Investment Arbitration & Treaty Disputes

The CMS Investment Arbitration team advises both investors and states on claims arising in investment arbitrations under international investment treaties, domestic investment laws, and investment contracts. This dual perspective uniquely positions us to consistently advocate the best possible case for our clients. Our team manages high-value, complex investor-state disputes with precision and strategic insight.

Our specialists advise and act as counsel in investor-state disputes under all relevant arbitration rules, including ICSID, UNCITRAL, ICC, SIAC, LCIA, HKIAC, CIETAC, and SCC. We have successfully represented clients in investment arbitrations involving some of the most significant and evolving issues in the field – such as energy transition, environment, climate change measures, and international taxation. Clients value our consistent commitment to delivering high-quality advocacy in arbitration hearings.

Lawyers in our team also serve as arbitrators in investment treaty cases and are part of ICSID's Panel of Arbitrators and Conciliators. This experience provides us with an even deeper understanding of arbitral reasoning and procedure, further enhancing the quality of our investment treaty arbitration practice.

Our investment arbitration experience spans all major industries, including mining, energy, infrastructure, construction, technology, and financial services. We also advise on investment structuring to ensure that foreign investments receive the best possible protection in the event of a dispute.

As a core element of our successful public international law practice, our Investment Arbitration team also advises on the recognition and enforcement of arbitral awards, as well as on complex issues of state immunity.

With one of the largest international arbitration teams of any law firm, and offices in over 90 cities across 50+ countries, our global platform enables us to combine international expertise with local insight. We possess an in-depth understanding of the political and economic landscapes across all the key investment regions – including Europe, Latin America, Central and East Asia, and Africa – enabling us to provide advice that is both legally sound and strategically informed.