Assimakis Komninos | White & Case LLP International Law Firm, Global Law Practice
 Assimakis Komninos
 Assimakis Komninos

Assimakis Komninos

Partner, Brussels

Assimakis Komninos “effectively combines academic knowledge, practical expertise regarding major EU cases and experience from his time as a Commissioner at the Hellenic competition authority.”

Chambers Global 2014


Assimakis advises on questions of EU and Greek competition law, EU law, international arbitration, and litigation and private international law.

His practice focuses on complex cases of abuse of dominance, restrictive agreements and merger notifications, and he represents clients before the European Commission, national competition authorities and national administrative, as well as civil courts and arbitration tribunals.

Clients look to Assimakis for his proven track record and his ability to combine quietly resolving the most sensitive and complex investigations with aggressively litigating to achieve the necessary resultsresolving disputes through highly sensitive and complex investigations, as well as by means of aggressive litigation. Chambers Global 2014 notes that he has "extensive experience and a deep understanding of competition law and economics."

Assimakis has acted before the European Court of Justice in Syfait v. GlaxoSmithKline and Lélos v. GlaxoSmithKline (parallel trade of pharmaceuticals - abuse of dominance), and in GlaxoSmithKline Services v. Commission (parallel trade of pharmaceuticals - Article 101). He was also involved before the EU General Court in Microsoft v. Commission (compulsory licensing of interoperability information), GlaxoSmithKline Services v. Commission (parallel trade of pharmaceuticals - application of Article 101), Chalkor Metal Works v. Commission (copper plumbing tubes) and Public Power Corporation v. Commission (Greek lignites). He also successfully represented Aegean Airlines in Aegean/Olympic II, which resulted in the European Commission clearing the deal in a Phase II proceeding. This was the first time that the Commission cleared a merger after it had previously prohibited it.

Assimakis has represented clients in proceedings before the Albanian, Cypriot, French, Greek, Kosovo and Romanian competition authorities and Belgian, Bulgarian, Cypriot, French, Greek, Latvian and Spanish appellate courts. He has particular experience in arbitration cases involving EU and national competition issues, and in private antitrust litigation cases in national courts. Notable clients include GlaxoSmithKline, Microsoft and Public Power Corporation.

Assimakis rejoined White & Case in September 2011, after serving for two years as a Commissioner and Member of the Board of the Hellenic Competition Commission (HCC). As a Commissioner, he sat on the HCC Board in over 20 antitrust and merger cases, and headed the Greek delegation at OECD and ICN meetings.

Assimakis is currently a visiting fellow of the Centre for Law and Governance in Europe at University College London (UCL) and a senior associate fellow of the Institute for European Studies (IES) at the Vrije Universiteit Brussels (VUB). He is a prolific writer on legal matters and often gives speeches and seminars on EU competition law, arbitration and Greek law, and is a non-governmental advisor to the International Competition Network (ICN).

Bars and Courts

  • Brussels Bar (E list)
  • Athens Bar (Greek Supreme Court)


  • PhD, European University Institute, Italy
  • LLM, New York University School of Law, USA
  • LLM, Trinity College, University of Cambridge, UK
  • LLB, University of Athens, Greece


  • English
  • French
  • German
  • Greek
  • Italian


Merger clearance in Aegean/Olympic II

In a first for EU merger control, Assimakis achieved a significant success for Aegean Airlines before the European Commission, which cleared the Greek carrier's proposed acquisition of its rival Olympic Air. This was the second time the two companies had tried to merge, following Olympic/Aegean I, when the Commission prohibited the transaction. The decision allowed a much-needed consolidation, which allowed Aegean to compete more aggressively in the European market. Assimakis, who co-led the team which handled the transaction, demonstrated his skill in dealing with the most challenging merger cases.

Mobile telephony – EU merger filing

Assimakis represents an international company active in mobile telephony in an EU merger Phase II filing.

EU energy

Assimakis advises a major energy company on questions of EU unbundling legislation and on EU merger rules in a Phase II case.

Abuse of dominance proceedings - Europe

Assimakis represented a major international company active in the coffee market in abuse of dominance proceedings, as well as in litigation in national courts and competition authorities.

Successful appeal against a State aid decision

Assimakis successfully represented a number of Greek casinos before the EU General Court, in an appeal against a State aid decision.

Abuse of dominance (margin squeeze) proceeding

Assimakis represented a major Greek mobile telephony company in an abuse of dominance (margin squeeze) proceeding before the Hellenic Telecommunications and Post Commission (EETT).

Representing a major company active in the soft drinks

Assimakis represented a major company active in the soft drinks market before the Greek courts.

Eurozone crisis

Assimakis has advised sovereign and corporate clients on the Eurozone crisis and on Euro-exit risks.

EU competition law and arbitration

Assimakis has worked on the defense side in a number of major ICC arbitration cases involving EU competition law, notably in liquefied natural gas and digital TV services.

EU State aid and arbitration

Assimakis has advised a bank on questions of EU state aid law and on their relevance to an ICC arbitration proceeding.

Abuse of dominance proceeding - Kosovo

Assimakis successfully represented a company active in the cement industry before the Kosovo competition authority, in the first ever abuse of dominance proceeding. The company was acquitted.

Albanian competition authority - cement

Assimakis successfully represented a company active in the cement industry before the Albanian competition authority.

EU agricultural policy

Assimakis advised a non EU government on EU agricultural policy issues, in particular on imports of butter to the EU.

EU competition compliance

Assimakis has conducted a number of EU competition compliance audits for major companies in the construction materials, cosmetics and food and drinks markets.

Excessive pricing practices by airports

Assimakis advised companies active in car rental services in cases involving airports' excessive pricing practices.

Advising on EU gambling rules

Assimakis represented a company in a complaint before the European Commission.

Speaking Engagements

"Private Antitrust Enforcement in Europe and the Shape of Things to Come", 8 November 2013: Conference on 'Litigating EU Competition Law Issues before Arbitrators and Judges',
, (organized by LUMSA University)

"EU Competition Law before Arbitrators", 8 November 2013: Conference on 'Litigating EU Competition Law Issues before Arbitrators and Judges',
, (panel moderator) (organized by LUMSA University)

"Collective redress, Consensual Settlements, and other Incentive Devices", 7 November 2013: 9th Global Competition Law Centre (GCLC) Annual Conference on 'Antitrust Damages in EU Law and Policy',

"Restrictions of Competition by Object: The Changing Landscape", 25 October 2013: Academy of European Law (ERA),
, (panel moderator)

"Control of Awards by Courts on Competition Law Grounds", 7 October 2013: Session on 'Abuse and Use of Antitrust Issues in Arbitration,' 2013 Annual Conference of the International Bar Association (IBA),

"Independence of Competition Authorities in Law and in Practice", 3 October 2013: European Competition Day Conference,
, (organized by the Lithuanian Competition Council in the context of the 2013 Lithuanian Presidency of the European Union)

"Procedural Aspects of Competition Law Enforcement (Human Rights, Rights of Defence, Due Process)", 8 June 2013: 7th International Conference on Competition Law and Policy, Institute of Studies in Competition Law and Policy (IMEDIPA),
, (panel moderator)

"The Recent Restructuring Drive and Competition Law", 7 June 2013: 7th International Conference on Competition Law and Policy, Institute of Studies in Competition Law and Policy (IMEDIPA),

"EU Private Antitrust Enforcement: Retrospective and Prospective", 17 April 2013: Seminar on 'Recent Case Law in Antitrust and the UCP Practice in Member States',
, (organized by the OECD-GVH Regional Centre for Competition)

"Concluding Remarks", 20 March 2013: Concurrences Workshop on 'Rebates, Margin Squeezes...: The Equally-efficient Competitor Test',
, (organized in partnership with White & Case LLP and Charles River Associates)


  • The 'As Efficient Competitor Test' after Post Danmark: Emphasis on Margin Squeeze, Concurrences, 2013(3), pp. 24–27, (co-author with Stratigoula Sakellariou)
  • Abuse of a Dominant Position, Competition Law, Dimitris N. Tzouganatos (Ed.), Nomiki Vivliothiki, Athens, pp. 455–542, 2013, (co-author with Ioannis Lianos) (in Greek)
  • Non-pricing Abuses, Competition Law, Dimitris N. Tzouganatos (Ed.), Nomiki Vivliothiki, Athens, pp. 543–642, 2013, (co-author with Ioannis Lianos) (in Greek)
  • Arbitration and EU Competition Law, International Antitrust Litigation, Conflict of Laws and Coordination, Jürgen Basedow, Stéphanie Francq & Laurence Idot (Eds.), Hart Publishing, Oxford/Portland, pp. 191–222, 2011
  • Arbitration and EU Competition Law in the Post-Modernisation Era, EU and US Antitrust Arbitration, Blanke & Landolt (Eds.), Kluwer Law International, Alphen aan den Rijn, pp. 433–487, 2011
  • Chapter 11: The Procedure in the Network, Competition Law of the European Community, Korah (Ed.), Matthew Bender, New York, pp. 11-1 – 11-75, 2010, (co-author with Lefkothea Nteka)
  • IP Rights in the EU Microsoft Saga, Competition Law and the Enforcement of Article 102, Etro & Kokkoris (Eds.), Oxford University Press, Oxford, pp. 83–98, 2010, (co-author with Katarzyna Czapracka)
  • EC Competition Law and Parallel Trade in Pharmaceutical Products, The Reform of EC Competition Law, New Challenges, Kokkoris & Lianos (Eds.), Kluwer Law International, Alphen aan den Rijn, pp. 377–408, 2010, (co-author with Anthony Dawes)
  • EC Private Antitrust Enforcement, Decentralised Application of EC Competition Law by National Courts, Hart Publishing, Oxford/Portland, 2008
  • EC Competition Law: A Critical Assessment, Hart Publishing, Oxford/Portland (Associate Editor; General Editors Giuliano Amato & Claus-Dieter Ehlermann), 2007

Awards & Recognition

Competition/European Law – Belgium, and Corporate/ Commercial – Greece, Chambers Global 2014

GCR International Who's Who of Competition Lawyers for 2014 and 2015

Who's Who Legal: Life Sciences 2015

Winner of the Client Choice Award 2015 for the Competition & Antitrust category for European Union