

Shylah R. Alfonso
- Firmwide Chair, Antitrust & Unfair Competition Litigation Practice; Class Action Defense Practice
- Seattle
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Shylah is an innovative problem solver who delivers.
Shylah Alfonso assists clients in antitrust litigation and counseling, antitrust clearance for mergers and acquisitions, class action and complex commercial litigation, and intellectual property (IP) and fair, reasonable, and nondiscriminatory (FRAND) litigation. She thrives on complex matters and regularly leads large cross-office and cross-disciplinary teams.
Shylah works with multinational companies, including those looking to do business in the United States. She has represented manufacturers, distributors, retailers, research and development companies, and patent portfolio holders in matters implicating the Federal Trade Commission (FTC), the U.S. Department of Justice (DOJ), state attorneys general, and private litigants. Her industry experience includes telecommunications, social networking, big data, gaming, platform markets, semiconductors, computer software, pharmaceuticals, manufacturing, retail, the internet, and aerospace. She has particular experience working with technology companies on issues arising at the intersection of IP and antitrust.
Areas of focus
Industries
Services
Education & Credentials
Education
- University of Washington School of Law, J.D., with high honors, Associate Editor-In-Chief, Washington Law School Review, 2002
- University of Washington, B.A., Political Science/Society and Justice, 1998
Bar and Court Admissions
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Washington
- U.S. Court of Appeals for the Ninth Circuit
- U.S. District Court for the Western District of Washington
- U.S. District Court for the District of Colorado
- U.S. Court of Appeals for the Tenth Circuit
Related Employment
- Attorney General of Washington, Law Clerk, 2000
- Seattle Public Defender’s Office, WA, Intern Investigator, 1997
Professional Recognition
Listed in Chambers USA as "America's Leading Lawyer" for Antitrust Band 1, 2022-2024
Listed in Best Lawyers in America: Commercial Litigation; Litigation - Intellectual Property, 2024-2025
Listed in Washington Law and Politics, “Rising Stars of Washington Law”
Impact
Professional Leadership
- American Bar Association, Antitrust Law Section Leadership, Committee Operations, 2022-2024; Federal Civil Enforcement Committee, Co-Chair, 2018-2022; Vice-Chair, 2015-2018
- Washington State Bar Association, Consumer Protection, Antitrust and Unfair Business Practice Section, Chair, 2012-2014; Executive Committee, 2007-2010, 2011-2016
- National Partner Compensation Committee, Perkins Coie LLP, 2016-2021; Chair, 2018-2019
- National Partner Compensation Resource Committee, Perkins Coie LLP, 2018-2020; Chair, 2020-2022
- National Strategic Diversity Committee, Perkins Coie LLP, 2012-2018
- Washington Wine Commission, Board Member, 2018-present
- Washington Wine Institute, Vice President, 2010-2017
- National Associate and Counsel Evaluation Committee, Perkins Coie LLP, 2013-2016