OVERVIEW
Jonathan is an experienced litigator with a focus on commercial and competition disputes. He joined Hausfeld in November 2021.
Expertise
Jonathan trained and qualified at Pinsent Masons LLP, acting on a wide variety of contentious and advisory matters. Combined with his time at Hausfeld, he has developed extensive experience acting for claimants and defendants across a spectrum of commercial litigation matters, including disputes involving breach of contract, post-acquisition warranty and indemnity claims, professional negligence, civil fraud and unfair prejudice petitions.
Jonathan also has specialist expertise acting for claimants in group claims in both commercial and competition litigation matters, including collective proceedings against global tech giants and securities litigation on behalf of classes of investors. As part of his group litigation practice, Jonathan has developed considerable litigation funding experience, working with and on behalf of funders in order to secure the best possible outcomes for his clients.
Jonathan has represented clients in all divisions of the High Court, the Competition Appeal Tribunal and the Court of Appeal. He is a keen proponent of alternative dispute resolution, particularly mediation and expert determination.
Clients
Jonathan has gained a diverse client base including UK and international corporations in the financial services, technology, manufacturing, outsourcing, energy and retail sectors, high net worth individuals and public sector clients such as government agencies in the UK and abroad.
EDUCATION
Legal Practice Course, University of Law
GDL, BPP University
History degree, University of York
BAR ADMISSIONS
Solicitor, England and Wales, 2017
AFFILIATIONS
Jonathan is an active member of AIJA (the International Association of Young Lawyers) and the LSLA (the London Solicitors Litigation Association).
EVENTS
WHAT OTHERS SAY
Legal 500 UK
Jonathan Amior has been recognised as a key lawyer, he is 'down to earth and friendly, yet on top of all the details.’ and ‘…always available and responsive'. - Commercial Litigation Premium, 2025
Experience
Commercial & Financial Disputes
Examples of Jonathan’s commercial disputes experience include acting for:
- The entrepreneur founder and seller of a healthcare business, defending post-acquisition warranty and indemnity claims in the High Court brought by the private equity buyer and securing substantial pre-action recoveries in multiple negligence claims against each of the seller’s former accountants, lawyers and financial advisers.
- Qatar Airways, in a strategic role arising out of its multi-billion dollar dispute with Airbus concerning its A350 and A321 Neo fleets (one of The Lawyer’s Top 20 Cases of 2023).
- An international energy developer in Commercial Court proceedings involving a dispute with an international investment bank relating to FX trades under the 2002 International Swaps and Derivatives Association (ISDA) Master Agreement.
- The developer of intelligent flight savings software, in its claims against a global travel corporation, alleging the misappropriation of the client’s software.
- Institutional investors with s90/90A FSMA claims against listed companies.
- Representative parties to group litigation brought pursuant to CPR 19.8.
Before Hausfeld, his experience included:
- Acting for the Danish Tax Agency, Skatteforvaltningen, in fraud and misrepresentation claims against over 100 defendants arising from “cum ex” dividend arbitrage trading, where withholding tax refunds on dividends were allegedly claimed despite there being no shares or dividends paid. The proceedings were described as “one of the largest and most complex pieces of litigation to be heard in the Commercial Court” (one of The Lawyer’s Top 20 Cases of 2021 and 2024).
- Representing a local authority in an expert determination concerning a contractual dispute to an enforce an option to buy land with a developer.
- Defending complex unfair prejudice petitions under s994 of the Companies Act 2006 for a private equity investor.
- Acting as part of a s166 Financial Services and Markets Act skilled person team in a major review into the mis-selling of interest rate hedging products by two high-street UK banks.
Antitrust / Competition
At Hausfeld, Jonathan is part of the teams acting for:
- Dr Rachael Kent, the class representative in CAT proceedings on behalf of some 19.6 million eligible UK iPhone and iPad users relating to excessive and unlawful charges by the Apple App Store. The claim alleges that Apple’s conduct violates section 18 of the UK Competition Act 1998 and Article 102 of the Treaty on the Functioning of the European Union.
- a proposed class representative in collective proceedings filed against Amazon.com, Inc. seeking damages on behalf of consumers for alleged anticompetitive conduct in relation to Amazon’s ‘Buy Box’.
At his previous firm, Jonathan, was part of the legal teams:
- Acting for a claimant in multilateral interchange fee claims against Visa and MasterCard.
- Advising a claimant impacted by the auto-parts cartel infringement.
- Advising university clients in relation to claims for an alleged abuse of a dominant position in the market for graduation gowns.