Jon is a Solicitor-Advocate in Willkie's Litigation and Investigations & Enforcement Groups in London.
His practice covers civil, criminal and regulatory disputes and investigations, with a particular focus on matters involving fraud, bribery, money laundering, supply chain issues, human/business rights and other financial misconduct. He has extensive experience in defending and advising companies and individuals in relation to investigations and enforcement actions by the SFO, the FCA, the PRA, the police and other UK and overseas agencies, and handling significant High Court and appellate litigation and arbitration proceedings. He also regularly advises on key financial crime and related legislation and assists organisations to develop best-in-class compliance programmes.
Jon has acted on several of the largest and most high-profile disputes and investigations in recent years. His work typically involves complex, cross-border and business-critical matters for corporates, financial institutions, public organisations and individuals. He has particular experience in managing sensitive matters that involve overlapping civil, criminal and/or regulatory issues.
Jon is recognised in The Legal 500 as a Leading Associate for civil fraud (“Jon Malik stands out from a deep bench of talent”) and a Key Lawyer for regulatory investigations and corporate crime (2027). His civil and criminal case teams have won several major national litigation awards.
*Registered on the Solicitors Register as Jonathan Mendelsohn-Malik. SRA number 582997
Experience
Selected Significant Matters:
- Representing Man Group in defence of claims brought by the Kuwaiti Public Institution for Social Security involving allegations of fraud, bribery and corruption. The litigation, in which the claimant seeks more than $800 million from approximately 30 defendants, was named one of The Lawyer’s Top 20 cases of 2025.
- Advised a Fortune 500 company on a sensitive internal investigation into allegations of fraud, conflicts of interest and related issues.
- Acted for Ultra Electronics in relation to a long-running investigation by the SFO into suspected bribery and corruption, culminating in the SFO’s first Deferred Prosecution Agreement in five years. Shortlisted for Most Important Court Case of the Year at the 2026 GIR awards.
- Managed parallel proceedings in multiple jurisdictions in Asia, Europe and the Middle East relating to an alleged global conspiracy to defraud in the diamond industry.
- Represented a multinational bank in defence of DIAC arbitration involving fraud, Quincecare and related claims.
- Advised the founders of a cryptoasset exchange on a fraud dispute involving matters subject to well-publicised investigations by criminal and regulatory authorities in several jurisdictions.
- Acted for Petrofac in its successful and innovative resolution of one of the SFO’s largest and most complex bribery and corruption investigations. Winner of Competition / Regulation Team of the Year at the 2022 British Legal Awards.
- Advised a global pharmaceutical company on a complex, large-scale and sensitive internal investigation into bribery and corruption, regulatory, product liability, employment and other concerns in the Middle East.
- Successfully defended a natural resources company owned by an African state in ICC arbitration relating to one of the highest-profile instances of corruption globally in recent years.
- Represented Grant Thornton and others in the successful defence of multi-billion pound conspiracy and related claims brought by the Tchenguiz brothers relating to the SFO’s investigation into the collapse of Kaupthing Bank. Winner of Litigation Team of the Year at The Lawyer awards, Commercial Litigation Team of the Year at the Legal Business awards, and Banking Litigation Team of the Year at the Legal Week awards (2019).
*Jon advised on some of these matters prior to joining Willkie.
Credentials
Education
BPP Business School, M.B.A., 2014 BPP Law School, Legal Practice Course, 2013 College of Law, Graduate Diploma in Law, 2011 University of Chicago, B.A. (double first-class honours), 2008