Based in Brussels, May Lyn leads the European competition law practice. She advises on multi-jurisdictional transactions and complex competition matters, with deep experience designing and executing global merger control strategies. She regularly coordinates clearance efforts across multiple authorities, partnering closely with local counsel to secure efficient and timely approvals.
She also represents clients in cartel and antitrust investigations brought by the European Commission and other competition authorities, including the UK Competition and Markets Authority. Her recent work includes advising on preliminary and in-depth investigations under the EU Foreign Subsidies Regulation (FSR), advocating for international businesses as they navigate the EU’s expanding regulatory landscape while investing and growing in the region. Beyond enforcement, May Lyn regularly counsels on distribution issues and competitor collaborations, including in relation to the intersection between antitrust and ESG, standard-setting initiatives, data-gathering and information exchange.
May Lyn is the Chair of the Competition Section Advisory Committee of the Law Society of England & Wales. She has been recognized in Who’s Who Legal – Competition: Future Leaders (2019 – 2024), Global Competition Review’s ‘Women in Antitrust’ 2025 and Lexology’s Client Choice – Competition 2026. She is a qualified solicitor in England & Wales and is registered with the Irish and Brussels Bars.
Acting for several technology software companies on acquisitions in the software, cloud and AI spaces, and securing merger clearances around the world
Advising companies across various industries (including chemicals, manufacturing, transportation, energy, life sciences, consumer goods) on their global merger filing strategies
Advising a third party in the European Commission’s merger investigation of Illumina/Grail
Advising a third party in the European Commission’s merger investigation of Microsoft/Nuance
Advising a third party in the UK Competition and Market Authority’s merger investigation of Meta/Giphy
Defending an Asian company involved in an in-depth EU Foreign Subsidies Regulation investigation
Advising an Asian company involved in a preliminary EU Foreign Subsidies Regulation investigation
Advocating for a company during an on-site inspection by the European Commission in an EU Foreign Subsidies Regulation investigation
Advising several companies on preparing for notifications of transactions and public tenders under the EU Foreign Subsidies Regulation
Counseling several manufacturers on the competition law aspects of joint sustainability/ESG initiatives
Advising a company involved in the European Commission/ Swiss Competition Commission Consumer Fragrances investigation
Advising a company in the European Commission cartel investigation in the automotive sector
Advising a company in the European Commission’s End-of-Life vehicles cartel investigation
Advising a company in the European Commission’s Capacitors cartel investigation, and subsequent litigation before the EU Court
Advising two companies in the European Commission’s Maritime Car Carrier cartel investigation, and defending the clients in multiple parallel investigations by regulators around the world
Defending a company in the European Commission’s Trucks cartel investigation
Advising a party on compliance with commitments in the European Commission’s Ship Classification investigation
Advising a company in the European Commission pay-for-delay Fentanyl investigation
Advising a company in the European Commission Consumer Detergents cartel investigation
Acting for a complainant before the European Commission in a patent licensing antitrust case
Acting for a complainant before the European Commission in an exclusivity payments case
Acting for Google in the UK CMA’s investigation of Google’s Privacy Sandbox proposals to remove third-party cookies on Chrome and develop privacy-centric alternatives to support digital advertising
Education
Admissions
Event Recaps
This program provided in-house counsel with a practical, issue-spotting framework for identifying and managing the antitrust, consumer protection, and securities litigation risks that arise from corporate ESG and sustainability initiatives.
May 14, 2026
May 14, 2026 • 1-minute read
Client Alerts
Every year, the U.S. Federal Trade Commission (“FTC”) investigates high net worth individuals for failure-to-file violations of the Hart-Scott-Rodino Antitrust …
May 6, 2026
May 6, 2026 • 8-minute read
Articles
International Cartel Enforcement in 2026: Leniency as Both Sword and Shield
On March 25, 2026, at the 74th ABA Antitrust Law Spring Meeting, five leading competition enforcers from Brazil, Canada, the …
March 31, 2026
March 31, 2026 • 6-minute read
Firm News
Vinson & Elkins Opens Brussels Office with Hire of Antitrust Partner May Lyn Yuen
An experienced competition lawyer based in Brussels for over a decade, Yuen will expand the firm’s Antitrust transactional and dispute …
March 23, 2026
March 23, 2026 • 2-minute read
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