LAWYER PROFILE
Shylah Alfonso

Shylah Alfonso

USA 2026

Chambers ranking badge
Chambers ranking badge

Ranked in 1 practice area

About

Provided by Ashurst Perkins Coie – London, New York, Seattle, Sydney

USA

Practice Areas

Antitrust & Unfair Competition Litigation

Business Litigation

Class-Action Defense

Litigation

Trade Secrets

Trademark, Copyright, Internet & Advertising

Intellectual Property Law

Patent Litigation

Consumer Protection

Biotechnology & Pharmaceutical

Communications

Fintech & Payments

Medical Device

Retail & Consumer Products

Semiconductor

Artificial Intelligence & Machine Learning

Digital Media & Entertainment, Gaming & Sports

Immersive Technology

Interactive Entertainment

Regulated Gaming

Life Sciences & Healthcare

Career

Shylah Alfonso’s practice spans antitrust litigation, government investigations, and counseling; class-action and consumer protection litigation; merger clearance; and IP and FRAND disputes. She regularly leads large, cross-office, and cross-disciplinary teams on high-stakes matters involving novel legal and economic issues.

Shylah advises and represents multinational companies, including those entering or expanding into the U.S. market. Her experience spans matters before federal and state regulators and courts, including the FTC, the DOJ, state attorneys general, and private plaintiffs. She has represented clients across the supply chain—manufacturers, distributors, retailers, R&D companies, and patent portfolio holders—across a wide range of industries, including AI, telecommunications, social networking, big data, gaming, platform markets, semiconductors, software, agriscience, pharmaceuticals, manufacturing, retail, aerospace, and the internet. She is particularly known for her work at the intersection of antitrust and IP for technology-driven businesses.

In addition to litigation and investigations, Shylah provides strategic, pragmatic counseling and training on the antitrust implications of pricing practices, vertical restraints, distribution arrangements, IP acquisition and licensing, joint ventures, trade association and standard-setting participation, and other commercial transactions. She has represented market-leading companies across the technology, retail, telecommunications, and manufacturing sectors, bringing a business-focused approach to managing risk while enabling growth and innovation.

Representative clients include Microsoft, Amazon, Google, LinkedIn, Nintendo of America Inc., HTC, REI, Starbucks, Costco Wholesale Corporation, T-Mobile, and Simplot.

Chambers Review

Provided by Chambers

Chambers Guide to the USA

Antitrust - Washington

Band 1
Band 1

Individual Editorial
Chair of the firm's antitrust and unfair competition litigation practice Shylah Alfonso offers expert counsel in antitrust litigation as well as assistance with obtaining M&A clearance.

Strengths

Provided by Chambers

  • Shylah is exceptionally good across the gamut. She is among the best.

    AntitrustChambers Guide to the USA
  • I like that Shylah provides practical advice, simplifies and doesn't use big legal words. She makes it understandable to a lay person. That's great in a complex field like Antitrust.

    AntitrustChambers Guide to the USA

Ranked Individuals at Ashurst Perkins Coie – London, New York, Seattle, Sydney (218)

Alaska

Arizona

California

What success is built on

Chambers is the leading data and intelligence partner for the legal sector.

Explore thought leadership