The business law firm is the only major domestic Irish law firm to publish financial results each year, though it does not disclose its profits.

It said today that the result reflects robust demand for specialist legal advice, with clients managing continuing regulatory shifts, making investment decisions in an increasingly volatile business environment and managing complex cross-border activity.

Managing partner Will Carmody said: “Businesses are operating under greater regulatory scrutiny while still pursuing growth and investment.

“We are seeing sustained demand for specialist judgement where regulatory risk and commercial outcomes are closely linked.

“Areas of particular focus included technology and financial services regulation, along with infrastructure development.”

Mr Carmody, who has led the firm since January 2023, was recently reappointed as managing partner for a second term beginning 1 January 2026.

He added: “Clients want advice that is practical and aligned with their business objectives. Our priority is to invest in the resources and infrastructure that support our people and, in turn, our clients.”

Headcount also increased by eight per cent over the year, with the firm making three lateral partner hires, three internal partner promotions and seven of counsel promotions during the year.

Mason Hayes & Curran now employs a total of 670 people across offices in Dublin, London, New York and San Francisco.

In 2025, the firm advised on several significant Irish and international mandates, including major transactions across energy, financial services, technology, built environment, healthcare and life sciences.

In the energy sector, notable work included advising HitecVision and Reinova Partners on the launch of Lirion Power, a new Irish renewable energy platform, and its acquisition of six operational onshore wind assets from Greencoat Renewables plc.

The team also advised Eiffel Investment Group in its landmark €323m financing facility for Power Capital Renewable Energy, Ireland’s largest solar independent power producer.

Financial services activity remained strong, with the firm advising on a $4.6 billion financing to Kaseya Group.

Infrastructure is experiencing an “upsurge”, the firm says, with its team advising Ardstone on the purchase of substantial development lands in Clondalkin, which will ultimately comprise some 1,400 residential units along with a community centre and town plaza.

Cross-border transactions continued to be a key driver of activity. The firm advised Kestrel Capital on an investment by IK Partners, Project Delivery Partners Group on its sale to the EFOR Group, Evri on the acquisition of COLL-8, 360 Degree Underwriting on its sale to Ryan Speciality, and XRA 5 Corp on its acquisition of Mural Oncology.

Other notable work included acting for the ICSMA in An Taisce’s challenge to the Fifth Nitrates Action Programme and acting in the recent ComReg case against Sky concerning subscriber information.

Looking ahead, Mr Carmody said: “Our priority is on growth that is strategic and sustainable, supported by deep expertise and consistently excellent client service.

“That is what clients expect, and what we are focused on.”