Non-Registered Executive Reports Small Insider Stake Change to 600 Shares

Report on Ownership of Specified Securities by Executives and Major Shareholders 6.1 SK Hynix Inc. 2026-06-01 Report on Ownership of Specified Securities by Executives and Major Shareholders To: Securities and Futures Commission To: Korea Exchange Reporting obligation trigger date: June 1, 2026 Report preparation reference date: June 9, 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 preparation guidelines, and that there are no false statements or omissions of material matters. Reporter: Joo Young-pyo 1. Information on the Issuing Company Company Name: SK Hynix Inc. Corporation Type: KOSPI-listed corporation Company Code: 000660 Total Issued Shares: 712,702,365 2. Information on the Reporter Report Type: Change Reporter Category: Individual (Domestic) Name (Korean): Joo Young-pyo Name (Chinese/English): 朱英杓 Date of Birth or Business Registration No.: 790127 Address (to eup/myeon/dong level): Seonneung-ro, Gangnam-gu, Seoul Relationship with Issuer: Executive (Registered status): Non-registered executive Title: Research Fellow Appointment Date: January 1, 2026 Retirement Date: - Major Shareholder: - Business Contact: Affiliated Company: SK Hynix Inc. 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 Owned Prior report (Feb 6, 2026): Specified securities 296 shares (0.00%); Common stock 296 shares (0.00%) This report (Jun 9, 2026): Specified securities 600 shares (0.00%); Common stock 600 shares (0.00%) Change: +304 shares (0.00%); Common stock +304 shares (0.00%) B. Ownership Breakdown by Type of Specified Securities Common stock (A): 600 shares Warrant certificates (B): - Convertible bonds (C): - Bonds with warrants (D): - Profit-participating bonds (E): - Exchangeable bonds (F): - Depositary receipts (G): - Other (H): - Total (I): 600 shares (0.00%) Total issued shares (J): 712,702,365 Non-stock specified securities (B+C+D+E+F+G+H=I): 0 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% ※ Only exchangeable bonds whose underlying asset is stock, and depositary receipts/derivative-linked securities whose underlying asset is stock, are excluded from the denominator when calculating ownership ratio. C. Detailed Change History 1) Reason: Other (+); Change date: June 1, 2026; Security type: Common stock; Before: 296 → Change: +259 → After: 555; Unit price: -; Note: Withdrawal from ESOP (Employee Stock Ownership Association) account into personal account. 2) Reason: On-market purchase (+); Change date: June 1, 2026; Security type: Common stock; Before: 555 → Change: +45 → After: 600; Unit price: KRW 2,391,000; Note: - Total: Before 296 → Change +304 → After 600; Unit price: KRW 2,391,000 * For trades on the securities market, the contract settlement date applies. ** For non-stock securities, this refers to the exercise (conversion/exchange) price of the security, or the trading unit price of the stock acquired/disposed via the security's right exercise; amounts in parentheses indicate the trading unit price of the security itself.