SK hynix Q3 operating profit surges 632% YoY, margins hit record 80%

SK hynix Q3 operating profit surged 632% YoY to a record, with operating margins at 80%. The stock rose 11%. HBM demand is more than double supply, with output committed through 2029 and supply constraints through 2030. The company signed long-term agreements with 14 customers covering over 50% of 2027-2028 capacity and plans $75 billion in shareholder returns. HBM4 is expected to lead shipments in Q4.