ADTANK Announces Acquisition of Shares in AtoJ Inc., Making it an Equity-Method Affiliate

ADTANK Inc. (Headquarters: Taito-ku, Tokyo; CEO: Kenichi Kanno; hereinafter "ADTANK") announced that on April 1, 2026, it acquired shares of AtoJ Inc. (Headquarters: Minato-ku, Tokyo; President: Yuya Hiyaka; hereinafter "AtoJ"), a company providing one-stop support from EC site construction to digital marketing, making it an equity-method affiliate.

### Reasons for the Share Acquisition ADTANK has been operating under the philosophy of "Overcoming through Change," integrating advertising resources across both physical and digital platforms with executive knowledge in management, marketing, sales, and DX to support corporate growth and transformation (TURN) at an operational level.

AtoJ, on the other hand, possesses strengths in one-stop solutions covering everything from EC site construction to comprehensive digital marketing.

In today's EC market, consumer purchasing behavior is becoming increasingly sophisticated and diverse. It is no longer enough to simply support customer attraction or site construction; it has become vital to provide integrated support from attraction to conversion and further to LTV (Lifetime Value) improvement to maximize business results.

Based on this background, ADTANK decided that fusing the expertise and resources of both companies would create significant synergy and contribute greatly to the business growth of client companies, leading to this share acquisition.

Moving forward, both companies will deepen their cooperation as strategic partners, aiming to enhance competitiveness in the digital marketing market and achieve sustainable corporate value growth.

### Overview of the New Equity-Method Affiliate - Name: AtoJ Inc. - Location: 8F Minami Aoyama DF Building, 2-2-8 Minami Aoyama, Minato-ku, Tokyo - Representative: Yuya Hiyaka, President - Business: EC site construction/implementation support, content marketing support, owned media implementation support - Capital: 132,375 thousand yen (including capital reserves) *As of April 1, 2022 - Established: March 9, 2007

### About ADTANK Inc. ADTANK integrates advertising resources in both physical and digital domains with practical expertise in management, marketing, sales, and DX to support corporate growth and transformation (TURN) at an implementation level.

- Company Name: ADTANK Inc. - Location: 7F Yamaguchi Building 7, 4-19-9 Taito, Taito-ku, Tokyo 110-0016 - Established: 1992 - Representatives: Kenichi Kanno (CEO), Mitsuyasu Iizawa (COO) - Business: Planning and sales of "ADTURN" (consulting & advertising package service), DX of sales promotion, digital marketing using AI, etc. - URL: https://adtank.co.jp/