[Amended] Material event report (equity acquisition)

What happened

Material Event Report (Decision to Acquire Shares and Equity Securities of Another Company) Woosung Materials Co., Ltd.

Amendment Report, September 30, 2026 1. Disclosure document being amended: Material Event Report (Decision to Acquire Shares and Equity Securities of Another Company) 2. Original submission date of the disclosure document: February 6, 2026 3. Amended items

Item: 7. Payment of transaction price Reason for amendment: Change in final payment date Before: Final payment: KRW 4,900,000,000 (KRW 4.9 billion in cash) on September 30, 2026 After: Final payment: KRW 4,900,000,000 (KRW 4.9 billion in cash) on December 30, 2026

Item: 15. Other matters material to investment decisions, 7) Reason for change in final payment date for equity transfer Before: The company has continued to review the relevant contract and transaction schedule in the course of conducting the equity transfer transaction with the prospective payer. However, as the major contracts and transaction schedules the company is pursuing have been delayed beyond initial expectations, the prospective payer's investment schedule and fund execution plan were adjusted, and accordingly the company and the prospective payer mutually agreed to change the final payment date. After: A situation arose requiring additional confirmation and review of matters related to this transaction, and after explaining the need to change the final payment date, the company consulted with the seller, Dongyang Ink Co., Ltd., and decided to change the final payment date.

Material Event Report / Korea Exchange Reporting Obligation To the Financial Services Commission / Korea Exchange September 30, 2026

Company name: Woosung Materials Co., Ltd. CEO: Im Jong-chan Head office: 35 Geomdan-dongro, Buk-gu, Daegu Tel: 053-382-4772 Website: http://www.startex.co.kr Preparer: Division Head Seo Dae-kyung, Tel 053-382-4772

Decision to Acquire Shares and Equity Securities of Another Company

1. Issuing company Company name: Jinan Crown Ink Co., Ltd. Nationality: China Representative: Choi Ji-won Capital stock (KRW): 11,859,210,000 Relationship with the company: - Total shares issued: - Main business: Manufacture and sale of offset printing ink, resin, and varnish New share acquisition via third-party allotment within the last 6 months: No

2. Acquisition details Number of shares acquired: - Acquisition amount (KRW) (A): 11,900,000,000 Total assets (KRW) (B): 116,893,023,052 Acquisition amount as % of total assets (A/B): 10.18 Equity capital (KRW) (C): 31,095,762,234 Acquisition amount as % of equity capital (A/C): 38.27

3. Shares owned and equity ratio after acquisition Shares owned: - Equity ratio (%): 100

4. Purpose of acquisition Securing a mid- to long-term growth foundation by establishing an offset ink manufacturing base in China, expanding the global supply chain for the printing and packaging materials business, and diversifying the business.

5. Expected acquisition date: -

6. Counterparty Company name: Dongyang Ink Co., Ltd. Capital stock (KRW): 3,327,000,000 Main business: Manufacture of printing ink Head office address: 94 Gagok 4-gil, Jinwi-myeon, Pyeongtaek-si, Gyeonggi-do Relationship with the company: -

7. Payment of transaction price a. Payment method and timing: Down payment of KRW 2,000,000,000 paid on February 6, 2026 (KRW 1.0 billion cash + KRW 1.0 billion convertible bonds), with Woosung Materials' own 6th-series convertible bonds worth KRW 1.0 billion paid in kind; Interim payment of KRW 5,000,000,000 paid on April 9, 2026 (convertible bonds), with the company's own 5th-series convertible bonds worth KRW 5.0 billion paid in kind; Final payment of KRW 4,900,000,000 paid on December 30, 2026 (KRW 4.9 billion cash). b. Funding method: Own funds, and utilization of convertible bonds previously issued and subsequently reacquired by the company.

8. External valuation matters External valuation conducted: Yes Basis and reason: 1. Basis: For use as an attachment to the material event report submitted to the Financial Services Commission pursuant to Article 161 of the Financial Investment Services and Capital Markets Act and Article 171 of its Enforcement Decree. 2. Reason: Presented as reference material for the company's internal decision-making on the share acquisition transaction, and used in preparing and attaching to the material event report submitted under the Financial Investment Services and Capital Markets Act. Name of external valuation institution: Hanwool Accounting Corporation External valuation period: December 19, 2025 - February 6, 2026 External valuation opinion: The value range for 100% of the target company's equity is KRW 11.269 billion to KRW 13.340 billion, and the actual acquisition price of KRW 11.9 billion is considered reasonable from a materiality standpoint.

9. Board resolution date (decision date): 2026.02.06 Independent (outside) director attendance: Present (persons) 1; Absent (persons) 1 Auditor (audit committee member who is not an independent (outside) director) attendance: Present

10. Whether this constitutes a backdoor listing: No Plans for third-party allotment capital increase, etc. within the next 6 months: Yes

11. Whether the issuing company (other company) meets backdoor listing requirements: No

12. Whether subject to Fair Trade Commission reporting: Not applicable

13. Whether a put option or similar contract has been concluded: No Contract details: - * Independent director for listed companies; outside director for non-listed companies.

14. Future plans for corporate restructuring As of the date of this report, the company has not decided on any specific restructuring plans. Future related matters will be disclosed as they arise.

15. Other matters material to investment decisions 1) This transaction involves the acquisition of 100% of the equity interest in a Chinese limited liability company; since the target company has an equity-interest structure rather than a share-issuance structure, the concepts of total shares issued and number of shares acquired do not apply. The equity ratio in this disclosure is based on equity interest. 2) The "capital stock" in "1. Issuing company" above is as of the disclosure submission date, converted from USD 8.1 million at the exchange rate as of the contract date. 3) The total assets and equity capital in "2. Acquisition details" above are stated based on the consolidated financial statements as of the end of the most recent fiscal year (December 31, 2024). 4) The following "Summary Financial Status of the Issuing Company" is based on the external valuation institution's opinion for the current year (2024), prior year (2023), and the year before that (2022), with CNY amounts converted using the official exchange rate as of the end of September 2025. 5) For other details, please refer to the attached "External Valuation Institution's Opinion." 6) This transaction is conditioned on the fulfillment of contractual conditions precedent, full payment of the transfer price, and completion of the business registration change with the Chinese State Administration for Market Regulation; legal ownership transfers upon completion of such registration, and the conditions and schedule may change by agreement between the parties or under local laws and administrative procedures, in which case the matter will be re-disclosed. Related disclosures: Not applicable. 7) Reason for change in final payment date for equity transfer transaction: A situation arose requiring additional confirmation and review of matters related to this transaction, and after explaining the need to change the final payment date, the company consulted with the seller, Dongyang Ink Co., Ltd., and decided to change the final payment date.

[Summary Financial Status of the Issuing Company] (Unit: KRW million) Current year: Total assets 16,835; Total liabilities 2,920; Total equity 13,915; Capital stock 11,799; Revenue 14,639; Net income 742; Audit opinion -; External auditor - Prior year: Total assets 15,851; Total liabilities 2,679; Total equity 13,172; Capital stock 11,799; Revenue 13,036; Net income 349; Audit opinion -; External auditor - Year before that: Total assets 17,678; Total liabilities 4,854; Total equity 12,824; Capital stock 11,799; Revenue 12,951; Net income -1,181; Audit opinion -; External auditor -