Kioxia (TYO) delivered a blockbuster fourth-quarter outlook, sending memory chip stocks soaring on Tuesday. The flash memory supplier projected revenue of ¥890 billion for Q4, far exceeding the consensus estimate of ¥648 billion, while adjusted net income is seen at ¥340 billion versus ¥164 billion. This robust guidance, coupled with Micron's upbeat comments on demand, underscores persistent supply constraints in the NAND flash market.

Kioxia also confirmed its entire 2026 NAND production capacity is sold out, highlighting tight industry conditions. The rally extended across the sector, with Micron jumping 9.9% and SanDisk up 10.7% premarket. Micron CFO Mark Murphy emphasized strong demand, describing the company's trajectory as "extraordinary" and noting shipments of its new HBM4 memory product are "ramping successfully".