Material event report (treasury share disposal) (subsidiary)

What happened

Material Event Report / Korea Exchange Reporting Obligation Material Management Matter Notification of Subsidiary SK hynix Inc.

To: Financial Services Commission / Korea Exchange Date: August 7, 2026

Company name: SK hynix Inc. Representative Director: Kwak No-jeong Head office address: 2091 Gyeongchung-daero, Bubal-eup, Icheon-si, Gyeonggi-do (Tel) 031-5185-4114 (Website) http://www.skhynix.com Preparer: (Title) Head of Finance Division (Name) Kim Woo-hyun (Tel) 031-5185-4114

Decision on Treasury Share Disposal

1. Planned shares for disposal (shares): Common shares 82; Other shares - 2. Price per share subject to disposal (KRW): Common shares 1,495,000; Other shares - 3. Planned disposal amount (KRW): Common shares 122,590,000; Other shares - 4. Planned disposal period: Start date August 8, 2026; End date September 7, 2026 5. Purpose of disposal: Payment of independent director compensation 6. Disposal method: Pro-rata disposal to shareholders (shares) -; After-hours block trade (shares) -; Over-the-counter disposal (shares) -; Other (shares) 82 7. Disposal counterparty: Independent directors 8. Brokerage investment dealer: SK Securities Co., Ltd. 9. Treasury share holdings before disposal Acquired within distributable profit range (shares): Common shares 1,626,236; Ratio 0.2%; Other shares -; Ratio - Other acquisition (shares): Common shares 73; Ratio 0.0%; Other shares -; Ratio - 10. Holding/disposal plan: Shareholders' meeting approval date March 25, 2026 11. Disposal decision date: August 7, 2026 - Attendance of independent (outside) directors*: Present 6; Absent 0 - Attendance of auditor (audit committee member who is not an independent (outside) director*): - 12. Daily sell order quantity limit: Common shares -; Other shares - * For listed companies, this refers to independent directors; for unlisted companies, outside directors. 13. Other matters for reference in investment decisions - The above "1. Planned shares for disposal" may change within the limit approved by the board, depending on share price fluctuations at the time of treasury share delivery. - The above "2. Price per share subject to disposal" is based on the closing price on August 6, 2026, the day before the board resolution date. - The above "3. Planned disposal amount" is the closing price on the day before the board resolution date multiplied by the planned number of shares for disposal; the actual number of shares disposed, share price, and disposal amount may change as of the disposal date. - Regarding the above "4. Planned disposal period," delivery of the treasury shares is scheduled to take place on or after August 19, 2026. - The above "6. Disposal method" will be carried out by transferring shares from the company's treasury share account to the individual accounts of the recipients.

[Treasury Share Holdings Before the Treasury Share Disposal Decision] (Unit: shares) Columns: Acquisition method; Share type; Beginning quantity; Acquisition(+); Disposal(-); Retirement(-); Ending quantity; Remarks

Acquired within distributable profit range - Direct acquisition - On-market direct acquisition: Common shares: 17,377,728; -; 451,492; 15,300,000; 1,626,236; -. Other shares: -; -; -; -; -; - Acquired within distributable profit range - Direct acquisition - Off-market direct acquisition: Common shares: -; -; -; -; -; -. Other shares: -; -; -; -; -; - Acquired within distributable profit range - Direct acquisition - Tender offer: Common shares: -; -; -; -; -; -. Other shares: -; -; -; -; -; - Subtotal (a): Common shares: 17,377,728; -; 451,492; 15,300,000; 1,626,236; -. Other shares: -; -; -; -; -; - Acquisition via trust contract - Trustee-held volume: Common shares: -; -; -; -; -; -. Other shares: -; -; -; -; -; - Acquisition via trust contract - Physically held volume: Common shares: -; -; -; -; -; -. Other shares: -; -; -; -; -; - Subtotal (b): Common shares: -; -; -; -; -; -. Other shares: -; -; -; -; -; - Other acquisition (c): Common shares: -; 73; -; -; 73; -. Other shares: -; -; -; -; -; - Total (a+b+c): Common shares: 17,377,728; 73; 451,492; 15,300,000; 1,626,309; -. Other shares: -; -; -; -; -; -

Note: The company acquired 73 treasury shares as "other acquisition" in May 2026, in connection with the handling of fractional shares arising from the exercise of the early redemption request (Clean-up Call Option) on exchangeable bonds issued by the company on April 11, 2023. - The above "beginning quantity" is the treasury share holding as of the start of the current fiscal year (January 1, 2026); the "ending quantity" is the treasury share holding as of the date of submission of this disclosure document (August 7, 2026).

[Additional Disclosure Matters] 1. Relationship of each disposal counterparty to the company or the largest shareholder: 6 independent directors 2. Reason for selecting the disposal counterparty: Independent directors in office as of the payment date. The compensation was changed in consideration of the competitiveness of independent director compensation and the difficulty of the role, in an environment of expanding director legal liability, enhanced roles, and an expanding scope of supervised business areas. 3. Number of shares disposed per counterparty: SK hynix common shares, 82 shares 4. Basis for price calculation: Based on the closing price on August 6, 2026, the day before the board resolution date 5. Expected dilutive effect on share value: The number of treasury shares to be disposed of is less than 0.0001% of total issued shares, so the dilutive effect on share value is negligible. 6. Other matters for reference in investment decisions: Not applicable.