Booost raises 700 million yen in Series C 1st closing; One Capital and Pronexus invest, bringing total funding since Series A to 4.15 billion yen

Booost Inc. (Shinagawa-ku, Tokyo; CEO: Hironori Aoi; hereinafter referred to as "the Company"), which supports companies' SX (Sustainability Transformation)*3 through the provision of "Sustainability ERP*1," the No. 1 share in large enterprises*, and the advocacy of the "Sustainability 2026 Problem*2," is scheduled to complete a total funding of 700 million yen as of March 31, 2026, in its Series C round 1st closing, through a third-party allotment of new shares to One Capital Inc. (Minato-ku, Tokyo; CEO: Shinji Asada; hereinafter referred to as "One Capital") and Pronexus Inc. (Minato-ku, Tokyo; President: Takeshi Ueno; hereinafter referred to as "Pronexus"). With this funding, the cumulative amount raised since Series A is expected to reach 4.15 billion yen. This round is not merely about fundraising but also signifies a deepening of strategic collaboration with Pronexus, which has a top-class track record in Japan in the disclosure field, and represents a significant step towards building new infrastructure for integrated disclosure of financial and non-financial information. Furthermore, by developing a disclosure operations platform centered on AI, we will fundamentally evolve the traditional disclosure process.

■ Series C Round (1st Closing) Funding

In this round, following Series B, One Capital will serve as the lead investor, and we will raise 700 million yen with Pronexus as the subscriber. We entered into a basic agreement for a strategic business alliance with Pronexus in September 2025, and this investment will further strengthen our collaboration and initiate the following initiatives:

• Joint development of an integrated disclosure (financial + non-financial) system compliant with Sustainability Disclosure Standards (SSBJ standards)

• Market expansion utilizing the customer bases of both companies

• Disclosure support services integrating the expertise of both companies and generative AI

Through these efforts, we aim to evolve corporate disclosure operations from mere compliance to a management process that contributes to enhancing corporate value.
Reference: Press Release: "Booost and Pronexus Reach Basic Agreement on Strategic Business Alliance"

With the SSBJ standards applicable from the fiscal year ending March 2027, listed companies on the Prime Market will be required to provide integrated disclosure of financial and non-financial information. While the system is progressing, companies are facing the following challenges:

• Increased burden of disclosure operations

• Connection between financial and non-financial data

• Enhanced ability to explain to investors

Our company has addressed these challenges through our Sustainability ERP "booost Sustainability," building a foundation for integrating non-financial data in a way that can be utilized for management decisions. Adoption is progressing, primarily among Prime Market listed companies with a market capitalization of 500 billion yen or more, which are subject to SSBJ standards.

Through the collaboration with Pronexus, we will achieve advanced and efficient disclosure that meets the standards required by investors, and a new...