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Connor Cassidy is a partner in the Commercial Litigation and Dispute Resolution Group at Matheson, and a member of the firm's Regulatory Investigations team. Our Regulatory Investigations team works closely with technical experts from our non-contentious practice areas, including the Technology and Innovation, Financial Institutions, Asset Management, Finance and Capital Markets and Corporate groups to ensure a seamless service which understands and meets our clients' regulatory requirements and priorities.

Connor has over ten years' experience advising a variety of clients in complex disputes including alternative methods of dispute resolution, with particular expertise in technology / financial services disputes. Connor also advises clients on contentious regulatory matters, often involving a number of regulators, law enforcement authorities and jurisdictions. His clients include global technology companies, financial institutions, insurers, fund managers, fintech firms, directors, senior executives and shareholders and other regulated entities and persons. Connor has significant experience in handling complex regulatory investigations and advising on issues relating to legal professional privilege.

Connor's practice also includes advising clients in respect of white collar crime and corporate offences, fraud, anti-bribery and corruption compliance, as well as lobbying compliance under the Irish and EU regimes.

He has authored a number of publications including; The Practitioners Guide to Global Investigations (Irish Chapter) 2023; Global Investigations Review: Irish Chapter (2022); Getting the Deal Through: Financial Services Litigation 2020: Getting the Deal Through: Construction (White Collar Crime section) 2020; The Practitioners Guide to Global Investigations 2020 (Ireland); ICLG Business Crime; and Getting the Deal Through: Dispute Resolution 2020.

Connor joined the firm in 2016, having previously qualified and practised as a barrister at the Bar of Northern Ireland.

Experience Highlights 
  • Advising a national healthcare provider in respect of an inquiry by the Irish Data Protection Commission resulting from a data breach incurred as a result of a cyber-attack.
  • Advising a global technology company in relation to complaint handling and engagement with the Irish Data Protection Commission under the amicable resolution procedure.
  • Advising a global vehicle manufacturer in respect of complex, multi-party, multi-proceedings, product liability litigation with estimated losses in excess of €60 million.
  • Advising a global technology company in relation to an internal investigation prompted by a protected disclosure made by a whistle-blower.
  • Advising multiple clients in the defence of data breach claims (including for non-material loss) under the GDPR.
  • Advising clients across a number of industry sectors on potential fraud, bribery and corruption offences and reporting obligations under section 19 of the Criminal Justice Act 2011.
  • Advising a number of clients who have been the victim of cyber-attacks, including in respect of their regulatory engagement and litigation management post-incident.
  • Managing the sole mandate for handling Irish consumer law claims for a number of clients operating in the technology, manufacturing and distribution sectors.
  • Acting for a number of clients across various industry sectors with regards to warranty and indemnity claims under Share Purchase Agreements.
  • Advising various regulated financial institutions in investigations and enforcement proceedings (including the Central Bank of Ireland, the ODCE, and Financial Services and Pensions Ombudsman).
  • Acting for financial services providers in relation to administrative sanctions investigations under the Central Bank’s regulatory enforcement regime.
  • Advising Macquarie Asset Management in relation to its agreement to acquire the Beacon Hospital in Dublin, subject to customary regulatory approvals. 
'Connor Cassidy stands out.’
White Collar Crime: The Legal 500 2024

Connor has been recognised as a Key Lawyer
White Collar Crime: European Legal 500 2021, 2022, 2023




Queen's University Belfast, Law LLB, First Class Honours, 2007 – 2010

Institute of Professional Legal Studies Northern Ireland, Bar Course, Distinction, 2011-2012

Law Society of Ireland, Qualified Lawyers Transfer Test, 2016