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International Arbitration Forum

Pierre Mayer

Leading arbitrator Public record 16 published cases

Pierre Mayer

Arbitrator in 16 published cases (presiding or sole arbitrator in 4) before ICSID, PCA tribunals, in renewable energy; solar photovoltaics, mining; lithium concessions, oil and gas; caspian sea oil field disputes.

French ICSID, PCA Renewable energy; solar photovoltaics, Mining; lithium concessions, Oil and gas; Caspian Sea oil field, Portfolio investment; listed shares; Samsung merger

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Overview

In the published awards, Pierre Mayer has been appointed by claimants 3 times and by respondents 7 times, and has presided or sat alone in 4 cases. Of the party appointments, 7 came from States and 3 from investors or companies.

Outcome for the appointing side, where the published decision is clear: claimant prevailed in 33% of the 3 claimant appointments; respondent prevailed in 50% of the 4 respondent appointments. Mixed outcomes count as half.

Appointed most often by: Mexico (1), Romania (1), Bulgaria (1), Senegal (1), Guinea (1).

16Published cases
4As chair or sole arbitrator
10Party appointments
0Dissents recorded

Track record

YearCaseRoleAppointed byInstitution / rulesSectorAward
2026 Bacanora Lithium Limited, Sonora Lithium Ltd., and Ganfeng International Trading (Shanghai) Co. Ltd. v. United Mexican States Co-arbitrator Respondent ICSID · Washington, D.C. Mining; lithium concessions Read award →
2026 Buried Hill Serdar Limited v. Turkmenistan (replaced Philippe Sands; Tribunal reconstituted on 2 April 2026) Co-arbitrator — ICSID · Paris Oil and gas; Caspian Sea oil field Read award →
2025 ACF Renewable Energy v. Bulgaria Co-arbitrator Respondent ICSID · Washington, D.C. Renewable energy; solar photovoltaics Read award →
2025 Mason Capital L.P. and Mason Management LLC v. Republic of Korea Co-arbitrator Respondent PCA · Singapore Portfolio investment; listed shares; Samsung merger Read award →
2025 Cengiz İnşaat Sanayi ve Ticaret A.S v. Libya (confirmed by the ICC Court upon nomination by Claimant) Co-arbitrator Claimant — — Read award →
2022 BSG Resources Limited v. Republic of Guinea Co-arbitrator Respondent — — Read award →
2022 Alverley Investments Limited and Germen Properties Ltd v. Romania Co-arbitrator Respondent — — Read award →
2022 Mason Capital L.P. (U.S.A.) 2. Mason Management LLC (U.S.A.) v. Republic of Korea Co-arbitrator — — — Read award →
2021 Hope Services LLC v. Republic of Cameroon (Proposed for disqualification by the claimant on 7 July 2020; challenge rejected by the non-challenged members on 21 August 2020) Co-arbitrator Respondent — — Read award →
2019 EuroGas Inc. and Belmont Resources Inc. v. Slovak Republic President — — — Read award →
2019 Kontinental Conseil Ingénierie v. Gabonese Republic President — — — Read award →
2018 Dan Cake S.A. v. Hungary President Parties jointly — — Read award →
2016 Menzies Middle East and Africa S.A. and Aviation Handling Services International Ltd. v. Republic of Senegal Co-arbitrator Respondent — — Read award →
2014 Société Industrielle des Boissons de Guinée v. Republic of Guinea President Parties jointly — — Read award →
2008 Jan de Nul N.V. and Dredging International N.V. v. Arab Republic of Egypt Co-arbitrator Claimant — — Read award →
2008 Jan de Nul N.V. and Dredging International N.V. v. Arab Republic of Egypt Co-arbitrator Claimant — — Read award →

Expertise

The legal issues and sectors decided most often in the published awards. Each links to the cases in the database.

Energy Charter Treaty 2Achmea 1intra-EU objection 1Article 16 ECT 1Article 26(6) ECT 1Komstroy 1renewable energy 1photovoltaic 1feed-in tariff 1Article 30 VCLT 1Article 58 VCLT 1European Commission amicus 1EU State aid 1denial of benefits 1enforcement 1FSIA arbitration exception 1NextEra 1forum non conveniens 1lithium 1Sonora Lithium Project 1Ganfeng 1Bacanora 1mining concessions 1La Ventana 1

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Appointing counsel

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Compiled with AI from the published awards and decisions in the Forum’s database. It covers public cases only, counts each case once, and may contain matching errors; every row links to its source. Corrections: info@arbitration.org. All arbitrators →