Note: This document has been translated from a part of the Japanese original for reference purposes only. In the event of any discrepancy between this translated document and the Japanese original, the original shall prevail.

June 17, 2026

Company name: CUBE SYSTEM INC.
Name of representative: Masahiro Nakanishi,
Representative Director and President
(Securities code: 2335;
Tokyo Stock Exchange, Prime Market)
Inquiries: Hirofumi Kitagaki,
Seniority Corporate Officer, President's Office
Telephone: +81-(0)3-5487-6030

Notice Regarding Controlling Shareholder, etc.

CUBE SYSTEM INC. hereby announces the following matters concerning controlling shareholders, etc. with respect to Nomura Research Institute, Ltd. (NRI), which is an affiliated company.

1. Trade Name, etc. of Parent Company, Controlling Shareholder (excluding Parent Company) or Other Affiliated Company

(As of March 31, 2026)

2. Position of the Listed Company within the Corporate Group of the Parent Company, etc. and Other Relationships

(1) Position within the Corporate Group
NRI is classified as an "other affiliated company" holding 20.21% of the Company's voting rights.

(2) Business Constraints, Risks and Benefits Arising from Belonging to the Corporate Group
NRI and its group companies constitute a major and stable business partner of the Company Group, accounting for 48.7% of the Company Group's sales in the most recent fiscal year.
Changes in the business conditions of the NRI group may have a significant impact on the performance of the Company Group.

(3) Policy on Ensuring a Certain Degree of Independence from the Parent Company, Measures Therefor, and Status of Securing Independence
The Company conducts its business activities and management decisions under its own responsibility, thereby ensuring a certain level of independence from NRI. Furthermore, transactions with NRI and its group are conducted under terms and conditions, including pricing, determined through negotiations in the same manner as with other general business partners, and the Company believes that it maintains independent management judgment.

3. Matters Concerning Transactions with the Parent Company

Fiscal Year Ended March 31, 2026 (From April 1, 2025 to March 31, 2026)

Note: Transaction amounts and balances represent figures for NRI on a non-consolidated basis.