Partner
Languages spoken
English | Greek | French
Tatiana Siakka is a competition law specialist with wide-ranging experience in both transactional and contentious matters. She is a noted practitioner, with Legal 500 describing her as an "outstanding competition lawyer" whose "knowledge of the subject is second-to-none". Tatiana advises clients on all aspects of EU and UK competition law and related commercial strategy and has successfully represented clients before the European and UK courts, as well as before the European Commission and the CMA.
"Tatiana Siakka is exceptional. She is highly intelligent, extremely personable and a real pleasure to work with. She truly goes above and beyond with the levels of commitment and hard work that she puts into a case. Her depth of understanding of how to manage a case is evident from how smooth a process it is to work with her. An excellent person to have in your corner." Legal 500 UK 2024
In addition to her transactional practice – routinely handling merger control filings, global FDI screening and clearances under the UK National Security and Investment Act – Tatiana has extensive experience in high stakes competition litigation in the EU and UK courts, including the High Court, the Competition Appeal Tribunal and the Court of Appeal, having acted in seminal and high profile proceedings for both defendants and claimants, including the leading UK authority on unlawful information exchange (Balmoral Tanks v. CMA), as well as two of the largest competition damages claims in the UK – the interchange fees and air cargo litigation – setting a precedent regarding the ability to recover global damages in England.
Tatiana is an appointed member of the Law Society’s EU Committee. She is regularly invited to speak on competition law developments and contributes towards leading competition publications.
Publications
"Labor Collusion Warning Could Signal Enforcement To Come", Law 360 UK, 10 May 2023.
“Case C-724/17 Vantaan kaupunki v Skanska Industrial Solutions: Transposition of the Concept of an ‘Undertaking’ into Civil Damages Actions”, Journal of European Competition Law & Practice, 18 November 2019.
“EU Commissioner Warns Companies of Potentially Unlawful Use of Pricing Algorithms”, Lexology, 30 March 2017.
“European Commission Opens Investigation into Suspected Price Restrictions by Electronic Goods Producers”, Lexology, 7 February 2017.
“Football Association Premier League Limited v Luxton [2016] EWCA Civ 1097”, Lexology, 2 December 2016.
“Competition and Markets Authority Opens Investigation into Auction Service Providers, Lexology, 28 November 2016.
“European Commission’s Preliminary Report in the E-Commerce Sector Inquiry: Highlighting Risk Areas for Suppliers of Branded Goods”, Lexology, 11 October 2016.
“ECJ Interprets Rules of Jurisdiction for Cartel Damages Claims”, Legal Media Group’s Expert Guides, 2016.
“CJEU Confirms EU Competition Law Does Not Prevent Royalties for Revoked Patent Licences”, Lexology, 14 July 2016.
“EU Competition Law Does Not Prevent Royalties for Revoked Patent Licences”, Lexology, May 2016.
“‘Eturas’ UAB and Others v. Lietuvos Respublikos konkurencijostaryba”, E-Commerce Law Reports, Vol. 16 Issue 2, April 2016.
“CJEU Sends Clear Warning to ‘Cartel Facilitators’”, JD Supra, 29 October 2015.
“Keeping up with Competition – Jurisdictional Issues”, Lexis PSL, 14 September 2015.
“A summary of recent developments in antitrust damages claims, collective redress and funding in the EU and UK”, Global Competition Litigation Review, 4 July 2013.
Contributing author, “Albion v Dër Cymru: Turning the taps on follow-on claims?” Lexis PSL Competition, April 2013.
Contributing author, “Consumer opt-outs: a damp squib?”, post on UK Government reforms of private actions in competition law, Kluwer Competition Law Blog, February 2013.
“Out of time: the Supreme Court rules on the limitation period for bringing ‘follow on’ damages actions”, Global Competition Litigation Review, 2012.
Speaking Engagements
Speaker, “The UK Subsidy Control Act Explained: Interaction With EU Rules”, The Law Society Seminar, 12 July 2022.
Speaker, “Overview – Preparing for the Subsidy Control Act 2022: Observations on the UK's forthcoming State Aid regime”, Lexxion, 7 March 2022.
Speaker, “State Aid v Subsidy Control Bill – Preparing For Change”, The Law Society Seminar, 21 October 2021.
Speaker, “Class Actions – The New Regime”, MBL Seminar, London, 20 June 2016.
Speaker, “Package Travel 2.0”, ETOA Conference, London, 18 March 2016.