SK Square filed this as a material decision of its subsidiary. SK hynix's board resolved on August 19 to buy 24,070,000 of its own shares between August 20 and November 19, an estimated ₩40.0tn using the ₩1,662,000 close on August 18. That is 3.3% of SK hynix's 730.5m shares, about 3.2% of its ₩1,236.7tn market capitalisation, and roughly 93% of its FY2025 net income of ₩42.95tn. The stated purpose is raising shareholder value through cancellation, and a separate share-cancellation decision was filed the same day, so these shares are not going into treasury to sit there. For SK Square, whose ₩140.8tn market value rests mainly on its SK hynix holding, the mechanical consequence is that its percentage stake in SK hynix rises without it spending anything. The share count is an estimate and will move with the price.