The Legal 500

Twitter Logo Youtube Circle Icon LinkedIn Icon

Atsumi & Sakai

Work +81 3 5501 2111
Fax +81 3 5501 2211
London, Tokyo

Tatsuo Yamashima

Work +81-(0)3-5501-2297
Atsumi & Sakai

Work Department

Corporate PG (competition law group); International PG.


Partner (Antitrust and Competition, Labor and Employment, Compliance, Maritime Laws, International Transactions, M&A, Disputes and Litigation Cases).


Anderson Mori & Tomotsune (2005-2012); Norton Rose LLP (Brussels) (July-December 2011); Atsumi & Sakai (2013-).


Japanese and English.


Daini Tokyo Bar Association; Japan Competition Law Forum; European Union Studies Association Japan; Management Lawyers Council; Japan Opera Foundation (Councilor).


The University of Tokyo (B.A., 2002); The University of Tokyo (LL.M., 2004); The Legal Training and Research Institute of Supreme Court of Japan (2005).

Japan: Antitrust and competition

Antitrust and competition – Independent local firms

Within: Antitrust and competition – Independent local firms

At Atsumi & Sakai 'the advice hits all the right points to balance competition law and business risks' and 'truly exceptional' practice head Setsuko Yufu is noted for the 'depth of her understanding of Japanese and foreign competition law as well as her excellent relationship with the JFTC'. A team including Saori Hanada and 'up-and-coming star' Masayuki Matsuura is acting for a Japanese manufacturer in the landmark 'autoparts cartel' investigations launched by the JFTC and foreign regulatory bodies. Meanwhile, Tatsuo Yamashima – who is described as 'one of the outstanding antitrust experts in Japan' – is collaborating with Yufu and recently promoted partner Yusuke Miura to defend a major Japanese shipping company in investigations into a host of anticompetitive business practices by the JFTC, DoJ, EU and other entities. The group also advises clients on general compliance matters, internal investigations and merger clearance mandates in the context of M&A transactions. Recent team developments include the arrival of Hisashi Miyatsuka and of counsel Go Fujimoto from Nishimura & Asahi and of counsel Kohei Murakawa from Squire Gaikokuho Kyodo Jigyo Horitsu Jimusho.

[back to top]

IHL Briefings

If your firm wishes to publish IHL Briefings or articles, please contact Antony Dine on +44 (0) 207 396 9315 or


Japan: Employee Incentives

This country-specific Q&A provides an overview to tax laws and regulations that may occur in  Japan . This Q&A is part of the global guide to Employee Incentives. [Continue Reading]

Back to index

Legal Developments in Japan

Legal Developments and updates from the leading lawyers in each jurisdiction. To contribute, send an email request to
  • Taking control of a Japanese publicly listed company:

    Introductory notes for successfully completing an M&A
  • Yuasa and Hara Business Law News

    Contents of the Issue Law on liability for breach of contract Review on the amendment to the cabinet office order on Corporate Disclosure

    The Minister for Justice, Alan Shatter (“the Minister”), has published the Criminal Justice Bill 2011 (“the Bill”). The main purpose of the Bill is stated to be “…to amend the criminal law to improve certain procedural matters and strengthen Garda investigative powers. The intention is that such improvements will assist in reducing the delays associated with the investigation and prosecution of complex crime, in particular white collar crime.”
  • Japan: New legislative framework for Sukuk

    The new framework passed in May 2011 will provide a solid legal platform for issuing Sukuk Ijarah under Japanese law. NAOKI ISHIKAWA highlights key legal structures and tax treatment in respect of the anticipated Sukuk issuances in Japan.
  • Yakult Bottle Acquired Distinctiveness

    Do you know about Yakult's delicious lactic acid drink which is contained in a small bottle? Yakult's lactic acid drink (hereafter referred to as "Yakult drink") is the most famous lactic acid drink in Japan and today is also being sold in many countries around the world. When you are enjoying Yakult drink, please keep in mind the case mentioned below.
  • Tax: Japan: International Joint Ventures

    Tax on international joint ventures. Country Q&A (Japan).
  • Japan: Recent Developments in Practice and Law

    The successful closing of two Islamic fi nance transactions which was announced in July 2010 by Nomura Holdings have paved a concrete path for Japanese corporations to consider overseas Islamic fi nance markets for their fund raising activities. The fi rst transaction was in Asia for the issuance of Sukuk Ijarah and the second was in the Middle East for the establishment of a Commodity Murabahah facility (Nomura Deals).
  • Renewable energy takes off in Japan

    Like many other countries, Japan has decided to reform its renewable energy (RE) policy, to dramatically increase the use of renewable energy. The core policy mechanism is a feed-in tariff (FIT). This chapter summarises the contemplated Japanese FIT and its practical impact on existing and future investment in this sector, providing an overview of:
  • Licensing - 2010

    Q & A on Licensing in Japan 
  • Law on the Civil Jurisdiction of Japanese Courts over Foreign Countries, etc.

    The Law has been enacted to clarify the scope of application of the civil jurisdiction of Japanese courts over foreign countries, etc., and set exceptions to civil preocedings involving foreign countries, etc., based on the United Nations Convention on the Jurisdictional Immunities of States and their property (UN Convention on Immunities) (see Article 1).