【CMC Magnetics】Announcement on the Company's Disposal of Marketable Securities

1. Security Name: Adata Technology Common Stock 2. Transaction Dates: 2026/4/14~2026/4/17 3. Date of Board of Directors' Resolution: Not applicable 4. Other Approval Dates: Approval Level: Chairman's approval April 17, 2026 5. Transaction Quantity, Unit Price and Total Transaction Amount: Transaction Quantity (thousand shares): 880 Unit Price (NTD): 377.01 Total Transaction Amount (NTD): 331,772,900 6. Disposal Profit (or Loss) (Not applicable to acquirers of marketable securities): Disposal Profit: NTD 5,073,514 7. Relationship with the Transacting Company: None 8. As of now, cumulative holdings of these securities (including this transaction), amount, shareholding ratio, and restrictions on rights (e.g., pledge status): Remaining Holdings: 1,221,000 shares, Amount: NTD 454,862,097 Shareholding Ratio: 0.37%, Restrictions on Rights: None 9. As of now, the ratio of investment in marketable securities (including this transaction) listed in Article 3 of the "Regulations Governing the Acquisition and Disposal of Assets by Public Companies" to the company's most recent financial report's total assets and equity attributable to owners of parent, and the amount of working capital in the most recent financial report: Ratio to Total Assets: 76.32% Ratio to Equity Attributable to Owners of Parent: 106.90% Working Capital Amount: NTD 8,285,327 thousand 10. Specific Purpose of Acquisition or Disposal: Investment Portfolio 11. Opinions of Dissenting Directors in this Transaction: None 12. This transaction is a related party transaction: No 13. Counterparty and its relationship with the company: Not applicable 14. Date of Approval by Supervisors or Audit Committee: Not applicable 15. Date of previous material information disclosure regarding the same event: Not applicable 16. Other Explanations: The authorized trader was authorized on March 31, 2026, to conduct marketable securities transactions in the centralized trading market during the second quarter of 2026. Keywords: Material Information