Case Details

Hiroshi Osumi v. Swiss Confederation (ICSID Case No. ARB/26/1)

Subject of Dispute:

Debt Instruments
Economic Sector:

Finance
Instrument(s) Invoked:

JSFTEPA (Agreement on Free Trade and Economic Partnership between Japan and the Swiss Confederation)
Applicable Rules:

ICSID Convention - Arbitration Rules

(a) Original Proceeding

Claimant(s)/Nationality(ies):

Hiroshi Osumi (Japanese)
Respondent(s):

Swiss Confederation (Swiss)
Date Registered:

January 7, 2026
Date of Constitution of Tribunal:

May 21, 2026

Composition of Tribunal

President:

Marinn CARLSON (U.S.) - Appointed by the Parties
Arbitrators:

Peter TURNER (British, French) - Appointed by the Claimant(s)
Gabriel BOTTINI (Argentine, Spanish) - Appointed by the Respondent(s)

Party Representatives

Claimant(s):

Mori Hamada & Matsumoto, Tokyo, Japan
Respondent(s):

State Secretariat for Economic Affairs SECO, Bern, Switzerland
LKK Arbitration Ltd, Geneva, Switzerland
Language(s) of Proceeding:

English
Status of Proceeding:

Pending
Latest Development:

September 7, 2026 - The Claimant files observations on the Respondent’s observations of August 31, 2026.

(a) Original Proceeding

Published Decisions

Procedural Order No. 1

Procedural Order No. 2

Available on the ICSID Website

Procedural Order No. 1 (July 10, 2026) English (Original)

Procedural Order No. 2 (July 10, 2026) English (Original)

(a) Original Proceeding

Date	Development
January 7, 2026	The Secretary-General registers a request for the institution of arbitration proceedings.
February 24, 2026	Following appointment by the Claimant, Peter Turner (British/French) accepts his appointment as arbitrator.
March 31, 2026	Following appointment by the Respondent, Gabriel Bottini (Argentine/Spanish) accepts his appointment as arbitrator.
May 21, 2026	Following appointment by agreement of the parties, Marinn Carlson (US) accepts her appointment as presiding arbitrator.
May 21, 2026	The Tribunal is constituted in accordance with 37(2)(b) of the ICSID Convention. Its members are: Marinn Carlson (US), President, appointed by agreement of the Parties; Peter Turner (British/French), appointed by the Claimant; and Gabriel Bottini (Argentine/Spanish), appointed by the Respondent.
June 29, 2026	The Tribunal holds a first session by video conference.
July 10, 2026	The Tribunal issues Procedural Order No. 2 concerning confidentiality and transparency.
July 10, 2026	The Tribunal issues Procedural Order No. 1 concerning procedural matters.
August 3, 2026	The Respondent files a request for security for costs and a request concerning advances on costs.
August 24, 2026	The Claimant files observations on the Respondent’s requests for security for costs and advances on costs.
August 31, 2026	The Respondent files a response to the Claimant’s observations of August 24, 2026.
September 7, 2026	The Claimant files observations on the Respondent’s observations of August 31, 2026.