[Amended] Supply contract signed

What happened

Supply Contract Signed Amendment Report Amendment date: 2026-08-03

1. Disclosure document subject to amendment: Single Sale and Supply Contract Signed 2. Date of submission of the disclosure document subject to amendment: 2026-05-26 3. Reason for amendment: Correction due to a change in the order amount and stated terms 4. Amendment details

Item: 2. Contract details - Conditional contract amount Before amendment: Total contract amount (KRW) 24,986,637,000; Percentage of revenue (%) 977 After amendment: Total contract amount (KRW) 49,051,471,903; Percentage of revenue (%) 1,917.7 (the amendment table itself states this figure as "1917.7" without digit grouping)

Item: 7. Method of sale/supply - Outsourced production Before amendment: Not applicable After amendment: Applicable

Item: 10. Other material matters relevant to investment decisions - The Company submitted a "Single Sale and Supply Contract Signed" disclosure (contract amount KRW 41,624,607,557) to the Financial Supervisory Service's DART system and the Korea Exchange's KIND system on 2026.02.19, and at the unilateral request of the same counterparty, all or part of the order received under this "Single Sale and Supply Contract Signed" of 2025.09.29 (contract amount KRW 24,986,637,000) may be canceled. In that case, please note that the originally disclosed "Single Sale and Supply Contract Signed" of 2025.09.29 may be subject to an "amended disclosure" or a "termination of the single sale and supply contract." - The contract amount in the above "2. Contract details" is USD 17,842,500, converted using the Seoul Money Brokerage Services' quoted base exchange rate of 1,400.40 KRW/USD as of September 26, 2025, and excludes customs duties, etc. (remainder omitted) - The Company has completed delivery of a similar specialty alloy raw material to the counterparty (see the disclosure of 2026.06.12), and accordingly, all or part of this order may be canceled at the unilateral request of the counterparty. In that case, please note that this "Single Sale and Supply Contract Signed" disclosure may be subject to an "amended disclosure" or a "termination of the single sale and supply contract." - The contract amount in the above "2. Contract details" is USD 35,026,758, converted using the Seoul Money Brokerage Services' quoted base exchange rate of 1,400.40 KRW/USD as of September 26, 2025, and excludes customs duties, etc. (remainder omitted)

※ Related disclosures: 2025-09-29 Single Sale and Supply Contract Signed; 2026-02-19 (Amended) Single Sale and Supply Contract Signed; 2026-05-26 (Amended) Single Sale and Supply Contract Signed; 2025-09-29 Single Sale and Supply Contract Signed; 2026-02-19 (Amended) Single Sale and Supply Contract Signed; 2026-05-26 (Amended) Single Sale and Supply Contract Signed; 2026-06-12 (Amended) Single Sale and Supply Contract Signed - As the "Single Sale and Supply Contract Signed" originally disclosed by the Company on 2026.02.19 to the Financial Supervisory Service's DART system and the Korea Exchange's KIND system has now completed delivery (see the disclosure of 2026.06.12; final order amount KRW 43,187,976,305), part of the conditional order details has changed accordingly.

Single Sale and Supply Contract Signed

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

2. Contract details - Whether the contract is conditional: Applicable - Confirmed contract amount: - - Conditional contract amount: 49,051,471,903 - Total contract amount (KRW): 49,051,471,903 - Recent revenue (KRW): 2,557,761,611 - Percentage of revenue (%): 1,917.7

3. Counterparty - Name: A U.S. global aerospace launch company - Recent revenue (KRW): -; Main business: -; Relationship with the Company: - - Whether the Company has performed the same type of contract with the counterparty in the past 3 years: Applicable

4. Sale/supply region: Overseas

5. Contract period: Start date 2025-09-27; End date 2027-02-05

6. Key contract terms - Whether there is a down payment/advance payment: No - Payment terms, etc.: 30 days from invoice date

7. Method of sale/supply - In-house production: Not applicable - Outsourced production: Applicable - Other: -

8. Contract (order) date: 2025-09-27

9. Matters concerning withholding of disclosure - Withholding deadline: 2027-02-05 - Reason for withholding: The counterparty's request not to disclose trade secrets

10. Other material matters relevant to investment decisions - The Company has completed delivery of a similar specialty alloy raw material to the counterparty (see the disclosure of 2026.06.12), and accordingly, all or part of this order may be canceled at the unilateral request of the counterparty. In that case, please note that this "Single Sale and Supply Contract Signed" disclosure may be subject to an "amended disclosure" or a "termination of the single sale and supply contract." - The contract amount in the above "2. Contract details" is USD 35,026,758, converted using the Seoul Money Brokerage Services' quoted base exchange rate of 1,400.40 KRW/USD as of September 26, 2025, and excludes customs duties, etc. - The recent revenue in the above "2. Contract details" is based on revenue under the consolidated financial statements for fiscal year 2024. - The counterparty information in the above "3. Counterparty" (the counterparty's company name, recent revenue, relationship with the Company, and items supplied) is not stated at the counterparty's request to protect its trade secrets. - The end date of the contract period in the above "5." is the expected end date considering the expected schedule for receiving payment after delivery, and will be subject to amended disclosure if the schedule changes. - The start date of the contract period in the above "5." and the contract (order) date in "8." are based on the date the purchase order document was received (confirmed). - The above contract terms may change through consultation with the counterparty as the matter proceeds.

※ Related disclosures: 2025-09-29 Single Sale and Supply Contract Signed; 2026-02-19 Single Sale and Supply Contract Signed; 2026-05-26 Single Sale and Supply Contract Signed; 2026-06-12 Single Sale and Supply Contract Signed