Fenwick & West


Fenwick & West LLP is a law firm of more than 470 attorneys with offices in Silicon Valley, San Francisco, Seattle, New York City, Santa Monica, Washington, DC, and Boston. The firm focuses on the technology and life sciences sectors, advising clients at all stages from startups to public companies. The firm's practice areas include capital markets, mergers and acquisitions, venture capital, patent, commercial litigation, and regulatory counseling.

History

William Fenwick, a graduate of Vanderbilt University Law School, formed Fenwick & West with three partners while an associate at Cleary Gottlieb. Early clients included Pioneer Electronics and Apple Computer, which the firm incorporated in 1974.
In 2024, the firm laid off associates and staff as venture activity slowed after a boom in the preceding years.
In 2025, Fenwick signed an amicus brief supporting law firm Perkins Coie after it and other law firms were targeted by the Trump administration.

Recognition

Fenwick & West ranked 69th on the 2025 AmLaw 100 list of the largest law firms by revenue.
Chambers and Partners recognized Fenwick's practice areas in startups, capital markets, artificial intelligence, and intellectual property.

Milestones

2022

2021

2020

  • Represented Amazon in the E.D. Texas, where a jury found that Amazon's Alexa-powered smart home devices did not infringe patents held by Innovation Sciences and that these patents were invalid
  • Represented OSIsoft, in real-time industrial data software and services, in its $5B acquisition by AVEVA, in industrial software.

2019

2014

2013

2012

  • Fenwick represents Facebook in its $1 billion purchase of Instagram
  • Fenwick represents Facebook in its IPO, the largest Internet IPO in U.S. history

2011

2000

Clients