International firm Fieldfisher has doubled its headcount of corporate professionals in Ireland by merging with business firm Regan Wall LLP. Regan Wall will become part of Fieldfisher from 25 November.  

Following the merger, Fieldfisher will have 140 professionals, including 18 partners, in Ireland: 124 based in Dublin and 16 in Cork.

The development is part of Fieldfisher’s wider international expansion strategy. With a series of recent office openings in Austria, Italy, Poland and Portugal, Fieldfisher is now operating from 28 offices across 14 countries.

L to R - Adrian Wall, Feilim O'Caoimh, Kieran Regan, JP McDowell

(L-R): Adrian Wall, Feilim O'Caoimh, Kieran Regan and JP McDowell

Source: Fieldfisher

In a statement, the firms said the merger provides Regan Wall and its clients with access to Fieldfisher’s international network and platform, enabling the team to offer broader capabilities and seamless cross-border support. The expansion is expected to increase Fieldfisher’s revenues in Ireland by over 20%. 

JP McDowell, managing partner of Fieldfisher Ireland, said: '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. 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.'

In its most recent results, for the year to 31 March 2025, Fieldfisher reported firm-wide revenue up 1% to £385m.