Kioxia Faces Twin Test: Shrinking Index Demand and a NAND Price Squeeze

Kioxia investors are confronting two separate questions that happen to land at the same time. One is mechanical: how much passive buying will the upcoming TOPIX reweighting actually generate? The other is fundamental: can the memory maker hold its guidance together as the rally in NAND prices loses steam? Neither answer is settled, and the two together frame the stock's near-term risk.

On the index side, the expected tailwind has shrunk dramatically. Japanese business daily Nikkei reported today that passive investors may buy roughly ¥470 billion of Kioxia shares at the end of November — down from an earlier expectation of about ¥1 trillion. The revision stems from the lower share price, which reduces the buying demand of institutions that track the index passively. The reweighting remains a fixed calendar event, but the scale of the support it offers is now less than half of what had been hoped.

That matters for anyone who had been counting on index-driven demand to underpin the stock. The Nikkei figure is itself an estimate and depends on how the reweighting plays out. If passive managers execute the adjustments as anticipated, the buying could cushion the shares; if the final number lands closer to the reduced estimate, expectations for that particular catalyst need to come down accordingly.

Guidance Holds Flat as Price Momentum Fades

The operating picture is mixed. According to media reports, second-quarter figures for fiscal 2026 met market expectations, with higher average selling prices lifting operating profit. An unfavorable segment mix, however, capped the upside. On October 30, Kioxia guided for revenue of ¥2,500.0 billion and adjusted non-GAAP operating profit of ¥2,000.0 billion for the October-to-December 2026 quarter — both broadly flat versus the prior quarter. Management expects largely stagnant growth in the third quarter, while longer-term customer agreements improve planning visibility.

The catch is that NAND price increases are losing momentum just as the company leans on stability. Whether Kioxia can deliver the guided figures against that decelerating backdrop is the crux of the bull case. A company merely holding steady offers little operating acceleration for optimists to latch onto; a miss would call the durability of the outlook into question. Additional support for the bullish view would require NAND pricing to improve again.

Bernstein Keeps Its Sell Call

Sell-side opinion is split. Bernstein analyst Stacy Rasgon reaffirmed a sell rating on November 4 with a price target of ¥49,000, setting up a clear contrast with more optimistic coverage. The stock fell 4.3% on the day.

The bear case gains traction if fading price momentum hits the business harder than guidance assumes. Until then, the bull thesis rests on a checkable operating condition: delivery of the stable results Kioxia has promised. The December quarter is the next concrete proving ground, and investors will be watching whether revenue and adjusted operating profit confirm the guided stability — the outcome that will decide which side of the analyst divide carries more weight.