Insider Shareholding Report: Non-Registered Executive Withdraws 42 Shares from ESOP

Report on Ownership of Specified Securities by Executives and Major Shareholders 6.1 SK Hynix Co., Ltd. 2026-05-06 Report on Ownership of Specified Securities by Executives and Major Shareholders To: Securities and Futures Commission To: Korea Exchange Date of reporting obligation event: May 6, 2026 Report preparation reference date: May 8, 2026 * The reporter hereby confirms that, as of the report preparation reference date, the ownership status of his specified securities has been accurately prepared in accordance with the relevant laws and regulations and the instructions for preparation, and that there are no false statements or omissions regarding material matters. Reporter: Yang Myung-hoon 1. Information on the Issuing Company - Company name: SK Hynix Co., Ltd. - Corporate classification: KOSPI-listed corporation - Company code: 000660 - Total number of issued shares: 712,702,365 2. Information on the Reporter - Reporting category: Change - Reporter classification: Individual (domestic) - Name (Korean): Yang Myung-hoon - Name (Chinese/English): 梁明勳 - Date of birth or business registration number, etc.: 730608 - Address (head office location) [up to eup/myeon/dong level]: Gumi-ro, Bundang-gu, Seongnam-si, Gyeonggi-do - Relationship with issuing company: Executive (registered status): Non-registered executive - Position title: In charge of (department) - Appointment date: January 1, 2026 - Retirement date: - - Major shareholder: - Business contact and contact person: - Affiliated company: SK Hynix Co., Ltd. - Department: IR - Position: TL - Phone: 031-80******* - Name: Choi Seo-yoon - Fax: 031-8093-4578 - Email: ******n.choi@sk.com 3. Ownership Status of Specified Securities A. Number and ownership ratio of specified securities held Report preparation reference date | Specified securities — number (shares) | Ratio (%) | Common stock — number of shares | Ratio (%) - Previous report (January 7, 2026): 126 / 0.00 / 126 / 0.00 - This report (May 8, 2026): 168 / 0.00 / 168 / 0.00 - Change: +42 / 0.00 / +42 / 0.00 B. Holdings by type of specified securities Details of specified securities: - Common stock (A): 168 shares - Warrant certificates (B): - - Convertible bonds (C): - - Bonds with warrants (D): - - Participating bonds (E): - - Exchangeable bonds (F): - - Depositary receipts (G): - - Other (H): - - Total (I): 168 shares (0.00%) Total issued shares (J): 712,702,365 Number of specified securities other than shares (B+C+D+E+F+G+H = I): 0 Ownership ratio (%): 0.00 Ownership ratio of specified securities [(A+I) / (J+I − (F+G+H))] × 100: 0.00 Ownership ratio of common stock (A / J) × 100: 0.00 * For exchangeable bonds whose exchange target is shares, and depositary receipts/derivatives-linked securities whose underlying asset is shares, such instruments are excluded from the denominator when calculating the ownership ratio. C. Detailed change history Reason for change | Date of change* | Type of specified securities | Shares held before | Change | Shares held after | Acquisition/disposal unit price (KRW)** | Remarks | Trading plan report date - Other (+) | May 6, 2026 | Common stock | 126 | +42 | 168 | - | Withdrawal from Employee Stock Ownership Association (ESOP) account into personal account | - - Total | | | 126 | +42 | 168 | - | - | * For trades executed on the securities market, the contract settlement date. ** For securities other than shares, refers to the exercise (conversion/exchange) price of the relevant security or the trading unit price of shares acquired/disposed of through exercising the rights attached to the relevant security; amounts in parentheses indicate the trading unit price of the relevant security.