Working towards further growth
and greater value for our customers

THREE SIDE Co.,Ltd (head office: Itabashi-ku, Tokyo; Representative Director: Keisuke Aiki; hereinafter “the Company”) announces that it will become a group company of 10X Co., Ltd. (head office: Minato-ku, Tokyo; Representative Director: Ryohei Tanaka), effective 1 October 2026.

By joining the group, we will further develop the technical expertise we have built in IT infrastructure implementation and installation, establish a structure capable of handling more advanced and larger projects, and deliver greater value to our customers.

1. Purpose of Joining the Group
Developing our expertise.
Taking on greater challenges.

Since our establishment, we have built trusted relationships with our customers by approaching every site with sincerity and consistently applying sound technical expertise and working with integrity through IT infrastructure implementation and installation.

In recent years, the rapid adoption of AI and growing investment in data centres have raised the standards expected of IT infrastructure quality, technical expertise and installation capabilities.

In this market environment, we decided to join 10X to acquire more advanced skills, take on larger and more sophisticated projects, and provide greater value to our customers.

10X has strong technical and project management capabilities in physical security and IT infrastructure. We expect significant synergies with the installation expertise and on-site capabilities that we have developed.

By bringing together the strengths of both companies through this group partnership, we aim to further strengthen our ability to provide services across design, implementation, installation and maintenance, and to deliver services of higher quality and greater added value.

2. Structure Following Our Entry into the Group

After joining the group, the Company will continue to operate as an independent legal entity under the name THREE SIDE Co.,Ltd. Keisuke Aiki will continue as Representative Director.

While preserving our on-site focus and corporate culture, we will deepen our cooperation with 10X and further enhance our technical expertise, installation quality and project delivery capabilities.

We will continue to place the highest value on the trust of our customers and business partners, and aim to be an engineering company they can engage with confidence.

3. Message from the Representative Director
THREE SIDE Co.,Ltd
Keisuke Aiki, Representative Director

“The name THREE SIDE comes from Sanpo Yoshi, a longstanding Japanese business philosophy. Sanpo Yoshi means ‘good for the seller, good for the buyer and good for society’. Since our establishment, we have valued this philosophy above all else.

From the beginning, we have been guided by Sanpo Yoshi and the desire to be a company that creates value for our customers, partners and society.

When I heard that 10X also places Sanpo Yoshi at the heart of its management, combining this philosophy with speed and a willingness to take on challenges to create new value, I became convinced that, together with this company, we could create even greater value.

Joining the group is not simply about making our company larger. It is a new challenge: to help each of our engineers grow further and to become a company that can deliver even greater value to our customers.

We will continue to uphold the philosophy of Sanpo Yoshi and contribute to our customers, partners and society as a company trusted for its technical expertise.”

4. Company Profile

Company name: THREE SIDE Co.,Ltd
Address: 2-24-12 Shingashi, Itabashi-ku, Tokyo, Japan
Representative Director: Keisuke Aiki
Business: IT infrastructure implementation and installation
Established: May 2021
Date of joining the group: 1 October 2026

Enquiries regarding this announcement
THREE SIDE Co.,Ltd

Contact: Keisuke Aiki, Representative Director
Tel: 03-5918-6033
Email: