Treasury share disposal: results report

What happened

Treasury Share Disposal: Results Report / Fine Semitech

Treasury Share Disposal: Results Report To: Governor of the Financial Supervisory Service September 30, 2026 Company name: Fine Semitech Co., Ltd. Representative Director: Jang Kyung-bin Head office address: 15-23 Dongtan Sandan 6-gil, Hwaseong-si, Gyeonggi-do (Phone) 031-371-2400 (Website) http://www.fstc.co.kr Person responsible for preparation: (Title) Representative Director (Name) Jang Kyung-bin (Phone) 031-371-2400

1. Name and address of the issuer a. Name: Fine Semitech Co., Ltd. b. Address: 15-23 Dongtan Sandan 6-gil, Hwaseong-si, Gyeonggi-do

2. Details of the disposal report a. Filing date of the material event report: September 28, 2026 b. Disposal period: September 29, 2026 to September 30, 2026 c. Type and number of shares reported for disposal: Fine Semitech Co., Ltd. registered common shares (treasury shares), 149,614 shares

3. Disposal details (unit: KRW, shares)

Date: September 30, 2026; Type: Common shares; Order quantity: -; Disposed quantity: 9,614; Disposal price per share: 29,940; Total disposal value: 287,843,160; Disposal counterparty / brokering securities company: Executives and employees; Financial investment business entity's unique number: -

Date: September 29, 2026; Type: Common shares; Order quantity: -; Disposed quantity: 140,000; Disposal price per share: 31,200; Total disposal value: 4,368,000,000; Disposal counterparty / brokering securities company: Fine Semitech Employee Stock Ownership Association; Financial investment business entity's unique number: -

Total: Disposed quantity 149,614; Average disposal price per share 31,119; Total disposal value 4,655,843,160

4. Whether the disposal report details match the actual disposal Planned shares for disposal (shares): Common shares 149,614; Other shares - Total shares disposed (shares): Common shares 149,614; Other shares - Match: Match Reason if there is a discrepancy: -

5. Holding status of treasury shares, etc. after disposal [as of September 30, 2026] (unit: KRW million, shares, %)

Type of share: Common shares Holdings under Article 165-3 of the Act (A): Quantity 63,806; Ratio 0.29; Total value 300 Holdings under trust agreements, etc. under Article 165-3 of the Act (B): Quantity -; Ratio -; Contract amount - Total (A + B): Quantity 63,806; Ratio 0.29; Amount 300

* The above ratio is calculated relative to the total number of issued shares (21,649,789 shares).