U.S. memory chip stocks fell sharply in pre-market trading on October 15, with SK Hynix leading the decline at over 7.8%. The broader sector experienced significant selling pressure as major manufacturers saw shares drop more than 5%. Western Digital, Seagate Technology, SanDisk, and Micron Technology all recorded losses exceeding 5% during the session. The synchronized downturn affected key players across the memory semiconductor industry before the market open.