Máire O'Neill

Partner

Máire is a partner in our Corporate Department and Co-lead of the Firm’s Energy, Renewables, Infrastructure and Utilities practice group. She specialises in transactional corporate with a particular emphasis on private equity transactions (acting for both companies and investors) and M&A transactions involving technology, fintech and energy and infrastructure assets.

Máire has vast experience in private M&A transactions as well as advising scaling and established companies and investors on equity investments in the Irish market as well as venture debt providers on the equity aspects of their funding. She also advises on a wide range of general corporate matters, including corporate restructurings (solvent and insolvent) including domestic mergers and capital reductions.

Máire’s recent transactions includes advising:

Tines on its $125m Series C equity fundraising (with Unicorn valuation, and on its previous Series B, B2, B3 and Series A and A2 fundraisings
Berkshire Partners’ portfolio company Harvey Performance Company on its acquisition of the ATA Group
The sellers of the Beacon Hospital on its disposal to Macquarie Asset Management
Accel who lead the $48m Series A investment in Nuitée Travel
Management Team of construction specialists Ardmac on the sale to Purever
Earlybird Ventures on its equity investment in Ceartas DMCA
The Irish Times on its sale of Beat 102-103 to Bauer Media and its acquisition of Score Beo
FinTech Apata.com on its equity fundraisings
EirGrid plc, the national transmission system operator, in connection with the development and financing of the 700MW HVDC Celtic Interconnector between Ireland and France with a capital cost in excess of €1.6bn and on the national emergency generation projects
Element Investments on the disposal of Terra Solar to Omnes backed Power Capital and Terra Solar II to Orsted
UKG Inc. on its acquisition of the Global Payroll Provider, Immedis Group
Private Equity Firm, CBPE on its acquisition of Irish tech company Signel Web Services
Co-Founder of Taoglas on the majority stake acquisition of Taoglas by US private equity firm Graham Partners
Fenergo Group in connection with its acquisition of Sentinels and previously on its its acquisition by Astorg and Bridgepoint
Carlyle Cardinal on its sale of The City Bin Company to Thorntons Recycling
DCC plc group on its acquisitions of Naturgy Ireland, Jones Oil, Campus Oil and Iskus health
Supporting our Corporate Restructuring & Insolvency teams advising stakeholders in numerous insolvencies and restructurings

2025 Legal 500 EMEA

"Máire O'Neill goes above and beyond to provide an exceptional service to clients. I have found that Máire has an ability to break down issues and provide succinct advice which you are comfortable relying on." "Máire O'Neill is one of the most diligent lawyers that we work with. She is all over the detail and turns complex work around in a timeframe that would be challenging for virtually all other lawyers."

2025 IFLR 1000

Máire is ranked as a Rising Star Partner in IFLR 1000 for Corporate / M&A.