Macronix Notifies Public of Convertible Bond MX2 (Code: 23372) Price Fluctuation Meeting Announcement Threshold per TPEx Request

1. Event Date: July 9, 2026 (R.O.C. Year 115)

2. Reason for Announcement: At 9:25 a.m. today, Macronix received notification from the Taipei Exchange (TPEx) that its convertible bond, Macronix Two (code: 23372), has reached the threshold requiring disclosure of trading alerts. In compliance with TPEx instructions, the company is releasing the following information for investor reference.

3. Convertible Bond Information:

- Bond Name: Macronix Two (23372) - Maturity Date: March 24, 2028 (R.O.C. Year 117) - Total Issuance Amount: NT$3,000,000,000 - Outstanding Issuance Balance (as of July 9, 2026): NT$101,200,000 - Latest Conversion Price: NT$23 per share - Closing Price of Underlying Stock (code: 2337): NT$143.5 (as of July 9, 2026) - Closing Price of Convertible Bond (code: 23372): NT$664 (as of July 9, 2026)

4. Other Disclosures: None.