SK Hynix is trading 8.55% down at €1070 after DeepSeek’s V4.1 Flash reportedly used substantially less high-bandwidth memory.

  • DeepSeek plans to route inference tasks from V4-Pro to the cheaper Flash model starting September 14, raising concerns about future HBM demand and semiconductor profitability.
  • Reports directly linked the prior September 11 selloff in South Korean memory stocks to these concerns.
  • Higher oil prices, yields, and weaker technology futures added to the broader overnight risk-off backdrop; DeepSeek remains the clearest catalyst.