Shares of Kioxia Holdings Corporation (TYO:285A) rallied sharply on Monday, climbing 7.88% to ¥58,750 by 12:57 p.m. JST, buoyed by a surge in U.S. memory-chip stocks and fresh industry data showing record semiconductor equipment spending. The stock touched a session high of ¥59,200 and a low of ¥57,650, with the afternoon session still underway.
The gains came despite no new company-specific announcements. Kioxia's official disclosure list showed no filings by 1:10 p.m. JST, suggesting the move was driven by external factors. Japanese market participants pointed to Friday's strong performance on the PHLX Semiconductor Sector Index, which closed up 3.37% at 11,735.26, and to new data from SEMI indicating a second consecutive quarter of record global chip-equipment billings.
Micron Technology (NASDAQ:MU) advanced 6.10% to $1,016.59, while SanDisk Corporation (NASDAQ:SNDK), Kioxia's manufacturing partner, jumped 11.90% to $1,740. These U.S. gains provided a clear handoff for Tokyo-listed shares, reinforcing optimism about the NAND flash market.
Strong earnings momentum
Kioxia's recent quarterly results have already demonstrated robust demand for NAND flash, particularly from generative-AI data centers. In the June quarter, revenue reached ¥1.767 trillion, with SSD and storage revenue contributing ¥1.175 trillion, up ¥574.4 billion from the March quarter. Operating profit surged to ¥1.270 trillion, driven by higher selling prices.
The company's September-quarter forecast points to revenue of ¥2.390 trillion and operating profit of ¥1.890 trillion, implying sequential increases of 35.2% and 48.8%, respectively. These projections hinge on sustained strength in data-center demand, which market observers will closely monitor.
Adding basic earnings per share of ¥1,539.91 to Kioxia's September-quarter outlook of ¥2,317.46 yields a first-half EPS of ¥3,857.37, measured before the October 1 three-for-one stock split. Monday's price equates to 15.2 times that six-month figure, or a 7.6 times run-rate multiple when annualized.
Valuation caveats and supply concerns
While the multiple appears low, caution is warranted. Kioxia has not provided full-year guidance due to the volatile nature of memory markets. Additionally, the stock remains 47.9% below its June 22 intraday high of ¥112,700, indicating that Monday's bounce only partially repairs lost investor confidence.
Supply dynamics could also turn against shareholders. SEMI reported $40.53 billion in global chip-equipment billings for the June quarter, up 23% year-over-year and 11% sequentially. While this confirms robust investment in AI capacity, it also signals potential future increases in bit supply, which could pressure NAND selling prices over time.
Kioxia and SanDisk have already outlined ambitious expansion plans. On August 27, they announced a joint investment of approximately ¥5 trillion ($31 billion) in Japanese facilities through 2032, subject to government support. Site work for Kitakami Fab3 has begun, with operations targeted for fiscal 2029, though equipment decisions will depend on market conditions.
Outlook hinges on September-quarter results
The September-quarter report will be the crucial test. If Kioxia delivers revenue near ¥2.390 trillion and operating profit near ¥1.890 trillion, Monday's repricing will be validated. Conversely, any miss on average selling prices could challenge the current valuation.
The October 1 stock split will alter per-share arithmetic but does not change the company's intrinsic value. Until Kioxia reports, the sector's momentum and spending data provide the primary catalysts. The stock's sharp rebound underscores the market's renewed appetite for NAND exposure, but investors should remain mindful of the cyclical and supply-side risks that lie ahead.
