Treasury share disposal: results report

What happened

Treasury share disposal results report To the Governor of the Financial Supervisory Service August 26, 2026 Company name: SK Inc. CEO: Choi Tae-won, Jang Yong-ho Head office address: 26 Jongno, Jongno-gu, Seoul Phone: 02-2121-5114 Website: https://www.sk.co.kr Preparer: Kwon Byeong-don, Head of Financial Strategy, Phone 02-2121-5114

1. Issuer's name and address a. Name: SK Inc. b. Address: 26 Jongno, Jongno-gu, Seoul

2. Disposal report details a. Material event report submission date: August 25, 2026 b. Disposal period: August 26, 2026 - August 26, 2026 c. Type and number of shares disposed in this report: 1,487 registered common shares in total

3. Disposal details (unit: KRW, shares) Date: August 26, 2026; Type: Common shares; Order quantity: 1,487; Shares disposed: 1,487; Disposal price per share: 554,000; Total disposal amount: 823,798,000; Disposal target: Officers, etc.; Brokerage securities company: SK Securities; Financial investment business entity ID: 00131850 Total: shares disposed 1,487; disposal price per share 554,000; total disposal amount 823,798,000 * The "disposal price per share" and "total disposal amount" above are stated based on the closing price on the disposal date. ** This disposal was carried out by transferring shares from the Company's treasury stock account to the account of each grant recipient, for the purpose of granting Stock Grants to independent directors and paying long-term incentive compensation to officers (including retired officers). For details of the disposal decision, please refer to the "Material event report (treasury share disposal decision)" disclosure submitted by the Company on August 25, 2026.

4. Whether the disposal report matches the actual disposal Planned shares to dispose (shares): common 1,487, other - Total shares disposed (shares): common 1,487, other - Match: Match Reason for discrepancy, if any: -

5. Holding status of treasury shares, etc. after disposal [as of August 26, 2026] (unit: KRW million, shares, %) Share type: Common shares Holdings under Article 165-3 (A): quantity 7,000,583, ratio 9.6, total value 1,948,758 Holdings under trust agreements under Article 165-3 (B): quantity -, ratio -, contract amount - Total (A+B): quantity 7,000,583, ratio 9.6, amount 1,948,758 Total (all share types): quantity 7,000,583, ratio 9.6, amount 1,948,758 * The ratios above are as a percentage of total issued shares. ** The total value and amount above are book values including fees. *** As of the submission date, the Company holds 17,959,328 common treasury shares and 1,787 preferred treasury shares (17,961,115 total), including treasury shares arising under Article 341-2 of the Commercial Act from the merger process with (former) SK Inc. and (former) SK Materials Co., Ltd.

[Treasury share holding status after disposal] (unit: shares) Acquisition method: Direct acquisition within distributable-profit limit - on-exchange direct acquisition Common shares: beginning balance 7,000,583, acquired -, disposed -, retired -, ending balance 7,000,583 Other shares: beginning -, acquired -, disposed -, retired -, ending - Off-exchange direct acquisition: common shares and other shares all - Tender offer: common shares and other shares all - Subtotal (a): common shares beginning 7,000,583 / ending 7,000,583; other shares all - Acquisition under trust agreement - trustee-held volume: common shares and other shares all - - in-kind holdings: common shares and other shares all - Subtotal (b): common shares and other shares all - Other acquisition (c): common shares beginning 10,980,116, disposed 21,371, ending 10,958,745; other shares beginning 1,787, ending 1,787 Total (a+b+c): common shares beginning 17,980,699, disposed 21,371, ending 17,959,328; other shares beginning 1,787, ending 1,787 * The "beginning balance" is the treasury share holding as of the start of the fiscal year (January 1, 2026); the "ending balance" is the treasury share holding as of the submission date (August 26, 2026).