A new start as THREE SIDE Co.,Ltd
from 1 October 2026
スリーサイドコンサルティング株式会社 (Three Side Consulting; head office: Chiyoda-ku, Tokyo; Representative Director: Keisuke Aiki; hereinafter “the Company”) announces that it will change its company name and relocate its registered head office, effective 1 October 2026.
1. Details of the Changes (Effective 1 October 2026)
Company name
Before the change:
スリーサイドコンサルティング株式会社 (Three Side Consulting)
After the change:
スリーサイド株式会社
English name: THREE SIDE Co.,Ltd
Registered head office
Before the change:
18 Kanda Kitanorimonocho, Chiyoda-ku, Tokyo 101-0036, Japan
After the change:
2-24-12 Shingashi, Itabashi-ku, Tokyo 175-0081, Japan
Tel: 03-5918-6033
Email domain
Before the change: @threeside-consulting.com
After the change: @three-side.jp
Emails sent to the former domain will be forwarded to the new domain until 31 December 2026.
Corporate website
2. Background to the Changes
The Company will become a group company of 10X Co., Ltd. (head office: Minato-ku, Tokyo; Representative Director: Ryohei Tanaka), effective 1 October 2026. Taking this opportunity, we will adopt a company name that better reflects our business, which centres on IT infrastructure implementation and installation, and relocate our registered head office to Itabashi-ku, Tokyo, as we begin operating under a new structure.
Our new name, THREE SIDE, comes from Sanpo Yoshi—‘good for the seller, good for the buyer and good for society’—the business philosophy we have valued since our establishment. Guided by this philosophy, we will continue to strive to be a company that creates value for our customers, partners and society.
For details of our entry into the group, please see “Announcement of Joining the 10X Group”.
3. To Our Customers and Business Partners
This is a change of company name; the legal entity will remain the same. No additional procedures are required for existing contracts with us. Our qualified invoice issuer registration number will also remain unchanged.
We kindly ask you to update the company information held in your records, including our name, address and email addresses.
4. Company Profile Following the Changes
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
Enquiries regarding this announcement
THREE SIDE Co.,Ltd
Contact: Keisuke Aiki, Representative Director
Tel: 03-5918-6033
Email: info@three-side.jp