Weekly Market Review | AI optimism turns into a selloff as Alphabet and Intel plunge, the Fed holds rates steady, and oil prices surge

Wall Street began the final week of October with renewed excitement about artificial intelligence. By Friday, that optimism had largely disappeared.

The week started with news that Anthropic had filed paperwork to begin the process of going public, encouraging investors to buy technology stocks. But disappointing earnings from Alphabet, Amazon and Intel quickly changed the mood.

Investors began asking an increasingly important question: How much money will AI companies need to spend before their investments generate meaningful profits?

The Nasdaq Composite ended the week down approximately 2%, including a devastating 2.9% decline on Friday. The S&P 500 lost 0.6% for the week, while the Dow Jones Industrial Average fell 0.9%.

Meanwhile, the Federal Reserve held interest rates steady, oil companies reported extraordinary profits, and cryptocurrency markets were shaken by reports of a massive $6.3 billion hack involving Binance.

It was a week that reminded investors of a fundamental principle: exciting technology and attractive investment returns aren’t necessarily the same thing.

1. How the Major Indexes Performed

Technology stocks suffered the heaviest losses.

The Nasdaq’s 2% weekly decline was driven largely by disappointing earnings from major technology companies and growing doubts about the financial returns on artificial intelligence investments.

Friday was especially difficult.

The Nasdaq plunged 2.9%, its worst daily performance since June, according to the supplied report.

The S&P 500 and Dow also ended the week lower, showing that the selloff wasn’t confined to technology companies.

October’s broader picture

For the full month, the Nasdaq lost approximately 5.2%, its worst monthly performance since March 2025.

The S&P 500 declined approximately 1.2%, while the Dow managed a gain of 1.5%.

The contrast suggests that investors became increasingly selective about the companies and sectors they were willing to own.

2. Monday: Anthropic’s IPO Filing Sparks an Early Rally

The week began with enthusiasm surrounding Anthropic, one of the leading developers of advanced artificial intelligence models.

Anthropic reportedly filed paperwork to begin the process of becoming a publicly traded company.

Investors welcomed the prospect of gaining direct exposure to another major AI developer.

The filing offered investors a more detailed look at Anthropic’s business and financial prospects.

The announcement helped lift technology shares early in the week.

But the enthusiasm also highlighted a growing contradiction in the AI investment boom.

Artificial intelligence companies are attracting extraordinary amounts of capital.

At the same time, their infrastructure requirements are becoming increasingly expensive.

Training advanced models requires specialized processors, enormous computing capacity and large amounts of electricity.

Developing and maintaining these systems can cost billions of dollars.

For companies seeking outside financing, the central question is becoming less about technological potential and more about financial sustainability.

Can these businesses generate enough future cash flow to justify today’s enormous investments?

That question would dominate the rest of the week.

3. Wednesday: The Federal Reserve Holds Interest Rates Steady

On Wednesday, October 28, the Federal Reserve announced that it would leave interest rates unchanged.

The decision was widely expected, and the initial reaction in stock and bond markets was relatively muted.

However, the Fed’s decision mattered for the technology sector.

Artificial intelligence infrastructure is extraordinarily capital-intensive.

Companies building data centers need to finance expensive projects that may take years to generate sufficient returns.

When interest rates remain elevated, borrowing becomes more expensive.

Higher financing costs can reduce the profitability of projects that once looked attractive when money was cheaper.

This is particularly important for companies that depend on external capital rather than internally generated cash flow.

Why interest rates matter for AI

Consider a company planning to invest $10 billion in data centers.

If it finances that investment with debt at 4%, the annual interest expense would be approximately $400 million.

At 7%, annual interest expense would rise to $700 million.

That’s an additional $300 million per year.

The example is simplified, but it illustrates why financing costs can materially affect investment returns.

Higher interest rates also reduce the present value of profits expected far into the future.

That can put pressure on the valuations of high-growth technology companies.

4. Thursday: Alphabet Suffers a Historic Collapse

Thursday’s reported share decline: −12.6%

Alphabet, the parent company of Google, delivered one of the week’s biggest shocks.

Its shares plunged approximately 12.6% Thursday after quarterly earnings disappointed investors.

According to the supplied report, Alphabet lost approximately $497 billion in market capitalization in a single session.

That would make it the second-largest one-day market-value loss for a U.S. company on record.

The magnitude of the decline was extraordinary for a company of Alphabet’s size.

What went wrong?

Alphabet’s core search business reportedly generated less revenue than analysts expected.

Meanwhile, the company consumed cash faster than Wall Street anticipated.

Investors focused particularly on the enormous spending required to expand AI infrastructure.

Alphabet has been investing in data centers, specialized processors and advanced artificial intelligence systems.

These investments may eventually produce substantial profits.

But the company must spend the money today, while the financial returns remain uncertain.

The lesson from Alphabet

A business can have an outstanding competitive position and still be a disappointing investment if expectations are too high.

Alphabet remains one of the world’s most important technology companies.

Its search, advertising, cloud computing and AI businesses are substantial.

But investors are increasingly unwilling to overlook weak financial results simply because a company has an ambitious AI strategy.

5. Friday: Intel Plunges Almost 29%

Friday: approximately −29%

Intel suffered an even more dramatic collapse after reporting disappointing quarterly results and issuing a weak outlook.

Its shares plunged almost 29% Friday, according to the supplied weekly report.

Intel’s difficulties reflected several challenges.

A shortage of memory chips and other supply-chain problems weighed on personal computer sales.

The company also faced weaker-than-expected demand in important parts of its business.

The result was a sharp reassessment of Intel’s prospects.

According to the supplied figures, the company lost approximately $140 billion in market capitalization in one day.

Intel shares ended the week down roughly 24%.

Not all semiconductor companies benefit equally from AI

The semiconductor industry is often treated as a single investment theme.

But the reality is more complicated.

Some companies specialize in processors used to train AI models.

Others manufacture memory chips, networking equipment or traditional PC processors.

The financial outlook can vary significantly between these businesses.

Strong AI demand doesn’t automatically translate into strong profits for every semiconductor manufacturer.

Intel’s collapse was a reminder that investors must evaluate individual companies rather than assume an entire industry will benefit equally.

6. Amazon’s Earnings Add to AI Spending Concerns

Reported share decline: approximately −3%

Amazon also disappointed investors, despite strong growth in its cloud computing business.

Amazon Web Services reported its fastest revenue growth in years.

Overall company revenue increased approximately 12% to $201.9 billion, according to the supplied report.

However, revenue still fell short of analysts’ expectations.

Amazon shares declined approximately 3%.

AWS is growing, but so are costs

Amazon Web Services is one of the world’s leading providers of cloud computing infrastructure.

The company is investing heavily to meet demand for AI services.

But expanding its infrastructure requires substantial capital spending.

Data centers must be built.

Servers must be purchased.

Electricity and cooling capacity must be secured.

And expensive processors must be installed and maintained.

The challenge is determining whether future customer demand will justify these investments.

Amazon’s results reinforced the same concern that affected Alphabet.

Investors want evidence that AI-related spending will translate into attractive returns.

7. Energy Stocks Shine as Oil Prices Rise

While technology stocks struggled, the energy sector enjoyed a much stronger week.

ExxonMobil and Chevron reported extraordinary quarterly profits, supported by high oil prices and strong refining margins.

The conflict in the Middle East and disruptions to energy infrastructure contributed to elevated crude oil prices.

Concerns about potential additional U.S. military action against Iran added to uncertainty.

Meanwhile, disruptions affecting refineries in Russia and the Middle East helped tighten fuel supplies.

ExxonMobil reports $15.4 billion in earnings

Exxon’s quarterly earnings reportedly climbed to $15.4 billion, an increase of 104% from the same period a year earlier.

That represented the company’s strongest quarterly earnings since 2022.

Exxon shares gained approximately 2.2% Friday.

Chevron earns $9.9 billion

Chevron reported quarterly profits of approximately $9.9 billion, nearly triple the year-earlier figure.

Its shares advanced around 1% Friday.

Both companies benefited from strong refining operations.

Diesel prices had reached record levels in the United States in September, according to the supplied report.

Oil finishes the week near $113

Brent crude

~$113

Per barrel

Weekly Brent change

+0.8%

Approximate

Higher oil prices can benefit energy producers.

However, they also increase transportation, manufacturing and household expenses.

That can contribute to inflation and complicate monetary policy.

The same development that supports profits in one sector can create challenges for the broader economy.

8. Binance Hack Shakes Cryptocurrency Markets

Cryptocurrency investors faced a different kind of risk this week.

According to the supplied report, hackers stole approximately $6.3 billion in digital assets from Binance, the world’s largest cryptocurrency exchange.

The reported attack occurred Thursday and led Binance to suspend customer withdrawals.

Blockchain investigators reportedly attributed the incident to North Korean state-sponsored hackers.

Binance founder Changpeng Zhao said the company would be able to cover customer losses.

The exchange also reportedly began working with law enforcement and planned to restore withdrawals.

These claims, particularly the reported theft amount and attribution, require independent confirmation.

Cryptocurrency stocks decline

Coinbase declined 10.6%, Strategy fell 7.8%, and Robinhood lost 7.2%.

These declines show how developments in cryptocurrency markets can affect publicly traded companies with significant exposure to digital assets.

However, the reported market reaction did not necessarily indicate widespread panic throughout the cryptocurrency industry.

The episode illustrates a risk that traditional stock-market investors don’t always encounter in the same form: dependence on the security and financial integrity of cryptocurrency exchanges.

9. The Week’s Biggest Winners and Losers

Selected Stock Market Movers

October 26–30, 2026

Company	Reported change	Period
Intel	−24%	Week
Alphabet	−12.6%	Thursday
Coinbase	−10.6%	Friday
Strategy	−7.8%	Friday
Robinhood	−7.2%	Friday
Amazon	~−3%	Friday
ExxonMobil	+2.2%	Friday
Chevron	+1.0%	Friday

Selected moves from the supplied report, not a ranking of all U.S. stocks. Periods differ and are labeled to avoid treating daily and weekly returns as directly comparable.

The week’s biggest theme was the growing gap between investors’ expectations and companies’ actual financial performance.

Intel and Alphabet suffered historic declines.

Amazon also disappointed investors despite impressive cloud computing growth.

Meanwhile, energy companies benefited from elevated oil prices and strong refining margins.

The divergence illustrates how market leadership can change when economic conditions and investor expectations shift.

10. What This Week Tells Us About the AI Investment Boom

For several years, artificial intelligence has been one of the most powerful investment themes in financial markets.

Companies have committed enormous amounts of capital to data centers, processors and advanced computing infrastructure.

Investors have often rewarded those commitments with higher stock valuations.

But this week demonstrated that enthusiasm has limits.

Three questions investors are now asking

First: How much capital will AI require?

Building the infrastructure necessary to support advanced AI systems may require hundreds of billions of dollars.

Those investments create financial obligations long before the expected benefits are fully realized.

Second: When will the spending become profitable?

Revenue growth is important, but companies ultimately need to earn adequate returns on invested capital.

A business that spends $100 billion to generate an additional $5 billion in annual profit may not create as much shareholder value as investors expect.

Third: What happens if financing remains expensive?

Higher interest rates increase borrowing costs.

They can also reduce the attractiveness of long-term investments whose returns depend on profits many years in the future.

For companies relying on debt markets, access to affordable capital is particularly important.

This doesn’t mean AI technology is failing.

It means investors are becoming more disciplined about distinguishing technological progress from investment profitability.

11. What I’m Watching Next Week

The first trading week of November could be important for several reasons.

• Big Tech: Investors will continue evaluating AI capital spending, free cash flow and management guidance.
• Interest rates: Bond yields and Federal Reserve expectations could influence technology valuations.
• Oil and geopolitics: Any escalation in the Middle East could increase volatility in energy markets.
• Corporate earnings: Investors will look for companies delivering strong results without excessive spending.
• Cryptocurrencies: Market participants will monitor developments surrounding the reported Binance security breach.

The market’s next direction may depend on whether investors regain confidence in corporate profitability or continue reducing exposure to expensive growth stocks.

The Bottom Line: Great Technology Doesn’t Guarantee Great Returns

The week of October 26–30 began with optimism about Anthropic’s potential public offering.

It ended with a broad technology selloff, historic losses for Alphabet and Intel, and renewed concerns about the economics of artificial intelligence.

The Federal Reserve held interest rates steady, leaving financing costs elevated for companies making massive infrastructure investments.

Meanwhile, oil companies enjoyed exceptional profits, and cryptocurrency investors faced new security concerns.

The lesson is that markets ultimately care about financial results.

Artificial intelligence may transform the global economy.

But shareholders won’t necessarily benefit equally from every company participating in that transformation.

Some businesses will build extraordinary technology but struggle to earn attractive returns.

Others will find ways to convert innovation into durable profits.

The companies that create the most shareholder value won’t necessarily be those spending the most money on AI. They’ll be those that generate the best returns on that spending.

That distinction may become one of the most important investment lessons of the coming decade.

Other Stock Market blog posts

• Stock Market Recap — October 30, 2026
• Stock Market Recap — October 29, 2026
• Stock Market Recap — October 28, 2026