London image

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.

FIND OUT MORE
Gibraltar image

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.

FIND OUT MORE
Paris image

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.

FIND OUT MORE
Frankfurt image

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.

FIND OUT MORE

Investor-State Arbitration

Signature “demonstrates a strategic approach with careful dealing on every detail of the matter.”

Chambers UK 2026, International Arbitration

Signature Litigation has significant experience in investor-state arbitration which requires specialist knowledge of public international law, investment law, and domestic legal systems. We combine this experience with our in-depth industry and regional knowledge, enabling us to build the most robust case for our clients.

We act for both investors and States in complex, high-value investor-state disputes. Strengthened by our experience of acting on both sides, we anticipate and pre‑empt opposing tactics and calibrate our approach to the realities of sovereign decision‑making, regulatory environments, and political context. This allows us to be efficient and deliver optimal results for our clients.

We pair deep expertise in public international law, investment treaties, and domestic legal systems with sector and regional insight to deliver clear, commercially-grounded strategies.

Many of our cases involve parallel proceedings – including commercial arbitration, civil or criminal investigations, or administrative measures – requiring precise coordination across fora and jurisdictions.

Our clients rely on us to provide pragmatic strategic direction for navigating a complex dispute, from the pre-arbitral stage to final award and enforcement, including emergency measures and settlement strategy.

We also advise investor clients on how to structure their investments to maximise treaty protections, and we advise States on how to reduce their exposure to treaty claims while advancing their policy goals.

Our experience spans bilateral and multilateral investment treaties, investment contracts, and industry‑specific international agreements, under rules including ICSID, UNCITRAL, and the SCC.

KEY INDIVIDUALS

Ioannis is very good at analysing a problem and distilling it to understand the underlying commerciality.

– Chambers UK 2026, International Arbitration

Available, patient, convincing and determined – she leads the client in the right direction.

– Chambers Global 2019

Philip Dunham has deep arbitration experience and expertise, that is genuinely international in nature.

– The Legal 500 EMEA 2025, Dispute resolution: International arbitration

Tsegaye Laurendeau has a strong commercial approach to dispute resolution, which is very appealing to clients.

– The Legal 500 UK 2026, International Arbitration

Neil Newing is responsive, reliable and always provides good legal advice tempered with commercial elements.

– The Legal 500 UK 2025, International Arbitration

She has a brilliant brain. She is known for her strong analytical capabilities and deep understanding of procedural and substantive issues.

– Lexology Index, Arbitration

Pietro Grassi is recognised as a Leading Associate and receives praise for being “standout” and “extremely talented“.

– The Legal 500 UK 2025, International Arbitration

Case Highlights

Representing a European services company in ad hoc UNCITRAL arbitration proceedings against a South American country with respect to claims in excess of USD 250m relating to economic measures targeting the investor’s customs infrastructure investment.

Representing a group of investors in a large-scale mining project in Eastern Europe in a USD 150m UNCITRAL investment treaty arbitration claim against the host State involving allegations of expropriation and breaches of the FET standard.

Representing a global conglomerate engaged in the procurement and export of agricultural commodities with operations across Africa, in relation to a USD 400m investment treaty arbitration against an East African State and involving allegations of expropriation of the investor’s goods and other malfeasances.

Representing a leading Western European privately-owned natural gas supply company in a EUR 400m ECT/ICSID dispute with an Eastern European State arising out of regulatory changes having an adverse impact on the investment.

Acting for a MENA State in defending a USD 600m UNICTRAL arbitration brought by a leading Middle Eastern mobile operator arising out of a tender process for a private GSM licence and a change in local legislation. The dispute involved issues of indirect expropriation and violation of FET standards.

Representing a MENA State in defending a USD 20m claim brought by a Turkish construction company relating to non-payment of government’s debts under a settlement agreement relating to multiple public works projects, and involving issues of denial of justice and expropriation.

Representing a European FTSE 250 exploration and development company in a USD 5.5bn UNCITRAL arbitration against a South Asian State concerning violation of FET standards and compromise of the principle of legal certainty arising out of the adoption of adverse retrospective income tax measures and seizure of the investor’s shares dividends to fulfil the tax demand.

Representing a JV of European construction companies in a USD 330m ICSID dispute with a Middle Eastern State relating to the construction of an urban highway.

Representing a MENA State in defending a USD 500m claim brought by a UAE construction company in ad hoc/UNCITRAL arbitration under the Organisation of the Islamic Conference (OIC) Agreement relating to the termination of its investment in the host State, and involving issues of expropriation and FET standards.

Representing one of the largest privately owned US industrial conglomerates in a USD 400m ICSID dispute against a South American State in relation to the development, construction and operation of two fertiliser factories and concerning an expropriation, violation of FET and full protection and security standards.

Representing an oil exploration company in enforcing a USD 50m LCIA arbitration award in England against a Middle Eastern company and in bringing proceedings against the parent company for fraud. The underlying dispute concerned misappropriation of oil drilling equipment.

Representing a Mediterranean investor in relation to a USD 10bn ECT/ICSID claim against the Republic of Turkey arising out of the expropriation of the investors’ power plant concession rights for the generation, distribution, transmission and marketing of electricity. This case involved high-profile political considerations as well as allegations of forgery.

Representing a European investor in two separate ICSID arbitrations with the total value of USD 400m against a South American State in relation to the largest industrial plants for the production, processing and distribution of glass containers and concerning direct expropriation, as well as violations of FET and full protection and security standards.

Representing a State in the MENA region in an ICSID dispute with the total claim value in excess of USD 5bn in relation to an investment into the operation of a telecoms company in Algeria.

Representing a leading European investor in a USD 500m UNCITRAL arbitration against a Western African State arising out of the expropriation of the investor’s rights in a highly lucrative iron ore project.

Representing a European investor in a claim in excess of USD 250m in relation to ad hoc UNCITRAL/PCA arbitration against a South American State in connection with economic measures targeting an investment in the State’s customs infrastructure.

Representing a US investor in a USD 600m ICSID arbitration against an Eastern European State in relation to the exercise of its rights under oil and gas exploration licences and involving issues of expropriation, as well as systematic arbitrary and unlawful conduct by the State.

Representing a State in the MENA region in USD 2.6bn ad hoc arbitration involving issues of full protection and security, expropriation and FET standards in the context of the Arab Spring events and concerning an investment into local infrastructure (eg. water supply, roads) in remote regions.

Representing a State in the MENA region in a USD 2bn ICSID arbitration initiated by Middle Eastern and other investors concerning alleged violations of investors’ rights in relation to a long-term contract for the supply of natural gas.

Representing investors in an ICSID arbitration involving denial of justice claims against an East Asian State over its failure to pursue a fraud prosecution against its local partner arising out of a USD 50m investment in a copper, gold and iron mining project.

Representing a South American State in a USD 1.5bn ICSID arbitration with a major US oil company arising from the termination of a participation contract to explore and exploit oilfields, and a counterclaim for environmental harm.

Representing an Asian insurance company in ICSID arbitration against a Central European State in relation to claims of USD 1bn arising from the expropriation of an investment in the financial sector.

Representing a leading logistics company in a USD 1bn ICSID arbitration against a State in the MENA region in connection with the expropriation of its investment in the telecommunications sector.