Company Information

Company Name: UPSIDER Holdings, Inc.
Founded: May 2024
UPSIDER, Inc. was founded in May 2018; transitioned to a holding company structure in 2024.
CEO: Toru Miyagi, Co-founder and CEO
Capital: 14,293 million JPY
Including capital reserve, etc. (Group consolidated)
Major Shareholder: Toru Miyagi, Tomonori Mizuno
Mizuho Bank, Ltd.
Business: UPSIDER: Business card driven by AI
Shiharai.com: Credit card payment service for invoices
UPSIDER BLUE DREAM Fund: Growth debt fund
PRESIDENT CARD: Premium card empowering entrepreneurs
UPSIDER Cash Boost: Online lending service for growth companies
Breakthrough GRID: Community for business leaders
Corporate card infrastructure licensing (AI credit scoring / payment infrastructure)
Headquarters: 7-15-7 Roppongi, Minato-ku, Tokyo
Certifications: Japan Payment Service Association
JIIMA certifications: “Certification of Scanner Preservation Software for Statutory Requirements under the Electronic Book Preservation Act” and “Certification of Electronic Commerce Software for Statutory Requirements”
Information Security Management System (ISMS) certification, registration no. IS 799150
Website: https://corp.up-sider.com/

Executive Team

Toru Miyagi

President & CEO, UPSIDER Holdings

宮城徹

After graduating from the University of Tokyo, joined McKinsey & Company as a new graduate in 2014. At the Tokyo and London offices, he worked on company-wide transformation projects for major financial institutions, including digital strategy such as bank open APIs and the optimization of fee structures and branch networks. Drawing on his awareness of the challenges in this field and his knowledge and experience, he co-founded UPSIDER, Inc. with Mizuno in 2018.

Tomonori Mizuno

Director & Vice President, UPSIDER Holdings

水野智規

Began his career at ABeam Consulting as an engineer designing and developing infrastructure for financial institutions. He then joined Uzabase, where he took part in launching NewsPicks before serving as head of marketing for the entire group. Based on the awareness and firsthand experiences he had at the time of founding, he co-founded UPSIDER, Inc. with CEO Miyagi in 2018.

Naoki Ishigami

Representative Director, UPSIDER Capital

石神直樹

Joined KPMG AZSA LLC in 2014. Centered on the IT industry, he served as lead auditor for several listed clients while also engaging in IPO support and FAS work such as financial due diligence. He joined UPSIDER, Inc. in 2019. In 2023 he launched the growth debt fund “UPSIDER BLUE DREAM Fund,” and currently serves as Representative Director of UPSIDER Capital, Inc. He is also an Executive Officer of UPSIDER, Inc.

Kensuke Tsujimoto

CLO, UPSIDER Holdings

逵本憲祐

Began his career at Nagashima Ohno & Tsunematsu, handling financial litigation, labor, and Companies Act–related matters. In 2019 he took part in establishing and operating a hedge fund in Singapore, and after launching an apparel brand startup, he joined UPSIDER, Inc. in 2023. He currently oversees legal and labor affairs as CLO.

Yosuke Komeda

VP of Growth, UPSIDER

米田陽介

Joined Rakuten, Inc. in 2007. He served as an Executive Officer of the company from 2019, an Executive Officer of Rakuten Mobile, Inc. in November of that year, and Vice President of Rakuten Baseball, Inc. from October 2021, then President & CEO of the same company from January 2022, before joining UPSIDER, Inc. in 2024.

Yusuke Izumi

VPoE, UPSIDER

泉雄介

After graduating from a music college in the United States and working as a composer at a media production company, he founded a company in system development. He has held roles including bond-trading system development at Morgan Stanley, lead engineer for the game platform business and healthcare service development at DeNA, and Director and CTO of Raksul. He holds the CFA (Chartered Financial Analyst) designation and has deep expertise in both finance and technology. He currently leads the engineering organization as VPoE of UPSIDER, Inc.

Daisuke Mori

VPoP, UPSIDER

森大祐

Led the development of enterprise business systems at Works Applications. He then launched multiple AI SaaS products at the PKSHA Group, driving their growth as Executive Officer of Product Planning. He joined UPSIDER, Inc. in 2023. As VP of Product, under the vision of “re-engineering the world surrounding challengers with AI,” he oversees, as business owner, the development of a product suite that redesigns the space between finance and operations.

Takashi Maki

VP, UPSIDER Capital

眞木貴司

After serving at Mizuho Financial Group in roles including branch manager, large-corporate sales, corporate planning, chief auditor, and investment banking, he joined from the preparatory phase of establishing LINE Bank. After serving as Executive Officer for Corporate Planning at LINE Financial, he joined UPSIDER, Inc. in 2023. He is a Chartered Member of the Securities Analysts Association of Japan (CMA) and a Certified Internal Auditor (CIA).