AI Debt Deluge Meets Pushback: Cover Ratio Halves to 2x

The 2026 blowout in artificial-intelligence borrowing is finally meeting some resistance. Order books on hyperscaler bonds — the same deals that were 5x oversubscribed in February — have slipped below 2x by July, per Apollo, and new-issue concessions on AI-related bonds are running around 12 basis points versus a broader IG market average of roughly 2.5 bp. Amazon’s June Canadian dollar Maple bond widened its existing 30-year debt by 20 bp once the new supply hit the tape.

The demand is still there — every one of the marquee 2026 deals cleared — but the leverage has shifted from the issuer to the buy-side, and the price of that leverage is starting to show up in spreads.

The number that anchors everything: $570 billion

Morgan Stanley now forecasts roughly $570 billion of global AI-related debt issuance in 2026. The pace through May was already $236 billion — four times the year-earlier run rate. Reuters, citing broker tallies, pegs Amazon, Alphabet, Meta and Oracle’s combined USD issuance at $194 billion through July 7, up 79% year over year, with Amazon the single largest borrower at about $57 billion. Goldman Sachs, quoted in the same report, sees the group hitting $250 billion for full-year 2026 and $400 billion in 2027.

Fold in Nvidia, CoreWeave, xAI-linked structures and the private-credit sleeve, and Fortune counts $225 billion in AI-related debt priced by midyear, up 973.7% year over year. Combined dollar-denominated hyperscaler debt outstanding has crossed $360 billion, roughly double the level of September 2025, per Quartz’s read of the IG index.

The blockbuster deals

The individual prints tell the story better than any aggregate. Alphabet’s February 2026 U.S. deal was upsized to $20 billion across seven tranches on more than $100 billion of orders, and its global raise topped $30 billion once a £5.5 billion sterling piece — with a 100-year tranche, the first century tech bond since Motorola in 1997 — closed a day later. Oracle followed in 2026 with a $25 billion offering that saw its book swell toward $155 billion. Amazon printed a C$14 billion Maple bond on June 9, the largest Canadian-dollar corporate deal ever, but at concessions of +40 bp on the 2029 tranche and +110 bp on the 2056 tranche versus Government of Canada — wide enough to move Amazon’s own outstanding curve.

Where the pushback is showing

The cleanest indicator is the coverage ratio. Apollo’s Torsten Sløk has flagged that hyperscaler bond books averaged close to 5x oversubscribed in February 2026. By July, that had drifted to under 2x. Falling coverage does not mean deals fail — a 1.5x book still clears — but it is the point at which syndicate desks stop tightening pricing during marketing and start protecting the new-issue concession.

That is exactly what has happened. Sage Advisory notes that AI-related new-issue concessions have averaged around 12 bp versus a broader IG new-issue concession of roughly 2.5 bp. And when Amazon printed C$14 billion in June, the pressure spilled into secondary — the company’s existing 30-year debt widened 20 bp in the days around the deal, per the same Sage note.

Private credit is now the escape valve

What the public IG desk cannot absorb, private credit has been quietly warehousing. The Meta – Blue Owl joint venture on the Louisiana Hyperion data-center campus closed the largest private-credit financing on record: $27 billion of A+ SPV debt plus $2.5 billion of equity, with PIMCO ($18B) and BlackRock ($3B) as anchor lenders and Blue Owl holding 80% of the equity to Meta’s 20%. That was followed by the $35 billion Anthropic AI XPV financing arranged by Apollo and Blackstone in June, and Blackstone is reportedly in talks on a second $36 billion Ironwood TPU package. CoreWeave sweetened the yield on a $2.6 billion Anthropic-linked loan in late July after investor pushback, and has now taken its total debt stack past $15 billion.

The rating agencies are watching

Moody’s laid out the arithmetic in a July report: hyperscaler capex is projected to reach roughly $785 billion in 2026 and $1 trillion in 2027. Direct debt across Microsoft, Amazon, Alphabet, Meta, Oracle and CoreWeave now totals about $460 billion, and Moody’s estimates off-balance-sheet lease and service commitments add another $1.2 trillion. The agency stopped short of a downgrade cycle but flagged what it called an eventual “reassessment of creditworthiness” if capex outstrips cash conversion.

S&P has been more direct. In July 2026 it downgraded Oracle one notch to BBB-, one step above high yield, citing the leverage impact of its AI infrastructure buildout — the first time an AI-heavy hyperscaler has been walked to the edge of the IG universe in this cycle.

What it means for the rest of IG

Hyperscaler paper is now large enough to move the whole investment-grade market. Every 30-year AI print re-anchors the long end of the IG curve; every private-credit SPV pulls dedicated buyers away from public deals; every rating action forces index-tracking funds to rethink duration and concentration limits. The pushback in July is not the end of the deal cycle — Alphabet, Amazon and Meta are all reportedly staging fresh trades into the fall — but it is the first read from the buy-side that the supply is starting to weigh on price, and that price will not be given for free.

Sources

• Forbes: Bond Investors Push Back As AI Debt Heads Toward $570 Billion
• Apollo Daily Spark: Cover ratios for hyperscaler bonds declining
• Reuters via Yahoo: Hyperscaler debt binge pushes yields
• Fortune: AI hyperscaler capex and hidden borrowing
• CNBC: Moody’s on AI spending and credit quality
• Sage Advisory: Hyperscaler debt deluge and IG spread pressure
• Global Finance: Alphabet 100-year issuance
• IFR: Oracle raises $25bn

Disclosure: This article is for informational purposes only and is not investment advice.