Fact Check Team: How much of the stock market is propped up by the AI boom?
NEW YORK, NEW YORK – OCTOBER 21: Traders work on the floor of the New York Stock Exchange during morning trading on October 21, 2026 in New York City. Stocks continued to rise at opening a day after the Dow Jones closed over 500 points amid a release of the latest round of earnings reports. (Photo by Michael M. Santiago/
WASHINGTON (TNND) —Artificial intelligence is helping fuel the stock market’s growth. But as technology companies pour hundreds of billions of dollars into AI infrastructure, investors are increasingly questioning whether those investments will pay off.
New reporting from The New York Times on Friday highlights the growing financial risks behind the AI boom, including the enormous spending commitments made by some of the world’s largest technology companies.
The stakes extend beyond Silicon Valley. A relatively small group of major technology companies now accounts for a substantial share of the overall stock market’s value.
AI stocks are driving a significant share of market gains
An analysis of 47 AI-related stocks found that they accounted for about 60% of the S&P 500’s gains in the period examined. During the first half of 2026, those stocks accounted for roughly 75% of the index’s gains.
Thatconcentration means the broader market’s performance has become increasingly tied to the fortunes of companies benefiting from AI investment.
The market is also heavily concentrated in a handful of major companies.The 10 largest companiesaccount for roughly 40% of the S&P 500’s total market value.
Among them are Nvidia, Microsoft, Alphabet and Amazon, all of which have major stakes in the development and expansion of artificial intelligence.
But the momentum has not been consistent. AI-related stocks began weighing on the S&P 500’s performance in the second half of the year, as investors reassessed the outlook for the sector.
Big Tech is spending hundreds of billions on AI
The spending behind the AI boom is staggering.
Amazon, Microsoft, Google and Meta are on track to spend more than $720 billion this year on data centers and other capital expenses, according to the October 30 New York Times report. That’s roughly three times what the four companies spent just two years ago. They are also expected to spend even more next year.
Theinvestments include computer chips, servers, data centers and the infrastructure needed to power increasingly complex AI systems.
But the spending is beginning to weigh on companies’ finances. The Times reported that most of the companies are spending more cash on data centers than they generate from operating their businesses.
Investors are particularly concerned about free cash flow, which measures how much money a company has left after paying its operating expenses and capital investments.
The concern is that companies could continue pouring money into AI infrastructure without generating enough revenue to justify the cost.
There are signs that the investments are producing growth. Amazon’s cloud computing division, for example, reported a 39% increase in sales to $46 billion. Microsoft also reported strong growth in its cloud and AI business. But investors are looking for evidence that those gains will translate into sustainable profits.
Are we seeing another dot-com bubble?
The growing uncertainty has renewed comparisons to the dot-com bubble of the late 1990s, when investors poured money into internet companies amid expectations of enormous future growth.
There are important differences. Today’s largest technology companies are established businesses with substantial revenue, existing customers and significant cash flow.
But that doesn’t mean they are immuneto a market correction.
If demand for AI fails to meet expectations, companies could scale back investments, potentially affecting everything from semiconductor manufacturers to data center construction.
A sharp decline in technology stocks could also spill over into the broader market because of how much value is concentrated in a relatively small group of companies.
On Friday, concerns over AI spending and disappointing technology earnings contributed to a sharp market sell-off. The Nasdaq fell 2.9%, while the S&P 500 dropped 1.8%.
The question facing investors is not simply whether artificial intelligence will change the economy. It’s whether the companies spending hundreds of billions of dollars to build it will generate enough revenue and profits to make those investments worthwhile.
For now, the AI boom remains a major driver of the stock market. But the growing cost of that bet is raising questions about how sustainable the rally really is.
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