【Dynamic Electronics Holding】Announcement on behalf of its subsidiary, Supermicro Electronic Circuit Co., Ltd., regarding the board's approval of the 2026 First Quarter Financial Report

1. Date of Occurrence of the Event: 2026/04/29 2. Company Name: Supermicro Electronic Circuit Co., Ltd. 3. Relationship with the Company (please enter 'parent company' or 'subsidiary'): Subsidiary 4. Mutual shareholding ratio: 86.0989% 5. Reason for occurrence: Announcement on behalf of the subsidiary regarding the board's approval of the proposal: Regarding the company's 2026 First Quarter Report. 6. Countermeasures: Announcement on behalf of the subsidiary on the Market Observation Post System. 7. Other matters that should be specified (if the subject of the event or resolution is a public company or above, this major information also complies with Article 7, Paragraph 9 of the Enforcement Rules of the Securities and Exchange Act, which states matters that have a significant impact on shareholders' equity or securities prices): (1) 2026 First Quarter Operating Revenue: RMB 1.35 billion, an increase of 27.56% compared to RMB 1.058 billion in the same period last year. (2) 2026 First Quarter Net Profit: RMB -0.096 billion, a decrease of 233.72% compared to RMB 0.072 billion in the same period last year (turned from profit to loss). (3) 2026 First Quarter Earnings Per Share: RMB -0.22, a decrease of 215.79% compared to RMB 0.19 in the same period last year (turned from profit to loss). (4) The main reasons for the profit turning into a loss in this period are significant exchange rate fluctuations, which led to a substantial increase in exchange losses; furthermore, the Thailand factory's capacity is still in the ramp-up phase, resulting in higher fixed costs and unmaterialized benefits, coupled with the impact of rising raw material prices, which caused a decline in gross profit margin compared to the same period last year. (5) The financial data for the first quarter of 2026 contained in this announcement is internal accounting data only and has not been audited by an accounting firm. Investors are advised to be aware of investment risks. (6) To ensure consistent information disclosure and protect the rights and interests of investors in Taiwan and Shanghai, the release date of this announcement is coordinated with the online posting time of the Shanghai Stock Exchange. Keywords: Material Information