Memory chip stocks are trading lower in the pre-market session, with the sector benchmark down over 3%. The negative sentiment is primarily driven by news from a major industry player, SK Hynix, whose shares fell significantly in Seoul. This drop is attributed to reports that its U.S. subsidiary, Solidigm, is considering an IPO, which has raised concerns among investors about the company's ownership structure. Adding to the pressure are reports of a potential pause in advanced AI model development at OpenAI, sparking fears of a slowdown in demand for high-bandwidth memory (HBM) chips used in AI infrastructure. News of China potentially allowing some domestic firms to purchase advanced NVIDIA chips has also contributed to concerns about increased competition.