Nathy Dunleavy SC

Nathy practises in commercial, public and EU law and has wide-ranging experience in areas including financial regulation, civil fraud, professional negligence, constitutional law, private international law, sanctions, competition, state aid and public procurement. He began his career with Shearman & Sterling in New York and subsequently practised with Sullivan & Cromwell before coming to the Irish Bar in 2007.

Recent work has included: Energia/GR Wind Farms v Commission for Regulation of Utilities [2025] IESC 1, [2024] IEHC 390 (re Regulation (EU) 2019/943 on electricity); Word Perfect v Minister for Public Expenditure and Reform [2025] IECA 45 (public procurement; lot division; expert evidence); Trafalgar Developments v Mazepin (acting for defendants in $2 billion civil fraud claim; multiple judgments including [2022] IEHC 167 on jurisdiction); Kilshane/Coolpowra v Eirgrid plc [2025] IEHC 174 (challenge to Electricity Capacity Auction); Aviation Insurance Litigation (acting for four war risk insurers in a number of Russian aviation insurance cases); ICC Arbitration (acting for the defendant in a contractual dispute; 2025 partial ICC award); Trucks Litigation (acting for defendants in ongoing follow-on competition law damages claims arising from the European Commission’s Trucks decision); SERE Holdings Limited v HSE [2024] IECA 197 (public procurement; selection criteria; RWIND test); Friends of Ardee Bog v An Bord Pleanála [2024] IEHC 634 (planning; leave to appeal); Coolsivna Construction Limited v Meath County Council (High Court, ex tempore judgment of 26 July 2024) (public procurement; automatic suspension);  In re GTLK Europe DAC [2023] IEHC 674 (liquidation; sanctions); In re GTLK Europe DAC [2023] IEHC 486 (liquidation; sanctions; beneficial ownership of assets); Persona Digital v Minister for Public Enterprise (ongoing claim re award of mobile phone licence; judgments including [2019] IECA 360 (procedural appeal); [2017] IESC 27; [2015] 1 IR 124 (litigation funding)); Glenman Corporation v Galway City Council [2023] IEHC 336 (public procurement; exclusion of tenderers; time limits); Loc8 Code Limited v Department of the Environment, Climate and Communications [2023] IEHC 752 (time limits; strike out); Pola Logistics v GTLK Europe [2022] IEHC 501 (shipping contracts; sanctions on Russia under Regulation (EU)  269/2014); Central Bank of Ireland v Lynch [2022] IEHC 319 (insider dealing; Central Bank inquiry and High Court confirmation hearing); Three v ComReg [2022] IECA 300 (statutory appeal of complex decision on structure of spectrum auction); Various applications for approval of mergers under the Cross-Border Mergers Regulations 2008; Word Perfect v Minister for Public Expenditure and Reform [2022] IECA 131; [2022] IEHC 54; [2021] IECA 305 (public procurement); Central Bank Inquiry re Irish Nationwide (representing a person concerned); HKRME LLC v English [2021] IEHC 142; [2021] IEHC 376; [2019] IEHC 306 (civil fraud; freezing orders; unjust enrichment); STT Risk Management v Transdev [2021] IEHC 214 (breach of contract); Whitemountain Quarries v Donegal County Council [2021] IEHC 401 (injunction); Goode Concrete v CRH [2020] IECA 56, [2015] 3 IR 493 (competition); Narooma Ltd v HSE [2020] IEHC 315 (referral to arbitration); Clarke v Ireland [2020] IEHC 716 (pensions; constitutional property rights; EU law); CCPC v Chairs Limited (2021/102 MCA) (Application under s.14B of the Competition Act 2002); CCPC v Ticketmaster (2020/267 MCA) (Application under s.14B of the Competition Act 2002); BPSG Ltd v Courts Service [2017] 2 IR 343 (data protection; human rights; access to court records).

Author of Competition Law: A Practitioner’s Guide (Bloomsbury Professional, 2010); Contributing Author to A Concise Guide to Arbitration in Dublin (Arbitration Ireland, Clarus Press, 2022); The EU Charter, Business Rights and Internet Injunctions (2012) 19 Commercial Law Practitioner 146 (with S Lee); Principles of apportionment in contribution cases (2009) 125 Law Quarterly Review 329; Contribution among antitrust defendants in English law (2009) 30 European Competition Law Review 22; Application of the Teckal exemption in the United Kingdom: the Court of Appeal decision in Brent LBC v Risk Management Partners Ltd [2009] Public Procurement Law Review 237; Apportionment of liability in contribution cases (2008) 15 Commercial law Practitioner 167; UK-US Extradition for Antitrust Offences (2006) 19 International Law Practicum 35 (with R Osgood)

Nathy has acted in a number of pro bono matters throughout his career, including under the Bar’s Voluntary Assistance Scheme.