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Marta Sendrowicz



Sendrowicz Marta
Marta Sendrowicz



Marta leads Warsaw's Competition and EU practice and coordinates the competition practices of Allen & Overy's CEE offices. She advises on a wide range of competition law issues arising out of commercial agreements, as well as on cases concerning abuse of a dominant position and high profile mergers. She represents clients in proceedings before the Office of Competition and Consumer Protection and the European Commission, covering explanatory and antimonopoly proceedings, leniency applications and concentration proceedings.


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Publications: 25 January 2023

Tackling foreign subsidies: new EU rules enter into force

On 12 January 2023, the EU Foreign Subsidies Regulation (FSR) entered into force. The FSR will have a significant impact on and create new obligations for parties that are participating in…

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Publications: 21 December 2022

Gender diversity on corporate boards

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Publications: 19 April 2022

Ten years of the vertical block exemption regulation in CEE

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News: 12 January 2022

Aramco expands in Poland and Central and Eastern Europe with a number of acquisitions – advised by A&O

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Experience highlights



Grzybowska 56

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Dottore commercialista, Poland, 2001

Admitted as an attorney-at-law, Warsaw Bar Association of Attorneys-at-law


PhD, Competition Law, University of Warsaw, 2001

LLM, European Law, Maastricht University, 1995

Faculty of Law and Administration, University of Warsaw, 1994

Other noteworthy experience 


  • P4, a Polish mobile phone operator, in an investigation by President of the Competition and Consumer Protection Office regarding an alleged cartel concerning mobile television services. The Polish courts of both instances repealed the decision and found that mobile phone operators had not entered into an anti-competition agreement.
  • Tesco Polska on the construction and implementation of a highly-innovative online sales system which relies on the guide price concept. The sale system was successfully defended before the President of the Competition and Consumer Protection Office and before Polish courts of both instances.
  • Amazon on a wide range of legal matters relevant to implement a strategy of the launch of online sales platform in Poland.
  • Naspers on developing assumptions and preparing a process aimed at obtaining a merger clearance, including in the context of notifying the European Commission of the intended sale of 100% of shares in Allegro Group, which included both and, to private equity funds Cinven, Permira and Mid Europa.
  • Asahi Group Holdings on the competition law aspects of its acquisition of the former SABMiller plc’s businesses and operations in the Czech Republic, Poland, Romania, Slovakia and Hungary from AB InBev.
  • A client in the banking sector in an Arts. 101 and 102 TFEU investigation initiated by the European Commission regarding potential foreclosure of FinTech companies (preventing them from gaining access to bank customers’ account data), in the context of the implementation of the Payment Services Directive 2.
  • AkzoNobel Decorative Paints on matters related to an appeal against the decision of the President of the Competition and Consumer Protection Office concerning an agreement restricting competition between AkzoNobel, Castorama, OBI, Leroy Merlin and Praktiker, including representing AkzoNobel in proceedings before the Court of First Instance and the Court of Appeal, securing a significant reduction of the fine imposed on AkzoNobel.
  • Deutsche Bank on State aid law aspects of planned legislation concerning banking tax.
  • Tesco on State aid law aspects of planned legislation concerning retail tax. 

Pro bono 

  • Marta is the head of the Warsaw Pro Bono Team. She supports the Warsaw team’s initiatives and Allen & Overy’s global pro bono programmes. She is also involved in pro bono initiatives for Court Watch Foundation. Outside Allen & Overy, she supports a charity that provides care for homeless people.

Published work

  • Parallel Trade and the Limits of Permitted Actions of Major Medicinal Products’ Suppliers in the Decisions of the European Court of Justice, in: Changes in Competition Policies for the Last Twenty Years, ed. Małgorzata Krasnodębska-Tomkiel, Warsaw 2010
  • Competition Law, in the European Union. Institutional and Economic Law, published by Meritum, Warsaw 2008
  • New Competition Law In Poland – Much Done but Still Some Changes Desirable to Attain a Market-focused Legislation, E.C.L.R, 2008/28
  • Competition Law, in: European Union. Institutional and Economic Law, published by Meritum, Warsaw 2007
  • Breach of Competition Law and Consumers Ability to Enforce Claims, Bulletin No. 6, collection of articles of the President of the Office for Competition and Consumer Protection, Warsaw 2007
  • Control of Business Concentrations in the European Union Law – selected issues, in: Modern Challenges of the European Legal Space, ed. A. Łazowski, R. Ostrihansky, Kraków 2007
  • Competition Law, in: European Union. Institutional and Economic Law, Meritum, 2006
  • Antimonopoly Law and Practice in Poland, in: The European Antitrust Review 2002, Law Business Research Ltd., 2002
  • Polish Merger Control Regulations, in: From Notification to Approval. Competition Law Handbook. EC Merger Control 12th Anniversary Edition, Global Counsel, 2002
  • Polish Competition Law in: The Global Merger Notification Handbook by Howard Adler Jr., Cameron, May 2001
  • Vertical and Horizontal Agreements under Polish Competition Law and Practice, used by Russell Pittman in Competition law in Central and Eastern Europe: five years later, Antitrust Bulletin/Spring, 1998
  • Competition Law in Central and Eastern Europe: Five Years Later, cooperation in a study developed by Russell Pittman from the USA Department of Justice, Antitrust Division, Antitrust Bulletin/Spring, 1998
  • Market definition in competition cases in the light of rulings, with St. Gronowski, Court Review (Przegląd Sądowy), 7-8 1997
  • Definition of market in an antitrust case in the light of judicial decisions, with St. Gronowski,Court Review (Przegląd Sądowy), 1997/7-8
  • Subsidiarity as a fundamental rule in the European Community legal system, Subsydiarność. Monografie I Studia. Centre for Europe Warsaw University, 1996
  • The Principle of Subsidiarity in the European Community - selected issues, European Integration Bulletin No. 4 Centre for Europe Warsaw University, 1995
  • Judiciary in the European Community, (Orzecznictwo Sądów Gospodarczych), 1994


Awards & accolades

Hall of Fame

Legal 500, 2021 (Competition/Antitrust)

Band 1 Competition/Antitrust Lawyer in Poland

Chambers Europe, 2021