#半导体板块集体回调 After Micron Technology led a sharp dive from high levels, pressure quickly spread across the entire semiconductor sector, evolving on May 12 into a systemic sell-off affecting the full industry chain.

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📊 Market Overview:"

The Philadelphia Semiconductor Index (SOX) once sank as much as 6.8% intraday, setting a record for the largest intraday drop in over a year, before ending the day with its decline narrowing to more than 3%. Despite that, the index’s cumulative gain for the year is still above 60%, and the massive surge earlier has also amplified the breadth of the pullback.

Stocks fell broadly; no core leader was spared

Stock Intraday biggest drop Closing drop Year-to-date cumulative gain
Qualcomm (QCOM) About -15% -11.90% —
Intel (INTC) More than -11% -9.09% About +227%
SanDisk (SNDK) More than -11% -8.21% More than sixfold
Micron Technology (MU) More than -7% -6.76% About +178%
ASML (ASML) — -5.22% —
AMD — -4.27% —
TSMC (TSM) — -3.85% —
Broadcom (AVGO) — -3.02% —
NVIDIA (NVDA) — -1.38% —

Data source:

Qualcomm logged its worst single-day performance since March 2020, and Intel ranked second in the day’s S&P 500 declines. SanDisk has surged more than sixfold since the start of the year, and Intel’s year-to-date gain is close to 227%.

The only name that rose against the trend in the afternoon was NVIDIA, which will release its earnings on May 20. On that day, it recorded a slight gain, as market capital chose to concentrate a defensive posture around the “certainty of AI core computing power leadership” amid the broad sell-off.

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🔴 Five layers of bearish pressure behind the pullback

1. Inflation beyond expectations and a sudden shift in rate-hike expectations: the most direct trigger"

The latest CPI data released by the U.S. Bureau of Labor Statistics became the direct spark for this round of broad-based declines: April’s headline CPI jumped to 3.8% year over year (prior 3.3%, forecast 3.7%), the highest level since May 2023; core CPI rose to 2.8% year over year (prior 2.6%, forecast 2.7%), the highest since September 2025.

After the inflation data was released, markets quickly re-evaluated the Federal Reserve’s rate-hike path. The CME FedWatch Tool showed that the probability the market priced for a 25-basis-point hike in December surged from 21.5% the day before to above 30%. Bank of America further pushed out expectations for rate cuts to mid-2027, delaying them again compared with its earlier forecast of end-2026.

High-valuation tech stocks are extremely sensitive to rate expectations—once rates stay high, the present value of future cash flows is compressed significantly. This is the fundamental reason this sector was hit the hardest in this pullback.

D.A. Davidson Managing Director Gil Luria was even more direct, saying investors worry that persistent inflation will affect companies’ commitments to spend on data centers. If companies scale back AI investments, the entire chip demand chain could face the risk of a downward re-pricing.

2. Iran situation and a surge in oil prices: geopolitical premia skyrocketing

The Middle East has introduced new uncertainties. Disagreements intensified as U.S.-Iran negotiations restarted. Iran’s Ministry of Foreign Affairs explicitly demanded that “hostilities end and the blockade of the Strait of Hormuz be lifted” as a prerequisite for talks, but the U.S. side considers this difficult to accept. The UK has announced it will deploy fighter jets and warships to the Strait of Hormuz, further escalating the situation.

Oil prices then surged violently: June NY light sweet crude oil futures settled up $4.11 to $102.18 per barrel, a rise of 4.19%. Once oil prices broke through the $100 level, the comprehensive transmission chain of energy—food—rent—air tickets was poised to kick in, further strengthening inflation pressure on a self-reinforcing basis.

Michael Burry, the protagonist of “The Big Short,” posted a warning that day: “The Nasdaq 100 Index is about to undergo a complete reversal—markets are moving from boom to bust,” explicitly identifying the Iran conflict and the surge in oil prices as one of the potential triggers for a breakdown.

3. Concentrated profit-taking: the most fundamental endogenous market factor"

This pullback occurred at an extremely special moment: the Philadelphia Semiconductor Index’s year-to-date gain had already exceeded 60%, and the year-to-date gains of some key stocks were measured in several multiples—Intel up 227%, SanDisk up more than 500%, Micron Technology up 178%, and AMD up by several times. Such enormous accumulated gains mean the market only needs a slightly triggering signal, and positions can be liquidated quickly—like dominoes falling.

Jefferies stock trading analyst Jeffrey Favuzza explicitly attributed the sell-off to “signs of some buying exhaustion after the recent rally”—when buyer power starts to wane, supply-demand balance can easily flip to being seller-dominated, leading to rolling stampedes to sell.

The options market also showed proactive risk-control signals at the same time. Bearish bets on the Philadelphia Semiconductor Index surged explosively in the afternoon of May 12: the ETF tracking three times the inverse return of the index (SOXS) jumped 9.2%. BTIG Chief Market Technician Jonathan Krinsky further warned that, as momentum indicators become severely overheated, the index may face an “about 20% pullback.”

4. Wosh is set to become Chair: uncertainty forces re-pricing of the policy path

On May 12, the U.S. Senate formally confirmed Kevin Wosh as a Federal Reserve Board member for a 14-year term, clearing the final obstacle for him to become the next Fed Chair. The Senate is expected to cast a final vote on his chair nomination on May 14, as Powell’s chair term ends on May 15.

Wosh’s policy framework produced a fresh wave of reassessment in the market. He has made clear that he will push for a “policy shift,” with the core being aggressive balance-sheet reduction to create room for future rate cuts. In an environment where inflation data has already come in above expectations and oil prices remain elevated, this “squeeze bubbles first, then loosen” path has been interpreted by the market as a potential signal that valuation pressure on tech stocks will persist for the long term.

5. South Korea’s “AI tax” and Morgan Stanley’s warning: an amplifier of sentiment resonance

Discussion in South Korea during trading hours about “AI profit taxation / national dividends” introduced additional uncertainty, directly triggering linked sentiment across global storage sectors. As home to storage giants such as S h a l i n x, South Korea’s KOSPI dropped as much as 2.3% intraday, with foreign investors in net selling positions. Although the presidential office and related statements have “drawn a clear boundary,” the initial volatility has already spilled over into foreign investors’ sentiment.

At the same time, beyond AI chips, the “pullback in isolated winners” trade has started to spread. The prior “AI goes broad-based” rally—spanning multiple areas such as GPU, storage, CPU, foundry, equipment, and optical modules—has also been under pressure to deleverage across the board as risk appetite cools.

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📋 Key institutional milestones

Specific action recommendations have been detailed in “Micron Technology’s High-Level Jump,” and this article will not repeat them. The following focuses only on core observation points at the sector level:

Time Key event Core takeaways
May 20, 2026 (after market close) NVIDIA FY27 Q1 earnings Dubbed the “most important earnings report in the universe”—a direct test of whether demand for AI infrastructure remains strong
June 16–17 The first Fed meeting chaired by Wosh The first formal stance on inflation data and Wosh’s policy path, impacting overall valuation pressure on tech stocks
In recent weeks’ regular CPI releases and the Strait of Hormuz situation Whether marginal changes in the inflation path and geopolitical factors can stabilize —

NVIDIA’s earnings will be the watershed for determining whether this pullback is merely technical adjustment or a trend reversal, and also the most critical indicator for the global AI industry chain.