Ian Mason

Ian Mason


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M +1 345 916 4600

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Ian Mason is a Partner in the Regulatory & Risk Advisory Group, having joined Walkers' Cayman Islands office in 2023. Ian is a highly experienced senior financial services regulatory, financial crime and FinTech lawyer, with over 20 years' experience advising a broad range of clients on financial services regulation and compliance. He is a former Head of Department in the Enforcement Division at the UK regulator, the Financial Services Authority (now Financial Conduct Authority - FCA) prior to which he was a Manager at the London Stock Exchange. Since leaving the regulator, he has worked as a Partner and headed the Financial Services Regulatory team at various international law firms in the UK, as well as in-house.

Ian's practice includes both contentious regulatory and advising on compliance matters, and he has particular expertise in advising on FinTech and crypto-assets, as well as financial crime, AML and market conduct issues, and advising clients on dealing effectively with regulators, including regulatory investigations and enforcement proceedings on the defence side."

Since leaving the regulator, Ian has worked as a Partner and headed the Financial Services Regulatory teams at various UK City of London firms. Ian has advised on the full life-cycle of regulatory issues facing firms and individuals, including authorisation applications, supervision issues, regulatory investigations and enforcement.

Ian has advised a broad range of clients, including asset managers and hedge funds, brokers, banks, insurers, corporates, FinTechs, senior management, CEOs and Compliance Officers/MLROs at regulated firms.

Ian has advised in the UK on a broad range of regulatory issues, including insider dealing, AML, FinTech and crypto –assets, perimeter issues (whether authorisation by the regulator is required), AIFMD, MiFID II, consumer credit, mortgage regulation

Admitted in:

Cayman Islands

England and Wales


MA (First Class Honours, Law) University of Cambridge

Admitted to the Roll of Solicitors, UK

2023 Legal 500 - Named Individual - UK Financial Services, Non-Contentious Regulatory: "Ian Mason, a specialist in FCA/PRA authorisation and the regulatory aspects of fintech, cryptocurrency and blockchain issues."

2023 Legal 500 - Named Individual - UK FinTech, Named Individual: "Ian Mason... advising on the regulatory aspects of fintech, including ICOs, cryptocurrencies and blockchain developments."

2022 Legal 500 client testimonials:

'Ian Mason is a standout star of the London financial services scene, and a tremendous asset..."

'Ian Mason is technically excellent with an eye for detail. Having worked at the regulator, he has a great sense of strategy and tactics. A pleasure to work with'

'Ian Mason is a former senior ex-regulator and is astute and pragmatic'

Practical Law Financial Services Consultation Board

Ian has also previously served on a number of industry working groups and committees, including the AIMA Market Conduct Working Group, the Society of Pension Practitioners Financial Services Regulation Committee

Ian has also written a Market Conduct column for Practical Law Financial Services.

Ian is author of a number of books and articles on financial services, including hedge fund regulation and money laundering. Previous media appearances and as a commentator include the Financial Times, BBC Radio 4 Today Programme, BBC Breakfast News, Practical Law, Thomson Reuters Accelus.

Ian is one of the contributors and managing editor of the UK Chapter of the Fintech 2021 book (Global Legal Insights).

Ian is a frequent speaker at conferences, seminars and webinars on financial services topics, including FCA Enforcement, market abuse, financial crime and FinTech.