It was a rough week for technology investors. US chip stocks suffered their worst day since June, as worries grew that the massive, debt-funded spending on artificial intelligence won't deliver profits quickly enough. The jitters didn't stay in the US—they spread to Asian markets and even into company bonds, as investors questioned whether the AI boom is built on solid ground.
Why the sudden fear?
The AI boom has been a major driver of stock market gains over the past couple of years. Companies like Nvidia, Microsoft, and Alphabet have poured billions into data centers and AI infrastructure, betting that the technology will transform industries and generate huge returns. But that spending comes with a catch: much of it is financed by borrowing. And if the profits don't materialize as quickly as hoped, those debts could become a problem.
This week, investors seemed to hit a tipping point. The selloff in chip stocks was the sharpest since June, and it wasn't just a US phenomenon. Asian tech shares also fell, and even corporate bonds—which are usually less volatile than stocks—felt the pressure. When investors get nervous about a company's ability to pay back its debts, they demand higher yields, which pushes bond prices down.
Investors run for cover
With stocks and corporate bonds looking risky, investors did what they often do in times of uncertainty: they piled into US government bonds. These are considered among the safest investments in the world, and they had their best day in over a year. The rally got an extra boost from changing expectations about interest rates. If the AI selloff slows the economy, the thinking goes, the Federal Reserve might not need to raise rates as much as previously expected. Lower rates make existing bonds more valuable, so prices rose.
This flight to safety is a classic market reaction. When fear spikes, investors sell riskier assets and buy safer ones, even if it means accepting lower returns. For everyday investors, it's a reminder that diversification—holding a mix of stocks, bonds, and other assets—can help cushion the blow when one part of the market gets hit.
Bubble or not?
The big question on everyone's mind: is AI in a bubble? The debate is heating up. Ken Griffin, the boss of hedge fund Citadel, says AI is “almost certainly” in a bubble. But Jonathan Gray, president of investment giant Blackstone, disagrees. He argues that bubbles typically form when companies build first and hope demand shows up later. With AI, he says, the problem is the opposite—demand is so strong that companies can't build fast enough.
It's worth noting that Blackstone has a roughly $200 billion data center empire, so Gray has a vested interest in talking up AI. But even those who warn of a bubble admit that frenzies often accompany genuine technological shifts. The internet boom of the late 1990s was full of hype, but it also gave rise to companies like Amazon and Google that became long-term winners. The real question isn't whether AI demand is real—it's whether the spending will pay off, and how long that will take.
Profits may back the prices
Here's a key difference from the dot-com era. Back then, tech stocks' valuations far outpaced their expected earnings. This time, it's the other way around. The combined expected earnings of seven AI giants—including Nvidia, Microsoft, and Alphabet—have grown faster than their market values since 2022. That suggests their share prices are broadly backed by real profits, not just hype.
Still, the heftier worry is about companies borrowing big to fund their AI ambitions. Nervous lenders are demanding better returns for the riskier ride, which could squeeze companies' finances and slow the AI buildout. As AI's ballooning costs push investors toward safer government bonds, the pressure on corporate borrowers is likely to grow.
What it means for investors
For the average investor, this week's moves are a reminder that markets don't go up in a straight line. The AI boom has been a major driver of returns, but it comes with real risks. If you're heavily invested in tech stocks, it might be worth checking your portfolio's balance. Government bonds, which had a rough couple of years, are suddenly looking more attractive as a safe haven.
It's also worth watching how the AI spending story evolves. If companies like Nvidia and Microsoft continue to deliver strong earnings, the selloff could be a temporary blip. But if the debt burden becomes too heavy, the fallout could spread beyond tech. As S&P 500 slips as AI spending worries spread beyond Big Tech, the ripple effects are already being felt.
Beyond AI: luxury and autos struggle
It wasn't just tech that had a rough week. Gucci's sales fell further than expected, leaving its owner Kering's shares feeling low. Gucci brings in about half of Kering's profit, so when the brand stumbles, the whole group trips too. Gucci's revenue fell 6% last quarter—double the 3% drop analysts had expected. Sales across Kering's stable slipped 1% from last year, even with Bottega Veneta, Saint Laurent, and Boucheron pulling their weight. Recent riots in Paris won't help next quarter's numbers either: four of its shops were looted. Kering's shares fell more than 10% in early trading on Friday, their steepest slide since April 2025.
Kering blamed sluggish demand in China and Japan, and it's not alone. Hermès and LVMH have been struggling too. But Kering's Friday could've been worse—like it was for Volvo Car. Shares in the Swedish automaker fell 30% in early trading after it revealed that sales in China had nearly halved from a year ago.
A bright spot: SharkNinja
It's a tough environment for consumers right now, and that's been showing up in plenty of companies' numbers. But not SharkNinja's. The maker of Shark vacuums and Ninja kitchen gadgets has actually seen its growth speed up, thanks to a steady stream of new products. The company's planned push into new international markets and a strong pipeline of upcoming products have investors optimistic. Shares are up almost 20% since September, a standout in a market where many consumer brands are struggling.
For investors, the lesson is clear: even in a tough economy, companies that innovate and adapt can thrive. But it's also a reminder that not every stock will follow the same path. As always, it pays to do your own research and consider your own financial situation before making any decisions.
