
Slaughter and May is a key port of call for a varied client roster that encompasses a broad range of market-leading domestic and international financial institutions. Co-head Ewan Brown advises boards and institutions on high-stakes FCA investigations and litigation, including leading a landmark FX investigation and its ongoing collective proceedings before the UK Supreme Court. Seasoned litigator, Jonathan Clark, handles complex, multi-jurisdictional regulatory investigations and litigation, with particular experience in benchmark manipulation and large-scale financial disputes. Gayathri Kamalanathan, whose expertise is shaped by extensive in-house experience at global banks, is renowned for her insight in matters involving coordinated regulatory and criminal enforcement. Tim Blanchard and Holly Ware have a deep bench of experts across various regulatory bodies, including the SFO, FCA, UK Competition and Markets Authority, and the European Commission.
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Key clients
- JPMorgan Chase Bank NA
- Santander UK Plc and Santander Consumer (UK) plc
- Credit Suisse AG, Credit Suisse International and Credit Suisse Securities (Europe) Limited
- Close Brothers Limited
Work highlights
Advising JPMorgan in relation to proposed collective proceedings in the Competition Appeal Tribunal (the “CAT”).
Advising Santander and SCUK in respect of the Financial Conduct Authority’s (“FCA”) ongoing review into discretionary commission arrangements (“DCAs”) and various claims and complaints relating to both DCAs and non-discretionary commission arrangements.
Acting for Credit Suisse in multiple claims arising from US$2 billion “tuna bond scandal”, which was the subject of US, UK and Swiss regulatory outcomes in October 2021.
Lawyers
Hall of Fame
The lawyers at the very top of the profession, widely known and respected by peers and clients for their longstanding involvement in market-leading work.

Leading partners
The strongest partners in their field, leading on market-leading deals and endorsed by peers and clients alike.
Next Generation Partners
Junior partners with significant recognition from clients and peers in the market and key roles on multiple matters.
Practice head
Ewan Brown
Other key lawyers
Jonathan Clark; Gayathri Kamalanathan; Tim Blanchard; Holly Ware; Deborah Finkler