Amended Securities Report – 120th Fiscal Period (2025/04/01 – 2026/03/31)

Daibosan Kogyo Co., Ltd. Amended Securities Report – 120th Fiscal Period (2025/04/01 – 2026/03/31)

This document is an amended securities report submitted by Daibosan Kogyo Co., Ltd. pursuant to the Financial Instruments and Exchange Act, covering financial condition and operating results for the 120th fiscal period from April 1, 2025, to March 31, 2026. The amendment was made due to identified errors or omissions in the previously filed securities report, including misapplication of revenue recognition accounting policies, reassessment of fixed asset impairment losses, and insufficient disclosure regarding transactions with affiliated companies. As a result of these corrections, there are revisions to reported figures for net sales, net income, and net assets. The company reaffirms its commitment to enhancing the reliability of financial reporting and strengthening corporate governance. This amended report has been filed with the Financial Services Agency and is publicly available via EDINET. Investors are advised to review the updated information for informed decision-making.