Global semiconductor stocks including Samsung Electronics, SK Hynix, and Micron experienced extreme volatility this month, with average daily price swings of approximately 8% despite record earnings driven by the AI memory supercycle. On July 21 (local time), Micron surged 12.17% to $970.82, while SanDisk jumped 14.24%, AMD rose 8.11%, and Intel climbed 8.64% on the New York Stock Exchange; the same day, Samsung Electronics and SK Hynix gained 4-6% on the KOSPI. The volatility stems from a combination of single-stock leveraged ETFs launched in late May and fundamental uncertainty around semiconductor sector valuations, according to analysts. Market observers note that while leveraged ETFs amplify existing trends through rebalancing, the root cause of volatility lies in shifting expectations for the global semiconductor industry itself.
Micron and US Semiconductor Stocks Post Double-Digit Gains on July 21
On July 21 (local time), Micron closed at $970.82, up 12.17% from the previous trading day. SanDisk rose 14.24%, AMD gained 8.11%, and Intel increased 8.64% on the same day. In South Korea's KOSPI market on July 21, Samsung Electronics and SK Hynix recorded gains of 4-6%.
Semiconductor Stocks Average 7.99% Daily Volatility This Month
This month, the average intraday volatility for five major semiconductor stocks—Samsung Electronics, SK Hynix, Micron, AMD, and SanDisk—reached 7.99%. SK Hynix recorded the highest volatility at 10.08%, followed by SanDisk at 9.61%. Samsung Electronics registered 8.01%, Micron 6.54%, and AMD 5.71%. Intraday volatility is calculated by dividing the difference between the day's high and low by the average of the high and low, representing the ratio of price fluctuation relative to the day's midpoint.
This volatility significantly exceeds broader market movements. The NASDAQ Composite Index and S&P 500 Index recorded average intraday volatility of only 1.31% and 0.86%, respectively, this month. The comparison shows SanDisk's individual stock volatility was 8.5 times higher than the NASDAQ index. The KOSPI, which has high weightings in Samsung Electronics and SK Hynix, recorded 6.75% average intraday volatility this month.
Analysts Debate Leveraged ETF Impact on Volatility
Single-stock leveraged ETFs launched in late May have been identified as a contributing factor to the heightened volatility of Samsung Electronics and SK Hynix in the domestic market. Leveraged ETFs use derivatives such as futures and total return swaps (TRS) to pursue twice the daily return of the underlying asset, generating rebalancing demand that amplifies existing price trends whenever the stock moves.
However, some analysts argue that leveraged ETFs cannot be solely blamed for the volatility. Yeom Dong-chan, a researcher at Korea Investment & Securities, stated, "Leveraged ETF rebalancing is structured to amplify existing trends, not to reverse intraday trends," adding, "The fundamental cause of recent volatility expansion is the volatility of the global semiconductor industry itself."
Year-to-Date Volatility Reaches 8.28% for SanDisk
Expanding the timeframe to the full year reveals that US semiconductor stocks have exhibited even greater volatility. SanDisk's average intraday volatility for the year stands at 8.28%, indicating daily fluctuations of approximately 8% throughout the year. Micron recorded 6.18%, SK Hynix 5.95%, Samsung Electronics 5.10%, and AMD 4.99%, all exceeding 5%. These figures suggest that volatility is rooted more in industry outlook expectations and valuation debates than in product structure.
Daishin Securities Calls Recent Decline Irrational
Experts characterize the recent decline as irrational given the high expectations for global semiconductor companies. Ryu Hyeong-gun, a researcher at Daishin Securities, described the recent price drop in the semiconductor industry as "irrational stock price decline," stating, "The market experienced excessive price declines amid untimely peak controversy." He added, "Numerous reasons are always presented during sharp price drops, so now is the time to unravel the tangled threads one by one."
FAQ
What caused semiconductor stocks to surge on July 21?
On July 21 (local time), major semiconductor stocks posted significant gains, with Micron rising 12.17% to $970.82, SanDisk up 14.24%, AMD up 8.11%, and Intel up 8.64%. The same day, Samsung Electronics and SK Hynix rose 4-6% on the KOSPI.
How volatile have semiconductor stocks been this month?
This month, five major semiconductor stocks—Samsung Electronics, SK Hynix, Micron, AMD, and SanDisk—averaged 7.99% intraday volatility, with SK Hynix reaching 10.08% and SanDisk 9.61%. This compares to just 1.31% for the NASDAQ Composite and 0.86% for the S&P 500.
What do analysts say is causing the extreme volatility?
Yeom Dong-chan of Korea Investment & Securities stated that "the fundamental cause of recent volatility expansion is the volatility of the global semiconductor industry itself," while Ryu Hyeong-gun of Daishin Securities characterized the decline as "irrational stock price decline" and noted that "the market experienced excessive price declines amid untimely peak controversy."
