Securities Report – 151st Fiscal Period (April 1, 2025 – March 31, 2026)

Taiheiyo Kosei Co., Ltd. Securities Report – 151st Fiscal Period (April 1, 2025 – March 31, 2026)

This report is an official document submitted by Taiheiyo Kosei Co., Ltd. in accordance with Japan's Financial Instruments and Exchange Act, intended for investors and market participants. The fiscal period covered by this report spans from April 1, 2025, to March 31, 2026, and aims to provide accurate and comprehensive disclosure regarding the company's financial position, operating results, and cash flows during this period.

The report includes both consolidated and individual financial statements, prepared in compliance with applicable accounting standards. It also contains information on management policies, earnings forecasts, risk factors, corporate governance, executive compensation, major shareholders, and a list of consolidated subsidiaries.

The company prioritizes sustainable growth and strengthening trust with stakeholders, including shareholders. As part of this commitment, it continuously enhances the quality and quantity of its disclosures, positioning this report as a key component of transparent corporate communication.

In preparing this report, the company has focused on strengthening internal management systems and the effectiveness of internal controls over financial reporting, ensuring accuracy and reliability. The report has undergone audit by an independent external audit firm, whose opinion is included herein.

Going forward, the company will continue to promote transparent management and strive to enhance long-term corporate value. The company sincerely requests investors to review this report to better understand its operations and to continue their support in the future.