[Amended] Supply contract signed

What happened

IS Dongseo / Single sale and supply contract signed / (2026.07.29) Single sale and supply contract signed, Amendment report Amendment date: 2026-07-29

1. Disclosure document being amended: Single sale and supply contract signed 2. Filing date of the disclosure document being amended: 2025-02-14 3. Reason for amendment: Change in contract period following issuance of the construction commencement report certificate 4. Amended items

Amended item: 5. Contract period - start date Before amendment: - After amendment: 2026-08-01

Amended item: 5. Contract period - end date Before amendment: - After amendment: 2029-10-31

- Single sale and supply contract signed

1. Sale/supply contract category: Construction order - Name of contract signed: Nam-gu B-14 district housing redevelopment improvement project

2. Contract details Contract amount (KRW): 450,208,827,000 Recent sales (KRW): 964,111,879,557 Ratio to sales (%): 46.7 Whether a large corporation: Applicable

3. Counterparty: Nam-gu B-14 District Housing Redevelopment Improvement Project Association - Relationship with the company: -

4. Sale/supply region: Around 350-5 Yaeum-dong, Nam-gu, Ulsan Metropolitan City

5. Contract period Start date: 2026-08-01 End date: 2029-10-31

6. Key contract terms Down payment/advance payment: None Payment terms, etc.: -

7. Contract (order) date: 2020-09-24

8. Non-disclosure item Reason for non-disclosure: - Non-disclosure deadline: -

9. Other matters for reference in investment decisions - The "2. Contract amount (KRW)" above excludes VAT. - The "2. Recent sales (KRW)" above is based on the consolidated financial statements as of the end of 2019. - The "5. Contract period" above is the construction period, 39 months from the actual commencement date. - The "7. Contract (order) date" above is the date the construction contract was signed. - The contract period, contract amount, and other terms may change depending on the progress of the project or the conditions set out in the contract.

* Construction overview: 2 basement floors / 30 above-ground floors, 13 apartment buildings, 1,521 households, and ancillary welfare facilities

* Related disclosures 2020-09-24 Single sale and supply contract signed 2025-02-14 Single sale and supply contract signed