Is the AI debt bubble beginning to show signs? Analysts warn: Alphabet issuing century-long bonds may be a market "top" signal

Alphabet issues £1 billion century bonds, with strategists viewing it as another signal of excessive optimism at the end of the credit cycle. As tech giants push borrowing to new heights in the AI infrastructure race, the risks of debt-driven expansion are drawing attention.

On February 12, Wind Shift Capital CEO Bill Blain stated that, due to credit spreads at historic lows, the long-term demand for data centers is uncertain, and rapid technological change will inevitably create winners and losers in the industry. This transaction further proves that there is a bubble in the artificial intelligence market.

This is Google’s parent company’s first foray into pound-denominated ultra-long-term bonds, as part of its approximately $20 billion multi-currency financing plan. The issuance spans USD, EUR, GBP, and the first time in CHF, covering multiple maturities. According to Bloomberg, citing sources, the bonds priced on Tuesday attracted nearly 10 times oversubscription, with a coupon 120 basis points above 10-year UK bonds. Alphabet disclosed last week that its capital expenditure is expected to reach $185 billion in 2026.

Market Bubble Signals

Wind Shift Capital CEO Bill Blain believes that the £1 billion century bond issuance by Alphabet this week is the latest evidence of excessive expansion in the credit market for AI financing.

In an interview with CNBC, Blain said that while the deal was executed well and accurately targeted the structural needs of UK insurance and pension funds matching liabilities, he also warned that “in the context of credit spreads at historic lows, uncertain long-term data center demand, and accelerated technological iteration reshaping industry dynamics, the emergence of such ultra-long-term financing tools is a classic sign of a market bubble.” He added:

“If you’re looking for signs of a market top, even a perfectly executed deal like this does indeed look like one.”

As competitors like Oracle, Amazon, and Microsoft ramp up infrastructure investments simultaneously, it is expected that the total bond issuance by tech giants will approach $3 trillion over the next five years. Strategists note that issuing century bonds also helps Alphabet broaden its investor base beyond traditional lenders.

Diversifying Funding Sources

Federated Hermes London Credit Head Nachu Chockalingam said that “Alphabet’s choice to finance AI capital expenditure in the ultra-long-term GBP market aims to precisely meet the liability matching needs of UK insurance and pension funds, while also diversifying funding channels to avoid over-saturation in the dollar market.”

Muzinich & Co. Co-Head of Public Markets Tatjana Greil Castro emphasized that century bonds impose extremely high requirements on the issuer’s long-term survival and continuous innovation capability. She pointed out:

“You’re essentially betting that this company can continually reinvent itself over the next century and beyond. Even governments rarely issue such bonds.”

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