Markets hit the brakes on the AI trade on [day], sending tech stocks lower and triggering the biggest one-day rally in US Treasuries since March 2023. The 10-year Treasury yield dropped more than 19 basis points to 4.9591%, falling back below the psychologically important 5% level. The move came as investors shifted their focus from AI's potential upside to its hefty price tag.
That shift was most visible in interest-rate markets. Traders scaled back expectations for Federal Reserve tightening: a December rate increase was no longer fully priced in, and markets trimmed nearly a quarter of a percentage point of hikes from next year's expected path. In plain terms, investors are now betting the Fed will be less aggressive in raising rates than they thought just days ago.
Why AI spending is spooking markets
The catalyst for the selloff is growing concern about the cost of the AI boom. Building and running the data centers and chips that power artificial intelligence requires enormous capital outlays. Companies like Meta, Microsoft, and Alphabet have been spending billions on AI infrastructure, and investors are starting to question whether those investments will pay off.
This "AI reset" worry is not just about tech stocks. If companies pull back on AI-related spending, that could cool corporate investment more broadly and, by extension, slow the wider US economy. That's why the selloff has spread beyond tech: AI spending fears have also hit currencies like the Australian and New Zealand dollars, which are sensitive to global growth prospects.
The concern is also showing up in credit markets. Meta's AI spending has spooked credit markets, with the cost of insuring its debt hitting a record. That's a sign that bond investors are worried about the financial strain of AI investments, even for the biggest tech players.
Bonds rally as growth worries replace inflation worries
When growth worries replace inflation worries, government bonds often rally. Investors expect lower future interest rates, and they look for a steadier place to park cash. That's exactly what happened on [day]: as stocks fell, Treasuries caught a bid, reviving the classic "stocks down, bonds up" pattern.
This is a notable reversal from much of the past year, when stocks and bonds often moved in the same direction—both falling as inflation and rate fears dominated. The return of a negative correlation between stocks and bonds is significant for investors who use bonds as a hedge in their portfolios.
Nomura's Charlie McElligott summed it up by saying bonds were "working as your hedge again." If that relationship sticks, it changes how diversified portfolios absorb tech-led selloffs: the protection comes from falling yields, and the 5% line becomes a practical threshold for hedging behavior, not just a headline number.
What it means for investors
For everyday investors, the key takeaway is that the AI trade is no longer a one-way bet. The stocks that have powered market gains for years are now facing questions about whether the spending is sustainable. That doesn't mean AI is a bust—it means the market is starting to price in more risk.
The drop in Treasury yields is also a reminder that bonds can still do their job. When stocks fall, high-quality government bonds can provide a cushion, as they did on [day]. For investors with a mix of stocks and bonds, this is a welcome development after a period when both asset classes often fell together.
But there are still forces that could push yields back up. Oil prices have hit a five-month high after Houthi attacks in the Red Sea, and higher energy costs can feed into inflation, which would argue for higher rates. So the bond rally may not be the start of a sustained trend.
Investors will be watching several things in the coming days: whether tech earnings confirm the AI spending concerns, whether inflation data stays benign, and whether the Fed signals any shift in its stance. The Nasdaq CEO has noted that high Treasury yields are cooling the IPO market, which is another sign of how rate levels ripple through the broader economy.
For now, the message from markets is clear: the AI boom is entering a more cautious phase, and bonds are once again acting as a safety net. That's a shift worth paying attention to, even if it doesn't change your long-term plan.
