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Press Release: Tomoki Mizuno Steps Down from UPSIDER Holdings

UPSIDER Holdings, led by President Toru Miyagi and based in Minato-ku, Tokyo, has announced a significant leadership change. Tomoki Mizuno, the Vice President and co-founder, will complete his term at the conclusion of the regular shareholders meeting scheduled for July 2026. Following his departure, Mizuno plans to retain his shares in the company, continuing to support its growth as a stakeholder.

Transition of Leadership

Mizuno has been a pivotal figure since co-founding UPSIDER in 2018 alongside President Miyagi. Together, they have launched vital services such as the corporate card "UPSIDER" and the invoice payment service "Shiharai.com," which have been instrumental in building the company's strong organizational foundation.

After eight years at the helm, the current leadership is well-prepared for a transition towards the next generation of leaders that Mizuno has helped to nurture. This move is a planned and healthy transition in response to the strategic needs of the company and does not stem from compliance issues or conflicts with shareholders.

Mizuno's legacy will be adopted by the existing management team, led by Miyagi, and all employees as they strive to fulfill their mission of creating a global financial platform for challengers.

Mizuno's Reflections

Expressing gratitude, Mizuno stated, "I sincerely thank all our customers and partners who have supported UPSIDER over the past eight years. With a solid foundation established, and promising leaders prepared to take the reins, I believe this is the right time to step back from my directorship. UPSIDER is entering a phase of significant challenges, and as a shareholder, I will continue to believe in and support these efforts."

Miyagi's Acknowledgment

President Miyagi praised Mizuno's contributions, remarking, "As a co-founder, he has played a crucial role in both launching our business and building our organization. The last eight years together have shaped my leadership values and the fundamental principles guiding UPSIDER's decision-making. I am truly grateful for his partnership and leadership."

About UPSIDER Holdings

UPSIDER Holdings operates with the mission of creating a global financial platform to empower challengers. By employing AI and technology, the company offers essential financial and operational infrastructure to medium-sized and startup enterprises, helping them overcome common challenges related to cash flow and administrative burdens.

Some of UPSIDER's prominent services include:

• - AI-driven corporate card "UPSIDER" (with a cumulative transaction value of over 850 billion JPY by the end of November 2025)
• - Invoice payment service "Shiharai.com" (with a cumulative transaction value exceeding 150 billion JPY by the end of November 2025)
• - Corporate card designed for executives called "PRESIDENT CARD"
• - The "UPSIDER BLUE DREAM Fund," a growth debt fund for startups, granting over 15 billion JPY in loans by the end of February 2026
• - Online loan service "UPSIDER キャッシュブースト" for growing companies

As of November 2025, UPSIDER's services have attracted over 100,000 users, with the cumulative credit limit for its corporate card exceeding 5 trillion JPY.

By making financial functionalities accessible to all, UPSIDER aims to evolve into a financial platform grounded in trust, contributing to a society that supports audacious businesses.

Contact Information

For inquiries about implementing services, press coverage, or partnerships, please reach out at [email protected]. Information in this release reflects the status as of the date of publication.