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Atsumi & Sakai

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

Hiroyuki Sanbe

Work +81 (0)3 5501 2276
Atsumi & Sakai

Work Department

Core member of M&A team and FinTech team.  Also, member of Finance PG (finance and real estate), Litigation Insolvency PG, and International PG.


Partner. M&A and Corporate (including domestic and cross-border mergers & acquisitions, corporate group restructuring, and TOB); Domestic and international dispute resolution (including disputes related to hostile takeovers); Corporate and financial regulatory compliance and investigations; Corporate risk and crisis management; Labor and employment; Finance (banking, capital markets, securitization, and project finance); Real estate transactions.

He also handles recent innovations such as IoT, FinTech, IT and bigdata.  He acts for the FinTech Association Japan as its secretariat, and for the Council on Competitiveness-Nippon (COCN) that looks to improve coordinated behaviour between autonomous artificial intelligence systems as a project member.


Mitsui Company (formerly Mitsui Yasuda Wani & Maeda) (2003-2006); Nagashima Ohno & Tsunematsu (2006-2012); Pillsbury Winthrop Shaw Pittman LLP (New York) (secondment, 2010-2011).


Japanese and English


Admitted in Japan and New York.
Daini Tokyo Bar Association


Waseda University (LL.B., 2002); The Legal Training and Research Institute of the Supreme Court of Japan (2003); Columbia Law School (LL.M., 2010).

Japan: Capital markets

Capital markets ‚Äď Independent local firms

Within: Capital markets ‚Äď Independent local firms

Atsumi & Sakai's capital markets team welcomed Akimoto Kawamura who joins as a partner from Citigroup. In recent highlights, a major bank appointed financial law expert Takumi Fukuda to represent it as trustee in a guarantee of debt transaction using an ABL structure, and Hiroyuki Sanbe handled the regulatory aspects of the registration of foreign traders as High Frequency Traders. In other matters of note, Teruhisa Toyama advised a technology company in a minority squeeze-out through a reverse stock split as part of its restructuring, and Ryuichi Nozaki teamed up with the firm's London office to counsel a major international bank as facility agent, intercreditor agent and security trustee on high-value debt and hedging facilities to a UK PFI/PPP portfolio project in connection with a Japanese bank's accession to the funds. Another key name to note is that of managing partner Hiroo Atsumi.

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Japan: Corporate and M&A

Corporate and M&A ‚Äď Independent local firms

Within: Corporate and M&A ‚Äď Independent local firms

Atsumi & Sakai has welcomed Go Fujimoto, Go Hashimoto and Hisashi Miyatsuka from 'Big Four' firm Nishimura & Asahi, as well as Akimoto Kawamura from Citigroup, further strengthening the practice. Global Infrastructure Partners engaged a team led by Hiroyuki Sanbe as Japanese counsel on its acquisition of a 100% equity interest in the wind and solar portfolios of Equis Funds. Meanwhile, dispute resolution partner Bonnie Dixon handled Advanced Energy Industries' takeover of Japanese manufacturer Trek Holdings. Also notable is Ashish Jejurkar's work for PayMate and its promoter pertaining to the regulatory aspects of the investment by Mayfair101. Miho Niunoya assisted a Japanese power company with its purchase of shares in a foreign project company established to develop a geothermal power plant in South East Asia. Further key contacts include senior partner Shintaro Hamasu and Masayuki Matsuura .

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Japan: Projects and energy

Projects and energy ‚Äď Independent local firms

Within: Projects and energy ‚Äď Independent local firms

At¬†Atsumi & Sakai,¬†Miho Niunoya¬†and¬†Yuko Nihonmatsu¬†advised the Japan Research Institute and Maebashi City on a PPP project to design, build and operate a roadside station, entertainment and sightseeing facility in Maebashi City. Corporate expert¬†Hiroyuki Sanbe¬†recently acted for the Global Infrastructure Partners in the Japanese law aspects of its takeover of Equis Fund's wind and solar energy portfolio, and¬†Ryosuke Oue¬†aided in the acquisition of shares in large-scale power projects of an electricity company. Other key names include nuclear specialist¬†Simon Bezzina¬†‚Ästwho advised on the English law aspects of the procurement of nuclear power facilities ‚ÄstMichiaki Hosoi,¬†Junko Ogushi¬†and¬†Yutaka Sakai.¬†Hiroshi Maeda has joined from¬†Nishimura & Asahi.

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Japan: TMT

TMT ‚Äď Independent local firms

Within: TMT ‚Äď Independent local firms

The ‚Äėprompt and responsive‚Äô Atsumi & Sakai¬†fields¬†experienced¬†domestic and international¬†lawyers, and¬†includes¬†an¬†innovation¬†practice¬†group¬†which focuses on the key emergent areas of¬†fintech, Internet of Things (IoT) and¬†artificial intelligence¬†(AI).¬†Yuri Suzuki, who heads the fintech team, is¬†assisting Mitsubishi UFJ Financial Group with the business plans, prototypes, alliances and roll out process¬†for the company‚Äôs Digital Accelerator Program, while the IoT and AI team is jointly led by Masataka Hayakawa, Hiroyuki Sanbe¬†and Takafumi Ochiai.¬†The ‚Äėapproachable, supportive and knowledgeable‚Äô Chie Kasahara¬†leads the TMT department, which also¬†handles¬†the¬†registration, protection, use and licensing of patents, model utility rights, design rights, copyrights and trade marks.

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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 (‚Äúthe Minister‚ÄĚ), has published the Criminal Justice Bill 2011 (‚Äúthe Bill‚ÄĚ). The main purpose of the Bill is stated to be ‚Äú‚Ķto 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.‚ÄĚ
  • 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).