Kioxia Shares Lifted by $13 Billion Inflow Hope After JPX Review

Markets Contact us:Provide news feedback or report an error Confidential tip?Send a tip to our reporters Site feedback:Take our Survey By Momoka Yokoyama October 7, 2026 at 9:40 AM UTC Updated on October 8, 2026 at 12:47 AM UTC Kioxia Holdings Corp. ’s shares rose as much as 4% after Japan Exchange Group Inc. announced its weighting on the benchmark Topix index will be increased, a move that fueled expectations that an estimated ¥2 trillion ($12.7 billion) of passive inflows may be triggered. The Japanese memory maker’s free-float weight will rise to 50% from the previous 15% in its regular review, JPX said Wednesday. To mitigate the potential market impact, JPX will gradually reflect the change in two stages by first lifting it to 32.5% on Oct. 30, and then to 50% on Nov. 30.