[Amended] Material event report (rights offering)

What happened

Material Event Report (Rights Offering) HanWool Semiconductor Co., Ltd.

Amendment Report, September 30, 2026 1. Disclosure document being amended: Material Event Report (Rights Offering Decision) 2. Original submission date of the disclosure document: April 15, 2026 3. Amended items

Item: Rights offering decision Reason for amendment: Since submitting the securities registration statement on April 15, 2026, the company has continuously supplemented the key contents of the registration statement in response to the Financial Supervisory Service's amendment requests, among other matters. However, as the registration statement review and amendment process has continued over an extended period, the fundraising schedule, business implementation timing, the company's fund management conditions, and market conditions have changed compared to when the rights offering was first decided, creating a need to re-examine the existing rights offering plan and overall use-of-proceeds plan. Having comprehensively reviewed the current business environment, financial condition, investment priorities by business, and actual funding needs, the company determined that it would better serve the interests of the company and its shareholders to re-establish its future business and fundraising plans rather than proceed with the existing rights offering plan as is. Accordingly, the company has decided to withdraw its decision to conduct the rights offering via general public subscription for forfeited shares following shareholder allotment, and to withdraw the related securities registration statement. This withdrawal of the rights offering does not mean discontinuation of the company's existing business or new growth businesses; the company will re-examine the scale and method of funding needed, comprehensively considering its future operating cash flow, financial condition, business progress, and market conditions. Before: Rights offering decision After: Rights offering withdrawn

Material Event Report / Korea Exchange Reporting Obligation To the Financial Services Commission / Korea Exchange April 15, 2026

Company name: HanWool Semiconductor Co., Ltd. CEO: Kim Baek-san Head office: 104-dong 1001-ho, 166 Gosan-ro, Gunpo-si, Gyeonggi-do (Dangjeong-dong, SK Ventium) Tel: 031-429-2401 Website: http://www.hanwoolsemi.com Preparer: Senior Vice President Lim Se-hyuk, Tel 031-429-2401

Rights Offering Decision 1. Type and number of new shares: common shares -; other shares - 2. Par value per share (KRW): - 3. Total shares issued before the capital increase: common shares -; other shares - 4. Purpose of fundraising: facility funds -; business acquisition funds -; working capital -; debt repayment funds -; funds for acquiring securities of other companies -; other funds - 5. Capital increase method: General public subscription for forfeited shares following shareholder allotment Matters concerning other shares: basis in articles of incorporation -; content of shares -; other - 6. New share issue price: fixed issue price - common shares -, other shares -; expected issue price - common shares -, expected determination date -; other shares -, expected determination date - 7. Method of determining issue price: - 8. New share allotment record date: - 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 date -, end date -; existing shareholders start date -, end date - 12. Payment date: - 13. Plan for handling forfeited shares: - 14. New shares' dividend record date: - 15. Expected date of delivery of new share certificates: - 16. Expected listing date of new shares: - 17. Lead underwriter (if not a direct public offering): - 18. Whether pre-emptive rights are transferable: Yes; Whether pre-emptive right certificates are listed: Yes; Financial investment business entity handling trading/brokerage of the certificates: - 19. Board resolution date (decision date): - Independent (outside) director* attendance: Present (persons) -; Absent (persons) - Auditor (audit committee) attendance: - 20. Whether subject to securities registration statement filing: No 21. If exempted from filing, the reason: - 22. Whether the subscription falls within a period when short selling is prohibited: No; Start date -; End date - 23. Whether subject to Fair Trade Commission reporting: Not applicable * Independent director for listed companies; outside director for non-listed companies.

24. Other matters material to investment decisions Since submitting the securities registration statement on April 15, 2026, the company has continuously supplemented the key contents of the registration statement in response to the Financial Supervisory Service's amendment requests, among other matters. However, as the registration statement review and amendment process has continued over an extended period, the fundraising schedule, business implementation timing, the company's fund management conditions, and market conditions have changed compared to when the rights offering was first decided, creating a need to re-examine the existing rights offering plan and overall use-of-proceeds plan. Having comprehensively reviewed the current business environment, financial condition, investment priorities by business, and actual funding needs, the company determined that it would better serve the interests of the company and its shareholders to re-establish its future business and fundraising plans rather than proceed with the existing rights offering plan as is. Accordingly, the company has decided to withdraw its decision to conduct the rights offering via general public subscription for forfeited shares following shareholder allotment, and to withdraw the related securities registration statement. This withdrawal of the rights offering does not mean discontinuation of the company's existing business or new growth businesses; the company will re-examine the scale and method of funding needed, comprehensively considering its future operating cash flow, financial condition, business progress, and market conditions.