Europe Guide 2026 : Ireland
Ranked Individuals
Provided by McCann FitzGerald LLP
Our Antitrust and Competition Group advises on the full range of antitrust and competition matters, including merger clearance, “dominant firm" issues, cartel defence, State aid, sector regulation and EU law issues such as free movement, public procurement and customs. Operating across Dublin and Brussels, the Group is widely recognised as a leader in Ireland. Established over 30 years ago, we have secured precedent-setting wins in merger control and contentious competition cases, including before the Irish Supreme Court and the European Courts. We pioneered the use of competitive effects analysis and economic evidence in Ireland.
Our State aid and merger control practices are widely regarded as pre-eminent, with experience across complex “3 to 2” mergers and Phase 1 clearances. We also act in cartel investigations and immunity applications, and advise on Irish FDI and EU foreign subsidy regimes. The group encompasses long-standing private practitioners and former high-ranking regulators. We offer clients practical, insightful and pinpointed legal output in a timely and cost-efficient manner, while maintaining the highest standard of work, upon which our group’s reputation has been established.
Our clients range from multinational corporations and State-owned utilities to SMEs, trade associations, regulators and government departments.
Provided by Chambers
McCann FitzGerald LLP's competition law team is particularly active in merger control filings. It has additional experience in behavioural mandates, representing clients in both investigations and enforcement proceedings. Team members have further expertise in state aid and compliance matters. The team has recently expanded with the arrival of Liam Heylin in October 2025.
Provided by Chambers
McCann FitzGerald LLP advised Brookfield Renewables on the merger control aspects of its proposed acquisition of Neoen.
Provided by Chambers
I find the firm's response times really good; the lawyers will drop everything to assist.
The lawyers are thoughtful, clear, calm and very responsive.
The firm has deep sector knowledge and expertise. It offers a strong combination of competition and regulatory expertise.
The team is excellent - very on the ball, very efficient at responding to everything and engages well with clients.
McCann FitzGerald has the talent and resources to steer any complex claims.
Provided by Chambers
Laura Treacy has a strong focus on assisting clients with obtaining competition law clearance for proposed mergers. She additionally represents clients in behavioural investigations and advises on the antitrust compliance aspects of collective bargaining agreements.
She seems to have a really fantastic knowledge of the law and understanding of the process. There is no question that she does not have an immediate answer to. She is a really safe pair of hands.
I would commend Laura Treacy for her deep encyclopaedic knowledge of both Irish and EU competition law.
I have been impressed with her technically ability, together with her responsiveness and pragmatic approach to advice.
In addition to handling the competition issues with great skill and expertise, she has demonstrated a real commercial sensitivity to the bigger picture.
Laura Treacy is super experienced. She is able to bring a lot of expertise and knowledge from previous cases and has a good approach to things.
Liam Heylin joined McCann FitzGerald in October 2025. He is active across a range of competition matters. He frequently assists clients with merger control filings, as well as acting on abuse of dominance allegations, state aid matters and compliance with EU legislation, especially for clients in the technology sector.
Competition/European Law
Competition/European Law
Provided by McCann FitzGerald LLP
Laura Treacy
View profile of Laura TreacyLiam Heylin
View profile of Liam Heylin
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