Mario Siragusa is a senior counsel based in the Rome office and spends a substantial part of his time in the Brussels office.
Mario Siragusa focuses on corporate and commercial matters and he specializes in EU and Italian competition law and complex commercial litigation. He appears frequently before the European Court of Justice, the General Court of the European Union, the Directorate General for Competition of the European Commission, as well as the Italian Antitrust Authority and Italian civil and administrative courts. He lectures regularly at conferences throughout the United States and Europe and has published numerous articles in U.S. and European legal journals. He is a professor at the College of Europe in Bruges.
His most recent publications include: “A Conversation with Prof. Avv. Mario Siragusa on the Evolving Tensions Between IP Rights and Competition Law: FRAND, SEPs, and Antitrust,” Competition Pills, April 16, 2026; “Italy,” Public Procurement 2026, Chambers and Partners, April 9, 2026; “Competition Stories: Fall 2025”, Network Law Review, November 2025; “EU Competition Law and Its Extraterritorial Application”, co-author G. A. Polizzi, Fordham at Fifty: an Antitrust Conference for the World, Editor James Keyte, 2025; “La nozione di impresa nel diritto antitrust e gli sviluppi recenti/The Notion of Undertaking in Antitrust Law and Recent Developments” - Atti Convegno “Dialoghi con Alberto Mazzoni” – Università Cattolica di Milano, forthcoming; “Antitrust and consumer welfare, facing the twin environmental and digital transitions”, Orizzonti del diritto commerciale, Issue 3/2023; “Recent EU and Italian Trends in the Energy Sector: Failure to Provide Information as Abusive Conduct,” in The Interaction of Competition Law and Sector Regulation, Edward Elgar, 2022; “Payment Services in the EU: Price Regulation to Protect a Duopoly” Competition Law Journal, 2020; USA Against Big Tech, All Possible Scenarios and What It Means to Europe, Agenda Digitale, 2019; Private Antitrust Enforcement in Italy,” Antitrust Chronicle (Volume 3, Number 1) (A. Comino co-author), 2019; Disapplication of National Law Conflicting with EU Competition Rules: the Italian Competition Authority’s Decision-Making Practice, Europäisches, deutsches und internationales Kartellrecht, Otto Schmidt, 2018; The EU Court of Justice Clarifies the Scope of the Regulatory Framework for Three-Party Schemes but Individual Assessment Is Needed to Determine Whether Fee Caps Apply, Concurrences, 2018;
Mr. Siragusa is recognized as a “star performer” in Competition / European Law by Chambers Europe and a leading professional in EU, Regulatory and Competition Law by The Legal 500 EMEA and Who’s Who Legal. He is recognized as a leading lawyer in TMT: Telecommunications by Chambers Europe. In 2020, he was recognized as a Commercial and Transactions - Competition/Antitrust “star” by Benchmark Litigation Europe. In 2015 he was named Italian Energy Antitrust/Regulatory Lawyer of the Year by LegalCommunity.
In 2021, Mr. Siragusa was appointed President of AIGE, Associazione Italiana Giuristi Europei.
Mr. Siragusa joined the firm in 1973, became partner in 1980 and a senior counsel in 2018. He graduated with honors from the Law School of Rome University in 1970 and received a Diploma of High European Studies from the College of Europe, Bruges, in 1971. He received an LL.M. from Harvard Law School in 1972.