M&A Support Organization Publishes Case Study: M&A between Hoover Brain and ProofX

Plex Inc. (Headquarters: Chuo-ku, Tokyo; President and Representative Director: Shun Kurozaki) has published a case study of a successful M&A transaction facilitated by its M&A Support Organization between Hoover Brain Inc. (Headquarters: Chiyoda-ku, Tokyo; President and Representative Director: Hideyuki Koshimizu; hereinafter "Hoover Brain") and ProofX Inc. (Headquarters: Shibuya-ku, Tokyo; Representative Director and CEO: Ryota Natsume; hereinafter "ProofX").

(Top photo: Hideyuki Koshimizu, President and Representative Director of Hoover Brain; Bottom photo: Ryota Natsume, Representative Director and CEO of ProofX)

[Interview Video] Hideyuki Koshimizu, President and Representative Director of Hoover Brain × Ryota Natsume, Representative Director and CEO of ProofX

　▶ https://youtu.be/R8hTipnk-yE

　
[Interview Article] Strategic M&A to Redefine Business and Drive Expansion in the AI Era

　▶ https://mashien.com/interview/10

M&A Support Organization Mediates M&A between Hoover Brain and ProofX

The M&A Support Organization mediated the M&A between Hoover Brain Inc. and ProofX Inc., which was completed in March 2026.

Hoover Brain is a company that supports corporate information security measures, including its proprietary endpoint software and the provision of network appliances.

Looking ahead to the "AI Agent Era," where AI autonomously judges and acts, the company aims to evolve into a "Japan-originated AI Guardian" that protects the trust and safety of AI. Recognizing that hiring and developing highly specialized personnel in the generative AI field requires significant time, the company proceeded with considerations for an integrated acquisition of business, technology, and human resources through M&A, ultimately acquiring ProofX Inc., which provides business reform and DX consulting, business creation support, and AI system development utilizing generative AI technology.

On the other hand, ProofX Inc. is a startup founded in May 2022 by Mr. Natsume, who gained experience as an AI research and development engineer. The company operates a business reform consulting and contract development business leveraging its high expertise in generative AI technology. To further expand its business and customer base, it deemed collaboration with a major partner possessing strong sales and capital capabilities essential and decided on a strategic M&A with the optimal partner.

Through the publication of this successful case study, we hope to deepen understanding of M&A, including the backgrounds and challenges that led selling company executives to choose M&A and how acquiring company executives have realized business succession and growth strategies, encouraging consideration of M&A as an option for a better future.

M&A is a significant decision for both selling and acquiring companies. The M&A Support Organization will continue to act as a bridge between companies, providing transparent M&A mediation through careful processes and optimal matching that leads to the growth of both parties.

About the M&A Support Organization

The M&A Support Organization is a fully success-fee-based M&A brokerage firm operated by Plex Inc. Since its establishment, it has handled M&A and business succession across a wide range of industries, not limited to infrastructure sectors such as logistics, construction, and manufacturing.

It employs experienced advisors who provide specialized support tailored to the characteristics of each industry, respecting the policies of business owners and specializing in matching them with optimal partners that offer high synergy effects. This enables flexible and effective M&A support tailored to client needs.

M&A Support Organization Service Site: https://mashien.com/

About Plex Inc.

With the mission of "Creating systems that move Japan," the company leverages technology and human power to provide "valuable systems" to everyone involved in the infrastructure industry.

Its founding business began with driver-focused recruitment agency services, leading to the launch of Plex Job. Since then, it has expanded into various fields beyond logistics, including construction and manufacturing. In addition to its recruitment support and agency business, it is also developing new business models such as SaaS and M&A brokerage.

Plex Inc. Corporate Site: https://plex.co.jp/

Company Name: Plex Inc.
Representative Director: Shun Kurozaki
Date of Establishment: April 9, 2018
Capital: 5,000,000 yen
Location: 6F, Kyodo Building (in front of Bank of Japan), 3-2-4 Nihonbashi Honcho, Chuo-ku, Tokyo
Business Description: HR Tech business in logistics, construction, and manufacturing (Ministry of Health, Labour and Welfare License No.: Paid Employment Placement Business 13-Yu-309652), DX promotion business in the construction industry, M&A brokerage business

■ Inquiries regarding the M&A Support Organization
Contact: M&A Support Organization Corporate Desk
Phone: 03-6682-1382 (Weekdays 9:00 AM to 6:00 PM)
Inquiry Form: https://mashien.com/contact

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■ Inquiries regarding this press release
Contact: Shimada, Public Relations, Plex Inc.
Phone: 080-4385-4541 (Weekdays 9:00 AM to 6:00 PM)
Email: pr@plex.co.jp

*Unauthorized reproduction of text, photographs, etc., posted on the M&A Support Organization's website is strictly prohibited. If you wish to do so, please contact the above public relations representative.