Marc Delehanty

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Marc Delehanty’s practice covers a wide range of commercial and civil fraud disputes.

His cases are frequently international in nature, giving rise to jurisdiction challenges and issues of foreign law. He regularly acts in litigation with an insolvency or trusts element and on applications for urgent injunctions, especially in the asset recovery context. He has experience of dealing with cases involving gambling, cryptocurrency and sanctions.

Marc is sought out for high value, high profile and high stakes cases. He has appeared twice in the Supreme Court, conducting oral advocacy on both occasions: BTA Bank v Khrapunov (on jurisdiction for, and scope of, unlawful means conspiracy claims) and Invest Bank v El-Husseiny (on the scope to reverse transactions defrauding creditors under section 423, Insolvency Act 1986). He is currently instructed on a pending Supreme Court appeal: Crescent Gas v NIOC, a $2bn dispute raising issues of agency, insolvency and trusts law.

A flavour of Marc’s recent instructions:

Acting for 3,000+ claimants in the UK group action against Johnson & Johnson alleging fraudulent misrepresentation in the marketing and sale of allegedly contaminated talc-based baby powder.
Defending a $357m claim brought by the Bahamian Government against the Grand Bahama Port Authority.
Represented the defendant companies in a US$3billion+ Ukrainian banking fraud claim, PrivatBank v Kolomoisky, Bogolyubov, Teamtrend Ltd & others; one of The Lawyer’s “Top 20 cases of 2022”.

Marc is ranked by Chambers and Partners for three different practice areas: Commercial Dispute Resolution, Civil Fraud and Gambling Disputes. He is described as having “a razor sharp mind and a particular gift in unpacking complex commercial information and presenting it in a way that is helpful for the solicitors and court, with a pleasant advocacy style” (2026 edition) and “extremely able and brilliant on his feet” (2025 edition). He is also ranked in Legal 500, Chambers Global and Lexology Index.

Areas of Expertise

Commercial Litigation

Recent Cases

Government of the Bahamas v Grand Bahama Port Authority Ltd (UNCITRAL arbitration; award made public in March 2026) – Acting for the private port authority of the city of Freeport, defending a claim for $357m brought by the Bahamian Government under the 1955 Hawksbill Creek Agreement in respect of expenditure on public services and counterclaiming for breaches of that agreement. Contract governed by Bahamian law; Bahamas seated arbitration; tribunal comprised: Sir Anthony Smellie (former Chief Justice of Cayman Islands), Lord Neuberger and Dame Elizabeth Gloster.

Crescent Gas v NIOC [2025] EWCA Civ 1211 – Acted for the appellant / defendant, resisting the enforcement of a $2bn arbitration award against English property. Raised issues concerning asset transfers, including: agency, manner of execution of documents by companies, validity of declarations of trust and reversal of transactions under s.423, Insolvency Act 1986.

Invest Bank v El-Husseini & Others– As junior counsel in the Commercial Court, succeeded, on a preliminary issues trial which engaged expert evidence of UAE law, in establishing that final Abu Dhabi court judgments were enforceable in England at common law notwithstanding that local Abu Dhabi courts had recently refused to enforce them ([2024] 1 WLR 2132). Separately, succeeded in resisting applications for security for costs ([2022] EWHC 3008 (Comm)).

Civil Fraud

Williams v Nest Services [2025] EWHC 1409 (Comm) – As sole counsel in the High Court, successfully obtained novel form of Norwich Pharmacal disclosure order against as yet unidentified exchanges and third parties worldwide to trace misappropriated cryptocurrency.

PrivatBank v Kolomoisky, Bogolyubov, Teamtrend Ltd & Others [2025] EWHC 1987 (Ch) – As junior counsel, represented corporate defendants in a US$3billion+ claim for alleged misappropriation of monies from Ukraine’s largest bank prior to its nationalisation. One of The Lawyer’s “Top 20 cases of 2022”.

Invest Bank v El-Husseini & Others [2026] AC 1 – Junior counsel in the Supreme Court – conducting oral advocacy on appeal on behalf of the respondent UAE bank seeking to enforce Abu Dhabi court judgments and for relief under s.423, Insolvency Act 1986 to recover real estate, shares and cash transferred away by the judgment debtor and his companies.

Condair v Price [2021] EWHC 2461 (QB) – As sole counsel in the High Court (Queen’s Bench), secured ex parte freezing injunction and extensive disclosure orders in support of 7-figure claim for embezzlement by a company’s financial controller (engaging issues of proprietary relief, unjust enrichment, constructive trust, deceit, breach of fiduciary duty and breach of contract).

Hussein family v Ahmed family [2021] EWHC 2213 (Ch) – As sole counsel in High Court (Chancery), succeeded for the defendants in applications for strike-out, summary judgment and stay of various claims of fraudulent misrepresentation and unjust enrichment in connection with the sale of restaurant businesses in London.

Gray v Hurley [2019] EWCA Civ 2222 – The Court of Appeal, representing a claimant in a jurisdiction challenge and anti-suit injunction application in relation to claims of resulting trusts, undue influence and unjust enrichment for recovery of high value real estate, shares and hypercars located abroad (including the Ferrari F1 that Michael Schumacher drove to the 2003 World Championship title).

F v Persons Unknown (2019) – As sole counsel in the High Court, secured urgent ex parte freezing injunction for victim of a sophisticated fraud, where the true identity of the fraudster was unknown and had transferred misappropriated funds into Bitcoin.

JSC BTA Bank v Ablyazov & Khrapunov [2020] AC 727 – In the Supreme Court, represented the Second Defendant, challenging jurisdiction for a claim of over US$500m+ for unlawful means conspiracy based on alleged breaches of freezing orders.

International

Recent Cases

Invest Bank v El-Husseini & Others – As junior counsel in the Commercial Court, succeeded, on a preliminary issues trial which engaged expert evidence of UAE law, in establishing that final Abu Dhabi court judgments were enforceable in England at common law notwithstanding that local Abu Dhabi courts had recently refused to enforce them ([2024] 1 WLR 2132).

PrivatBank v Kolomoisky, Bogolyubov, Teamtrend Ltd & Others [2020] Ch 783 – As junior counsel in the Court of Appeal, representing corporate defendants incorporated in the BVI in challenging the English Court’s jurisdiction for a US$3billion+ claim for alleged misappropriation of monies from Ukraine’s largest bank prior to its nationalisation.

JSC BTA Bank v Ablyazov & Khrapunov [2020] AC 727 – As junior counsel in the UK Supreme Court, represented the Second Defendant resident in Switzerland, in dispute concerning jurisdiction for unlawful means conspiracy.

Insolvency

Marc has particular experience with section 423 of the Insolvency Act 1986 (transactions defrauding creditors) and related relief under sections 238 and 339 of the 1986 Act.

Crescent Gas v NIOC – Proceedings to reverse the transfer of a high value London property by a $2bn arbitration award debtor in circumstances where debtor had previously declared a trust over the property in favour of the third party transferee.

Invest Bank v El-Husseini & Others – Proceedings to reverse the transfer of a series of assets in UK and abroad by the companies of a judgment debtor to his family members.

Gambling Disputes

Marc’s practice spans the entire gamut of gambling disputes:

Bringing / defending claims for compensation for taking advantage of gambling addictions, often involving complex psychiatric expert evidence.

Actions for recovery of money from gambling operators in circumstances where money had been misappropriated / stolen and then gambled by the fraudster / thief.

Disputes over winnings, typically involving interpretation of the rules of games, and of gambling companies’ terms and conditions.

Working on all these different kinds of cases has furnished Marc with a broad and detailed knowledge of the gambling regulatory framework.

Chambers & Partners (2026 edition) describes Marc as “an expert in gambling disputes. He is very strategic and good at pointing out the risks”.

[Private Individual] v Paddy Power (2024) – Acting unled for a customer in a contractual dispute (engaging aspects of the Consumer Rights Act 2015) against one of the UK’s biggest gambling operator relating to pay out of 6-figure winnings on football accumulator ‘acca’ bets.

Condair v [various gambling operators] (2022-24) – As sole counsel, representing company whose ex-employee stole money from it and gambled 6-figure sums at various operators. Company seeks recovery of the money from the operators, alleging breaches of gambling licences (anti-money laundering and social responsibility code provisions) in permitting the ex-employee to gamble with them.

[Individual] v [Online gambling operator] (2021-24) – As sole counsel, representing claimant who alleges a gambling addiction and seeks recovery of 6-figure sums gambled online over a period of a few weeks.

[Individual] v [Offshore gambling website] (2020) – As sole counsel, advising individual gambler in dispute with offshore company in respect of disputed ‘win’ on online casino game.

Ritz Hotel Casino v Al Geabury [2015] EWHC 2294 (QB) – Successfully represented the casino at a six day High Court trial in a claim for unpaid roulette losses against a ‘high roller’ which raised detailed evidential issues about alleged gambling addiction and legal issues concerning the regulation of casinos and their obligations towards their patrons. In finding for the Ritz, Mrs Justice Simler relied upon documentary evidence which had been “painstakingly analysed by Mr Delehanty” (see judgment at para. 16). The defendant’s compliance with his disclosure obligations was scrutinised across a number of hotly contested pre-trial High Court hearings at which Marc, as sole counsel, secured orders for specific disclosure. The case was extensively reported in: The Mirror, The Guardian, The Express, The Mail and The Evening Standard.

Testimonials

“Marc is really thriving and has had a lot of victories in the last year. Recently, he was a standout in the Supreme Court in terms of his advocacy.”

Chambers & Partners 2026

“Marc is incredibly hard-working, and his client-handling skills are superb. He enjoys being part of the team, and he is brilliant fun.”

Chambers & Partners 2026

“He has got a razor sharp mind and a particular gift in unpacking complex commercial information and presenting it in a way that is helpful for the solicitors and court, with a pleasant advocacy style.”

Chambers & Partners 2026

“He is very diligent and thorough.”

Chambers & Partners 2026