Supply contract signed

What happened

Single Sales/Supply Contract Signed

1. Content of sales/supply contract: Supply contract for 2nd-generation high-temperature superconducting wire

2. Contract details Conditional contract: Not applicable Confirmed contract amount: 662,348,400 Conditional contract amount: - Total contract amount (KRW): 662,348,400 Most recent sales (KRW): 3,386,486,863 Ratio to sales (%): 19.56

3. Counterparty Name: - Most recent sales (KRW): - Main business: - Relationship with the company: - Performance of same type of contract with the company in the last 3 years: Applicable

4. Sales/supply region: United States

5. Contract period Start date: 2026-09-04 End date: 2027-02-10

6. Key contract terms Down payment/advance payment: None Payment terms, etc.: Payment within 30 days of invoice issuance

7. Sales/supply method In-house production: Applicable Outsourced production: Not applicable Other: -

8. Contract (order) date: 2026-09-04

9. Disclosure deferral Deferral deadline: 2027-02-10 Reason for deferral: Confidentiality agreement

10. Other matters for reference in investment decisions 1. The most recent sales figure above is based on the separate (non-consolidated) financial statements as of the end of 2025. 2. The above contract amount is USD 487200.00 (as stated in the filing, without a thousands separator), applying the Seoul Money Brokerage Services exchange rate of KRW 1,359.50/USD quoted on 2026-09-04. 3. The above contract may change in the course of future implementation. 4. The above contract period start date and the contract (order) date are the date the purchase order (PO) was received. 5. The above contract period end date is based on the delivery deadline. 6. Payment is due within 30 days after the company issues its invoice following the counterparty's receipt of goods. 7. The above deferral deadline is based on a confidentiality agreement with the counterparty. Related disclosures: None