Citadel Securities just dropped a number that's reshaping how Wall Street thinks about AI infrastructure. Half a trillion dollars. That's how much debt chipmakers and AI companies could issue by 2028 to bankroll the processors running data centers worldwide. Not next year. Not in five years. By the end of 2028.
The scale here matters. This single sector would claim more than 5% of the entire Bloomberg US high-grade bond index, according to Jeff Eason, Citadel's head investment grade analyst. Put differently, one industry vertical could consume a sixth of the entire investment-grade debt market's annual issuance capacity. Most of this borrowing would mature within three to five years, tracking the short shelf life of cutting-edge AI chips that become obsolete fast.
The debt burden nobody saw coming
Global markets have already absorbed around $570 billion in AI-related debt. Amazon, Microsoft, and Google have been the heavy lifters here, issuing $60 billion just since 2025 in shorter-dated US debt. But that's just the warm-up act. Citadel estimates chipmakers alone could hit $250 billion in borrowing during 2028 alone, dwarfing what hyperscalers have done so far.
The real pressure is coming from AI developers burning cash faster than they generate it. Anthropic grabbed a $35 billion financing package earlier this year specifically to buy Google's custom processors. OpenAI and similar shops are doing the same, issuing debt hand over fist to keep compute flowing while they chase profitability. These companies run negative cash flow by design, betting that scale eventually flips them profitable. Until then, they need capital markets to stay open and hungry.
Who pays when the bill comes due
Eason thinks his $500 billion forecast might actually be conservative. As AI infrastructure spending accelerates, the real number could run higher. That creates a structural problem for bond investors. To make room for this new debt supply, portfolio managers will have to shrink their exposure to traditional tech, media, and telecom names. Capital gets reallocated. Spreads tighten. The composition of corporate bond portfolios shifts overnight.
Private 144A offerings to institutional investors could absorb some of this supply, but the sheer volume means public markets will absorb the brunt. Credit spreads will move. Capital allocation across the AI industry will rewire itself. Citadel expects this wave to influence everything from portfolio construction to how credit investors think about sector rotation.
This material is for information purposes only and should not be construed as financial advice. Debt forecasts and market projections carry execution risk and market conditions can shift rapidly.
