[Amended] Rights offering (paid-in capital increase) decision (subsidiary)

What happened

Amendment report (notice) Amendment date: 2026-09-29 1. Disclosure document being amended: Rights offering (paid-in capital increase) decision (material event concerning a subsidiary) 2. Original filing date of the disclosure document being amended: 2026-08-21 3. Reason for amendment: Amendment to reflect completion of payment 4. Amended items Item amended: 12. Payment date - Before: 2026-11-24 - After: 2026-09-28 Item amended: 22. Other important matters for investment decisions - Before: The above "12. Payment date" is the final payment completion date reflecting any forfeited shares and additional subscription by existing shareholders; if existing shareholders subscribe in full, the payment date is September 28 (U.S. Eastern Time). The above "12. Payment date" is the final payment completion date (U.S. Eastern Time). - After: as set out in the full text below.

Rights offering (paid-in capital increase) decision (material event concerning a subsidiary): Report on a material management matter of the subsidiary Absolics Inc. 1. Type and number of new shares: common shares 274,683; other class shares - 2. Par value per share (KRW): 1.40 3. Total shares issued before the capital increase: common shares 236,974; other class shares - 4. Purpose of raising funds: facility funds -; business acquisition funds -; operating funds (KRW) 401,114,915,289; debt repayment funds -; funds to acquire securities of other companies -; other funds - 5. Method of capital increase: Rights offering (allotment to existing shareholders) 6. New share issue price: confirmed issue price, common shares (KRW) 1,460,283; other class shares -; expected issue price -, expected confirmation date - 7. Method of determining the issue price: - 8. New-share allotment record date: 2026-08-20 9. Number of new shares allotted per share: - 10. Preferential allotment ratio for employee stock ownership association members (%): - 11. Expected subscription date: employee stock ownership association start -, end -; existing shareholders start -, end - 12. Payment date: 2026-09-28 13. Plan for handling forfeited shares: Additional subscription by existing shareholders and third parties 14. Dividend record date for the new shares: - 15. Expected date of delivery of new share certificates: - 16. Lead manager (where not a direct public offering): - 17. Whether the new share subscription rights are transferable: Not applicable 18. Board resolution date (decision date): 2026-08-20 - Attendance of independent (outside) directors: present -; absent - - Attendance of the auditor (audit committee member who is not an independent/outside director): - 19. Whether subject to securities registration statement filing: No 20. Reason exempted from filing: The company is an overseas unlisted corporation and is not subject to securities registration statement filing. 21. Whether subject to Fair Trade Commission reporting: No 22. Other important matters for investment decisions - This disclosure concerns the rights offering decision of Absolics Inc., in which the Company holds a 70.05% stake; because the capital raised is 2.5% or more of parent company SKC's equity in its most recent fiscal year (KRW 2.0257 trillion), this disclosure is made. - The USD amounts corresponding to "2.," "4." and "6." above are as follows, applying the trading base exchange rate first quoted on August 20, 2026 (1 USD = KRW 1,402.50): par value per share USD 0.001; operating funds USD 285,999,939.60; new share issue price USD 1,041.20. - "4. Purpose of raising funds" above corresponds to operating funds needed to commercialize semiconductor glass substrates. - "8." and "18." above are the date of approval by the board of Absolics Inc. - "12. Payment date" above is the final payment completion date (U.S. Eastern Time). - "13. Plan for handling forfeited shares" above: under the shareholders' agreement, if forfeited shares arise they may be allotted to existing shareholders or third parties; the specific allottees and number of shares will be determined after the results of the existing shareholders' subscription are confirmed. - A disclosure on the decision to acquire shares and equity securities of another company is expected to follow after a subsequent SKC board resolution. - The subsidiary's total assets (KRW) and the parent company's consolidated total assets (KRW) below are as of the end of 2025. - The above schedule and details may change as the process proceeds. Related disclosures: None

[Matters concerning the subsidiary] Subsidiary name: Absolics Inc. (English: Absolics Inc.) Representative: Kang Ji-ho Main business: Manufacture and sale of semiconductor glass substrates Whether a major subsidiary: Not applicable Subsidiary's total assets (KRW): 528,579,057,668 Parent company's consolidated total assets (KRW): 6,740,499,643,049 Ratio to parent company's consolidated total assets (%): 7.84