Awards
Mr. Masato Kumeuchi is a partner at Nagashima Ohno & Tsunematsu. He acquired his qualification as a lawyer in Japan and joined Nagashima Ohno & Tsunematsu in 2010. He moved to California in 2016 and obtained a Master of Laws degree at the University of California, Los Angeles (UCLA) School of Law. From 2017 to 2018, Mr. Kumeuchi was seconded to Kirkland & Ellis LLP in Chicago, and to date, he regularly provides advice spanning a wide range of areas, including real estate law / J-REITs, pharmaceutical law, and intellectual property law.
With respect to J-REIT, he has been involved in real estate transactions, real estate finance, incorporation, public offerings, and M&As. He has also advised domestic and foreign real estate private equity funds on a wide range of matters.
Moreover, Mr. Kumeuchi is familiar with pharmaceutical and healthcare related matters. He has been providing practical advice to both domestic and foreign pharmaceutical and medical device companies. He is currently serving as an external committee member of a pharmaceutical company.
Practice Areas
Education/Professional Experience
- 2005
- The University of Tokyo (LL.B.)
- 2005
- Nippon Life Insurance Company
- 2009
- Osaka University Law School (J.D.)
- 2010 -
- Nagashima Ohno & Tsunematsu
- 2017
- University of California, Los Angeles, School of Law (LL.M.)
- 2017 - 2018
- Kirkland & Ellis LLP, Chicago
- 2023 - present
- Partner, Nagashima Ohno & Tsunematsu
Awards
Seminars
-
September 24, 2025 (Wed) -Amendment of the Act on Building Unit Ownership and its Impact on Practice
- Masato Kumeuchi
- Ryunosuke Yamane
- Kodai Ebihara
Online (On-Demand)
- Real Estate and REITs
- Real Estate Transactions
-
May 29, 2025 (Thu) 14:00 - 16:30Navigating the Latest Trends in Real Estate Law: Insights on Data Centers and Hotels
- Mami Ikebukuro
- Kenji Utsumi
- Makoto Saito
Nagashima Ohno & Tsunematsu Tokyo Office
- Real Estate and REITs
- Real Estate Investment/Real Estate Securitization
-
December 1, 2023 (Fri) -Latest Developments on the Regulations on Personal Data Protection and Intellectual Property Law in Relation to HealthTech
- Masato Kumeuchi
- Masanori Tosu
Online (On-Demand)
- Pharmaceutical and Healthcare
- Medical, Pharmaceutical and Life Sciences
-
September 26, 2023 (Tue) 15:00 - 17:10New Developments in Intellectual Property Law – 2023 Amendments and Recent Key Issues (NO&T IP Forum 2023)
- Takahiro Yamauchi
- Kenji Tosaki
- Shunji Matsuda
Nagashima Ohno& Tsunematsu (Tokyo)
- Intellectual Property
- IP Transactions
Publications
-
Articles
The Legal 500: 3rd Edition Life Sciences Country Comparative Guide – Japan
(March 2026)
Yoshinobu Koyama, Masato Kumeuchi, Masanori Tosu (Co-author)
- Pharmaceutical and Healthcare
- Medical, Pharmaceutical and Life Sciences
-
Articles
Lexology Panoramic – Real Estate 2026 Japan
(December 2025)
Shinichiro Horaguchi, Yoshinobu Koyama, Yoshihisa Watanabe, Masato Kumeuchi (Co-author)
- Real Estate and REITs
- Real Estate Transactions
-
Newsletters
Amendment of the Act on Building Unit Ownership and Its Impact on Practice
Masato Kumeuchi, Kodai Ebihara (Co-author)
- Real Estate and REITs
- Real Estate Transactions
-
Newsletters
Judgment rendered by the Grand Panel of the Intellectual Property High Court on March 19, 2025, regarding the patentability of compositions which contemplate medical procedures both before and after manufacture
Kenji Tosaki, Masato Kumeuchi, Soichiro Unami (Co-author)
- Dispute Resolution
- IP Disputes
- Intellectual Property