Samsung and SK Hynix Leveraged ETFs Are Shaking Japan’s Stock Market

 

Rising volatility in South Korean semiconductor stocks is spilling across the sea into Japan, where Kioxia and the Nikkei 225 are experiencing increasingly sharp price swings.

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The growing popularity of leveraged exchange-traded funds linked to Samsung Electronics and SK Hynix is no longer affecting only South Korea.

According to a report by the Nikkei, extreme fluctuations in South Korea’s leading semiconductor stocks are increasingly influencing Japan’s stock market, particularly shares related to artificial intelligence and memory chips.

The two markets operate in the same time zone, and their trading hours substantially overlap. As a result, sudden movements in Samsung Electronics and SK Hynix can be reflected almost immediately in Japanese semiconductor stocks such as Kioxia.

This growing connection has raised concerns that leveraged investment products are amplifying volatility across national borders.

Nikkei 225 Volatility Remains Unusually High

The Nikkei 225’s average intraday fluctuation rate—the gap between its daily high and low compared with the previous closing price—reached approximately 2.5% in July.

It also stood at around 2.6% in June.

Japan’s intraday market volatility has now exceeded 2% for three consecutive months. According to the report, this is the longest such period since the aftermath of the 2008 global financial crisis.

What makes the current situation unusual is that the volatility has continued even without a single major global financial shock.

Instead, the instability appears to be driven by a combination of factors:

• Rapid trading in leveraged single-stock ETFs
• Speculation surrounding AI and memory-chip companies
• Increasing use of margin loans by retail investors
• Growing foreign participation in Japanese individual stocks
• Stronger synchronization between the Korean and Japanese markets

Among these factors, the movement of Korean semiconductor stocks has emerged as an increasingly important variable.

What Are Samsung and SK Hynix Leveraged ETFs?

Leveraged ETFs are designed to produce a multiple of the daily return of an underlying asset.

For example, a 2x leveraged ETF linked to SK Hynix is designed to gain approximately 2% when the stock rises by 1% in a single trading day. However, it can also lose approximately 2% when the stock falls by 1%.

These products must regularly rebalance their positions to maintain their targeted daily leverage. During periods of heavy trading, this process can intensify buying pressure when prices rise and selling pressure when they fall.

Leveraged ETFs therefore do not merely increase an investor’s potential gains or losses. When they become sufficiently large, their trading activity may also amplify movements in the underlying stocks.

South Korea introduced domestically listed leveraged single-stock ETFs connected to companies including Samsung Electronics and SK Hynix in May 2026. Their rapid expansion and the resulting market instability have already prompted regulatory action.

The South Korean government has announced tighter rules, including a higher minimum cash deposit for retail investors and a temporary suspension of new single-stock leveraged ETF listings. Reuters

Why Is Japan’s Kioxia So Sensitive?

Kioxia is one of the world’s major producers of NAND flash memory and is closely connected to the same AI and semiconductor investment cycle affecting Samsung Electronics and SK Hynix.

When concerns grow about excessive AI spending, weaker memory-chip demand or falling chip prices, investors frequently sell semiconductor stocks across several countries at the same time.

On July 27, the KOSPI and Nikkei 225 reportedly reversed downward at almost the same time, demonstrating how closely the two markets can move during semiconductor-driven trading.

Kioxia’s share price had climbed as high as 112,700 yen in early June, briefly making the company Japan’s largest by market capitalization. By the morning of July 27, however, the stock had fallen to 54,550 yen.

That represents a decline of more than 50% from its peak in less than two months.

Growing concerns about overinvestment in AI infrastructure played a major role, but aggressive short-term and margin trading also appears to have accelerated the movement.

More Kioxia Leveraged ETFs May Be Coming

Market volatility could increase further as asset managers prepare to introduce leveraged and inverse investment products linked to Kioxia in the United States.

According to Bloomberg, at least nine proposed ETFs designed to deliver twice the daily return—or twice the inverse daily return—of Kioxia shares or depositary receipts are awaiting approval.

One product proposed by Tuttle Capital could reportedly be listed as early as August.

Matthew Tuttle, CEO of Tuttle Capital, said interest was coming not only from American investors but also from South Korea. Korean capital reportedly accounts for roughly one-third of the firm’s assets under management.

This suggests that Korean retail investment could influence Kioxia through multiple channels: directly through Japanese shares and indirectly through US-listed leveraged products.

Margin Trading Adds Another Layer of Risk

Japanese retail investors are also making greater use of borrowed money.

The outstanding balance of margin-financed stock purchases in Japan has surpassed 6 trillion yen, reaching a record high.

Kioxia’s high share price has made margin financing particularly attractive to traders seeking larger positions with limited capital. However, when the share price drops, forced selling and margin calls can deepen the decline.

Foreign investors are also trading Japanese individual stocks more actively. Daily turnover on the Tokyo Stock Exchange’s Prime Market now regularly exceeds 10 trillion yen.

Historically, many overseas investors used Japanese index futures. Their growing shift toward individual cash equities may be producing larger price movements in heavily traded companies.

The Bigger Picture: Semiconductor Markets Are Becoming More Connected

The volatility surrounding Samsung Electronics, SK Hynix and Kioxia shows how semiconductor stocks are increasingly operating as part of a single regional—and global—trading ecosystem.

A leveraged product listed in South Korea can influence Korean chip stocks. Those movements can quickly affect related companies in Japan, while new US-listed ETFs may channel additional international capital back into the same group of stocks.

This creates a feedback loop:

Leveraged ETF trading → larger movements in Korean chip stocks → synchronized moves in Japanese semiconductor shares → additional speculative trading and rebalancing.

For investors, the most important lesson is that leveraged ETFs are designed to track daily performance, not necessarily long-term returns. Compounding, rebalancing costs and extreme volatility can cause their performance to differ significantly from simply multiplying the underlying stock’s long-term return.

The semiconductor industry may continue to benefit from long-term AI growth. However, the rapid expansion of leveraged products means that short-term stock prices could become increasingly detached from corporate fundamentals.

As Korean, Japanese and US markets become more interconnected, volatility originating in one country may spread to the others within minutes.

This article is for informational purposes only and does not constitute investment advice.