Department profile
Nagashima Ohno & Tsunematsu

Competition/Antitrust

Asia-Pacific Guide 2026 : Japan

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Nagashima Ohno & Tsunematsu

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About

Provided by Nagashima Ohno & Tsunematsu

Antitrust/competition law practice requires in-depth insight and commercial practicability backed by highly specialized knowledge and expertise in communicating with competition authorities. With our unparalleled bench strength of lawyers and an advisor who has served as top-level officer of Japan Fair Trade Commission, we have earned an excellent reputation with our clients as well as a trusted professional network of foreign antitrust/competition lawyers.

For more details, please visit our website:

https://www.nagashima.com/en/practices/antitrust_and_competition/

Chambers Review

Provided by Chambers

Competition/Antitrust - Japan

Band 1

What the Team is Known For

Nagashima Ohno & Tsunematsu is a go-to group for domestic and international corporates looking to secure JFTC clearances on cross-border M&A transactions, including Phase I and II reviews. The firm also possesses noteworthy expertise in cartel investigations and assists companies with investigations into unfair trade practices. The team regularly works in conjunction with international co-counsel to provide Japanese law advice on multi-jurisdictional mandates.

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Work Highlights

Provided by Chambers

  • Nagashima Ohno & Tsunematsu represented Novo Holdings and Novo Nordisk in connection with their merger control filings to the JFTC regarding their acquisition of Catalent.

Strengths

Provided by Chambers

  • NO&T's strength lies in its ability to accurately grasp the needs of clients and provides them with outputs and tactics that align with their objectives and intentions.

    Competition/Antitrust respondentAsia-Pacific

  • They have a high level of expertise and ability to respond as a team when a large number of people are required.

    Competition/Antitrust respondentAsia-Pacific

Notable Practitioners

Provided by Chambers

  • Kaoru Hattori
    Kaoru Hattori

    Kaoru Hattori

    Kaoru Hattori is much exalted for her experience and expertise across the full spectrum of advisory and contentious antitrust law matters.

    • Ms Hattori has rich practical experience and is active in the front line of the business and can handle the difficult problems in projects well.

      Competition/Antitrust respondentAsia-Pacific

    • In addition to her high level of expertise, we regard her highly for her persuasive communication and flexible response.

      Competition/Antitrust respondentAsia-Pacific

    • Kaoru Hattori is a top competition practitioner in Japan. She brings impeccable preparation combined with deep understanding of competition framework in several jurisdictions.

      Competition/Antitrust respondentAsia-Pacific
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  • Yoshitoshi Imoto
    Yoshitoshi Imoto

    Yoshitoshi Imoto

    Yoshitoshi Imoto has a stellar reputation in the market, garnering endorsements from clients for his expertise in cross-border merger filings and investigations.

    • His legal advice is rigorous and comprehensive, and he is able to provide highly targeted compliance advice to companies based on the characteristics of the industry.

      Competition/Antitrust respondentAsia-Pacific

    • Yoshitoshi is knowledgeable about international cartel investigations.

      Competition/Antitrust respondentAsia-Pacific
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  • Ryohei Tanaka
    Ryohei Tanaka

    Ryohei Tanaka

    Ryohei Tanaka frequently advises on a wide range of competition law-related matters including merger control proceedings.
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  • Yusuke Kaeriyama
    Yusuke Kaeriyama

    Yusuke Kaeriyama

    Yusuke Kaeriyama draws on expertise gained through his experience working at the investigation bureau of the JFTC. He has an active practice encompassing both merger control work and antitrust investigations.

    • Yusuke provides meticulous analysis based on his accurate knowledge of competition law and his experience. Based on his secondment experience to the JFTC, he provides practical advice.

      Competition/Antitrust respondentAsia-Pacific

    • Mr Kaeriyama is a commercially sensitive competition law expert with a solid legal background and can come up with innovative compliance solutions from both commercial and regulatory perspectives.

      Competition/Antitrust respondentAsia-Pacific
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  • Satoshi Ogawa
    Satoshi Ogawa

    Satoshi Ogawa

    Satoshi Ogawa is recognised for his adept handling of multijurisdictional merger filings, especially for a highly concentrated industry such as maritime transportation.

    • He has an in-depth knowledge of competition law and provides commercial advice based on an understanding of business.

      Competition/Antitrust respondentAsia-Pacific

    • Satoshi is very attentive to detail and client needs.

      Competition/Antitrust respondentAsia-Pacific

    • Satoshi Ogawa has demonstrated excellent expertise in antitrust law, particularly in the merger filings for complex transactions.

      Competition/Antitrust respondentAsia-Pacific
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Ranked Individuals at Nagashima Ohno & Tsunematsu (5)

Japan

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