Department profile
D.N. Tzouganatos – N.S. Kosmidis & Partners

Competition/European Law

Europe Guide 2026 : Greece


D.N. Tzouganatos – N.S. Kosmidis & Partners

Rankings

About

Provided by D.N. Tzouganatos – N.S. Kosmidis & Partners

D N Tzouganatos N.S.Kosmidis & Partners has an outstanding practice in all areas of competition law (cartels, abuse of dominance mergers, state aid) and has represented clients both before the European Commission, the HCC and the courts competent for judicial review of HCC’s decisions. The firm has represented numerous clients in high-profile restrictive practices (horizontal or vertical) in sectors such as petroleum, construction, insurance, banking, steel, security and home electrical appliances. It has also defended before the HCC and the administrative courts numerous companies in abuse of dominance cases in the bauxite, beer, gaming, petroleum, press distribution and retail sectors. The Firm has a successful track record in major concentrations in a variety of industries such as the acquisition of BP Hellas by the HELPE Group (petroleum), the acquisition of Stoiximan by OPAP SA (gaming sector), the acquisition of MEDIA MARKT by PUBLIC SA (consumer electronics), the acquisition of OLP SA by COSCO (port services), the acquisition of Elpedison SA by the HELPE Group (energy)

Clients (9)

  • OPAP SA
  • Hellenic Petroleum
  • OTE Group
  • Eurobank
  • GILEAD Hellas
  • Interamerican SA
  • Imerys Bauxite SA
  • ARGOS SA
  • Public SA

Industries (9)

  • Energy
  • Gaming
  • Insurance
  • Banking
  • Beverages
  • Ferries
  • Telecoms
  • Media
  • Advertising

Chambers Review

Provided by Chambers

Competition/European Law - Greece

Band 1

Band 1


What the Team is Known For

D.N. Tzouganatos – N.S. Kosmidis & Partners is a market-leading boutique firm that demonstrates standout capability in a wide range of areas within Greek and EU competition law. The law firm has significant experience working before the Hellenic Competition Commission and is adept at advising on cartel cases and abuse-of-dominance investigations, as well as representing clients in appeals against fines. The firm additionally advises on merger notifications.

Work Highlights

Provided by Chambers

  • D.N. Tzouganatos – N.S. Kosmidis & Partners assisted Imerys Bauxites with a dispute before the Hellenic Competition Commission regarding an alleged abuse of dominance.

Strengths

Provided by Chambers

  • The partners are both proactive and very responsive and reactive, in case of urgent requests.

    Competition/European Law respondentEurope
  • We are absolutely satisfied with the quality and efficiency of the services provided.

    Competition/European Law respondentEurope
  • Our collaboration has been seamless, with the law firm always readily available and proactive in providing support.

    Competition/European Law respondentEurope
  • The partners handle cases in a well-organised and structured manner, which makes it easier for the client to follow the different stages and understand the necessity of certain steps.

    Competition/European Law respondentEurope
  • The law firm has consistently delivered high-calibre legal services.

    Competition/European Law respondentEurope

Notable Practitioners

Provided by Chambers

  • Senior StatespeopleDimitris Tzouganatos
    Senior StatespeopleDimitris Tzouganatos

    Dimitris Tzouganatos

    Dimitris Tzouganatos commands respect for his unparalleled experience in competition law matters, regularly representing clients in disputes before the HCC. He has a stellar reputation for advising clients on behavioural investigations and appeals against fines.

    • Dimitris Tzouganatos is a super respected figure in Greece for competition law.

      Competition/European Law respondentEurope
    • Dimitris Tzouganatos' academic background goes hand in hand with his vast knowledge of the market.

      Competition/European Law respondentEurope
    • He brings a high level of legal sophistication to complex competition law matters. His background and experience are evident in the structured and methodical approach he applies to each case.

      Competition/European Law respondentEurope
    • He has deep experience in cases related to competition law, as he has handled the most complex and high value cases of antitrust law in Greece and before the relevant authorities.

      Competition/European Law respondentEurope
  • Band 1Nikos Kosmidis
    Band 1Nikos Kosmidis

    Nikos Kosmidis

    Nikos Kosmidis is a highly regarded practitioner with notable experience in abuse of dominance and cartel investigations and sector inquiries. He further stands out for his expertise in challenging HCC fines following investigations and for advising clients on merger clearance filings. He also advises clients on allegations of gun-jumping.

    • Nikos Kosmidis has a perfect combination of legal knowledge, sophistication and business awareness.

      Competition/European Law respondentEurope
    • Nikos Kosmidis is one of the most prominent practitioners in the field, with an ability for grasping very quickly the most sophisticated issues and breaking them down to simple ones.

      Competition/European Law respondentEurope
    • He provides excellent opinions and solutions.

      Competition/European Law respondentEurope
    • Nikos Kosmidis is extremely experienced and competent in the field of competition law. He provides excellent opinions and solutions considering not only the compliance and regulatory environment but also the needs of the client.

      Competition/European Law respondentEurope
    • He is very valuable in collaborations.

      Competition/European Law respondentEurope

Ranked Individuals at D.N. Tzouganatos – N.S. Kosmidis & Partners (2)

Greece

Members

Provided by D.N. Tzouganatos – N.S. Kosmidis & Partners

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