Thursday | AI stocks tumble as oil prices reignite inflation fears
Wall Street faced a double blow Thursday: oil prices surged while confidence in the AI trade weakened.
After reaching record highs earlier this week, the S&P 500 and Nasdaq fell for a second consecutive session. Semiconductor stocks led the retreat following questions about OpenAI’s revenue, while renewed tensions involving Iran sent oil prices sharply higher.
The Dow managed a small gain, but the technology-heavy Nasdaq suffered a much steeper decline.
Dow Jones
+0.09%
51,231.64
S&P 500
−0.46%
7,765.36
Nasdaq
−1.24%
27,193.34
Thursday’s closing results, with percentage changes rounded to two decimal places.
Reuters
+1
The AI Trade Faces a Reality Check
The biggest development in technology came from a report in the Financial Times questioning OpenAI’s revenue figures.
According to the report, OpenAI’s annualized revenue was approximately $20 billion lower than previously indicated.
That doesn’t necessarily mean OpenAI is losing money at a faster rate than expected, nor does it establish that demand for AI is collapsing. But it raises an important question about how quickly the industry can convert enormous investments into sustainable revenue.
The market reaction was immediate.
Nvidia, Micron, Intel, Broadcom and other semiconductor companies came under selling pressure. The technology sector was the S&P 500’s weakest performer, declining about 1.8%.
The Wall Street Journal
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Why would a revenue report about one AI company affect the entire semiconductor industry?
Because the AI investment ecosystem is highly interconnected.
Chip manufacturers sell to data-center operators. Cloud companies provide computing capacity to AI developers. Investors finance infrastructure based on expectations of future demand.
If the revenue potential of a major AI developer is lower than anticipated, investors may begin questioning whether the enormous spending throughout the supply chain can be justified.
The question is shifting from how much AI infrastructure companies can build to how much money that infrastructure can earn.
Nvidia and the Semiconductor Boom
The semiconductor industry has been one of 2026’s biggest winners.
According to Reuters, semiconductor stocks had risen more than 80% this year before Thursday’s selloff.
Reuters
That extraordinary performance reflects strong demand for chips used in AI training, inference, memory and networking.
But it also creates a valuation challenge.
When investors have already priced in years of exceptional growth, even disappointing information from an important customer can produce sharp stock-market reactions.
Consider the contradiction:
Taiwan Semiconductor Manufacturing reported strong September sales growth.
Samsung forecast a substantial increase in quarterly operating profit.
Yet semiconductor shares still declined.
Investors weren’t necessarily questioning whether chips were selling today.
They were questioning whether future demand would be sufficient to justify current valuations.
The Wall Street Journal
Oil Surges as Middle East Tensions Escalate
While technology stocks were falling, the energy market was moving in the opposite direction.
Brent crude — Thursday settlement
$104.28
+4.1%
Oil rose sharply amid renewed concerns about shipping disruptions in the Persian Gulf, the conflict involving Iran and hurricane-related reductions in US production.
AP News
Earlier in the day, Brent had approached $105 per barrel.
President Trump subsequently said the United States would not attack Iran before the November midterm elections.
His comments helped reduce some of the immediate geopolitical anxiety, but oil remained substantially higher for the day.
The Wall Street Journal
Why Oil Matters So Much
Higher oil prices aren’t simply a problem for drivers.
They affect the cost of transporting almost everything.
Trucking companies pay more for diesel. Airlines pay more for fuel. Manufacturers face higher energy and shipping costs.
Businesses may eventually pass those expenses along to customers.
That’s why oil above $100 is such an important challenge for the Federal Reserve.
The US labor market is showing signs of cooling, which could reduce wage-related inflation.
But expensive energy is pushing in the opposite direction.
The Fed faces an uncomfortable combination:
Slower employment growth and renewed inflation pressure.
If policymakers raise rates too aggressively, they risk weakening the economy further.
If they hold rates too low, inflation may remain elevated.
Treasury Yields Finally Ease
There was one encouraging development.
Treasury yields declined after a volatile session.
| Treasury maturity | Approximate yield |
|---|---|
| 10-year | 5.23% |
| 30-year | 5.61% |
A strong Treasury bond auction helped stabilize the market, while Trump’s comments about Iran reduced some immediate fears.
AP News
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Lower yields generally provide relief for stocks, particularly companies whose valuations depend heavily on future earnings.
But Thursday demonstrated that falling bond yields aren’t always enough.
When investors begin questioning the profitability of the AI boom, technology stocks can decline even as borrowing costs ease.
Interestingly, approximately 66% of S&P 500 companies advanced Thursday despite the index falling.
AP News
That reveals how much influence the largest technology companies have over the overall market.
PepsiCo Offers an Earnings-Season Preview
Not everything was negative.
PepsiCo shares climbed approximately 3.7% after reporting quarterly results that exceeded expectations.
The company also outlined additional cost reductions as it works to improve its North American business.
Although PepsiCo lowered its full-year earnings outlook, investors responded positively to signs of operational improvement.
The Wall Street Journal
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This is an important reminder that individual companies can still perform well when the broader market is under pressure.
Earnings season will increasingly separate businesses that are delivering measurable results from those relying primarily on investor enthusiasm.
The Jobs Market Is Still Holding Up
Thursday’s weekly unemployment claims data offered another piece of the economic puzzle.
Initial jobless claims came in at approximately 197,000 for the week ending October 3.
That remains relatively low by historical standards.
In other words, the labor market isn’t showing signs of widespread layoffs.
But last Friday’s disappointing September employment report showed that companies are hiring far fewer workers.
The distinction matters.
Low layoffs do not necessarily mean strong hiring.
Businesses can retain existing employees while becoming increasingly reluctant to expand their workforce.
For the Fed, this suggests an economy that is cooling without necessarily entering a sharp contraction.
Earnings Expectations Are Enormous
Wall Street is preparing for third-quarter earnings season.
According to FactSet estimates, S&P 500 earnings are expected to grow approximately 29.5% year over year.
If achieved, that would mark the third consecutive quarter with earnings growth above 25%.
Those expectations help explain why the market has remained so resilient.
Investors believe corporate profits can continue expanding despite expensive energy, high interest rates and geopolitical uncertainty.
But high expectations can become a problem.
A company doesn’t merely need to report good earnings.
It needs to outperform what investors have already priced into the stock.
And for AI companies, those expectations have become exceptionally demanding.
The Bigger Story: AI Revenue Versus AI Spending
Today’s selloff raises a question that will likely become increasingly important.
The AI industry is spending extraordinary amounts of money.
Companies are constructing enormous data centers, purchasing advanced semiconductors, securing electricity supplies and financing long-term computing contracts.
But the ultimate value of those investments depends on revenue from customers willing to pay for AI services.
If spending continues growing faster than revenue, investors may eventually reconsider the industry’s valuations.
This doesn’t mean AI is a bubble or that the technology lacks economic value.
It means that a transformative technology and an attractive investment are not necessarily the same thing at every price.
That’s a distinction investors should keep in mind.
The Bottom Line
Thursday’s market offered three important lessons.
First, geopolitics still matters. Oil prices can rise sharply when energy supplies are threatened, complicating the Fed’s efforts to control inflation.
Second, AI enthusiasm has limits. Investors are beginning to scrutinize whether revenue growth can justify the industry’s enormous capital expenditures.
Third, market concentration creates vulnerability. Even when most S&P 500 stocks advance, weakness in a handful of technology giants can pull the index lower.
The numbers tell the story:
| Indicator | October 8 |
|---|---|
| Dow Jones | +0.09% |
| S&P 500 | −0.46% |
| Nasdaq | −1.24% |
| Brent crude | $104.28 |
| 10-year Treasury | ~5.23% |
| 30-year Treasury | ~5.61% |
| Initial jobless claims | 197,000 |
| Expected Q3 earnings growth | 29.5% |
The AI boom isn’t necessarily ending.
But the market may be entering a new phase.
For the past few years, investors rewarded companies for promising to build the future of AI.
Increasingly, they may demand proof that building that future will generate adequate profits.
And with oil above $100, the cost of getting there isn’t becoming any cheaper.
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