Non-Registered Executive Exercises Stock Options, Raises Holdings to 4,205 Shares

Report on Ownership of Specific Securities by Executives and Major Shareholders 6.1 SK hynix Inc. 2026-06-05 Report on Ownership of Specific Securities by Executives and Major Shareholders To: Securities and Futures Commission To: Korea Exchange Date reporting obligation arose: June 5, 2026 Report preparation reference date: June 9, 2026 * The undersigned reporter confirms that, as of the report preparation reference date, the ownership status of his specific securities has been accurately prepared in accordance with relevant laws and preparation instructions, and that there are no material misstatements or omissions. Reporter: Choi Jun-ki 1. Information on the Issuing Company - Company name: SK hynix Inc. - Corporate classification: KOSPI-listed company - Company code: 000660 - Total shares issued: 712,702,365 2. Information on the Reporter - Report classification: Change - Reporter classification: Individual (domestic) - Name (Korean): Choi Jun-ki - Name (Hanja/English): 崔準基 - Date of birth or business registration number: 680223 - Address (down to town/district level): Sinyul-ro, Seowon-gu, Cheongju-si, Chungcheongbuk-do - Relationship with issuer: Executive (registration status): Non-registered executive - Position title: In charge - Appointment date: January 1, 2016 - Retirement date: - - Major shareholder: - Business contact: - Affiliated company: SK hynix Inc. - Department: IR - Position: TL - Phone: 031-80******* - Name: Choi Seo-yun - Fax: 031-8093-4578 - Email: ******n.choi@sk.com 3. Ownership Status of Specific Securities a. Number and Ratio of Specific Securities Owned - Previous report (December 5, 2025): Specific securities 2,000 shares (0.00%); Common shares 2,000 (0.00%) - This report (June 9, 2026): Specific securities 4,205 shares (0.00%); Common shares 4,205 (0.00%) - Change: +2,205 shares (0.00%); Common shares +2,205 (0.00%) b. Ownership Details by Type of Specific Securities - Common shares (A): 4,205 - Warrants (B): - - Convertible bonds (C): - - Bonds with warrants (D): - - Profit-participating bonds (E): - - Exchangeable bonds (F): - - Depositary receipts (G): - - Other (H): - - Total (I): 4,205 (0.00%) - Total shares issued (J): 712,702,365 - Non-stock specific securities (B+C+D+E+F+G+H = I): 0 - Ownership ratio: 0.00% - Specific securities ownership ratio [(A+I) / (J+I-(F+G+H))] × 100: 0.00% - Common share ownership ratio (A / J) × 100: 0.00% * Only exchangeable bonds with stock as underlying, depositary receipts and derivative-linked securities backed by stock are excluded from the denominator when calculating ownership ratio. c. Detailed Change History - Reason for change: Stock option exercise (+) - Date of change: June 5, 2026 - Type of specific securities: Common stock - Shares before change: 2,000 - Change: +2,205 - Shares after change: 4,205 - Acquisition/disposal unit price (KRW): 124,220 (stock option exercise price) - Notes: - - Trading plan report date: - - Total: Before 2,000 / Change +2,205 / After 4,205 / Price 124,220 * For stock options, the acquisition/disposal unit price refers to the exercise price of the stock option. * For trades on the securities market, the date of change is the contract settlement date. ** For non-stock securities, this means the exercise (conversion/exchange) price of the relevant security, or the trading unit price of stock acquired/disposed through the exercise of rights on the relevant security; amounts in parentheses indicate the trading unit price of the relevant security.