Ibar McCarthy
Dispute Resolution

Halton House
20-23 Holborn
London, EC1N 2JD
United Kingdom
DX248 London/Chancery Lane

Ibar McCarthy

Managing Associate | ONTIER UK · London

Ibar is a barrister with ten years’ PQE across the UK, Ireland, South America and Cayman. Ibar has acted for some of the big global accountancy firms, international funds and high-net-worth individuals, as well as tens of thousands of claimants in group actions in the business and human rights sphere. Ibar cuts to the core of a case quickly – and gives the client an accurate assessment of the merits in plain terms. Ibar’s sector expertise includes defamation, fraud, corporate insolvency and rescue, professional negligence, shareholder disputes, insurance and reinsurance, and medical product liability.
Representative Experience


  • Acting for the creator of Bitcoin in defamation claims taken against various publishers

Business & Human Rights

  • Acting for over 200,000 Brazilian claimants in a case taken in the UK against BHP – arising out of the collapse of the Fundao dam in 2015
  • Acting for 1,500 orange juice producers in a competition/anti-trust claim taken against Jose Luis Cutrale


  • Acting for hundreds of multinational corporate claimants in bringing claims against HMRC seeking restitution for taxes levied in breach of EU Law

Civil Fraud

  • Acting for funds and accountancy firms in litigations arising out of the SAAD and Madoff ponzi schemes
Professional Background

  • University College Dublin (Bachelor of Civil Law) (1st in class) - 2007
  • The Honourable Society of King’s Inns (Barrister-at-Law Degree) - 2011
  • Called to the bar of Ireland – 2011
  • Called to the bar of England and Wales - 2015