Sean Upson

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Practice Areas

Sean specialises in complex commercial High Court and arbitral disputes. He has a particular focus on banking and finance disputes, and financial fraud cases. Sean acts for sophisticated corporate claimants (including hedge funds, financial institutions and pension funds) in complex financial disputes and fraud work. He presently acts for the 112 financial institutions claiming against Tesco Plc in respect of its £263m accounting mis-statements. Sean has recently completed a €500m complex derivatives claim and a £150m civil fraud both with substantial claimant recoveries for our clients. Sean presently leads the Stewarts team acting in the high-profile claims against Tesco Plc.


After a year working in Japan, Sean joined Baker & McKenzie (working in London and Sydney) in 1993. In 2004, Sean co-founded Masseys LLP, which obtained wide-recognition for financial disputes work before that practice was incorporated into Stewarts in 2010.

Professional Memberships

Sean is a solicitor advocate.


Sean has regularly appeared in the broadsheet and legal press and appears as a speaker at conferences on financial and shareholder disputes.


Sean enjoys mountain walking/climbing. He has led groups in the UK and tackled other routes including in the Cuillins, the Atlas mountains and the Caucasus.