Kioxia Holdings’ Market Cap Surpasses Toyota to Top Japan Stock Market for First Time
English summary
On June 12, 2026, Kioxia Holdings’ total market capitalization reached 44 trillion yen, surpassing Toyota’s approximately 43 trillion yen to claim the top spot among Japanese listed companies for the first time. The rally was driven by expanding sales of NAND flash memory, fueled by massive AI data center investments from U.S. technology giants. SoftBank Group had briefly overtaken Toyota on June 1, lifted by valuation gains from its stake in OpenAI and its Arm Holdings unit. Kioxia’s ascent highlights the growing economic weight of memory semiconductors in the AI infrastructure boom.
Chinese summary
2026年6月12日，铠侠控股总市值达到44万亿日元，超过丰田的约43万亿日元，首次跃居日本国内上市公司市值榜首。股价上涨源自盈利能力扩大，在美国科技巨头对AI数据中心的投资背景下，NAND闪存销售大幅增长。软银集团也曾于6月1日因持有的OpenAI股权和ARM控股估值提升，市值一度超越丰田。铠侠的跃升凸显了存储半导体在AI基础设施热潮中日益增长的经济分量。
Key points
Kioxia Holdings’ market cap reached 44 trillion yen on June 12, 2026, exceeding Toyota’s 43 trillion yen to become Japan’s most valuable listed company for the first time.
2026年6月12日，铠侠控股总市值达到44万亿日元，超过丰田的43万亿日元，首次成为日本市值最高的上市公司。
The surge was powered by a strong increase in NAND flash memory sales, driven by U.S. tech giants’ massive investments in AI data centers.
市值飙升由NAND闪存销售强劲增长推动，这得益于美国科技巨头对AI数据中心的大规模投资。
SoftBank Group briefly claimed the top spot on June 1 due to AI-related valuation rises in its OpenAI stake and Arm Holdings.
软银集团曾于6月1日因持有OpenAI股权和Arm控股的AI相关估值上涨，市值一度登顶。