Treasury share acquisition decision (subsidiary)

What happened

SK Discovery / Decision on Treasury Share Acquisition / (2026.07.21) Decision on Treasury Share Acquisition Decision on Treasury Share Acquisition: Material Management Matter Report of Subsidiary SK Plasma Co., Ltd.

1. Planned shares to be acquired (shares): Common shares: 3,070; Other class shares: - 2. Planned acquisition amount (KRW): Common shares: 90,720,000; Other class shares: - 3. Expected acquisition period: Start date 2026-07-22; End date 2026-07-24 4. Expected holding period: Start date -; End date - 5. Purpose of acquisition: Buy-back of employee stock ownership plan shares (treasury share acquisition) 6. Method of acquisition: Over-the-counter direct purchase 7. Entrusted investment broker: - 8. Treasury share holdings before acquisition Acquisition within distributable profit limits (shares): Common shares: -; Ratio (%): -; Other class shares: -; Ratio (%): - Other acquisitions (shares): Common shares: -; Ratio (%): -; Other class shares: -; Ratio (%): - 9. Acquisition decision date: 2026-07-21 - Attendance of outside directors: Present -; Absent - - Attendance of the auditor (audit committee member who is not an outside director): - 10. Daily purchase order quantity limit: Common shares: -; Other class shares: - 11. Other matters for reference in investment decisions - The above "2. Planned acquisition amount (KRW)" is the amount calculated by multiplying the number of shares requested for buy-back in each tranche by the issue price of that tranche, under the buy-back agreement. 1st tranche shares held: 1,620 shares; 1st tranche issue price: KRW 27,000 2nd tranche shares held: 1,450 shares; 2nd tranche issue price: KRW 32,400 - The above "4. Expected holding period" is marked "-" as the disposal plan for the treasury shares has not yet been determined, and will be decided in accordance with relevant laws and regulations in the future. - This decision to acquire treasury shares is made pursuant to Articles 45 and 45-2 of the Framework Act on Workers' Welfare and the employee stock ownership plan buy-back agreement between SK Plasma Co., Ltd. and its employee stock ownership association, and is unrelated to the "[Treasury Share Acquisition Amount Limit]" below. - This disclosure is a report on a material management matter of a subsidiary; the subsidiary's name is SK Plasma Co., Ltd., and its proportion of total assets as of the end of 2025 was 11.78%.

[Treasury Share Acquisition Amount Limit] Item / Amount: 1. Limit based on distributable profit under the Commercial Act as of the end of the previous fiscal year (a) Net assets: 379,785,811,470 (b) Capital stock: 9,876,683,500 (c) Total of capital reserves and earned surplus reserves accumulated through the previous fiscal year: 327,500,618,200 (d) Unrealized gains as prescribed by Presidential Decree: 957,544,912 Subtotal (a-b-c-d): 41,450,964,858 2. Amount of treasury shares acquired since the end of the previous fiscal year: - 3. Amount of dividends and related earned surplus reserve resolved at the regular general shareholders' meeting since the end of the previous fiscal year: 5,032,500,990 4. Amount of quarterly/interim dividends and related earned surplus reserve resolved by the board since the end of the previous fiscal year: - 5. Contract amount of trust agreements: - 6. Acquisition cost of shares disposed of (moving average method applied) in treasury share disposals since the end of the previous fiscal year: - Treasury share acquisition amount limit (1-2-3-4-5+6): 36,418,463,868

[Treasury Share Holdings Before This Acquisition Decision] (Unit: shares) Acquisition method / Share type / Beginning balance / Change (Acquired (+), Disposed (-), Retired (-)) / Ending balance / Remarks Acquisition within distributable profit limits - Direct acquisition - On-exchange direct purchase: Common shares: -, -, -, -, -, -; Other class shares: -, -, -, -, -, - Direct acquisition - Off-exchange direct purchase: Common shares: -, -, -, -, -, -; Other class shares: -, -, -, -, -, - Tender offer: Common shares: -, -, -, -, -, -; Other class shares: -, -, -, -, -, - Subtotal (a): Common shares: -, -, -, -, -, -; Other class shares: -, -, -, -, -, - Acquisition through trust agreement - Trustee-held volume: Common shares: -, -, -, -, -, -; Other class shares: -, -, -, -, -, - In-kind holdings: Common shares: -, -, -, -, -, -; Other class shares: -, -, -, -, -, - Subtotal (b): Common shares: -, -, -, -, -, -; Other class shares: -, -, -, -, -, - Other acquisitions (c): Common shares: -, -, -, -, -, -; Other class shares: -, -, -, -, -, - Total (a+b+c): Common shares: -, -, -, -, -, -; Other class shares: -, -, -, -, -, -