A single number is now the line separating calm markets from a reckoning for artificial intelligence stocks: 5% on the 10-year Treasury yield.
Wall Street has largely shrugged off this year’s surge in borrowing costs – but that tolerance may have a ceiling.
The benchmark yield surpassed 5% on September 15th, a 19-year high last matched in 2007, before slipping to about 4.94% by Thursday.
Ruchir Sharma – chairman of Rockefeller International – says a clear break above that level would “pose a problem for equity markets in general and the AI trade.”
He views the US 10-year note as “the most important asset in the world” given it’s the anchor for auto loans, mortgages, and corporate borrowing costs alike.
Why higher 10-year yield would hurt AI stocks
Higher yields raise the discount rate applied to future corporate earnings, and that tends to hit long-duration, high-growth stocks the hardest.
In simple terms, the more a company’s valuation depends on profits expected years from now, the more those future earnings are worth less when interest rates rise.
That precisely is the profile of most AI stocks as their valuations rest on earnings still years away.
The exposure compounds as corporate financing shifts underneath the sector. Mega-cap AI names are increasingly tapping the bond market to fund “infrastructure buildouts” as capital expenditures outpace free cash flow, making their equity more directly linked to the cost of debt.
Goldman Sachs said this week that rising AI infrastructure spending and heavy government borrowing are increasing competition for capital, pushing up bond yields and the cost of funding even as corporate earnings remain resilient.
What’s driving the 10-year yield higher?
Three forces are pushing rates higher.
The US central bank raised its benchmark rate by a quarter point on Wednesday, lifting the federal funds target range to 3.75%–4.00% – its first hike since 2023.
Chair Kevin Warsh also pointed to inflation running near 3.4% to 3.7%, well above the Fed’s 2% target for a fifth straight year.
Energy costs are adding to that: Brent crude has traded above $100 per barrel due to the Iran war, pushing diesel prices to record levels.
And the government’s borrowing needs are growing: federal debt has passed $40 trillion – leaving the bond market with far less spare capacity than it had in the 1990s.
Significance of the 5% yield
Ruchir Sharma’s research shows the stock-bond relationship changes character above 5%: instead of offsetting each other, stocks and bonds start moving together – and above roughly 5.25%, stocks have historically fallen outright.
That gives investors a specific number to watch rather than a vague sense of rate anxiety.
One buffer remains, though: Sharma notes that corporate balance sheets are healthier now than in the 1990s, reducing the odds of a repeat of that decade’s stress.
But if the 10-year settles above 5% rather than merely touching it, the market’s willingness to reward AI spending on faith alone will be tested against the price of borrowing to fund it.
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