US tech giants' hidden AI debt swells 90% to $3.2tn in 6 months

US technology companies’ hidden AI-related debt swelled 90% to $3.2tn in six months, according to the article, as firms including Microsoft, Alphabet, Amazon and Meta ramp up data-center spending. The surge reflects borrowing tied to AI infrastructure that sits outside conventional debt metrics, raising questions about leverage as capex climbs. Investors will watch upcoming earnings and bond disclosures for clearer figures on these obligations and their maturities.