Marie Demetriou QC

Brick Court Chambers

In 2019, Brick Court’s Marie Demetriou QC appeared in court 30 times, acting on a series of cases seeking to redress injustices in the financial system. Demetriou acted on the ongoing Mastercard/Merricks dispute, instructed by Quinn Emanuel Urquhart & Sullivan. The claim, the first US-style opt-out class action in the UK, seeks to reclaim funds for people aged 16 or over who used Mastercard and were overcharged on transaction fees between 1992 and 2008.

In May, the Supreme Court will hear the arguments after it granted Mastercard adviser Freshfields Bruckhaus Deringer permission to appeal an initial judgment. In a similar David vs Goliath case, last July Demetriou acted for a large group of claimants against major banks defending UK claims related to forex rigging after the financial crash.

In 2020, she will be appearing at the trial, instructed by Addleshaw Goddard, on a range of multi-party claims dating back 40 years, for hundreds of millions of pounds, arising out of a global market-sharing cartel in power cables.