Marta Sendrowicz

Marta Sendrowicz


Marta is the Head of Poland Competition and EU and coordinates the competition practices of our 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 matters before the Office of Competition and Consumer Protection and the European Commission.


Representative matters

Aramco on its investment in Poland’s refining, wholesale, and jet fuel marketing segments through a number of acquisitions from PKN Orlen, including advice on the purchaser approval case before the European Commission, multiple merger filings outside the EU and the FDI filing in Poland.

A global retail company regarding the sale of its operations in Poland to Salling Group A/S. We advised the client in the merger review process before the European Commission and then before the Office of Competition and Consumer Protection.

Yetico, a Polish manufacturer of styrofoam boards, in appeal proceedings before the Polish courts against the decision of the Office of Competition and Consumer Protection.

Cemex Polska, in a landmark case originating from a cartel decision of the Office of Competition and Consumer Protection in which it imposed the highest fines in its history on five cement producers, including Cemex Polska. This case was eventually brought before the Court of Justice of the European Union.

P4, a Polish mobile phone operator, in an investigation by the President of the Office of Competition and Consumer Protection regarding an alleged cartel concerning mobile television services. The Polish courts of both instances repealed the decision of the Office. 



Pro bono

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

Published Work

  • Parallel Trade and the Limits of Permitted Actions of Major Medicinal Product Suppliers in the Decisions of the European Court of Justice, in: Changes in Competition Policies over 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 Needed to Attain Market-focused Legislation, E.C.L.R, 2008/28
  • Competition Law, in: the European Union. Institutional and Economic Law, published by Meritum, Warsaw 2007

Speaking Engagements

  • Panelist, Changes in the Act on Competition and Consumer Protection - what do they mean for entrepreneurs?, 15th Competition Law Congress, November 2023
  • Panelist, Merger law aspects of M&A transactions, 4th Annual Conference on Anti-trust and Competition Compliance in CEE, December 2018
  • Moderator, Panel on Competition and New Technologies, Competition in the Digital Age Conference organised by the Office of Competition and Consumer Protection, December 2018
Marta Sendrowicz is a leading name on the Polish market who advises on a broad range of competition matters from anti-competitive behaviour investigations to merger control clearance and foreign direct investment filings.
Chambers Europe, 2023
Marta has been fantastic to work with and she has a strong team aound to support her.
Chambers Europe, 2023


  • Band 1 Competition/Antitrust Lawyer in Poland, Chambers Europe, 2023
  • Hall of Fame, Legal 500, 2023 (Competition/Antitrust)



Poland, Dottore commercialista, 2001

Warsaw Bar Association of Attorneys-at-law (Attorney-at-law)


  • PhD, Competition Law, University of Warsaw, 2001
  • LL.M., European Law, Maastricht University, 1995
  • MA, Faculty of Law and Administration, University of Warsaw, 1994


Polish, English
A&O Shearman was formed on May 1, 2024 by the combination of Shearman & Sterling LLP and Allen & Overy LLP and their respective affiliates (the legacy firms). Any matters referred to above may include matters undertaken by one or more of the legacy firms rather than A&O Shearman.