Why is Kioxia stock surging today?

Kioxia Holdings Corp.'s stock rose by 13.0% to ¥14,240 on Wednesday, mirroring the gains of memory chip company SK Hynix. This surge was triggered by SK Hynix's impressive third-quarter earnings, which exceeded expectations. The company's forecast of a tight memory supply, a scenario that has driven up prices in the sector over the past year, further fueled the rally.

Investors are also positioning ahead of Kioxia's upcoming first-half fiscal 2026 earnings release on October 30. Moreover, the stock's increased weightage in the TOPIX index is anticipated to attract further buying in the coming days. The Japanese market as a whole was driven by strong performances in the chips and tech sectors, with the Nikkei 225 increasing by 1.3%. However, the TOPIX remained unchanged for the day.