SK Hynix is trading 3.3% down now at $175.47 after investors reacted to DeepSeek's V4.1 Flash model, which reportedly requires one-quarter as much HBM and one-eighth as much SSD storage as its predecessor.
- DeepSeek began routing V4-Pro requests to the cheaper model on September 14, 2026.
- Memory stocks are under pressure as investors reassess aggressive AI infrastructure-demand expectations; the provided sector benchmark is down 7.35%, while major U.S. indexes are also lower.