Stephen C. Mavroghenis

Stephen Mavroghenis is a partner in the Antitrust practice at Goodwin. He joined Goodwin in 2025.

Stephen has spent over two decades advising on all aspects of EU and UK competition law, and related commercial strategy. Stephen’s practice focuses on EU and UK competition law, in addition to EU regulatory and intellectual property law. He is regularly instructed to advise on complex cross border merger control matters, global cartels and behavioral antitrust investigations. Stephen has extensive experience in the aviation, chemicals, energy, high-tech and information technology, pharmaceuticals and medical devices, manufacturing, and media and entertainment industries. He regularly appears in proceedings before the European Commission and the European Courts in Luxembourg, as well as the UK Competition and Markets Authority. He also appears before the national competition authorities globally.

Stephen regularly advises multinational corporations on international mergers, acquisitions, joint ventures, and corporate takeovers and defends clients against allegations of cartel participation and abuses of dominance, including issues relating to refusals to deal/license, intellectual property rights, rebates, predatory and excessive pricing. Stephen also counsels clients on a broad variety of business practices including licensing and supply agreements, distribution, agency and the establishment and maintenance of compliance programs.

Stephen has published widely on competition issues and is a contributor to multiple legal publications and is a frequent speaker on competition law and policy.

• Advised Qualcomm Incorporated in related to its acquisition of Autotalks
• Advised a leading tech client in relation to a multi-jurisdictional no poach claim
• Advised the American Banking Association in relation to the merger and conditional clearance of the proposed acquisition of IHS Markit by S&P Global*
• Advised StubHub in relation to the Phase II Competition and Markets Authority inquiry into its acquisition by Viagogo*
• Avised eBay before the Competition and Markets Authority and, together with co-counsel, the Spanish National Markets and Competition Commission, in relation to the sale of its secondary ticketing business, StubHub, Inc.*
• Advised investor group in relation to the rescue and rescue and restructuring of HSH/Nordbank 
• Advised Qualcomm Incorporated in the Phase II investigation of its $47 billion acquisition of NXP Semiconductors N.V. both in the EU and rest of the world*
• Represented a major Asian manufacturing company in the European Commission’s current cartel capacitors investigation*
• Advised Viacom and Paramount Pictures in the EU’s Pay-TV investigation of provisions in licensing agreements between the major US film studios and the largest European Pay-TV broadcasters. We successfully reached early resolution of the matter for Viacom and Paramount with the European Commission*
• Advised Piraeus Bank on the State aid aspects of its EUR 4.9 billion restructuring and recapitalization*
• Eurobank. Advised on the State aid aspects of its EUR 2.04 billion restructuring and its recapitalisation 

Member, International Bar Association

Member, England & Wales Law Society: Competition Section

• Ranked by Legal 500 EMEA in Belgium for Competition
• Ranked by Chambers Europe in Belgium for Competition
• Ranked in Competition and Antitrust Law by The Best Lawyers in Belgium
• Ranked by Who’s Who Legal’s, Thought Leaders for Competition
• Ranked by Euromoney Expert Guides for Competition and Antitrust
• Ranked by Chambers Global in Belgium for Competition/European Law

“Stephen Mavroghenis of [Goodwin Law] is highlighted by sources as a “bright, active practitioner with deep and impressive understanding of the clients’ businesses and needs”. He particularly excels in high-profile cross-border merger cases.”

– Who’s Who Legal

Clients state, “He blends an understanding of the needs of the business with what he knows the regulators want to see," adding that "he is extremely persuasive and is willing to dig in where necessary, which leads to the best possible results." Another interviewee noted that Stephen “sees the bigger picture and how this matter can impact our business going forward.”

Furthermore, an interviewee said, Stephen defends companies in global cartel or abuse of dominance investigations carried out both by the EC and by competition regulators in other jurisdictions. "In terms of substance, he is really good." "He is very easy to work with because of his intelligence, his ability to understand complex situations and his ability to know what is important and what is not."

– Chambers Europe,

• Co-Author, “Aid in the Banking Sector,” EU State Aid Control: Law and Economics, Wolters Kluwer, March  2025
• Co-Author, “European Union: analysing the impact of tightened regime on restriction of online sales,” Global Competition Review, 2022, 2023, and 2024
• Co-Author, “EU Competition Law Development: Interim Injunctive Relief Back on the Menu,”, October 23, 2019
• Co-Author, “Aid in the Banking Sector,” EU State Aid Control: Law and Economics, Wolters Kluwer, December 2016
• Co-Author, “EU: Cartels & Lenience,” Global Competition Review, July 2016
• Co-Author, “EU Cartels & Leniency,” The EMEA Antitrust Review, Global Competition Review, 2017
• Co-Author, “The EU General Court annuls the Commission’s decision fining a number of cargo airlines for a price fixing cartel (Airfreight Cartel),” Concurrences, January 2016
• Co-Author, “EU Cartels & Leniency,” The European Antitrust Review, Global Competition Review, 2016
• Co-Author, “EU Cartels & Leniency,” The European Antitrust Review, Global Competition Review. 2015
• Co-Author, “Merger Remedies: An overview of EU and national case law,” e-Competitions, Antitrust Case LawBulletin, May 2014
• Co-Author, “Margrethe Vestager: The new EU competition Commissioner,” CompLaw 360, October 2014
• Co-Author, “Takeaways from appeal of UK hotel bookings settlement,” CompLaw 360, October 2014
• Co-Author, “Can EU states do whatever they want to foreign takeovers?,” CompLaw 360, September 2014
• Co-Author, “The EU General Court gets a rap in its knuckles,” Law360, 2014
• Co-Author, “EU Cartels & Leniency,” The European Antitrust Review, Global Competition Review. 2014
• “What is the legal basis of the EU cap of bankers’ bonuses?,” City AM, London, 2013
• Co-Author, “European Union Competition and Cartel Leniency,” Practical Law Multi-Jurisdictional Guide, Competition and Cartel Leniency, PLC, 2012
• Co-Author, “Recent Developments in EU Merger Control 2012,” Journal of European Competition Law & Practice, 2012
• Co-Author, “Recent Developments in EU Merger Control 2011,” Journal of European Competition Law & Practice, November 2010
• Co- Author, “Public Funding of Broadband Services,” Global Competition Review—The European Antitrust Review 2007, September 2006
• Co-Author, “Predatory Pricing,” Global Competition Law Centre, 2005
• Co-Author, “Rescue & Restructuring Aid: A Brief Assessment of the Principal Provisions of the Guidelines,” European State Aid Law Quarterly, 2003
• “European Commission Consults on Technological Transfer Proposals,” European Regulatory Affairs News, 2003
• Co-Author, “EU State Aid Overview.” Global Competition Review— The European Antitrust Review, 2004
• Co-Author, “EU State aid Control: Law and Economics, Banking Sector,” Wolters Kluwer Law & Business, 2015
• Co-Author, “The EC State Aid Regime—Distortive Effects of State Aid on Competition and Trade, the Market InvestorTest,” Cameron, May 2006
• Panelist “Antitrust and Economic Regulatory Compliance: Hot Issues and New Trends in the EU, Japan, and Korea,” Legal Plus Japan, 8th Annual International Arbitration & Corporate Crime Summit, December 2022
• Speaker, "Through the Looking Glass," Legal Plus South Korea: 9th Annual International Arbitration &Corporate Crime Summit, November 2022
• Speaker, “Merger control assessment in the digital sector & Foreign direct investment,” Nomiki Bibliohtiki International Conference, October 2021
• Speaker, “The Rise of Global Mega-Firms: Lessons from the Aftermath of Siemens/Alstom,” InformaConnect Merger Control Digital Conference, October 2020
• Speaker, “Data Collection, Protection, Sharing & Competition,” Nomiki Bibliohtiki 4th Annual Competition Law Conference, October 2020
• “Due process in competition proceedings: evolving standards,” IBA Annual Conference, Seoul (22-27 September 2019)
• Speaker, “Hipster Antitrust: Altering the Objectives of Antitrust Enforcement, Including Fairness, Privacy, and Public Interest?,” Wolters Kluwer & Legal Plus 6th Annual International Arbitration, Regulatory & Competition Law Global Summit, September 2019
• Speaker, “Hipster Antitrust: Why Isn’t Consumer Welfare Enough?,” Nomiki Bibliohtiki 3rd Annual Competition Law Conference, May 2019
• Speaker, “Advising on Cartel Enforcement in Asia,” Wolters Kluwer & Legal Plus 6th Annual International Arbitration, Regulatory & Competition Law Global Summit, September 2018
• Speaker, “EC Cartel Enforcement Updates and Trends,” Nomiki Bibliohtiki 2nd Annual Competition Law Conference, 2018
• Speaker, “Cartel Settlements” and “Q&A Clinic,” IBC Legal Advanced EU Competition Law Conference, Brussels, November 2016
• Panelist, “Regulation of platforms and the digital single market,” IBC Legal Competition Law and Regulation in the Telecoms, Media and Technology Sector Conference, Brussels, October 2016
• Panelist, “Cartels – International problems and issues” and “Regional enforcement updates – Ask the experts – China, India, HK, EU Q&A,” Kluwer 2nd Annual Global Competition Law Forum, Shanghai, July 2016
• Panelist, “Process, privilege and procedure: A guide to navigating new approaches to the EC process issues panel,” Global Competition Review Live 8 Annual Brussels conference: The bigger picture, Brussels, July 2016
• Speaker, “Advice in investigations – Japan, US and Asia focus,” Kluwer 2 Annual Japan Global Competition Law Forum, Tokyo, June 2016
  Chair of the Kluwer 5 Annual Global Competition Law Summit, Hong Kong, April 2016
• Speaker, “Minority shareholders: Update on proposals for reform,” IBC Merger Control conference, Brussels, April 2016
• Panel Moderator, “Mergers: practical challenges,” IBC Advanced Competition Law Conference, Brussels, February 2016
• Speaker, “What are the competition risks to your business?,” IBC Legal Compliance & Ethics International, London, November 2015
• Speaker, “Competition challenges from online retailing – new wine in old bottles?,” Gl 7th Annual Brussels: The conference about the bigger picture, Brussels, November 2015
• Speaker, “Due process in competition cases,” IBA Annual Conference, Vienna, October 2015
• Speaker, “Opting to blow the whistle or choosing to walk away?,” The American Lawyer US – EU LegalSummit, Brussels, June 2015
• Speaker, “Cartels – Problems and issues in Japan and Asia,” Kluwer Global Competition Law Forum, Tokyo, May 2015
• Speaker, “Mergers – trends and challenges,” IBC Legal Advanced EU Competition Law, London, April 2015
• Speaker, “Protecting your client in an era of global enforcement,” ABA 2015 Asia Forum, Tokyo, March 2015
• Speaker, “EU Cartel enforcement: Trends and developments,” Korea Competition law forum, September 2014
• Speaker, “Cartels in the EU,” Wolters Kluwer 2nd Annual Competition law forum, September 2014
• Speaker, “Cartels – Problems and Issues China, Europe and US,” Wolters Kluwer 3rd Annual Global Competition law forum, June 2014
• Speaker, “Most favoured nation clauses,” The Law Society webinar, January 2014
• Speaker, “What is the legal basis of the EU cap of bankers’ bonuses,” 2013 City Remuneration Summit, June 2013
• Speaker, “Competition law for in-house legal advisers,” Butterworth’s Conference, September 2013
• Speaker, “How to Prepare in an Era of Aggressive Global Cartel Enforcement,” Japan Institute for Overseas Investment, December 2012
• Speaker, “What’s Wrong with U.S. Class Actions? Rethinking the Class Action Device from a Global Perspective,” ABA Section of International Law, April 2012
• Speaker, “Abuse of dominance: law and economics of pricing,” Competition Law in Transition: Trends and Challenges, June 2011
• Speaker, “The EC Sector Inquiry in the Pharmaceutical Industry,” ABA Section of Antitrust Law: Health Care and Pharmaceuticals Committee, October 2010
• Speaker, “Managing the Worldwide Antitrust Landscape,” Georgetown Global Antitrust Enforcement Symposium, September 2010
• Speaker, “ETHICS: Essentials of Protecting Attorney-Client Communications in the Trenches of Public and Private Antitrust Enforcement: Perspectives from the U.S., Europe and Korea,” Presented by the Compliance & Ethics and International Committees - ABA Spring Meeting, April 2010
• Speaker, “Intellectual property and antitrust in the biotech sector,” Stanford IP Antitrust Symposium Comparing Trends in US and Europe, April 2010
• Speaker, “Article 102 EC and Strategic Patenting - Patent Thickets and Follow-on Patents,” Conference on the Commission’s Pharmaceutical Sector Inquiry, Brussels, January 2009
• Speaker, “Antitrust Developments in Litigation, Mergers and Cartels—A Transatlantic Perspective,” 18th Annual General Council Conference, New York, June 2006