3714 FEC Announces Disposal of UniVista-KY Shares by Subsidiary Liangcai Investment, Generating NT$1.876 Billion in Gains

Announcement Date: July 8, 115 (2026) Statement Date: July 7, 115 (2026) Statement Time: 17:30:36 Company Code: 3714 Company Name: FEC Subject: Correction (Supplement to Announcement on July 3, 115) – Disposal of Ordinary Shares of UniVista Communications Semiconductor Holding (Cayman) Co., Ltd. by Subsidiary Liangcai Investment Applicable Clause: Clause 20 Factual Date: July 7, 115 (2026)

Details: 1. Security Name: Ordinary shares of UniVista Communications Semiconductor Holding (Cayman) Co., Ltd. (hereinafter "UniVista-KY")

2. Transaction Date: May 12, 115 (2026) to July 7, 115 (2026)

3. Board Approval Date: July 3, 115 (2026)

4. Other Approval Dates: Not applicable

5. Transaction Quantity, Unit Price, and Total Amount: Sold 40 million shares at market price Unit Price: NT$504.11 per share Total Transaction Amount: NT$2,016,423 million

6. Disposal Gain (or Loss) (Not applicable for acquisition of securities): The gain from the disposal of UniVista-KY privately placed ordinary shares is approximately NT$1,876 million (NT$1.876 billion)

7. Relationship with the Target Company: UniVista-KY is a related party of the company

8. Cumulative Holdings to Date (Including This Transaction): (1) FEC Holding Corporation Cumulative Holdings: 9,409 million shares Cumulative Holding Value: Approximately NT$373,055 million Cumulative Ownership Ratio: 7.78% Restrictions on Rights: None

(2) Liangcai Investment Corporation Cumulative Holdings: 5,393 million shares Cumulative Holding Value: Approximately NT$253,792 million Cumulative Ownership Ratio: 4.45% Restrictions on Rights: None

(3) Liangpin Investment Corporation Cumulative Holdings: 6,774 million shares Cumulative Holding Value: Approximately NT$244,147 million Cumulative Ownership Ratio: 5.60% Restrictions on Rights: 6,500 million privately placed ordinary shares are subject to regulations under the Securities and Exchange Act

(4) Jingcheng Semiconductor Corporation Cumulative Holdings: 20 million shares Cumulative Holding Value: Approximately NT$1,056 million Cumulative Ownership Ratio: 0.02% Restrictions on Rights: None

(5) FEC Optoelectronics Corporation Cumulative Holdings: 3,648 million shares Cumulative Holding Value: Approximately NT$126,023 million Cumulative Ownership Ratio: 3.02% Restrictions on Rights: 3,500 million privately placed ordinary shares are subject to regulations under the Securities and Exchange Act

Note: Except for Liangcai Investment (self-compiled including this transaction), all figures are based on the latest audited/reviewed financial reports.

9. Proportion of securities investments (including this transaction) under Article 3 of the "Asset Acquisition and Disposal Rules for Publicly Issued Companies" to total assets and equity attributable to owners of the parent in the latest financial statements, and the amount of working capital: Percentage of Total Assets: 0.61% Percentage of Shareholders' Equity: 0.61% Working Capital: NT$627,154 million

10. Specific Purpose of Acquisition or Disposal: Capital allocation adjustment

11. Directors Who Objected to This Transaction: None

12. Whether This Transaction is a Related-Party Transaction: No

13. Counterparty and Its Relationship with the Company: Not applicable

14. Date of Supervisor Approval or Audit Committee Consent: July 3, 115 (2026)

15. Previous Date of Material Information Disclosure on the Same Event: July 3, 115 (2026)

16. Other Disclosures: None