Material event report (decision to redeem own convertible bonds early)

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What happened

Material Event Report (Decision on Early Acquisition of Self-Convertible Bonds) 6.0

Woosung Materials Co., Ltd. Material Event Report / Exchange Reporting Obligation Financial Services Commission / Korea Exchange

Date: September 17, 2026

Company Name: Woosung Materials Co., Ltd. Representative Director: Lim Jong-chan Head Office Address: 35 Geomdan-dong-ro, Buk-gu, Daegu Metropolitan City Telephone: 053-382-4772 Website: http://www.startex.co.kr

Prepared by: (Position) Department Head (Name) Seo Dae-gyeong (Telephone) 053-382-4772

**Early Acquisition of Self-Convertible Bonds**

1. Type of Bond: Series 8, Bearer-type, Interest-bearing, Unsecured, Private Placement Convertible Bond

2. Bond Issuance Date: March 31, 2025

3. Bond Issuance Method: Private Placement

4. Bond Maturity Date: March 31, 2028

5. Total Face Value (Electronic Registration) of Bond (KRW): 2,500,000,000

6. Face Value (Electronic Registration) of Bond Subject to Acquisition (KRW): 2,500,000,000

7. Acquisition Decision Date: September 17, 2026

8. Acquisition Amount (KRW): 2,621,636,189 Calculation Basis: Principal and Interest Payment (Scheduled) Date: October 19, 2026 Source of Acquisition Funds: Own funds

9. Acquisition Method: Over-the-counter purchase

10. Reason for Early Acquisition: Decision to acquire bonds before maturity by agreement with bondholders

11. Future Handling Plan: To be determined by the Board of Directors at a later date (resale or cancellation)

12. Conversion Details: Conversion Ratio (%): 100 Conversion Price as of Reporting Date (KRW/share): 2,850 Type of Stock to be Issued upon Conversion: Ordinary shares of Woosung Materials Co., Ltd. Number of Shares: 877,192 Ratio to Total Outstanding Shares (%): 5.09 Conversion Request Period: Start Date: March 31, 2026, End Date: February 29, 2028

13. Face Value (Electronic Registration) Balance of Bond After Acquisition (KRW): -

14. Fair Trade Commission Reporting Requirement: Not applicable

15. Other Matters for Reference in Investment Decisions: - The above acquisition decision date is the date of Board of Directors resolution. - The ratio of total shares to be issued upon conversion is calculated based on the current total outstanding shares (17,238,905 shares).

**Seller Information**

Seller Name: Sangsangin Savings Bank Co., Ltd. Relationship with Company or Largest Shareholder: - Selection Process: Bondholder of this bond Transaction Details and Plans within 6 Months Before and After Acquisition Decision: - Face Value of Bond Sold (KRW): 2,500,000,000 Remarks: -