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Asia-Pacific Guide
Firm Profile

Atsumi & Sakai

Firm Profile


  • Profile
  • Fukoku Seimei Building 12F
  • 2-2-2 Uchisaiwaicho
  • Chiyoda-ku
  • Tokyo
  • Tokyo-to
  • Japan
  • 100-0011

Firm profile submitted by Atsumi & Sakai

Managing Partners: Mr Hiroo Atsumi
Number of partners: 62
Number of lawyers: 120+
Languages: Japanese, English, Chinese, German, Italian, Korean, Russian, Hindi and Marathi

■ Full-service independent Japanese law firm
■ Frequently recognised as a ‘top tier’ firm by independent legal commentators
■ First Japanese law firm to create a foreign law joint venture
■ Foreign partners with substantial international experience from leading foreign law firms
■ Market leader in diversity and employee satisfaction
■ Only Japanese law firm with a London office - real-time advice on Japanese law for Europe and the Americas
■ Can also advise on the laws of New York, California, England & Wales, India,the PRC, Queensland (Australia), and US and Australian federal law
■ Collaboration with Janssen Foreign Law Office to advise on German law

Practice Areas:
Asset Finance
Banking & Finance
Securitisation, Structured Finance
Securities Regulation
Capital Markets
Real Estate (Acquisition, Financing, Development)
Commercial Contracts
Antitrust / Competition
General Corporate, M&A, Joint Ventures & Foreign Investment
IP, IT, Data Protection & Privacy
Infrastructure, Energy (including Renewable Energy) & Project Finance
Investment Funds, Private Equity & Venture Capital
Dispute Resolution, Domestic & Cross- Border Litigation & Arbitration
Insolvency, Risk Management, Corporate Restructuring
Labour & Employment
Medical / Pharmaceutical Business
International Trade
TMT (Technology, Media & Telecommunications)
Entertainment/ Sports

The Firm:
Atsumi & Sakai is a multi-award-winning, independent Tokyo law firm, and one of the ten largest independent full-service law firms in Japan. The firm was the first Japanese law firm to create a foreign law joint venture, which enables it to admit foreign partners and so offer its clients the quality of service that the modern international business community demands. Expanding from its highly regarded finance practice, the firm now acts for a wide range of international and domestic companies, banks, financial institutions and other businesses, offering a comprehensive range of legal expertise.

International Practice:
Atsumi & Sakai has an outward-looking approach to its international practice, and has several foreign partners and consultants with extensive experience from leading international law firms, so providing its clients with the benefit of both Japanese law expertise and real international experience. As the only Japanese law firm with a London office, it can also provide real-time advice on Japanese law to clients in Europe, the Middle East and Africa, and a more convenient service to clients in the Americas.
The firm’s international work, both inward investment and working with its Japanese clients on offshore matters, has expanded very significantly in recent years, with noticeable increases in cross-border anti-trust actions (advising both as lead and local counsel) and high-profile securities litigation in Japan acting for foreign investors.

As a “foreign law joint enterprise,” the firm now includes Registered Foreign Lawyers licensed in Japan to advise on the laws of the US States of New York and California, the People’s Republic of China, England and Wales, India, the States of Queensland and Victoria (Australia), United States and Australian Federal law, and the laws of the Federal Republic of Germany (in collaboration with Janssen Foreign Law Office). As a member of global legal networks, and having had many years’ experience in working with international law firms, the firm is able to assist clients in the selection of overseas counsel and to work on crossborder transactions with foreign lawyers it is familiar with.

Innovation & Diversity:
The firm constantly seeks to anticipate its clients’ needs for new legal services, most recently those arising from the rapid technological developments in the financial services industry, and strives to provide high-quality and cost-effective services and solutions to support start-up companies. The firm also offers a flexible alternative fee arrangement tailored to meet the specific needs and goals of each client company. Atsumi & Sakai takes a proactive approach to diversity, with nearly 30% of our lawyers being women and 10% foreigners, and encourages its lawyers to maintain a good work/life balance, which has seen the firm recognised as Japan’s leading law firm for employee satisfaction.


  • Fukoku Seimei Building 12F,
  • 2-2-2 Uchisaiwaicho,
  • Chiyoda-ku,
  • Tokyo,
  • Tokyo-to
  • Japan
  • 100-0011
  • Tel +81 3 5501 2111
  • Fax +81 3 5501 2211
  • Email : [email protected]
  • Website :
  • 4th Floor, 50 Mark Lane,
  • London,
  • Greater London
  • UK
  • EC3R 7QR
  • Tel +44-(0)203-696-6540
  • Email : [email protected]
  • Taunusanlage 21,
  • Frankfurt am Main,
  • Hessen
  • Germany
  • 60325
  • Tel +49 69 7474 5050
  • Email : [email protected]