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Tatiana Siakka

Fax +44.(0)20.7648.9001
Tatiana Siakka is an associate in the firm’s London office. She is a member of the Antitrust, Competition & Trade Regulation group.

Professional Background

Prior to joining the firm, Tatiana was an associate in the London office of a global law firm, where she focused on competition litigation. Tatiana has been heavily involved in a number of complex, multi-jurisdictional damages claims arising from infringements of EU and UK competition law, including the Air Cargo and Interchange Fee litigation. Prior to that, she was a trainee at a Greek law firm, where she gained experience in commercial and civil matters.

Professional/Civic Activities

  • Member of the Law Society’s Competition Section and Women’s Division

Additional Information


  • “A summary of recent developments in antitrust damage claims, collective redress and funding in the EU and UK,” Competition Litigation Review, 2013
  • “Consumer opt-outs: a damp squib?” Kluwer Competition Law Blog, 2013
  • “Out of time: the Supreme Court rules on the limitation period for bringing follow on damages actions”, Global Competition Litigation Review, 2012
  • Representing a group of over 500 claimants in their damages claim against British Airways in relation to the worldwide cartel in the air freight surcharges. One of the largest competition damages claims, raising novel legal arguments in respect of the ability to recover global damages in England.
  • Representing a group of multinational corporations in their private damages actions arising from unlawful interchange fees against MasterCard and Visa in proceedings before the High Court. A particularly complex hybrid claim, comprising a follow-on action for intra-EEA interchange fees and standalone claims for domestic fees applicable in 23 jurisdictions.
  • Advising a group of concrete manufacturers in relation to their claims against cement manufacturing companies. Experience includes strategy planning and coordination of mediation proceedings in a European jurisdiction.