Largest shareholder Kim Deok-jun's stake increases by 0.01% via special relation Lee Soon-chang's open market purchase of 330 shares

Lee Soon-chang, a special relation of largest shareholder Kim Deok-jun, acquired 330 common shares of GST via open market purchase on May 15, 2026, at an average price of KRW 58,900 (funded by personal funds of KRW 19,437,000)
Total shares held by Kim Deok-jun and his six special relations increased to 4,273,180 shares (4,123,180 voting shares), raising the stake from 23.18% to 23.19%, an increase of 0.01%p
Purpose of holding is to exercise influence over management as the largest shareholder (no specific plans); reason for report is change in special relations and share count

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