Tokyo Chip Stocks Caught in Seoul's Regulatory Crosshairs as Kioxia Sheds a Third of Its Value
Published on 07/26/2026 at 17:04 | Redaktion boerse-global.de
The memory chip sector's vertiginous summer took another sharp turn on Friday, with Kioxia shares plunging 12.24 percent to €294.00 — a fresh low that brings the Japanese NAND flash specialist's 30-day losses to nearly 40 percent. The selloff comes just days before the company is scheduled to report first-quarter results, piling pressure on management to reassure investors that fundamentals remain intact despite the market turmoil.
What began as an optimistic session on Thursday, fueled by Alphabet's commitment to ramp up AI infrastructure spending, quickly soured into a regional rout. Samsung Electronics and SK Hynix had jumped 3.65 percent and 4.86 percent respectively on the Seoul bourse after the Google parent's announcement, and Japanese semiconductor names opened Friday in positive territory. But the mood reversed sharply when two catalysts converged: a disappointing forecast from chip-equipment maker Disco, and a regulatory bombshell from South Korea's Financial Services Commission.
The FSC's decision to tighten rules on leveraged ETFs — raising the minimum deposit for retail investors from roughly €7,000 to €21,000 — sent shockwaves through a sector already on edge. Kioxia, with its annualized 30-day volatility of 164 percent, has been a favored target for such leveraged strategies. The resulting wave of position unwinding cascaded across Tokyo's semiconductor complex, dragging the Nikkei 225 down 2.73 percent to 64,611 points.
The regulatory shift in Seoul reflects a deeper structural concern. The combined weighting of Samsung Electronics and SK Hynix in the KOSPI has ballooned from 34 percent at the end of 2025 to 52 percent by mid-July, concentrating market risk in a way that has caught regulators' attention. Both stocks slumped on the news, taking the broader chip sector with them.
Should investors sell immediately? Or is it worth buying Kioxia?
Adding to Kioxia's specific woes, Toshiba disclosed on July 23 that it had trimmed its stake from 16.10 percent to 15.10 percent through market sales between June 22 and July 15. The reduction follows Bain Capital's complete exit earlier this month — a departure that would normally remove an overhang from the stock, but the effect has been neutralized by Toshiba's continued selling. Meanwhile, SK Hynix has been quietly building its position through an investment vehicle, now holding 14 percent and ranking as the second-largest shareholder.
The technical picture offers little comfort. Kioxia's 14-day relative strength index stands at 39.7, flirting with oversold territory, while the stock trades nearly 29 percent below its 50-day moving average of €411.61. The gap between current levels and the June 22 record high of €621.00 — a drop of more than 52 percent — underscores how dramatically sentiment has shifted since the company briefly overtook Toyota as Japan's most valuable corporation.
Yet analysts remain broadly constructive, arguing that the selloff reflects cyclical dynamics rather than structural deterioration. Daiwa's chief strategist Yugo Tsuboi points to the industry's familiar susceptibility to the silicon cycle, noting that supply-demand dynamics in the memory market are expected to normalize over the medium term. Average price targets still sit well above current levels, supported by expectations that NAND flash demand from data centers will remain robust.
Kioxia at a turning point? This analysis reveals what investors need to know now.
The immediate focus now shifts to July 31, when Kioxia is set to report first-quarter results for fiscal 2026 at 3:30 p.m. local time. Market participants are looking for a doubling of quarterly profit versus the prior period, driven by strong demand for high-performance SSDs and NAND flash used in AI infrastructure. With the stock trading at a market capitalization of roughly €167 billion and volatility at extreme levels, the earnings release will likely determine whether the stock stabilizes or extends its slide. A hold above €290 in the coming sessions would offer the first technical signal that the selling pressure may be exhausting itself.
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