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Sean O'Reilly

Partner, Cork Office

Seán is a Partner, practising as part of the firm’s Corporate and Commercial team. He has broad-ranging experience as a corporate lawyer. Seán is well respected as a trusted adviser with a depth of legal knowledge and a pragmatic, result-focussed approach in company, contract and commercial law. On the transactional side, Seán has extensive experience in high value mergers and acquisitions work, including a number of high profile sales and acquisitions in the technology, hospitality and healthcare sectors. Seán regularly advises upon the company law issues arising from and implemented a number of complex group re-organisations.

He also frequently advises on equity financing projects and has handled investment work for companies, private investors and venture capital investors.

Seán has lectured in contract law and intellectual property law on the LLB course in Griffith College Cork. Seán has had his published work cited with approval by the Irish High Court.


Advised :

  • on the sale of Compliance and Risks Limited on its sale to Luminate Capital.
  • iNua Group Re-organisation and Equity Fundraising.
  • on the Sale of Oxymem Limited on its acquisition by the DuPont Group.
  • SensL Technologies on its acquisition by ON Semiconductor, a Nasdaq-listed Fortune 500 company headquartered in Arizona.
  • Davy Real Estate on its acquisition of McWilliam Park, Connemara Coast, Harvey’s Point and Ballymascanlon Hotels.
  • Healthcare 21- part sale to private equity in 2018 and its acquisition of O’Flynn Medical in 2022.


University College Cork (BCL Hons), (LLM), (Phd Candidate)


Admitted as a solicitor in Ireland.


  • The Doctrine of State Liability for Breach of EU Law in the Irish Superior Courts (2020) 64 Irish Jurist 64-96
  • Irish Tax Review - Criminalising Corruption: Criminal Justice (Corruption Offences) Act 2018 This article first appeared in Irish Tax Review, Vol. 32 No. 3 (2019) © Irish Tax Institute
  • Köbler in the Common Law Courts: Cooper v Attorney General (2014) 17 Irish Journal of European Law 87
  • E-Commerce and Contract Making (2012) 4(3) Irish Business Law Quarterly 19
  • The Private Enforcement of European Community Law in the Irish Superior Courts (2009) 31 Dublin University Law Journal 324- cited with approval by Edwards J. in in the case of Environmental Protection Agency -v- Neiphin Trading Ltd & Ors [2011] IEHC 67
Sean O’Reilly is a strategic thinker, impeccable on detail and always available and willing to invest time at the front end to bring a deal together.
– The Legal 500 (2023)
pulled together all my thoughts and theories into coherent responses and dealt with daily curve balls
– Eddie Kent, Chief Financial Officer, DPS Group
Sean O’Reilly is superb – he analyses the detail like no other and his commitment to getting a deal over the line is second to none. I cannot rate Sean highly enough.
– The Legal 500 (2024)