[Amended] Supply contract signed

What happened

Amendment Report

Amendment date: 2026-07-06

1. Disclosure document being amended: Single Sale/Supply Contract 2. Date the original disclosure was filed: 2026-05-12 3. Reason for amendment: Correction of disclosed items due to a change in the contract end date, etc. 4. Amended items

Item 5, "Contract period, end date" Before amendment: 2026-07-06 After amendment: 2026-08-06

Item 9, "Matters related to disclosure deferral, deferral period" Before amendment: 2026-07-06 After amendment: 2026-08-06

Related disclosures: 2025-04-24 Single sale/supply contract signed 2025-05-09 Single sale/supply contract signed 2025-07-11 Single sale/supply contract signed 2025-08-22 Single sale/supply contract signed 2026-02-24 Single sale/supply contract signed 2025-04-24 Single sale/supply contract signed 2025-05-09 Single sale/supply contract signed 2025-07-11 Single sale/supply contract signed 2025-08-22 Single sale/supply contract signed 2026-02-24 Single sale/supply contract signed 2026-05-12 Single sale/supply contract signed

- As of the date of this amendment, delivery under this contract has been completed, and the payment collection rate is approximately 96.1%.

Single Sale/Supply Contract

1. Content of the sale/supply contract: Special alloy supply contract

2. Contract details Whether the contract is conditional: Not applicable Confirmed contract amount: 20,319,210,726 Conditional contract amount: - Total contract amount (KRW): 20,319,210,726 Most recent revenue (KRW): 2,557,761,611 As a percentage of revenue (%): 794.41

3. Counterparty: A U.S. global aerospace launch company - Most recent revenue (KRW): - - Principal business: - - Relationship with the Company: - - Whether the Company has performed a similar contract with the counterparty in the past 3 years: Yes

4. Sale/supply region: Overseas

5. Contract period Start date: 2025-04-24 End date: 2026-08-06

6. Key contract terms Whether there is a down payment/advance payment: No Payment terms, etc.: 30 days after product delivery

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

8. Contract (order) date: 2025-04-24

9. Matters related to disclosure deferral Deferral deadline: 2026-08-06 Reason for deferral: At the counterparty's request to keep its trade secrets confidential

10. Other matters for reference in investment decisions - The contract amount in item 2 above is USD 14,283,151.08, converted using the Seoul Money Brokerage Services' quoted base exchange rate of KRW 1,422.60 per USD as of April 23, 2025; customs duties, etc. are excluded. - The most recent revenue in item 2 above is based on the consolidated financial statements for fiscal year 2024. - The counterparty information in item 3 above (the counterparty's company name, most recent revenue, relationship with the Company, and items supplied) has not been disclosed at the counterparty's request to protect its trade secrets. - The end date of the contract period in item 5 above is an estimated end date that takes into account the expected payment schedule after delivery, and will be amended if the schedule changes. - The contract start date in item 5 and the contract (order) date in item 8 above are based on the date the purchase order (P/O) document was received (confirmed). - The above contract terms may change through discussion with the counterparty depending on progress.

Related disclosures: 2025-04-24 Single sale/supply contract signed 2025-05-09 Single sale/supply contract signed 2025-07-11 Single sale/supply contract signed 2025-08-22 Single sale/supply contract signed 2026-02-24 Single sale/supply contract signed 2026-05-12 Single sale/supply contract signed