Real bond yields hit decade-plus highs as AI debt flood reshapes global markets

The largest technology companies are reshaping global bond markets at a pace that has no modern precedent. A flood of debt issuance by AI hyperscalers — led by Amazon Amazon.com, Inc. ↘ 0.94%, Alphabet ↘ 0.12%, Meta ↘ 0.86%, and Oracle ↘ 3.65% — has pushed borrowing costs higher across currencies and continents, raising fresh concerns about the knock-on effects for equities and economic growth.

A Historic Wave of Issuance

The numbers are staggering. Those four companies alone had issued roughly $194 billion of bonds through early July, up 79% from approximately $108 billion in all of 2025, according to a Reuters analysis of LSEG data. Goldman Sachs The Goldman Sachs Group, Inc. ↘ 0.31% estimated that total AI-related debt issuance — including smaller technology firms and infrastructure providers — has approached $500 billion. Since September, the hyperscalers have more than doubled their collective U.S. dollar debt footprint to over $360 billion.reuters+2

The borrowing has spilled well beyond the U.S. dollar market. Alphabet smashed issuance records in yen, Canadian dollar, Swiss franc, and sterling-denominated bonds, while Amazon raised €14.5 billion in March in the largest-ever euro corporate bond deal, according to Reuters. The Financial Times reported that this cross-currency flood has pushed up borrowing costs in those foreign credit markets. PIMCO noted that hyperscaler debt in non-dollar currencies has reached nearly $120 billion.ft+3

Yields Flash Warning Signs

The competition for capital is reverberating through government bond markets. U.S. 30-year real yields — the inflation-adjusted returns investors demand — are near 18-year highs at around 3%, while British and German 10-year real yields sit at their highest levels in more than a decade, Reuters reported Thursday. "There's a competition for capital which is relatively unprecedented in recent times," said Vivek Paul, UK chief investment strategist at BlackRock ↘ 0.77% Investment Institute.kelo+1

Credit spreads have widened alongside the rise in yields. Columbia Threadneedle's August fixed-income monitor noted that investment-grade spreads edged wider while high-yield spreads widened more noticeably, "led by underperformance in both hyperscaler and lower-quality CCC-rated issuers". Each successive jumbo deal has pressured spreads before they stabilize, creating a pattern of supply-driven volatility.seekingalpha+1

Risks Ahead

Stock markets have so far absorbed the higher yields, buoyed by strong corporate earnings. But Matt King, founder of Satori Insights, warned that major tech companies are burning through cash and will increasingly turn to credit markets. "We expect real yields to continue rising until they choke off the borrowing which has been driving them — and the rotation into risk which has been fuelling the equity rally," he wrote.reuters+1

Ashok Bhatia, chief investment officer at Neuberger Berman, said U.S. real yields remain below the 3%-4% range where he estimates a drag on growth would materialize, "but today's level is a warning sign that growth, while currently solid at 1.5% to 2%, could start to be threatened". Barclays ↗ 0.18% strategist Max Kitson offered little hope of relief: "The structural factors underpinning these increases in yields are still there. There's no reason to think they're going away anytime soon".kelo+1