Awards
Ryohei Tanaka
Partner
Tokyo Office
- Languages
- Japanese, English
- Qualifications
- 2007(-2011), 2014-, Japan (Dai-Ichi Tokyo Bar Association
2012-2013, Japan (Osaka Bar Association)
Ryohei Tanaka is a partner at Nagashima Ohno & Tsunematsu. He mainly advises on competition law related matters including merger control, cartel investigations and leniency applications, as well as general corporate, cross-border transactions and other compliance matters.
He is a graduate of the University of Tokyo (LL.B., 2004), University of Tokyo School of Law (J.D. 2006) and Stanford Law School (LL.M., 2014). He was admitted to the Japan Bar in 2007. He has worked for the Legal Head Quarters of Sanyo Electric (2012-2013) and as a foreign attorney at Arnold and Porter Kaye Scholer LLP (Brussels) (2013-2014). He is fluent in Japanese and English.
Practice Areas
Education/Professional Experience
- 2004
- The University of Tokyo (LL.B.)
- 2006
- The University of Tokyo School of Law (J.D.)
- 2007 -
- Nagashima Ohno & Tsunematsu
- 2012 - 2013
- SANYO Electric Co., Ltd.
- 2014
- Stanford Law School (LL.M., Corporate Governance & Practice)
- 2014 - 2015
- Arnold & Porter LLP, Brussels
- 2018 - present
- Partner, Nagashima Ohno & Tsunematsu
Awards
Seminars
-
September 4, 2025 (Thu) 15:00 - 17:00Global Competition Law Update: Key Insights and Critical Points from US, EU, and Japanese Lawyers
- Kaoru Hattori
- Yoshitoshi Imoto
- Ryohei Tanaka
Nagashima Ohno & Tsunematsu Tokyo Office
- Antitrust and Competition
- Antitrust and Competition Law Advice
-
August 23, 2024 (Fri) 14:00 - 16:40The Forefront of Life Sciences Legal Practice in an Era of Change – Part 1: Compliance and Risk Management Part 2: M&A and Strategic Partnerships
- Kensuke Suzuki
- Ryohei Tanaka
- Kenji Horiuchi
Nagashima Ohno & Tsunematsu Tokyo Office
- Pharmaceutical and Healthcare
- Medical, Pharmaceutical and Life Sciences
-
December 7, 2023 (Thu) - December 6, 2024 (Fri) 16:00Latest Developments in Competition Law: Special Edition “Navigating Fact-finding Surveys”
- Kaoru Hattori
Online (On-Demand)
- Antitrust and Competition
- Other Antitrust Law Investigations
-
October 19, 2023 (Thu) 15:00 - 17:10Latest Developments in Competition Law
- Kaoru Hattori
- Yoshitoshi Imoto
- Ryohei Tanaka
Nagashima Ohno& Tsunematsu (Tokyo)
- M&A
- Mergers & Acquisitions
- Antitrust and Competition
Publications
-
Articles
Lexology Panoramic – Cartel Regulation 2025 Japan
(January 2025)
Kaoru Hattori, Yoshitoshi Imoto, Ryohei Tanaka (Co-author)
- Antitrust and Competition
-
Articles
The International Comparative Legal Guide to: Merger Control 2025 – Chapter 17 Japan
(December 2024)
Ryohei Tanaka, Tsuyoshi Isshiki, Nobuaki Ito, Haruki Koyama (Co-author)
- Antitrust and Competition
- Merger Control
-
Articles
The International Comparative Legal Guide to: Merger Control 2024 – Chapter 16 Japan
(December 2023)
Ryohei Tanaka, Nobuaki Ito, Keiichiro Ikawa (Co-author)
- Antitrust and Competition
- Merger Control
-
Articles
Lexology Getting the Deal Through – Cartel Regulation 2024 Japan
(November 2023)
Kaoru Hattori, Yoshitoshi Imoto, Ryohei Tanaka (Co-author)
- Antitrust and Competition