I'm LongbridgeAI, I can summarize articles.The iShares 20+ Year Treasury Bond ETF (TLT) rose 2.55% this week, its best performance since March 2025, defying hotter-than-expected inflation data. Investors shifted focus from inflation to concerns over an AI bubble, as analysts predict significant write-downs in AI infrastructure spending. This fear of slower economic growth drove demand for long-dated Treasuries, causing yields to fall and bond prices to rise, while tech stocks declined.
Wall Street spent the week watching inflation. The bond market saw a bigger shark.
Two inflation reports came in hotter than expected. That is normally the signal for bond investors to sell.
Instead, they bought long-dated Treasuries at the fastest pace in a year and a half.
The iShares 20+ Year Treasury Bond ETF (NASDAQ:TLT) rose 2.55% this week to $79.97 by Friday morning.
It is on pace for its best week since March 2025. Just nine days ago, on Oct. 7, the fund traded at $76.43, the lowest price in its history going back to 2002.
So why buy bonds when inflation is heating up? The answer is artificial intelligence.
Hot Inflation Should Have Sunk Long-Term Treasuries
On Wednesday, the Bureau of Labor Statistics said consumer prices rose 0.6% in September. That pushed annual inflation to 3.7% from 3.4%, above the 3.6% economists expected.
Core inflation, which strips out food and energy, rose to 2.6% annually, still topping the Fed’s 2% target.
Thursday’s producer price report was hotter still. Headline producer inflation soared to 6.3% year over year, the highest print since December 2022.
On a monthly basis, prices jumped 1.3%, more than double economists’ 0.5% forecast.
The first reaction followed the script. The 10-year Treasury yield briefly climbed above 5.32% after the consumer price report.
Then it reversed.
By Friday, the 10-year yield was at 5.10%, down 14 basis points from last Friday. The 30-year yield fell 16 basis points to 5.44%, after touching 5.73% last week, its highest level since 2001.
Bond prices move opposite to yields, which is why TLT rises when long-term yields fall.
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The Bond Market Is Pricing a Slower AI Boom
The selling that mattered this week hit AI debt, not Treasuries.
On Thursday, CoreWeave Inc.’s (NASDAQ:CRWV) bonds due 2032 fell below 80 cents on the dollar, with yields above 15%.
CoreWeave’s five-year credit default swaps rose to 1,194.5 basis points, a record intraday high, according to ICE Data Services data reported by Bloomberg.
At that level, the swaps imply a more than 60% chance of default within five years.
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On Wednesday, Gartner, one of the world’s largest technology research and advisory firms, estimated that AI data center operators need $8.5 trillion in cumulative revenue through 2030 to cover their spending, financing costs and a 12% return on invested capital. It forecasts no more than $3.6 trillion.
As a result, Gartner said more than $3.5 trillion of planned AI infrastructure spending is exposed to write-downs.
The chain works in steps:
- The AI buildout has become a major engine of U.S. growth.
- If lenders demand more to fund it, some projects get delayed.
- Less investment means slower growth.
- Slower growth means lower long-term yields.
"When expected activity in AI declines, yields decline," Dennis DeBusschere, analyst at 22V Research, said in a note Thursday.
Tech stocks felt it.
The Invesco QQQ Trust (NASDAQ:QQQ), which tracks the Nasdaq 100, is down 3.1% this week.
The Long End Is Doing the Work, Not the Fed
The rally was concentrated in long-dated bonds. The 2-year yield, which tracks expectations for Federal Reserve policy, slipped only 2 basis points to 4.74%.
Meanwhile, traders have stepped back from an immediate rate hike.
Fed funds futures price in a 14.9% chance that the Fed will raise rates at its Oct. 28 meeting, down from 19.5% a week ago, according to CME FedWatch.
In other words, the bond rally bets on slower growth, not cheaper money.
One Good Week After a Long Slide
Not everyone is ready to call the AI spending cycle over.
"We are nowhere near ready to write off the AI investment boom," Ed Yardeni said in a note.
He noted that Amazon.com Inc., Alphabet Inc., Meta Platforms Inc., Microsoft Corp. and Oracle Corp. are expected to spend a combined $892 billion this year and $1.1 trillion next year.
TLT is still down 8.5% since January.
One strong week does not reverse a slide in long-term bonds that began in the fall of 2024. For now, it shows bond investors fear an AI slowdown more than inflation.
Photo: Jonathan Weiss/Shutterstock
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