Fieldfisher merges with Regan Wall, expanding Irish team and boosting revenue by 20%
International law firm 5 has announced a merger with Regan Wall LLP, doubling its corporate team in Ireland and significantly expanding its footprint in the Irish legal market. The merger will take effect on 25 November 2025.
Following the combination, Fieldfisher will employ 140 professionals in Ireland, including 18 partners with 124 staff based in Dublin and 16 in Cork. The move marks another milestone in Fieldfisher’s continuing international growth strategy, which has recently seen new offices open in Austria, Italy, Poland and Portugal. The firm now operates from 28 offices across 14 countries.
In a joint statement, both firms said the merger would give Regan Wall and its clients access to Fieldfisher’s global network, offering an expanded range of legal services and cross-border capabilities. The partnership is expected to increase Fieldfisher Ireland’s revenue by more than 20%.
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JP McDowell, managing partner of Fieldfisher Ireland, said the merger represented a strategic opportunity to strengthen the firm’s position in the Irish market.
“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,” McDowell said. “This merger is not just about scale, it’s about synergy, quality and delivering exceptional value to clients across Ireland and beyond.”
Regan Wall LLP, known for its strong record in M&A, corporate and commercial law, has built a client base across Ireland’s business and financial sectors. The merger will see its entire team join Fieldfisher, further enhancing the firm’s national presence and strengthening its relationships with domestic and international clients.
Adrian Wall, partner at Regan Wall, said the decision to merge was guided by a shared commitment to growth and client service. “We’ve built something special at Regan Wall, and when it came to choosing a partner for our expansion, Fieldfisher stood out for us. Their collaborative culture, international reach and sector expertise align with our own values and ambitions,” he said.
Fieldfisher’s Irish operations have grown steadily since the firm entered the market, reflecting the country’s status as a hub for technology, finance and life sciences. The firm’s combination of domestic expertise and global resources has allowed it to support clients across a range of sectors, from M&A transactions to regulatory advice and complex cross-border work.
The firm’s most recent financial results, for the year ending 31 March 2025, showed firm-wide revenue rising 1% to £385 million. Fieldfisher attributed the modest growth to investment in international expansion and a deliberate focus on consolidating core practice areas.
The addition of Regan Wall is expected to accelerate that growth, providing greater depth in corporate and transactional services while expanding client access in Ireland’s second city, Cork.
With this merger, Fieldfisher strengthens its position as one of the fastest-growing international firms in Europe. The move follows a series of similar strategic expansions across the continent, reinforcing the firm’s long-term commitment to integrated, cross-border legal service delivery.
As the Irish legal market continues to attract international interest, particularly post-Brexit, Fieldfisher’s expanded presence positions it to compete more effectively in both domestic and multinational transactions.
The merger highlights the ongoing trend of international firms deepening their investment in Ireland, as Dublin and Cork continue to grow as major legal and financial centres within the EU.