About

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.

Chambers Review

Provided by Chambers

Competition/European Law - Ireland

2
Band 2

What the Team is Known For

McCann FitzGerald often assists clients with obtaining competition law clearance for proposed mergers. The law firm also represents clients in investigations into possible cartels or allegations of abuse of dominance, as well as in follow-on damages actions. The team also offers experience in advising on state aid and public procurement matters. It often acts for public bodies and pharmaceutical companies.

Work Highlights

  • McCann FitzGerald advised NFP Intermediate Holdings on the competition law aspects of its acquisition by Aon.

Strengths

Provided by Chambers

Notable Practitioners

Provided by Chambers

Laura Treacy
3
Laura Treacy
3
Band 3

Laura Treacy has a broad competition law practice. Her work covers merger clearance filings, behavioural investigations and state aid mandates.

Laura Treacy is a superstar. She is fantastic, leads the team, and is commercially aware, incredibly experienced and very smart.

Liam Heylin
U
Liam Heylin
U
Up and Coming

Liam Heylin 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. He joined McCann FitzGerald in October 2025.

Liam Heylin is fantastic, he gets back very quickly, manages our expectations well and is always available.

Liam Heylin is very responsive and great to work with.

Liam Heylin is extremely responsive, succinct and pragmatic. His drafting is good and to the point.

Ranked Lawyers at
McCann FitzGerald LLP

Provided by Chambers
Filter by
Band

Ireland

Competition/European Law

Laura Treacy
3
Laura Treacy
3
Band 3
Liam Heylin
U
Liam Heylin
U
Up and Coming

Members

Provided by McCann FitzGerald LLP