The European firm is merging with one of Ireland’s leading ’boutique’ law firms

10:06, 06 Nov 2025Updated 10:45, 06 Nov 2025

(L-R) Regan Wall Founder and Managing Partner, Feilim O’Caoimh – Fieldfisher Corporate Partner, Kieran Regan – Regan Wall Partner, JP McDowell – Fieldfisher Managing Partner(Image: Ken Walsh)

One of Europe’s leading law firms has announced a huge expansion of its Irish operations, is merging with a renowned ’boutique’ firm in Cork city. Fieldfisher, whose lawyers advise some of the world’s largest corporations, is merging with the Cork-based Regan Wall LLP. The firm’s One South Mall office will be a second Irish location for Fieldfisher, which has offices in Dublin.

Cork’s Regan Wall is one of Ireland’s most active ’boutique’ corporate law firms. It is led by Partners Adrian Wall and Kieran Regan, and is renowned for advising on high-value transactions across various sectors including healthcare, technology and financial services.

Following the merger, 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. It will allow Regan Wall access to Fieldfisher’s international network and platform. The newly combined team in Ireland will be led by M&A and Corporate Partner Feilim O’Caoimh, alongside Adrian Wall.

The expanded Irish team will join the global Fieldfisher M&A team of 60 partners across Europe. Fieldfisher operates 28 offices across 14 countries, including recent opening in Austria, Italy, Poland and Portugal.

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, added: “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.”