Sandisk is trading 3.3% down now at $1,510.11 after concerns about rising memory-chip competition weighed on the sector. - Reports say China’s CXMT has advanced a denser next-generation DRAM design and plans new DDR5 server-memory products, prompting investors to reassess competitive and pricing pressure across memory makers. - Other memory stocks also fell, supporting a sector-wide explanation; no company-specific news explaining Sandisk’s decline was identified.