Launched by the Philadelphia Stock Exchange in December 1993 and now maintained by Nasdaq, the Philadelphia Semiconductor Index (SOX) tracks 30 major U.S. listed semiconductor companies. Its leading names include NVIDIA, Broadcom, AMD, Taiwan Semiconductor, Micron and Intel.

Semiconductor stocks had an extraordinary start to 2026. The SOX surged more than 100% before reaching a record high in late June, fuelled by strong demand for AI chips, data centres and advanced memory.¹

Then the rally hit a wall. The index fell as much as 29% from its June peak as investors began to question whether semiconductor valuations had moved too far ahead of earnings. Several concerns arrived at the same time, including weaker than expected AI chip guidance from Broadcom, higher oil prices, rising bond yields and growing competition from China.¹

The selloff was sharp, but it does not suggest a collapse in the semiconductor industry. Global chip sales continue to reach record levels, while demand for AI infrastructure remains strong. The problem is that after such a powerful rally, investors need to see strong earnings growth to justify elevated valuations.²

That raises the critical question facing semiconductor stocks now: can earnings catch up with the expectations already built into share prices?

The answer will depend on the pace of AI investment, demand for high bandwidth memory, interest rates, China’s growing semiconductor industry and, most importantly, whether the biggest companies in the sector can continue delivering the earnings growth investors expect.

The 2026 correction may therefore be about the market resetting expectations after an exceptionally strong run. The rally may not be over, but the easy gains could be.

What Triggered the Semiconductors Sell-Off?

The semiconductor sector is facing its biggest pullback of 2026 driven by several factors arriving at once.

1. A rally that simply ran too hot

The first problem was the rally itself. The SOX had rallied 106% year-to-date into its late-June all-time high. Such a parabolic move left valuations well above historical norms. 1 When a sector runs that far, that fast, profit-taking does not need a major catalyst, it just needs an excuse. That is what happened in the semiconductor sector. Once investors began questioning whether AI spending could continue at the same pace, some of the most expensive chip stocks became natural targets for profit-taking.

AMD, for instance, had gained roughly 175% year-to-date by June, leaving the stock vulnerable to a change in sentiment.

2. Broadcom raised the first warning flag

One of the first major cracks appeared after Broadcom reported its second-quarter results.

The company beat expectations for revenue and earnings, but its third-quarter AI semiconductor revenue guidance came in at $16 billion, below the roughly $17.2 billion expected by Wall Street. Broadcom also did not lift its full-year AI semiconductor forecast.³

That «sell the news» reaction knocked Broadcom shares down sharply and rippled through the entire AI supply chain, since Broadcom custom-silicon guidance is widely read as a proxy for hyperscaler AI spending intentions.³

This is because Broadcom is a major supplier of custom AI chips and its outlook provides investors with an important indication of how aggressively large technology companies are building AI infrastructure. The market therefore interpreted the guidance as a possible sign that AI spending might not be accelerating as quickly as investors had hoped.

3. Higher oil prices pushed bond yields higher

Then came a second problem: geopolitics. Tensions around Iran and the Strait of Hormuz pushed Brent crude above $84 a barrel and revived concerns about inflation. That combination pushed US Treasury yields toward their highest levels in decades, and high-multiple, long-duration growth stocks like semiconductors are the assets most sensitive to a higher discount rate. The pressure was not limited to the US with the market weakness spreading across Asia and Europe.¹

4. China chip ambitions added another layer of risk

Just as sentiment was stabilising, a second front opened: China. Reports that a Chinese state-backed manufacturer had begun mass-producing an immersion deep ultraviolet (DUV) lithography machine, a category that ASML has effectively dominated for decades, knocked ASML and its equipment peers sharply lower. At the same time, Chinese memory-chip maker CXMT attracted huge investor interest in its Shanghai listing, with institutional demand reportedly exceeding the available shares by more than 500 times. That revived fears that aggressive Chinese memory-chip expansion could eventually pressure the pricing power that had been such a tailwind for names like Micron and SK Hynix.³

5. Doubts about AI capex sustainability

Underneath all these issues sits the biggest question of all: Are the biggest technology companies spending too much on AI infrastructure?

Microsoft, Alphabet, Amazon and Meta have committed enormous amounts of capital to data centres, chips and AI infrastructure. That spending has been a major driver of semiconductor demand. But the bigger the investment becomes, the more investors are asking whether AI revenues will grow quickly enough to justify the enormous amount of money being invested today.

A graph of stock market Description automatically generated

Philadelphia Semiconductor Index illustrative path derived from exact closing levels.

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Semiconductor Demand Is Still Strong

This is where the 2026 correction becomes more interesting. Stock prices have fallen sharply, but the underlying semiconductor industry has not shown the same level of weakness. Global semiconductor sales reached a record $120.6 billion in May 2026, up 104.1% from a year earlier. It was the industry’s 15th consecutive monthly record. That is hardly the picture of an industry in collapse.⁴

Broadcom’s AI semiconductor revenue is still expected to reach $16 billion in the current quarter, representing growth of more than 200% year over year.

Micron has also pointed to exceptionally strong demand for high-bandwidth memory, while Applied Materials beat expectations for revenue and earnings and raised its fourth-quarter guidance in August. These numbers suggest that AI demand has not disappeared.

Instead, the market appears to be adjusting the price investors are willing to pay for that growth.

Source: World Semiconductor Trade Statistics, as cited in Nasdaq index research.

Is the Semiconductor Rally Over?

There are several reasons to believe that the long-term AI semiconductor growth theme remains intact. The amount of computing power required for AI continues to increase. Data centres need advanced processors, networking equipment and high-bandwidth memory. Semiconductor sales are still setting records, while several companies across the supply chain continue to report strong demand.

The market is also no longer pricing the sector with the same level of optimism seen at the June peak. That can create an opportunity. If earnings continue to rise while share prices remain below their previous highs, valuations can gradually become more reasonable.

There are already signs that investors are willing to return. The semiconductor index gained double digits in early August as strong technology earnings helped restore confidence in AI spending.

But the recovery is unlikely to be smooth. JPMorgan has argued that the pullback could create a buying opportunity, while Morgan Stanley has taken a more cautious view on the semiconductor sector during the second half of 2026.

The Biggest Risk Is AI Overinvestment

The most important risk for semiconductor stocks may not be China, oil or interest rates. It may be the possibility that AI infrastructure investment eventually grows faster than AI revenues.

The current AI cycle depends heavily on spending by a relatively small group of very large technology companies. If those companies continue increasing capital expenditure, chip demand should remain strong.

But if they decide that they have built enough data-centre capacity and begin slowing investment, the impact on semiconductor companies could be significant. This is why hyperscaler capital expenditure is one of the most important indicators for chip investors to monitor. Even a slowdown in the rate of growth could be enough to pressure semiconductor valuations.

Strong Industry Growth Does Not Guarantee Strong Stock Returns

If investors pay too much for future growth, it can take years of rising earnings for company fundamentals to catch up with share prices. That is the risk behind the AI investment boom today.

The AI industry can continue expanding rapidly, while some semiconductor stocks go nowhere for an extended period because their valuations had already priced in too much future growth. This is perhaps the biggest lesson from the 2026 semiconductor correction.

Professional investors looking for magnified exposure to the semiconductor sector may consider Leverage Shares +4x Semiconductors or -4x Semiconductors ETP.

Footnotes:

Intellectia.ai, Chip Stocks Selloff August 2026: Why Nvidia AMD Are Falling & What’s Next, as of August 19, 2026.
Investing.com, Semiconductor Sell-Off Weighs on Global Markets, Is the Correction Nearing an End?, as of July 17, 2026,
CNBC, AMD, Intel and Micron extend losses as chip stocks get clobbered, Jul 28, 2026, as of July 29, 2026.
Semiconductor Industry Association, Global Semiconductor Sales Increase 9.2% Month-to-Month in May, as of July 6, 2026.