Of Counsel

Tokyo + 81.3.6744.1614

Masayuki Horiike has more than 10 years of experience advising multinational companies and investment funds in a range of transactions, including domestic and cross-border M&A, private equity investments, and joint ventures. He has significant experience representing international investment funds and companies on their investments, and associated financing, in a wide range of industries in Japan, including manufacturing, technology, renewable energy, and real estate.

Masayuki's experience also includes working in Jones Day's Silicon Valley Office where he advised American and European clients on U.S. M&A transactions, including acquisitions of and investments in tech start-ups. Masayuki continues to utilize his U.S. experience in advising Japanese companies on outbound M&A and investments.

In addition, Masayuki advises clients on general corporate, employment, and international cartel investigations matters as well and has experience conducting cross-border internal investigations.

During a two-year secondment to the legal department of a major international medical device company, Masayuki provided advice on the establishment of business-to-consumer (B2C) e-commerce and on medical industry regulations related to laws pertaining to pharmaceutical and medical devices, medical practitioners, Fair Competition Code, and personal information protection.


  • PTTGC acquires allnex from AdventJones Day is advising PTT Global Chemical Public Company Limited in the €4 billion acquisition of allnex Holding GmbH from Advent International.
  • STERIS acquires Cantel Medical for $3.6 billionJones Day advised STERIS plc in its acquisition of Cantel Medical Corp, a global provider of infection prevention products and services primarily to endoscopy and dental customers, for $3.6 billion.
  • Japanese consortium led by Suntory partners with Anellotech to develop plastics recycling technologyJones Day advised a consortium jointly established by Suntory and other Japanese companies in connection with its partnering with Anellotech, Inc., a U.S.-based biochemical company, in the development of a plastics recycling technology.
  • ITOCHU Techno-Solutions forms joint venture with QuestTekJones Day advised ITOCHU Techno-Solutions Corporation ("CTC") in its formation of a joint venture company in Japan with QuesTek Innovations LLC ("QuesTek"), a leading company in innovative materials design and development. CTC and QuesTek will jointly establish QuesTek Japan K.K. and will provide ICME modeling service, as well as developing and designing novel materials, optimizing materials processes, and licensing of novel materials.
  • Sumitomo Dainippon Pharma acquires late stage biopharma companies and forms alliance with Roivant Sciences Ltd. worth $3 billionJones Day advised Sumitomo Dainippon Pharma Co., Ltd. ("Sumitomo") in an acquisition of late stage biopharma companies and formation of alliance with Roivant Sciences Ltd.
  • Western Digital sells IntelliFlash™ business to DataDirect Networks, Inc. (DDN®)Jones Day advised Western Digital Corp. in the sale of its IntelliFlash™ business to DataDirect Networks, Inc. (DDN®), a global leader in artificial intelligence (AI) and multi-cloud data management.
  • Amp acquires mega solar power plant in Fukushima PrefectureJones Day advised Amp Co., Ltd. on the acquisition, EPC contract, and financing of mega solar power plant in Fukushima Prefecture.
  • Marken acquires PCX International Co., Ltd.Jones Day advised United Parcel Service in the acquisition by its Marken division of PCX International Co., Ltd., a logistics and courier service company specializing in transport of clinical samples in Japan.
  • ANSYS acquires Granta Design LimitedJones Day advised ANSYS, Inc., the global leader and innovator of engineering simulation software, in their acquisition of Granta Design, the premier provider of materials information technology, and Granta Design Limited has become a wholly-owned subsidiary of ANSYS.
  • UPL acquires Arysta LifeScience from Platform Specialty Products Corporation for $4.2 billionJones Day advised UPL Limited ("UPL"), a leading global generic agrochemical company based in India, in connection with its subsidiary, UPL Corporation Limited’s, US$4.2 billion acquisition and related $3 billion term financing of Arysta Lifescience Inc. (“Arysta”), a global provider of crop protection solutions, including bio-solutions and seed treatment, from NYSE listed Platform Specialty Products Corporation (“Platform”).
  • Morpho acquires majority stake in Top Data Science Ltd.Jones Day advised Morpho, Inc., a global leader in software image processing solutions for mobile devices, in its majority stake acquisition of Top Data Science Ltd., a Finnish data science company focusing on AI powered computer vision and deep learning solutions and development services.
  • Cabot acquires NSCC Carbon (Jiangsu) Co., Ltd. carbon black plant in ChinaJones Day advised Cabot Corporation in its acquisition of NSCC Carbon (Jiangsu) Co., Ltd. from Nippon Steel Carbon Co., Ltd., a subsidiary of Nippon Steel Chemical & Material Co., Ltd.
  • Arsenal Capital Partners sells IGM Resins to AstorgJones Day advised Arsenal Capital Partners (“ACP”) on the full shop auction of IGM Resins Cooperative U.A. and its group (“IGM”) to European private equity firm Astorg as the successful bidder.
  • AGIC Capital acquires Fotona from The Gores GroupJones Day advised Asia-Germany Industrial Promotion Limited ("AGIC Capital"), an Asian-European private equity investor focused on industrial technology companies in the European and North American mid-market, in connection with the acquisition and related financing of Fotona, a U.S. and Slovenia based developer of high-tech laser systems and components, primarily used in medicine, aesthetics, surgery, gynecology, and dentistry, from private equity firm, The Gores Group.
  • GE Digital acquires IQP CorporationJones Day advised GE Digital in its acquisition of IQP Corporation, a start-up operating in Israel, Japan, and the U.S. that provides a no-code or low-code IoT app builder, with a visual interface available on mobile, tablet, and PC, includes data apps, and is installable on public cloud, private cloud, and on premise.
  • Newell Brands sells Winter Sports businesses to Kohlberg & Company for $240 millionJones Day advised Newell Brands Inc. (NYSE: NWL) in the sale of its Winter Sports businesses to private equity firm Kohlberg & Company for $240 million, subject to adjustment.
  • Orange invests in DanalJones Day represented Orange, S.A. in connection with its investment in Danal, Inc., a provider of mobile digital identity solutions.
  • Riverside acquires Comprehensive Loss ManagementJones Day represented The Riverside Company in connection with the add-on acquisition and related financing to the Health & Safety Institute platform of Comprehensive Loss Management, Inc., a provider of safety and compliance-related courses to a diverse customer base.
  • Itron acquires Comverge for approximately $100 millionJones Day advised Itron, Inc. (NASDAQ: ITRI) in its approximately $100 million cash acquisition of Comverge, Inc. by way of the purchase of its parent company, Peak Holding Corp.
  • Intersil acquired by Renesas Electronics for $3.2 billionJones Day advised Intersil Corporation, a provider of power management and precision analog solutions, in its $3.2 billion acquisition by Renesas Electronics Corporation, a supplier of advanced semiconductor solutions.