Investor appetite for AI-related corporate bonds has dropped significantly as Meta and Microsoft prepare to release their latest earnings reports this week. Demand for these bonds, which soared earlier in the year, has now fallen sharply from nearly five times oversubscribed in February to under twice covered by July, signaling a notable cooling in the market.

Big Tech's relentless borrowing spree, driven by massive investments into AI infrastructure, has led to a staggering projected debt pipeline of $570 billion for 2026. Amazon’s recent $25 billion bond issuance required offering extra yield just to attract interest, with order coverage lowering to 2.5 times, revealing signs that the bond market’s enthusiasm is waning.

Meta set a record last October with a $30 billion investment-grade bond, the largest for non-acquisition purposes at the time. Alongside Microsoft, Alphabet, and Oracle, these giants have leaned heavily on debt markets to fund their AI ambitions. However, bond spreads for companies like Meta and Alphabet have widened by up to 0.16 percentage points recently, while overall investment-grade spreads remain steady. This divergence hints at growing investor skepticism toward AI-related debt.

All eyes are on the upcoming earnings reports from Microsoft and Meta, especially regarding their capital expenditure outlooks. Should either company indicate increased spending, bondholders may demand higher yields or show less enthusiasm. Conversely, signs of controlled spending or tangible AI revenue growth could help calm jitters.

For investors in the AI supply chain from chipmakers to data center operators these earnings will act as a critical barometer. The entire ecosystem depends on sustained, aggressive capital deployment from Big Tech. The shift in investor sentiment from exuberance to caution threatens to impose discipline on these spending plans, with ripple effects likely to spread through related industries.

No major credit defaults have occurred yet, but the mood in AI bond markets has shifted decisively. This week’s earnings announcements will reveal whether this caution is temporary or marks a turning point for AI-driven debt financing.