Expert witnesses for
PCA proceedings across
Investment Disputes
The Permanent Court of Arbitration registered 82 new cases in 2023 — its highest single-year intake at that time — with total administered cases reaching 246. Established in 1899, the PCA is the world's oldest intergovernmental dispute resolution organisation and handles the widest range of proceeding types: commercial arbitration, investor-state disputes, inter-state arbitration and technical proceedings under international treaties.
Masin provides expert witnesses for PCA proceedings across investment, energy, maritime, environmental, construction and commercial sectors.
Case types covered by Masin
GAR rankings: Global Arbitration Review Expert Witness Firm Rankings, based on independently verified hearing data submitted to GAR.
The PCA registered 82 new cases in 2023 — a record at the time — bringing total administered cases to 246, the highest in its history. PCA proceedings span commercial arbitration, investor-state disputes, inter-state arbitration and technical disputes between states and private parties.
Natural resources, energy and investment disputes under bilateral investment treaties — the PCA's dominant sector alongside ICSID. Oil, gas, mining, renewables and infrastructure investment claims. Expert evidence on fair market value, lost profits and industry standards.
The PCA has historically administered major inter-state maritime boundary disputes — including the South China Sea arbitration. It also handles commercial maritime disputes and disputes arising from international maritime conventions.
Environmental disputes, transboundary resource claims and waterway agreements — including disputes under international environmental treaties. Expert evidence on environmental standards, damage quantification and ecological impact.
State-contracted infrastructure disputes — often under UNCITRAL Rules where a state or state entity is one party. Delay, quantum and technical expert evidence for road, port, pipeline and energy infrastructure projects.
Commercial disputes under bilateral trade agreements and investment contracts — involving both state entities and private parties. Financial damages, lost profits and economic impact evidence is typically required.
From instruction
to tribunal-ready
What makes this forum distinctive
The PCA is unique in its ability to administer disputes between states, between states and private parties, and between private parties — under a wide range of procedural rules. Its flexibility and neutrality — as an intergovernmental organisation with 122 member states — make it the institution of choice for politically sensitive and technically complex disputes that other forums cannot accommodate.
The people behind the opinion
