Change of largest shareholder

What happened

Sambu Construction / Change of Largest Shareholder / (2026.07.14) Change of Largest Shareholder

Change of Largest Shareholder

1. Details of the change Largest shareholder before change: Korea Asset Trust Co., Ltd.; Shares held: 1,213,118; Ownership ratio: 3.10% Largest shareholder after change: Rebuild Sambu Holdings Co., Ltd.; Shares held: 33,000,000; Ownership ratio: 84.24%

2. Reason for the change: Change of largest shareholder due to a third-party-allotment rights offering under the rehabilitation plan

3. Purpose of the equity acquisition: Participation in management - Method of funding the acquisition: Investment by Rebuild No.1 Corporate Financial Stability Private Investment Limited Partnership - Plans to appoint/dismiss officers after the acquisition: -

4. Date of change: 2026-07-14 5. Date change was confirmed: 2026-07-14

6. Other material matters relevant to investment decisions 1. The pre-change and post-change ownership ratios in Item 1 above are based on the total issued shares after the existing shareholders' capital reduction, debt-to-equity conversion, overall capital reduction, and the rights offering to the new largest shareholder, all under the approved rehabilitation plan. 2. The post-change largest shareholder and its post-change ownership ratio in Item 1 above may change if fractional shares are later cancelled with court approval. 3. The "date of change" and "date change was confirmed" in Item 4/5 above are the effective date of the rights offering.

Related disclosures: 2026-06-26 Approval of Rehabilitation Plan; 2026-06-26 Capital Reduction Decision; 2026-06-26 Rights Offering Decision; 2026-06-26 Capital Reduction Decision; 2026-06-26 Rights Offering Decision; 2026-07-06 Report of Change in Largest Shareholder's Holdings (upon change of largest shareholder); 2026-07-06 Change of Largest Shareholder

Detailed Change in Holdings Name (corporation) / Relationship / Before change / After change / Note Shares / Ownership ratio(%) Korea Asset Trust Co., Ltd.: Largest shareholder before change; 24,262,365 / 19.64 -> 1,213,118 / 3.10; Share count after debt-to-equity conversion and re-consolidation of shares Rebuild Sambu Holdings Co., Ltd.: Largest shareholder before change (as stated in the filing; based on the figures shown, this appears to in fact be the largest shareholder after the change); - / - -> 33,000,000 / 84.24; Subject to a one-year lock-up from the effective date