Mathew Cook

Overview

I’m a Partner of Mourant Ozannes (Jersey) LLP in our Jersey Litigation practice, and part of our specialist financial services and regulatory team as my primary focus is on regulatory work.

My work includes advising on compliance with the regulatory laws, anti-money laundering regime, sanctions, information requests and data protection. I am particularly experienced in advising on cases where potential breaches of requirements have been identified, and in advising on investigations, remediation and enforcement.

In addition, I also have experience advising financial institutions on a wide range of high-profile multi-jurisdictional banking, corporate, funds, trust and property disputes.

I’m also experienced in dealing with contentious employment matters and insolvency issues. In recent years, I’ve acted in a number of leading cases on challenges to TIEA notices and advised on mis-selling claims against banking institutions.

I am part of a team of specialists advising businesses on data protection matters including working with clients to ensure that their policies, procedures and third-party contracts can demonstrate compliance with data protection legislation, drafting information notices to meet the required standards of transparency and advising on the legality of international transfers of personal data.

Professional qualifications

• Called to the Jersey Bar, July 2008
• Legal Practice Course certificate from the College of Law
• Degree in law and accounting from Kingston University

What the directories say

In Chambers and Partners UK 2025, Mathew is ranked in Offshore: Dispute Resolution. He is described as: "an excellent advocate who charms the court with wit and clarity," and "technically excellent."

In Legal 500 UK 2025, Mathew is ranked as a Leading Partner in Dispute Resolution - Regulatory and White-Collar Crime. He is described as having "a measured and seductive style of approaching matters which is very helpful in persuading the court and indeed the other side to come round to his way of reasoning." Another source described him as "a bright and innovative lawyer in the regulatory and financial crime legal world of the Chanel Islands."

In Chambers and Partners UK 2024, Mathew is individually ranked in Offshore: Dispute Resolution. A source comments: "Mathew is excellent. He hits the mark and gets the results." Another adds: "Mathew is an outcome-focused and thorough litigator."

In Legal 500 UK 2024, Mathew is ranked Next Generation Partner and a Recommended Lawyer in both Dispute Resolution and Dispute Resolution - Regulatory and White-Collar Crime. He is described by a source as an "excellent, user-friendly practitioner."

In Legal 500 UK 2023, Mathew is a Recommended Lawyer in the areas of Dispute Resolution and Dispute Resolution – Regulatory and White-Collar Crime. Mathew is described as 'an exceptional lawyer' who 'demonstrates wide subject matter knowledge, is responsive, approachable and able to make complex subject matter understandable.'

'Mathew Cook leads the contentious regulatory side, and has become the go-to person in Jersey for businesses and individuals facing regulatory or financial crime issues. I have experience of him dealing with matters raised by the JFSC, the Attorney General or directly by clients. He provides reassuring and commercial advice to identify the multiple risk issues which may arise. He guides his clients through the best way to tackle each issue to achieve the best outcome.’ Legal 500 UK, 2022.

'Mathew Cook has good regulatory knowledge and gives detailed thoughtful advice. He is an excellent lawyer who provides a commercial insight that few others in the regulatory sphere can match.’ Legal 500 UK, 2021.

Mathew is listed as a Next Generation Partner by Legal 500 UK, 2021.