Fieldfisher and Regan Wall merge to build leading Irish corporate law team

[Dublin – 5 November 2025] Fieldfisher, a leading European law firm, today announced a significant expansion of its Irish operations through a merger with Regan Wall LLP, one of Ireland's most active boutique corporate law firms.  Renowned for advising on high-value transactions across various sectors including healthcare, technology and financial services, Regan Wall was ranked third nationally for M&A deal volume in the first six months of 2025 according to business research company Experian Market IQ.  Regan Wall is led by Partners Adrian Wall and Kieran Regan, who along with their team will become part of Fieldfisher from the 25^th November 2025, bringing deep expertise in corporate transactions and a strong client base. 

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. 

For Regan Wall and its clients, the merger provides access to Fieldfisher’s international network and platform, enabling the team to offer broader capabilities and seamless cross-border support. 

This latest 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.

The integration of Regan Wall into Fieldfisher's international network further strengthens its position as one of Europe’s most dynamic and fastest-growing law firms.  Fieldfisher Ireland will now operate from Regan Wall's award-winning offices at One South Mall in Cork, establishing its second location in Ireland.

The merger will double the number of Fieldfisher professionals serving the corporate market in Ireland and deepen the expertise available in M&A in particular.  The newly combined team in Ireland will be jointly led by M&A and Corporate Partner Feilim O'Caoimh, alongside Adrian Wall.  This merger marks a significant milestone in Fieldfisher's growth in Ireland, positioning the firm as a leading force in the M&A and corporate advisory market. The expansion is expected to increase Fieldfisher’s revenues in Ireland by over 20%, further consolidating its standing in the Irish legal market.  The expanded Irish team will join the global Fieldfisher M&A team of 60 partners across Europe, who regularly act on complex, multi-jurisdictional transactions. 

The team in Ireland works closely with colleagues across the Fieldfisher network, advising on a broad range of corporate matters including M&A, commercial contracts, governance and compliance, private equity fundraisings, joint ventures, restructurings and corporate finance. The team has specialist expertise in energy sector transactions, with a strong track record advising on the development of onshore and offshore wind farms, battery energy storage system (BESS) projects, and solar energy developments.

Commenting on the merger and Fieldfisher’s continued focus on targeted and sustainable growth, 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, said:

“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.”

This merger marks a new chapter for Fieldfisher Ireland, as it continues to grow its corporate offering and deliver exceptional service to clients across Ireland and beyond.

About Fieldfisher:

Fieldfisher is a European law firm, with market-leading practices in energy and natural resources, technology, financial services, and life sciences.

Our lawyers advise some of the world’s largest corporations including major technology firms, pharmaceutical and life sciences companies, energy suppliers, infrastructure companies, global banks and financial institutions. We take a collaborative approach with clients tailoring our services to their needs and integrating cutting-edge legal technologies into our advice where possible. 

Our international network spans over 2,000 people across 28 offices in 14 countries, enabling us to seamlessly advise clients across time zones and disciplines.

We are based in Amsterdam, Barcelona, Beijing, Belfast, Berlin, Birmingham, Bologna, Brussels, Dublin, Düsseldorf, Frankfurt, Guangzhou, Hamburg, Krakow, Lisbon, London, Luxembourg, Madrid, Manchester, Milan, Munich, Paris, Porto, Shanghai, Silicon Valley, Vienna and Warsaw.