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

What happened

Material Event Report / Korea Exchange Reporting Matter To the Financial Services Commission / Korea Exchange July 6, 2026

Company name: CU Medical Systems Co., Ltd. Representative Director: Kim Hyung-su Head office address: 130-1 Donghwagongdan-ro, Mungmak-eup, Wonju-si, Gangwon-do (Phone) 033-747-7657 (Website) http://www.cu911.com Preparer: (Title) Executive Vice President (Name) Lee Min-seok (Phone) 033-747-7657

Decision to Redeem Own Convertible Bonds Before Maturity

1. Type of bonds: Series 11, convertible bonds 2. Bond issue date: 2026-03-18 3. Bond issuance method: Private placement 4. Bond maturity date: 2029-03-30 5. Total face value (electronically registered) of the bonds (KRW): 7,000,000,000 6. Face value (electronically registered) of the bonds to be acquired (KRW): 2,000,000,000 7. Date of the acquisition decision: 2026-07-06 8. Acquisition amount Amount (KRW): 2,071,094,723 Basis for calculation: principal plus interest (Expected) date of payment of principal and interest: 2026-07-06 Source of acquisition funds: Own funds 9. Method of acquisition: Over-the-counter purchase 10. Reason for acquisition before maturity: Exercise of the early-redemption (call) option 11. Future handling plan: Retirement through a future board resolution after acquisition 12. Matters concerning conversion Conversion ratio (%): 100 Conversion price as of the reporting date (KRW/share): 2,665 Type of shares to be issued upon conversion: CU Medical Systems Co., Ltd. registered common shares Number of shares: 750,469 As a percentage of total shares issued (%): 6.19 Conversion request period: start date 2027-03-30, end date 2029-02-28 13. Face value (electronically registered) of the bonds remaining after acquisition (KRW): 5,000,000,000 14. Whether subject to Fair Trade Commission reporting: Not applicable 15. Other matters for reference in investment decisions - The "amount" in item 8 above was calculated by applying the contractual yield of 103.6% under the call-option agreement to the bonds' face value. - The "conversion ratio" and "shares to be issued upon conversion" in item 12 above assume that the convertible bonds being acquired in this transaction are converted. The Company completed a par-value share consolidation on May 20, 2026 (par value KRW 500 to KRW 2,500), and accordingly, under the conversion-price adjustment clause (Article 9(b)) of the March 17, 2026 disclosure on the decision to issue these convertible bonds, the original conversion price of KRW 533 was adjusted to KRW 2,665. The conversion price as of the reporting date and the number of shares to be issued upon conversion in item 12 above are calculated using this adjusted conversion price (KRW 2,665 per share).

[Matters Concerning the Sellers] Seller: Sangsangin Savings Bank Co., Ltd.; relationship to the Company or largest shareholder: -; capacity: bondholder; selection process: -; dealings and plans within 6 months before/after the acquisition decision: -; face value of bonds sold (KRW): 1,000,000,000; remarks: - Seller: Sangsangin Plus Savings Bank Co., Ltd.; relationship: -; capacity: bondholder; selection process: -; dealings and plans: -; face value of bonds sold (KRW): 500,000,000; remarks: - Seller: Raon Savings Bank Co., Ltd.; relationship: -; capacity: bondholder; selection process: -; dealings and plans: -; face value of bonds sold (KRW): 500,000,000; remarks: - Total: face value of bonds sold (KRW): 2,000,000,000