SanDisk (NASDAQ:SNDK) and its Japanese partner Kioxia announced they will invest over $31 billion in Japan over six years to expand NAND flash capacity for the AI era, including $11.3 billion for a new facility at Kioxia's Kitakami plant. This expansion is supported by $91 billion in contracted customer demand and $16.5 billion in customer financial guarantees, a strategy aimed at avoiding historical memory market oversupply issues. SanDisk CEO David Goeckeler noted revenue visibility has extended from three months to over four years. SanDisk shares closed at $1,484.98 on Friday, up 525.57% year-to-date. The company also reported Q4 revenue of $8.96 billion, up 371.59% year-over-year, and authorized an additional $14 billion in share buybacks.