Signature Litigation
Jamie O'Reilly
Paralegal
E: [email protected]
Jamie O'Reilly
2026 Legal500 UK: Leading Firm 2025 Legal500 EMEA: Top Tier Firm 2026 Chambers: Firm

Biography

Jamie is a Paralegal at Signature’s London office, specialising in Commercial Litigation.

Prior to joining Signature Litigation in 2023, Jamie worked for a year as a Paralegal at a specialist commercial litigation firm. Jamie has worked on a number of group claims across a range of sectors, with particular experience in group financial services claims. He has also assisted on contractual disputes and shareholder disputes.

Jamie has significant experience in disclosure exercises, trial preparations, case management, research and legal drafting.

The quality of their service has always been exceptional. The team excels at developing and coordinating litigation strategies that are not only thorough but also realistic and perfectly aligned with clients' expectations. 
— The Legal 500 EMEA 2026

Experience

  • Representing a technology innovation investment company in bringing and defending claims with the total value of USD 2bn against a multinational investment bank arising from a shareholders’ agreement between them and related to the management of subsidiaries and the valuation of a call option.
  • Representing over 200 institutional claimants with respect to over 1,000 different funds/portfolios in a c.GBP 1.5bn group claim against Standard Chartered Bank regarding allegations of breach of statutory obligations under s.90 and s.90A FSMA 2000. The claim relates to alleged omissions and/or misleading statements in published information arising from alleged misconduct, including breaches of Iranian sanctions. The matter generated significant Court rulings, including from the Court of Appeal, and has settled.
  • Advising a group of institutional investors, in their capacity as both minority noteholders and shareholders in a private group holding company, in relation to potential claims, including unfair prejudice, arising from the conduct of the company and its majority shareholders and noteholders.
  • Representing a large group of retail investors in one of the most significant pieces of international investment litigation in modern history. It concerned breach of contract and misrepresentation claims against major life insurance companies to recover losses in excess of GBP 100m suffered from failed investment bonds. The proceedings in the Isle of Man are ongoing and are the first of their kind in that jurisdiction.
  • Representing the claimant in the groundbreaking GBP 50m dispute against Marks & Clerk LLP in relation to secret commissions earned from longstanding commercial referral arrangements with CPA Global. The case proceeded as a representative action under CPR 19.8 and became a leading authority on the issue of England’s ability to host group action claims.
  • Representing an offshore investment fund in an ongoing English High Court dispute against a law firm with a claim value of c.GBP 40m arising from investments made in a listed African insurance company.
  • Representing a company associated with high-profile high-net worth individual in a High Court high-value dispute with a global aluminium company concerning the transfer of shares in one of the world’s leading metal mining companies.