The US 30-year bond yield has held above 5% for the longest stretch since the start of the financial crisis, driven partly by rising competition from AI-related corporate debt issuance. Technology companies racing to fund artificial intelligence infrastructure are flooding markets with new bonds, absorbing investor demand that might otherwise flow into government securities.

This supply dynamic coincides with persistent inflation concerns and the Federal Reserve's higher-for-longer rate stance. The Treasury's own elevated borrowing needs to fund fiscal deficits have further pressured long-duration paper. Investors now demand higher term premiums to hold 30-year debt amid uncertainty over monetary policy and fiscal trajectories.

The yield milestone reflects a structural shift where private-sector AI investment competes directly with sovereign funding. Corporate issuance from mega-cap tech firms has surged to record levels, while foreign demand for Treasuries shows signs of waning. Market participants watch whether yields sustain above this psychological threshold or retreat if economic data softens.