience includes over $100 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.

Mr. Cogen is ranked by Chambers USA as a “Band 2” lawyer in Northern California and a "Notable Practitioner" for Corporate Law/M&A in the Nationwide–Highly Regarded listings. The publication recognized him as “an excellent lawyer, partner and advisor, highly respected by company executives and board members” (2018); a “strategically brilliant practitioner who understands public M&A” (2016); and “an incredible negotiator who sees the big picture” (2013); uses “innovative, outside-the-box solutions” (2014); and is “incredibly balanced” (2017) and “fair and easy to deal with” (2013).

Mr. Cogen'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:
    • ​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
  • Elantec Semiconductor's $1.4 billion acquisition by Intersil Corporation

Mr. Cogen's life sciences transactions include:

  • 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

Mr. Cogen’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

Mr. Cogen 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.​​​​​​