AI borrowing binge rattles US markets

The world's richest companies can no longer rely on their massive cash piles alone to stay in the artificial intelligence race and have suddenly started borrowing massively in a shift that is sending repercussions across the world.

Rising US interest rates, including on the Treasury bonds that anchor the global economy, are sending tremors through the financial world, and some analysts point to the AI borrowing bonanza as one of the culprits.

From next to nothing in 2024, tech sector borrowing has reached around $500 billion in the nine months since January, as Google, Meta, Amazon, Microsoft and others raise debt hand over fist to finance the chips, servers and data centers that power AI.

Goldman Sachs expects a further ramp-up in 2027, to $1.2 trillion.

"This is not something that we've seen before," said Chris Della Fave, senior vice president at fundraising advisory firm Post Oak Group, who estimates that AI now accounts for 25 percent of all corporate bond issuance, up from 4 percent two years ago.

In inflation-adjusted terms, the AI sector is expected to borrow more this year than US cable operators did to build out the entire internet, or than railroad companies did during the 19th-century US rail boom.

So far, investors have eagerly snapped up the chance to lend to the tech giants, but they have demanded returns that would have been unthinkable for such blue-chip companies not long ago.

Even Meta has had to offer more than 7 percent a year, while riskier cloud data center specialists have gone above 9 percent.

The impact reaches well beyond the companies building AI -- their debt is even starting to crowd out demand for the US government bonds that anchor the financial system.

An investor who might otherwise buy a US Treasury bond "might decide to buy Microsoft" instead, said Mark Malek, chief investment officer at Siebert Financial, referring to the tech giant's bonds.

That shift pushes up the rates Washington pays to borrow, he explained.

This adds to the other force driving up US borrowing costs: inflation, fueled by the war against Iran and high energy prices.

The interest rate on 10-year US government bonds -- Wall Street's benchmark and widely seen as the most important number in global finance, setting the tone for everything from mortgages to car loans -- is now above 5.30 percent, its highest level since 2002.

Adding to the volatility, hedge funds had piled into US government bonds like never before, holding 7 percent of all those in circulation at the end of 2025, though that share has since fallen.