Regan Wall is one of Ireland’s most active corporate law firms, recently ranked third nationally for M&A deal volume in the first six months of 2025 by Experian Market IQ.

Partners Adrian Wall and Kieran Regan, who lead the firm, will join Fieldfisher along with their team from 25 November.

The firm’s offices at One South Mall in Cork will become Fieldfisher’s second location in Ireland.

Fieldfisher’s total headcount in Ireland will increase to 140 professionals, including 18 partners, comprising 124 people based in Dublin and 16 based in Cork.

With a series of recent office openings in Austria, Italy, Poland and Portugal, the firm is now operating from 28 offices across 14 countries.

Following the merger, Fieldfisher’s M&A and corporate team will be jointly led by partner Feilim O’Caoimh and Adrian Wall — joining a global Fieldfisher M&A team of 60 partners across Europe, who regularly act on complex, multi-jurisdictional transactions.

Mergers are becoming increasingly common in the Irish legal sector, with this year also seeing the merger of ByrneWallace and LK Shields to form Byrne Wallace Shields.

Fieldfisher said the combination with Regan Wall is expected to increase its revenues in Ireland by more than 20 per cent.

JP McDowell, managing partner of Fieldfisher Ireland, said: “This merger represents a landmark moment for clients of both Regan Wall and Fieldfisher, and for our business in Ireland.

“By combining Regan Wall’s outstanding domestic M&A expertise with Fieldfisher’s established presence in the Irish market and our broader international footprint, we are creating a uniquely powerful corporate offering.

“Adrian and Kieran bring deep sector-led M&A experience that will significantly enhance our capabilities, positioning our corporate practice among the most prominent in the country.

“This merger is not just about scale, it’s about synergy, quality and delivering exceptional value to clients across Ireland and beyond.”

Adrian Wall, partner at Regan Wall LLP, said: “We’ve built something special at Regan Wall, and when it came to choosing a partner for our growth and expansion, Fieldfisher stood out for us.

“Their collaborative culture, international reach and sector expertise align with our own values and ambitions.

“Kieran and I are genuinely excited to join Fieldfisher, not just for our clients but for our team as well.

“Joining Fieldfisher opens a broader platform for growth and innovation, while continuing to deliver the high-quality, partner-led service we’re known for.”

Feilim O’Caoimh, corporate partner at Fieldfisher Ireland, added: “Having worked opposite Adrian and Kieran on transactions over the years, we’ve seen first-hand the quality of their work and the natural alignment of our values.

“This merger brings together complementary strengths and shared values, and I’m excited about the opportunities it creates for our clients and our team.”

Robert Shooter, managing partner of Fieldfisher, said: “We are thrilled to welcome Adrian, Kieran and the Regan Wall team to Fieldfisher. Their entrepreneurial mindset, strong market reputation and cultural alignment make them an ideal fit for our platform.”