Sandisk is trading at $1,419.69, up 5.64% on October 21, 2026, amid a broader memory-sector rebound supported by reports of NAND upgrades in China. - Reuters reported that Samsung and SK Hynix are upgrading China facilities to make more advanced NAND, targeting AI demand and competition. The news supports the sector, not Sandisk specifically. - Memory chips rose 3.29% during the regular session. No Sandisk-specific catalyst or trading-volume figure is available.