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London

Founded in 2012, Signature Litigation has grown into one of London’s pre-eminent specialist dispute resolution practices. From the outset, we set out to do things differently: a conflict-free, disputes-only platform designed to give clients the undivided focus and strategic agility that complex, high-stakes matters demand.

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Gibraltar

Established in 2017, Signature Litigation's Gibraltar office was founded to address growing demand for specialist expertise in commercial litigation and private wealth disputes on the Rock.

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Paris

Signature Litigation AARPI houses one of France’s most enviable product liability practices, with the team also handling commercial and corporate litigation, insurance and reinsurance, toxic tort and ESG, civil fraud and asset tracing, international arbitration, administrative and public law.

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Frankfurt

Frankfurt has emerged as one of Europe's foremost financial and commercial centres and, increasingly, as a bridge between European and Asian markets. With that growth comes an increasing demand for sophisticated dispute resolution. Signature Litigation established its Frankfurt office to meet this need, bringing our conflict-free, disputes-only platform to the German market.

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Katrin Harter

Associate

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

The team is excellent, always ready to meet our needs and anticipate risks and expectations.

– The Legal 500 EMEA 2026
Very good advice, to the point and with attention to detail. 
– The Legal 500 EMEA 2026

Katrin is an Associate (Barrister) at Signature’s London office, specialising in international commercial litigation and arbitration.

Katrin has a strong background in international disputes and complex litigation. She has worked on a broad range of high-profile, multi-jurisdictional matters, representing both corporate clients and individuals in various industries. Katrin’s experience includes various types of group litigation both on Claimant and Defendant side. Her practice is particularly focused on fraud, contractual matters, regulatory compliance, and cross-border litigation. Throughout her pupillage, she has also gained valuable experience in international sanctions and export control matters.

Katrin was involved in matters proceeding in England, Bermuda, Singapore, the Isle of Man, the BVI, Cyprus and Switzerland. Her extensive international experience and technical expertise enable her to manage disputes spanning multiple jurisdictions and legal systems. With her multilingual background and proficiency in both common law and civil law systems, she is well-equipped to navigate complex legal challenges across diverse sectors.

Prior to joining Signature Litigation, Katrin studied law in both England and Germany, completing an undergraduate degree in English and German Law at King’s College London, followed by a Master’s in German and European Law and Legal Practice at Humboldt University Berlin and the BCL at the University of Oxford.

Katrin was called to the English Bar in 2022. Katrin is a native German speaker and speaks fluent English.

  • Representing over 130 institutional shareholders in Barclays Plc claiming over GBP 500m in losses arising out of allegations arising under s.90 and 90A FSMA. The allegations arose from misconduct arising out of Barclays’ liquidity dark pool and settlement agreements entered into between Barclays and the New York Attorney General and the Securities and Exchange Commission. This case was at the forefront of certain legal issues arising under s.90A FSMA including the issue of passive investors’ rights to pursue redress, as well as the right by shareholders to obtain inspection from the company of legally privileged documents.
  • Representing Renault and certain of its Authorised Dealerships in the NOx Diesel Emissions Group Litigation in London, a claim of unprecedented scale in the English court, in which more than 1.6 million claimants have issued claims against car manufacturers (and others). The case involves a 12-week technical trial which started in October 2025 and will conclude in March 2026.
  • Representing over 200 institutional claimants with respect to over 1,000 different funds/portfolios in a c. GBP 1.5bn group action claim against Standard Chartered involving allegations of untrue or misleading statements and omissions in information published by the Defendant to the market giving rise to claims under s90 and s90A Financial Services and Markets Act 2000.
  • Representing the investment fund of Georgian billionaire Bidzina Ivanishvili and his family in a dispute valued at USD 600m–USD 1.2bn against Credit Suisse entities for the recovery of losses arising out of mismanagement of his investment portfolio through a range of trust arrangements, which have led to criminal proceedings against the bank’s fund managers. This case involved parallel proceedings in Switzerland, Singapore, New Zealand and Bermuda.
  • Representing the beneficiaries of a Panamanian Foundation in claims for losses up to USD 500m incurred due to the fraudulent mismanagement of the offshore trust structure by rogue fiduciaries. The claim included applications for interim relief (including worldwide freezing orders, asset disclosure orders and information orders) in the Caribbean, Europe and Asia, in support of an ICC arbitration seated in Panama.
  • Representing a large group of retail investors in a ground-breaking piece of international investment litigation. 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 CPA Global.

Article: Naming and shaming after the FCA’s recalibration: Where are we now?Financial Reporter – 5 March 2026

Article: Pupillage special: Pointers for new pupils – Counsel Magazine – 8 September 2025