What Google’s 100-Year Bond Means For Alphabet Stock Investors

Alphabet, the parent company of Google, dipped into one of the bond market’s stranger corners this week.

The company sold a 1 billion British pound century bond, about $1.37 billion in U.S. dollars, with a 6.125% coupon as part of its plan to spend $185 billion this year building out artificial intelligence infrastructure. The deal came alongside $20 billion of additional Google debt issued earlier in the week. Demand ran hot for the Methuselah bond. Investors placed roughly 10 billion pounds of orders for the 1 billion pound bond. Alphabet’s century bond lands in the middle of an AI borrowing boom. Together, Amazon, Microsoft, Meta, Alphabet and Oracle tapped debt markets for $121 billion in 2025 as data-center spending accelerated.

Century bonds aren’t new, but they’re also not common. Forecasting interest rates, creditworthiness and competitive dynamics even a decade ahead stretches the imagination, and a century multiplies that uncertainty. A 100-year promise simply feels more conceivable at the sovereign level, where institutions can span generations. Corporate issuers face a harder test. Industries change. Technology moves fast. Entire business models fade away. Hard data on how long companies survive is scarce, though one proxy comes from the S&P 500. A 2017 study by Innosight found the average company stays in the index for about 20 years (it was 35 years in the 1960s), a measure of how long firms remain competitive enough to matter in the market.

That context makes the search giant’s deal stand out. No technology company has issued a century bond since Motorola did so in 1997, back when flip phones ruled and dial-up internet hummed in the background. The speed of disruption makes a 100-year promise feel almost philosophical.

One way to read the move is as a signal of durability to the market, says William Goetzmann, professor of finance at the Yale School of Management, though investors still have to ask whether any firm, but especially a tech one even with a pristine balance sheet and $3.76 trillion market cap, “will be around” long enough to justify the investment horizon.

Beyond the symbolism, the structure itself offers clear financial benefits.

Issuers gain clear advantages. A century bond locks in financing for generations and pushes refinancing risk far into the future. Goetzmann says long-duration buyers such as insurers seek assets that match their liabilities, which creates steady demand for ultra-long bonds as a risk management tool. Investors gain higher yields and a rare long-dated asset.

These securities feel unusual today, even though history shows otherwise.

Goetzmann notes that in the 19th century, perpetual bonds and very long maturities were common, especially during the railroad boom when financing stretched across generations. Long-dated debt aligned with infrastructure projects that produced steady income streams over decades and reduced the need for frequent refinancing.

That history sets up the question behind the table below. Since 1990, U.S. companies have issued at least 38 century bonds. Only 17 of those issuers still trade as public stocks today. The rest disappeared through bankruptcy, mergers or buyouts. Among the surviving issuers, measured by whether their stock beat the S&P 500 after issuing the bond, the results land almost exactly down the middle. Eight of the 17 beat the S&P 500 after issuing their century bond, measured on a total return basis that includes dividends. Nine lagged.

A few names stand out on the upside. Cummins, maker of diesel engines, ranks among the strongest performers, helped by steady demand tied to trucking, power generation and global infrastructure spending. Caterpillar also delivered strong excess returns, riding long cycles in construction, mining and energy that rewarded patient shareholders. Durable industrial franchises mattered far more than the maturity date on a bond.

The laggards tell a different story. The Walt Disney Company trails the index by a wide margin since its century bond sale, reflecting heavy spending and a media landscape reshaped by streaming economics. Apache Corp, a Texas-based oil company, also underperformed as commodity cycles and capital intensity weighed on returns.

Those figures still overstate the success rate.

Survivorship bias plays a role. Several recent century bond issuers vanished along the way. JC Penney sold a $500 million century bond in 1997, filed for bankruptcy in 2020 and now operates privately. An auction tied to default protection at the time implied some of its debt was worth as little as 0.125 cents on the dollar, a 99% haircut for creditors. Others including Anadarko Petroleum, BellSouth and Union Carbide were acquired, often reflecting pressure to scale or adapt as industries shifted.

Still, a company leaving the stock market doesn’t erase its debt. In acquisitions, century bonds remain outstanding and become obligations of the buyer. Bankruptcy follows a legal process that determines recoveries. Equity, however, can go to zero.

What happens after issuance tells one story. The way these bonds come to market tells another.

Goetzmann notes that financial markets move in clusters. Once one issuer successfully brings an unusual security to market, others follow after investors grow comfortable with the structure. That pattern appears repeatedly in the history of century bonds, which arrive in waves rather than a steady stream. Alphabet’s deal could serve as a test case.

All of this frames how to read the table below. Corporate century bonds remain rare, and their meaning for shareholders is unclear. Some issuers flourished. Others struggled. Alphabet’s deal looks small relative to its broader capital spending and may serve as a test of investor appetite for ultra-long financing. Finance rewards precedent. If demand holds, the next century bond may arrive sooner than expected.