Big Tech taps Europe for €40 billion

About €40 billion in bonds sold by America's biggest tech companies now sit in European investors' portfolios. That is roughly 1% of the main euro corporate bond baskets that investors track, and about 10% of all new euro corporate bonds sold this year (ECB). Four ECB analysts warned on Sunday that if this share keeps growing, it could push up borrowing costs for European companies competing for the same money. Nothing has broken yet. But the mechanism they describe deserves attention.

Why borrow euros to spend dollars?

Alphabet, Amazon, Meta, Microsoft and Oracle earn almost all their revenue in dollars. Yet they are selling more and more bonds in euros. The reason is arithmetic: the ECB's interest rates sit below the Federal Reserve's. These companies borrow in euros, then use a financial contract called a currency swap to convert those euros into dollars. The result is they end up paying less than if they had borrowed dollars directly in the US (Morningstar). The cash goes to data centres, AI chips and energy infrastructure, overwhelmingly on American soil (ECB).

The pace is picking up fast. The ECB says the hyperscalers' share of these so-called "reverse Yankee" bonds (dollar companies borrowing in euros) nearly doubled between 2025 and 2026 (ECB). Amazon alone sold €14.5 billion in euro bonds in a single March deal (Bloomberg). Total euro borrowing by US non-financial firms crossed €60 billion in 2026 (Reuters). That €60 billion is the annual flow of new borrowing; the €40 billion is the stock of bonds still outstanding. Both numbers are climbing.

Three ways this could raise costs for European borrowers

The ECB blog post, by Anne Duquerroy, Oana Furtuna, Imène Rahmouni-Rousseau and Lia Vaz Cruz, traces three channels (ECB, Euractiv).

Supply pressure. More bonds chasing the same pool of buyer money means investors can demand better returns. Higher yields (the interest rate a bond pays) for Amazon or Alphabet tend to drag up rates for other borrowers selling similar bonds.

Investors shifting their money. Pension funds and insurers like long-dated, highly rated bonds. Big Tech paper fits that profile. When euro-area investors bought more corporate bonds over the past year, five hyperscalers captured 15% of that increase (EUobserver). Every euro that moves toward an Amazon bond is a euro unavailable for a European corporate or sovereign issuer.

Funds buying because the index tells them to. Many investment funds track bond indices passively, buying whatever the index holds. As Big Tech's weight in those indices grows, passive funds mechanically buy more of it and less of other borrowers. Hyperscalers currently make up about 1.2% of the European investment-grade index (bonds from companies considered safe to lend to). In the equivalent US index, they already account for nearly 5% (Marketscreener). If the European share moves toward the US pattern, the mechanical rebalancing grows.

Who gains, who loses

The winners are the tech companies themselves, which get cheap funding, and the banks arranging their deals. Santander and BBVA helped place Alphabet's large euro tranche (Cinco Días). European pension funds benefit too, gaining access to long-dated paper that pays more than government bonds (EUobserver).

The likely first losers are European companies with comparable credit quality and bond maturities. They fish in the same investor pool. Government debt is a less direct competitor, since sovereign bonds serve different portfolio functions, but France plans €310 billion in medium- and long-term bond sales in 2026 (Agence France Trésor), and the European Commission has around €660 billion in common EU debt outstanding (European Commission). These borrowers share the same balance sheets of the same large institutional investors. If Big Tech bonds approach the nearly 5% index weight seen in the US, the competition for those balance sheets tightens.

The risk starts when scale changes

The ECB's own verdict is measured: "No such spillovers are evident in the euro area so far" (ECB). Goldman Sachs projects global AI investment rising from 0.9% of world GDP in 2026 to 1.4% in 2028 (Goldman Sachs). If even a fraction of that increase gets funded through euro bonds, today's manageable 1% index share will grow.

The ECB is posing a question that European pension funds, regulators and finance ministries will need to answer: how much of America's AI build-out should Europe's savers finance before European companies capture a meaningful share of the cloud revenues, chips and pricing power that AI generates?