Kioxia Shares Hit 12% as Toshiba Trims Stake and Seoul Tightens ETF Rules
Published on 07/25/2026 at 18:32 | Redaktion boerse-global.de
The Japanese memory chip maker Kioxia suffered its steepest single-day decline in months on Friday, with shares closing at €294.00 after shedding 12.24% in a session that saw multiple headwinds converge. The stock now trades nearly 53% below its June 22 high of €621.00, having lost 39.51% over the past 30 days alone.
The sell-off was triggered by a confluence of events that hit the NAND flash specialist from different angles. Toshiba, long viewed as a strategic anchor shareholder, disclosed on Thursday that it had reduced its stake from 16.10% to 15.10%. While the move represents a relatively modest reduction of one percentage point, the timing could hardly have been worse for a stock already under pressure. For a company that has relied on Toshiba's backing as a stabilizing force, any signal of disengagement from a major holder tends to amplify uncertainty in nervous markets.
Simultaneously, South Korea's Financial Services Commission (FSC) accelerated the implementation of stricter rules for leveraged single-stock ETFs. Originally scheduled for August, the new regulations will now take effect on July 31, 2026. The FSC is raising the minimum investment threshold from 10 million won to 30 million won and requiring investors to post only cash as collateral, eliminating the use of securities. The move directly targets the kind of high-volatility tech names that have become popular vehicles for leveraged products, and Kioxia — with its annualized volatility of 164.23% — fits the profile perfectly.
The regulatory shockwave sent the Kospi index plunging 5.72% on Thursday to 6,690.62 points, a roughly 30% decline from its June peak. South Korea's memory chip heavyweights SK Hynix and Samsung Electronics both suffered double-digit losses in the same session. The contagion spread quickly to Tokyo, where Kioxia fell approximately 9.5% that day and the broader Nikkei 225 dropped 2.73%. US-listed Kioxia shares also slid into double-digit territory.
Should investors sell immediately? Or is it worth buying Kioxia?
Foreign investors have already executed net sales in South Korea this year reaching triple-digit billions of won — a record pace — as what analysts describe as a multi-layered selling wave unfolds. Forced liquidations tied to index rebalancing, unwinding of leveraged ETF positions, and hedge fund deleveraging have all compounded the downward pressure. The Kospi has triggered 41 so-called sidecar trading halts since January, surpassing the frequency seen during the 2008 financial crisis.
Merger Talks Resurface Amid the Chaos
Despite the carnage, Kioxia's strategic narrative remains intact. Reports indicate that Western Digital has revived merger discussions with the Japanese chipmaker. A combination would unite Western Digital's hard disk drive business with Kioxia's NAND production capabilities, creating a diversified storage giant better positioned to challenge Samsung and SK Hynix. The talks had previously stalled but appear to have regained momentum as both companies seek scale in an increasingly concentrated market.
Earnings Due as Demand Holds
All eyes now turn to July 31, when Kioxia will report first-quarter results for fiscal year 2027. The release comes on the heels of quarterly numbers from SK Hynix and Samsung Electronics, providing a broader picture of the memory cycle. Market expectations point to a doubling of quarterly profit year-over-year, driven by sustained demand for AI-related storage solutions in data centers. A DRAM-focused industry fund has continued to attract inflows of roughly $9.4 billion even as it has lost nearly 29% from its peak, suggesting that institutional conviction in the sector's fundamentals has not entirely evaporated.
Kioxia at a turning point? This analysis reveals what investors need to know now.
The paradox is hard to miss: the underlying demand for memory chips remains robust, with additional production capacity not expected to come online until 2027 or 2028 at the earliest. Yet the stock's behavior tells a different story, with the relative strength index at 39.7 — approaching oversold territory but not yet extreme. The close at €294.00 sits just above the 100-day moving average of €288.96, which could provide a first line of technical support. The gap to the 50-day average of €411.61, however, underscores just how sharply the medium-term picture has deteriorated.
For investors trying to separate fundamental reality from technical and regulatory noise, the next few sessions will be critical. The earnings report on July 31 will offer the clearest signal yet whether Kioxia's current weakness is a buying opportunity or the beginning of a deeper correction.
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