Change of largest shareholder

What happened

Duoback / Change of largest shareholder / (2026.08.19) Change of largest shareholder

Change of largest shareholder 1. Details of change Pre-change largest shareholder, etc.: Chung Kwan-young and 5 others; Shares held (shares): 5,278,486; Ownership ratio (%): 44.10 Post-change largest shareholder, etc.: -; Shares held (shares): -; Ownership ratio (%): -

2. Reason for change: Commencement of inheritance proceedings following the death of the largest shareholder - Change due to acquisition of forfeited shares: No - Mandatory holding period for the transferred shares: No

3. Purpose of equity acquisition: - - Funding source: own funds (KRW) -; borrowed funds (KRW) -; lender -; borrowing period - to -; collateral details - - Plan for appointment/dismissal of officers after acquisition: -

4. Date of change: - 5. Date change confirmed: - 6. Other matters for investment reference: An amended disclosure is planned once the inheritance is finalized. ※ Related disclosure: -

[Details of change] Name | Relationship | Before: shares/ratio | After: shares/ratio | Note Chung Kwan-young: Pre-change largest shareholder; Before: 4,351,102 shares / 36.36%; After: - / -; -