Arbitration
We handle some of the world’s most demanding international commercial and investor state arbitrations, delivering proven success in complex, high stakes disputes and earning recognition as a GAR Top 30 firm.
Pinsent Masons is known for its work on large, complex international arbitrations, particularly in the energy and infrastructure sectors, and for acting on politically sensitive commercial and investment treaty disputes. Our team brings together sector expertise, international arbitration experience and a genuinely global platform to support clients in their most critical disputes.
Clients describing us as "‘the best of the best - a team that is at the absolute top of its game and a market-leader in international arbitration."
Out-Law / Your daily need to know
Our latest work
Our advisers act on domestic and international projects of all shapes and sizes, working with many of the leading names across this diverse sector. Browse our experience below, or use the filters to look-up recent work in particular geographies and legal disciplines.
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ArcelorMittal S.A.
Representing ArcelorMittal S.A. in an investor-State arbitration against the Italian Republic. The dispute concerns a series of unlawful measures adopted by Italy in violation of the Energy Charter Treaty (the “ECT”). The case was registered by the ICSID Secretary-General on 25 July 2025 under ICSID Case No. ARB/25/34.
- Italy and United Kingdom
- Technology, Science & Industry
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Eurohold Bulgaria AD and Euroins Insurance Group AD
Representing Eurohold Bulgaria AD and its insurance subsidiary Euroins Insurance Group in treaty claims against Romania under an intra EU BIT. The case is the first to challenge the termination of the sunset clause following the Termination Agreement for all intra EU BITs and is closely watched by the international arbitration community.
- Cross-border
- Financial Services
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Client confidential
Advising on two complex English law governed HKIAC arbitration proceedings arising from the construction of a large-scale ethane gas processing facility in Russia. With inter-office/continent collaboration, we are progressing both arbitrations whilst also having obtained two permanent anti-suit injunctions, one permanent anti-enforcement and one interim anti-enforcement injunction in the Hong Kong Courts.
- Germany and United Kingdom
- Energy & Natural Resources
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Client confidential
Acting for a Middle Eastern energy company in enforcing one of the largest energy awards issued in recent years. The team advises on multi jurisdictional strategy across the Middle East and Europe, navigating issues relating to sanctions, sovereign immunity, public policy defences and asset tracing.
- Iran and Qatar
- Energy & Natural Resources
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Client confidential
Advising an independent power producer in relation to a dispute against its EPC contractor arising from the construction and delivery of rooftop photovoltaic solar systems across three sites in Thailand and the termination of the EPC contracts. SIAC arbitration seated in Singapore.
- Thailand
- Energy & Natural Resources
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Client confidential
Advising an international main contractor in relation to an ICC arbitration AED 30 million raised against it by its subcontractor in relation to claims and counterclaims relating to two substation projects.
- United Arab Emirates
- Energy & Natural Resources
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Client confidential
Advising an international contractor in relation to claims raised against it in the Saudi Courts in the value of SAR 1.2billion (USD 320 million) relating to defective construction of 400 villas in Saudi Arabia.
- Saudi Arabia
- Infrastructure
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Client confidential
Advising an international contractor JV in respect of complex and technical claims in the value of SAR 2.4 billion (USD 640 million) relating to a SAR 6 billion tunnelling project.
- Saudi Arabia
- Infrastructure
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Client confidential
Represented a regional MEP contractor in DIAC arbitration in relation to MEP works on a major hotel development in Dubai.
- United Arab Emirates
- Infrastructure
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Client confidential
Advised a major international contractor, in an arbitration instituted by its welding subcontractor relating to claims for additional payment arising from welding works performed on a power plant project, together with counterclaims for recovery of overpayment of contract price adjustment. Amount in disputes was in excess of ZAR 500m.
- South Africa
- Energy & Natural Resources
Our expertise, at your disposal
With over 490 partners and 3000 people around the world, we are well-placed to support you across a full range of legal and advisory services.
Latest press releases
Show me all press releasesPinsent Masons achieves highest number of Legal 500 UK rankings
Multinational law firm Pinsent Masons has once again topped the Legal 500 UK rankings, securing both the highest number of overall rankings and the most Tier One rankings.
Pinsent Masons advises EDF power solutions on Five Estuaries Offshore Wind Farm acquisition
Multinational law firm Pinsent Masons has advised long-standing client EDF power solutions on its acquisition of a 33.3% interest in the Five Estuaries Offshore Wind Farm project from RWE, marking a significant addition to EDF power solutions’ UK offshore wind development portfolio.
Pinsent Masons bolsters Dublin office with new corporate tax partner James Quirke
Multinational law firm Pinsent Masons has appointed new partner James Quirke to lead its corporate tax team in Dublin.
Sylvia Tonova
Partner, Co-Head of International Arbitration, Head of Investment Arbitration and Public International Law
