[Amended] Supply contract signed

What happened

Philenergy / Single Sales/Supply Contract Signed / (2026.08.31) Single Sales/Supply Contract Signed Amendment Report Amendment date: 2026-08-31

1. Disclosure document being amended: Single Sales/Supply Contract Signed 2. Filing date of the disclosure document being amended: March 19, 2024 3. Reason for amendment: Extension of the contract end date and the confidentiality deferral deadline by agreement with the counterparty

4. Amended items Amendment item: "5. Contract period - End date" Before amendment: 2026-08-31 After amendment: 2027-03-31

Amendment item: "9. Matters concerning confidentiality deferral - Deferral deadline" Before amendment: 2026-08-31 After amendment: 2027-03-31

* As of the date of this amendment (2026.08.31), 90% of the contract amount has been received (90% performance rate); the remaining performance will be completed when the remaining progress payments for the delivered equipment and the final payment upon completion of setup are received. The above contract end date may be further changed by agreement between the two parties.

Single Sales/Supply Contract Signed

1. Details of the sales/supply contract: -

2. Contract details Whether the contract is conditional: Not applicable Confirmed contract amount: 99,810,000,000 Conditional contract amount: - Total contract amount (KRW): 99,810,000,000 Most recent revenue (KRW): 196,715,168,088 Ratio to revenue (%): 50.74

3. Counterparty - / Most recent revenue (KRW) - / Main business - / Relationship with the Company - / Whether the counterparty performed the same type of contract with the Company in the most recent 3 years: Yes

4. Sales/supply region: -

5. Contract period Start date: 2024-03-18 End date: 2027-03-31

6. Key contract terms Whether there is a down payment/advance payment: No Payment terms, etc.: Progress payment 90%; Final payment 10%

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

8. Contract (order) date: 2024-03-18

9. Matters concerning confidentiality deferral Deferral deadline: 2027-03-31 Reason for deferral: At the counterparty's request to protect its trade secrets

10. Other matters for reference in investment decisions - The most recent revenue figure is consolidated revenue for fiscal year 2023. - The above contract amount excludes value-added tax. - The contract date is the date the Company received the document from the customer. - The sales/supply contract details, counterparty, and sales/supply region have not been disclosed at the counterparty's request to protect its trade secrets. * Related disclosures: Not applicable.