当事務所の佐藤有紀が、トムソン・ロイター社による調査において、クライアントの皆様からの推薦に基づき「Stand-out Lawyer（卓越した弁護士）」の一人に選出されました。

この度、当事務所の佐藤有紀が、トムソン・ロイター社による調査において、クライアントの皆様からの推薦に基づき「Stand-out Lawyer（卓越した弁護士）」の一人に選出されました。「実務に即した具体的なアドバイス」との評価いただいたことは大変光栄です。今後も、より精度の高い、そして現場に寄り添ったリーガルサービスを提供できるよう精進してまいります。

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We are pleased to announce that Yuki Sato was named as a Thomson Reuters Stand-out Lawyer

We are pleased to announce that Yuki Sato was named as a Thomson Reuters Stand-out Lawyer.This credential is awarded to lawyers who have been independently nominated by clients for their exceptional service and legal expertise. This year’s recognition highlights Yuki’s ability to deliver accurate, high-quality advice and practical solutions.We remain dedicated to providing our clients […]

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Our firm has been selected as a ”Leading Firm” by Legal 500 in Investment Funds 2026 in Japan.

Our firm has been selected as a ”Leading Firm” by Legal 500 in Investment Funds 2026 in Japan. Ms. Yuki Sato also was selected as “Leading Partner” in Investment Funds respectively.

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Our firm has been selected as a ”Leading Firm” by Legal 500 in FinTech 2026 in Japan.

Our firm has been selected as a ”Leading Firm” by Legal 500 in FinTech 2026 in Japan. Mr. So Saito also was selected as “Leading Partner” in FinTech respectively.

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Office Relocation and Expansion Notice

We are pleased to announce that Marunouchi office has relocated to a larger space on the 8th floor (Suite 842) of the same building to support our business growth and organizational expansion.Operations will commence at our new office on Monday, February 16, 2026. This expansion allows us to enhance our operations and provide even more […]

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AI Regulation in the EU and Japan: A Practical Guide for Cross-Border Businesses

Hard Law, Soft Law, and What Companies Need to Know Before Entering Both Markets Executive Summary Artificial intelligence regulation is rapidly becoming a decisive factor in cross-border business strategy. Companies developing or deploying AI systems in multiple jurisdictions must navigate fundamentally different regulatory models, particularly in the European Union and Japan. This article provides a […]

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Jun Kashio has joined the firm and is currently working at our Marunouchi Office.

Jun Kashio has joined the firm and is currently working at our Marunouchi Office.

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Marunouchi Office / Newsletter (Vol.1)

[Marunouchi Office] 10th Anniversary Commemorative Newsletter (Vol.1)In celebration of So & Sato Law Offices’ 10th anniversary, the Marunouchi Office is pleased to publish its first newsletter (Vol.1).This issue features our recent affiliation with global networks, the expansion of our team with new members, and insights on the latest legal developments. [PDF] Read Marunouchi Office Newsletter […]

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Overview of the Draft Report on the Cryptoasset System Working Group and Its Impact on Practice

1. Compilation of the Draft Reportand Future Outlook The Financial Services Agency’s Financial System Council “Working Group on Cryptoasset Systems” has been examining the revision of cryptoasset regulations since its establishment on June 25, 2025. At the sixth meeting held on November 26, a draft report summarizing the results of the deliberations was mostly approved. […]

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Our firm was selected as one of the “Fintech” and “Technology, media & telecommunications” in 2025 Japan Law Firm Awards.

Our firm was selected as one of the “Fintech” and “Technology, media & telecommunications” in 2025 Japan Law Firm Awards.

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ACCELERATING INNOVATION IN BUSINESS, FINANCE, AND TECHNOLOGY.

Combining years of experience in the field of corporate deals and capital markets with an in-depth understanding of new technologies we are uniquely positioned to develop innovative solutions for our clients.

Services

The FinTech industry is without doubt one of the most dynamic industries globally. Sitting at the intersection between traditional finance and technology it is also one of the most complex regulatory areas. We enjoy working in this environment and are consistently ranked among the top FinTech lawyers in Japan.

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Mergers and acquisitions are key strategies for companies to stimulate growth, gain a competitive advantage and increase their market share. We assist our clients in structuring their deals, setting up joint ventures and help them with their general corporate matters. Our clients range from early stage start-ups to established national and international players.

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Our lawyers have worked for leading law firms in the US, UK, Hong Kong and Singapore for many years and have a wealth of experience in debt and equity issues, derivatives and structured products. Having a strong foothold in FinTech, we are further ideally positioned to help our clients to stay ahead of the curve and to drive financial innovation.

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Our services cover the whole lifecycle of funds and range from the structuring and formation to capital raising, investment, operation management, and liquidations. We further assist foreign funds with their regulatory matters and portfolio investments in Japan.

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Companies developing or deploying cutting-edge technologies do not only require specialized knowledge of the respective technologies but also an in-depth understanding of the legal risks and the regulatory environment. Our lawyers constantly expand their knowledge to stay ahead of the curve and advise clients on matters relating to product regulation, IP and personal data protection.

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Asia Business Law Journal
Awarded in the “Technology, Media & Telecommunications” category in 2023 Japan Law Firm Awards
Awarded in the “FinTech” and “Technology, Media & Telecommunications” categories in Japan Law Firm Awards (2024–2025)

Best Lawyers
So Saito:
Recognized for Financial Institution Regulatory Law and FinTech Practice (2021–2023)
Recognized for Banking and Finance Law, Financial Institution Regulatory Law, and FinTech Practice (2024–2026)

Yuki Sato: Recognized for Corporate and Mergers and Acquisitions Law (2022–2026)

Chambers & Partners
So Saito has been ranked as a Top FinTech Lawyer from 2019 to 2026.

Legal 500 Asia Pacific
Our firm received high recognition in the “FinTech” and “Investment Funds” categories.
So Saito: Leading Individual in the “FinTech” category (2022–2025)
Yuki Sato: Recognized in the “Investment Funds” category (2022–2025)

Updates

News

16 February 2026

We are pleased to announce that Marunouchi office has relocated to a larger space on the 8th floor (Suite 842) of the same building to support our business growth and organizational expansion.
Operations will commence at our new office on Monday, February 16, 2026.

This expansion allows us to enhance our operations and provide even more responsive and seamless service to our valued clients. Our entire team is committed to meeting your expectations in this new environment.

We look forward to welcoming you to our new office whenever you are in the area.

New Address:
Suite 842, 8F Shin-Kokusai Building, 3-4-1 Marunouchi, Chiyoda-ku, Tokyo
Phone: 03-6275-6980 (No change to the phone number)

24 February 2026

Our firm has been selected as a ”Leading Firm” by Legal 500 in FinTech 2026 in Japan. Mr. So Saito also was selected as “Leading Partner” in FinTech respectively.

24 February 2026

We are pleased to announce that Yuki Sato was named as a Thomson Reuters Stand-out Lawyer.
This credential is awarded to lawyers who have been independently nominated by clients for their exceptional service and legal expertise. This year’s recognition highlights Yuki’s ability to deliver accurate, high-quality advice and practical solutions.
We remain dedicated to providing our clients with the highest level of professional legal support.

30 January 2026

An interview with So Saito of our office was featured in Iolite Vol.18.

24 February 2026

Our firm has been selected as a ”Leading Firm” by Legal 500 in Investment Funds 2026 in Japan. Ms. Yuki Sato also was selected as “Leading Partner” in Investment Funds respectively.

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Events

18 February 2026

Yu Mizushima spoke at SBI Center for Financial and Economic Research “Legal Affairs in the Quantum Computing Era”.

10 February 2026

Yu Mizushima spoke at Business+IT's “Legal Affairs in the Quantum Computing Era: Legal Issues in Cybersecurity, National Security, and Practical Responses to Post-Quantum Cryptography".

14 May 2025

So Saito spoke at Lisse Co., Ltd."How AI works and the forefront of corporate applications".

6 March 2025

So Saito spoke at IOSCO Fintech Task Force (FTF) “Security Token in Japan”.

16 December 2024

So Saito spoke at Liberal Democratic Party’s Parliamentarians for Blockchain Promotion “Crypto Assets and Securities Regulation”.

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