International Arbitration 2026

JAPAN Trends and Developments

Trends and Developments Contributed by: Daniel Allen, Seri Takahashi, Lexi Takamatsu and Yoshinori Tatsuno Mori Hamada

Mori Hamada is widely recognised as an elite law firm in Japan and throughout Asia. When it comes to international disputes, MH has a market-leading international arbitration practice, regularly acting as lead counsel and winning tough, complex cases. MH’s international arbitration team, which includes numerous international lawyers recruited from lead - ing global law firms, has experience leading on inter - national arbitrations at all major global institutions, in - cluding ICC, SIAC, ICSID, JCAA, KCAB, LCIA, THAC,

VIAC, and CIETAC, among others. Its team members also regularly sit as arbitrator. The team’s particular areas of substantive expertise include joint ventures, licensing, intellectual property, construction, trade, and investment treaty arbitration. The team’s experi - ence spans across all key sectors of the global econ - omy, including energy, natural resources, renewables, pharmaceuticals, insurance, chemicals, automotive, and retail, as well as bleeding-edge areas such as space, cryptocurrency, semiconductors, and AI.

Authors

Daniel Allen is a partner at Mori Hamada & Matsumoto, ranked in Chambers & Partners and numerous other guides and directories. He is an experienced advocate and international arbitration specialist,

Lexi Takamatsu is a California- qualified international arbitration specialist with particular experience in commercial and joint-venture

disputes in the Asia region, and she has played leading roles in several bet-the-company arbitrations at our firm. Lexi is a member of the YSIAC council, the IBA Arb40 Steering Committee, and an active member in the Tokyo Daini Bar Association’s committee on arbitration. She can also communicate in Japanese at a professional level.

acting as lead counsel in international commercial and construction arbitration proceedings. Daniel has represented clients in several investment treaty arbitrations, including at ICSID. He also sits as an arbitrator and teaches international arbitration at Kobe University. Before joining MHM, Daniel was a member of the international arbitration group at Freshfields Bruckhaus Deringer, and a patent litigator at Cravath, Swaine & Moore. Daniel graduated from Stanford Law School.

Yoshinori Tatsuno is a partner at Mori Hamada & Matsumoto, admitted in Japan and California. He has extensive experience representing clients in international arbitrations at the ICC, SIAC and JCAA, and multi-

Seri Takahashi specialises in international dispute resolution and has extensive experience representing Japanese and international clients in international arbitration (under various rules such

jurisdictional litigation, and pre-arbitration negotiations in cross-border transactions. He earned his LLM from Harvard Law School in 2015 and worked at Weil, Gotshal & Manges LLP from 2015– 2016. He serves as a member of the ICC Japan Arbitration Committee and Deputy Secretary General of the JIDRC. He is recognised for his market-leading work in arbitration, mediation, and litigation in different directories and rankings.

as those of ICC, SIAC, HKIAC, JCAA, DIAC, and VIAC) and other dispute resolution proceedings including third-party expert determination. Seri has spent a significant part of her career in jurisdictions that are popular arbitration hubs, including Dubai, Hong Kong, and Singapore, and has particular expertise in complex construction disputes.

482 CHAMBERS.COM

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