Global financial markets experienced another turbulent week as growing concerns about artificial intelligence spending triggered a sharp selloff across major technology stocks. What initially appeared to be a promising week, supported by news of a potential record breaking Anthropic IPO and hopes of easing tensions between the United States and Iran, quickly turned into a difficult period for investors.
By Thursday, several leading technology companies were facing substantial losses. Alphabet recorded its worst trading session on record, ServiceNow plunged by approximately 26%, and both Marvell and Fortinet suffered steep declines. The selling continued after regular trading hours, with Intel and Amazon also coming under pressure.
At the center of the downturn was a growing concern about the financial sustainability of the AI investment boom. Technology giants are committing hundreds of billions of dollars to infrastructure and computing capacity, while investors are increasingly questioning when those investments will generate meaningful returns.
The Nasdaq 100 moved approximately 7% below its early October peak, approaching correction territory. Meanwhile, the Federal Reserve maintained interest rates but signaled that another increase remained possible in December. Oil prices stayed elevated amid renewed attacks in the Persian Gulf, while European markets faced additional uncertainty following Christine Lagarde's unexpected announcement that she would leave the European Central Bank ahead of schedule.
Thursday marked a significant turning point in market sentiment toward major technology companies. Investors appeared increasingly unwilling to overlook disappointing financial results or exceptionally high spending commitments, even from businesses previously considered leaders of the AI revolution.
Alphabet experienced a dramatic 12.6% decline, erasing approximately $500 billion in market capitalization during its worst trading session in history. The company reported quarterly spending of $51 billion, pushing free cash flow into negative territory, while growth in its core search operations showed signs of slowing.
The weakness extended across the technology sector. ServiceNow lost approximately 26% following a relatively modest earnings disappointment, as concerns intensified that artificial intelligence could disrupt established enterprise software business models.
Fortinet declined by roughly 20%, while semiconductor company Marvell fell 13% following reports of a possible acquisition of Lumentum through a substantial stock based transaction.
The negative momentum continued after the closing bell. Intel shares dropped more than 20% following disappointing forward guidance, while Amazon declined around 7%, despite reporting its strongest cloud business growth in almost five years.
The broader consequences were immediate. The Nasdaq fell 1.6%, and selling pressure spread into Asian markets on Friday, with South Korea's Kospi losing nearly 5%.
The developments highlighted a major shift in investor expectations. Strong growth prospects alone were no longer sufficient to justify rising valuations when accompanied by substantial costs and uncertain profitability.
The technology selloff reflected a deeper question that has increasingly dominated market discussions, whether the extraordinary spending required to develop artificial intelligence can generate adequate financial returns.
Several major companies revealed investment commitments that reinforced concerns about the scale of the AI infrastructure expansion.
Amazon maintained its annual capital expenditure plans at approximately $220 billion, even as its free cash flow over the previous twelve months reportedly moved into negative territory by around $42 billion.
Alphabet outlined spending of approximately $200 billion for the year and indicated that investment requirements could increase further in 2027.
Meta was reportedly preparing a $95 billion share offering to support its AI ambitions, while SpaceX secured approximately $40 billion in borrowing to finance additional AI computing infrastructure.
Microsoft provided a contrasting example. Its Azure cloud division recorded growth of 48%, while the company continued generating approximately $18.6 billion in free cash flow.
This difference became particularly important for investors. Companies demonstrating strong revenue growth alongside healthy cash generation appeared better positioned than those relying on increasingly expensive investment programs.
The market's attitude toward artificial intelligence may therefore be entering a new phase. Rather than rewarding ambitious spending announcements, investors are beginning to demand evidence that AI investments can translate into sustainable earnings, stronger cash flow and measurable business growth.
Energy markets continued to face significant geopolitical uncertainty as renewed attacks across the Middle East maintained concerns about global oil supplies.
Brent crude finished the previous week near $117 per barrel, its highest closing level since April, following multiple Houthi attacks targeting Saudi infrastructure, including an airport and an oil facility.
Prices initially declined on Monday after diplomatic representatives from Saudi Arabia, Turkey and Pakistan met Iranian officials in Tehran. The discussions temporarily encouraged expectations that regional tensions could ease.
However, optimism quickly disappeared as reports emerged that Washington had advised Gulf allies to prepare for a potentially brief but intense military campaign against Iran following the November 3 midterm elections.
Oil prices subsequently recovered, reflecting renewed concerns about supply disruptions.
A diplomatic message from US Vice President JD Vance to Tehran briefly reduced market tensions on Thursday. Nevertheless, further claims of attacks on the Ras Tanura and Rabigh refineries brought supply risks back into focus.
On Friday, Iranian authorities reported that three oil tankers had struck mines near the Strait of Hormuz, one of the world's most strategically important shipping routes for energy exports.
Brent remained supported around $113 per barrel, with traders monitoring whether a sustained move higher could push prices toward $120 in the following week.
Persistently elevated energy prices also complicated the inflation outlook, adding another challenge for central banks attempting to stabilize consumer prices without significantly weakening economic growth.
The Federal Reserve maintained its benchmark interest rate within the 3.75% to 4.00% range, in line with market expectations, but policymakers continued signaling that additional monetary tightening could become necessary.
Federal Reserve Chair Kevin Warsh, who oversaw the central bank's first interest rate increase in three years during September, emphasized that the fight against inflation remained unfinished.
The latest policy decision also revealed increasing disagreement within the Federal Open Market Committee.
Two officials, Lisa Cook and Beth Hammack, supported an immediate interest rate increase, marking a departure from the unanimous decision recorded at the previous meeting.
Fresh economic data subsequently strengthened the argument for maintaining restrictive monetary policy.
The US economy expanded at an annualized rate of 3.4% during the third quarter, exceeding expectations of 3.2%. Consumer spending remained a major contributor to economic activity, suggesting that domestic demand was continuing to support growth despite elevated borrowing costs.
Inflation indicators, however, offered less encouraging signals.
The Federal Reserve's preferred inflation measure reportedly climbed to 3.6% annually, while core Personal Consumption Expenditures inflation reached 3.1%. Both readings represented their highest levels since May.
These figures reinforced expectations that policymakers might need to increase interest rates again before the end of the year.
Money markets subsequently assigned a probability exceeding 80% to a December rate hike.
For equity investors already concerned about technology valuations and the rising cost of capital, the prospect of continued monetary tightening added another source of uncertainty.
Despite the broader market weakness, the beginning of the week offered an important development for the artificial intelligence industry.
Anthropic, the developer of Claude and Claude Code, reportedly filed for an initial public offering on the Nasdaq under the ticker ANT.
The company was said to be targeting a valuation between $1.5 trillion and $2 trillion, potentially establishing the largest stock market debut in history.
Its filing indicated approximately $16 billion in revenue during the first half of the year, representing growth of roughly fourteen times compared with the corresponding period a year earlier.
The company also reported substantial losses, although a significant portion was reportedly associated with accounting adjustments rather than direct cash expenses.
The announcement initially encouraged investors, lifting semiconductor stocks by almost 3% and helping the Nasdaq lead a broader market rally on Monday.
However, enthusiasm proved short lived.
As the week progressed, attention shifted away from Anthropic's rapid expansion toward the enormous infrastructure costs required to support increasingly powerful AI systems.
The contrast was striking. Investors initially celebrated the growth of a leading AI developer, only to sell shares in the companies financing much of the computing infrastructure behind the industry.
Anthropic's anticipated November 17 listing now approaches against a more challenging market backdrop.
Supporters of the AI sector believe a successful offering could demonstrate continued investor confidence in the industry's long term potential. More cautious investors, meanwhile, remain focused on whether the revenue opportunities can justify the vast financial commitments being made across the technology sector.
Monetary policy developments outside the United States also attracted significant attention, particularly in Europe and Japan.
The European Central Bank maintained its deposit rate at 2.5%, pausing after two interest rate increases earlier in the year.
The decision came despite Eurozone inflation reaching 3.8%, significantly above the ECB's 2% objective.
However, the policy announcement was overshadowed by an unexpected development involving ECB President Christine Lagarde.
Lagarde announced plans to leave her position on February 7, 2027, earlier than previously anticipated, without providing a specific explanation for her departure.
The news introduced additional uncertainty into the European monetary policy outlook at a time when several economies were already experiencing significant fiscal and political challenges.
France remained particularly vulnerable to investor concerns, with its ten year government borrowing costs recently exceeding 5% for the first time since 2002.
Ongoing political tensions and social unrest further complicated the country's economic outlook.
In Asia, the Bank of Japan also chose to leave interest rates unchanged, maintaining its benchmark rate at 1.25%.
Nevertheless, Japanese policymakers indicated that another increase could be considered in December, reflecting continued concerns about inflation and currency stability.
The relatively restrictive message offered some support to the Japanese yen, which had previously experienced substantial pressure.
Taken together, the decisions highlighted a broader challenge facing global financial markets. Major central banks remain reluctant to ease monetary conditions while inflation pressures persist, even as investors become increasingly sensitive to economic uncertainty and expensive borrowing costs.
The week's developments demonstrated how quickly financial market sentiment can change when expectations surrounding artificial intelligence collide with financial reality.
Technology companies remain at the center of global investment strategies, but the market is becoming increasingly selective. Strong revenue growth, sustainable profitability and disciplined capital allocation are beginning to matter more than ambitious spending commitments alone.
At the same time, elevated oil prices and geopolitical instability continue to threaten progress on inflation, limiting the flexibility available to central banks.
Looking ahead, investors will closely monitor upcoming corporate earnings, developments in the Middle East and the next round of economic data for clearer signals about the direction of interest rates.
With the Nasdaq moving closer to correction territory and expectations of another Federal Reserve rate increase strengthening, volatility could remain elevated.
The central question for markets is no longer simply how quickly artificial intelligence can expand, but whether the companies financing that expansion can deliver returns large enough to justify its unprecedented cost.
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