US Tech Giants’ AI Bond Boom Raises Euro Zone Borrowing Risks

U.S. technology giants are rapidly increasing their presence in the euro zone bond market as they seek funding for massive artificial intelligence investments, potentially raising borrowing costs for companies and governments, according to a European Central Bank blog post.

Major hyperscalers including Alphabet, Amazon and Microsoft could spend as much as $1 trillion on AI-related infrastructure and development by 2028, according to credit analysts. The scale of these investments is pushing cash-rich technology companies to increasingly rely on global debt markets for additional financing.

Big Tech companies currently have around €40 billion ($46 billion) in outstanding euro zone bonds. While that represents a relatively small portion of the overall market, these firms now account for nearly 10% of gross new bond issuance. Amazon and Google parent Alphabet have emerged as the euro zone’s largest corporate bond issuers this year.

The ECB blog warned that growing Big Tech debt issuance could lift financing costs across multiple sectors. Increased competition for investor capital may also spill over into sovereign and supranational bonds, potentially increasing borrowing costs for European governments and institutions.

Investor capacity could become particularly important as markets prepare for even greater AI-related bond supply. If demand fails to keep pace with issuance, yields may need to rise to attract buyers, creating broader pressure across European credit markets.

Passive investment strategies could further intensify the crowding-out effect. Funds tracking bond indexes may automatically allocate more capital to technology debt as its weighting grows, potentially reducing demand for bonds issued by other corporations and governments and affecting credit spreads.

The ECB blog also highlighted potential credit risks surrounding Big Tech borrowing. Its authors questioned whether the high credit ratings currently assigned to major technology companies adequately reflect the risks associated with rapidly rising debt levels.

Rating agencies may be relying heavily on assumptions about future revenue growth and leverage that could ultimately prove too optimistic, the authors said.

Although the blog does not necessarily represent the ECB’s official position, it underscores growing concerns that the global AI investment boom could reshape euro zone bond markets as technology companies increasingly turn to debt to finance unprecedented spending.