Big Tech bond sales surge on AI spending

The backdrop is still expensive money. The 10-year Treasury yield is around 4.6%, while the Fed funds rate sits at 3.63%, leaving corporate borrowers well above the ultra-low financing costs that dominated much of the last decade. Even so, borrowers have found strong demand for high-grade paper, suggesting investors are still willing to fund balance-sheet expansion when the names are large and the projects are tied to AI growth.

That demand has not come without pressure on credit markets. The ICE BofA US high-yield spread, tracked by the BAMLH0A0HYM2 series, recently sat near 2.67 percentage points, below recent spikes but still high enough to show that investors are being selective outside the strongest credits. The high-grade market has held up better than lower-rated debt, with ETFs such as LQD and HYG both edging lower in recent sessions as yields stay elevated and investors reassess duration risk.

For megacap tech issuers, the message is clear: the AI arms race is no longer just a capex story, it is a funding story. Recent filings from Microsoft, Alphabet and Amazon all point to heavy infrastructure investment, while Oracle has also flagged significant spending tied to data-center expansion. The borrowing wave gives those companies flexibility to keep building, but it also locks in interest expense at a time when Treasury yields are still near cycle highs.

Investors will be watching whether the August pace spills into September, when issuance typically picks up after the summer lull, and whether persistent supply starts to cheapen spreads. Any further rise in Treasury yields or signs that AI spending is outpacing near-term revenue could quickly change the tone.