Capital Ideas^™ 
Investment insights from Capital Group

Like many transformative technologies, artificial intelligence (AI) is driving an investment wave of historic proportions. For example, estimated capital expenditures (capex) among the five major U.S. hyperscalers — Alphabet, Amazon, Meta, Microsoft and Oracle — in 2026 and 2027 dwarf previous periods of capital-intensive technological advancements such as the Manhattan Project, the Apollo moon landing and the internet buildout.   

Meanwhile, several AI-related stocks have been on a tear, with companies like Dell Technologies, Nvidia and Micron Technology generating cumulative price returns of 925%, 986% and 1696% over the past five years, respectively, as of August 31. With this success, however, concentration risk has developed in equity markets as AI companies have come to represent a much larger percentage of the market capitalization of the S&P 500 Index and the NASDAQ 100. 

Financing the AI buildout has led to a dramatic increase in debt issuance in public and private markets. In the investment-grade (IG) market, for example, the five major hyperscalers mentioned above have issued US$240.7 billion in debt year-to-date as of August 31, with US$66 billion issued in non-dollar currencies. If we add U.S. dollar issuance from SpaceX and Nvidia, U.S. dollar issuance reaches US$224.5 billion and total issuance across currencies jumps to US$290.7 billion. To put that in perspective: The total value of all 10-year U.S. Treasury bonds issued in 2026 as of August 31 was US$321 billion – only modestly higher than the combined issuance of the companies mentioned above.

While most issuance in the IG market has consisted of senior unsecured debt, the IG market has also produced bespoke, structured finance issues that companies have engineered to support the construction of large data centres. For example, the largest single‑tranche bond issue in terms of dollar value in the U.S. IG market belongs to Beignet Investor LLC, a holding company created by Blue Owl Capital to fund the construction of a 2.1-gigawatt Meta data centre campus in Louisiana. Due to the public-private nature of the offering, these bonds are not index-eligible, yet they are very liquid securities, thus reflecting the broad acceptance that structured finance issues have gained in the IG market.

Market demand has largely absorbed AI debt supply

Despite the record level of AI debt issuance over the past three years, market demand for U.S. IG bonds has largely absorbed this supply. In fact, based on the Bloomberg U.S. Corporate Index, corporate bond spreads ended August at 78 basis points — the same level at which they began 2026. 

This demand has consisted of several components. First, the general rise in U.S. Treasury yields since the end of 2021 has contributed to U.S. IG yields mostly trading above 5% since the second half of 2022. In turn, these higher yields have attracted more inflows as investors have looked to U.S. IG bonds to provide portfolio income.

The annuity market has provided another source of demand. In the U.S., an aging population and a growing cohort of retirees have helped support demand for investment vehicles that provide consistent income. And while not all of this demand has found its way to the U.S. IG market, a large portion of annuity assets are invested there. Within this environment, LIMRA (the Life Insurance Marketing and Research Association) reported in July that annuity sales had remained above US$100 billion for the eleventh quarter in a row.

Finally, foreign demand for U.S. IG bonds has grown steadily since 2021, especially among private sector investors. Net foreign inflows reached US$448 billion for the rolling 12-month period ending on June 15, 2026, the highest level since 2007. 

Meanwhile, U.S. IG yields continue to look attractive in the context of lower interest rates in other developed markets. Given that dynamic and the relatively funding-cost-insensitive nature of hyperscaler debt issuers, we expect that the market will show continued demand for AI debt, albeit at potentially wider spreads as issuer concentration limits come into greater focus over time. 

The impact of AI issuance on spreads

As of the end of August, U.S. IG spreads have remained unchanged in 2026 (based on the Bloomberg U.S. Corporate Index), but spreads for 10+-year hyperscaler bonds and other AI-related issuers have widened. 

In our view, this widening has been driven by high current issuance and the fact that the market expects future issuance to rise even higher. In the last four months of 2026, for example, we expect that the five major hyperscalers will issue more than US$25 billion in additional debt. Beyond that, we anticipate that in 2027 and 2028, total issuance for the five major hyperscalers in the U.S. IG dollar market will likely be between US$100 billion and US$200 billion. We also believe that AI spread widening reflects concerns that the revenue that AI issuers will eventually generate may disappoint investors’ expectations and weaken these companies’ fundamentals.

To some extent, we share these concerns. While these companies generate substantial amounts of operating cash flow from their existing businesses, consensus forecasts indicate that in 2027 and 2028, the upfront cost of their AI investments will exceed these figures. Although estimates indicate that operating cash flow will turn positive in 2029, whether these companies will eventually be able to generate enough revenue to justify their massive AI investments remains uncertain.

Finding opportunities within an array of options

Although the proliferation of AI debt has created an array of options for investors, we’re focused on narrowing that range to identify bonds that offer strong upside potential with limited downside risk. Generally speaking, we’re concentrating on liquid, on-the-run securities that allow us to take advantage of relative value opportunities as they evolve in the marketplace. More specifically, we favour AI issuers with diversified business models and those that provide a high degree of fungibility in their infrastructure.

When a company has a highly diversified business model, we think they have much greater potential to generate the extraordinary amount of revenue that’s necessary to fund their AI investments directly or to issue equity or high-quality bonds that will help fund those investments. On the other hand, AI companies with less diversified business models, such as those that are developing advanced large language models or niche AI applications, may be less attractive given their potentially higher degree of risk.

Fungibility is also an important consideration. In the AI infrastructure market, fungibility is generally defined as the ability to repurpose infrastructure (such as GPUs, clusters, and power and data centres) as necessary to meet one’s business objectives. In a rapidly evolving market, we favour companies whose infrastructure can easily pivot to host competing AI models if these companies believe that such a shift would be advantageous. In other words, if certain AI applications don’t generate sufficient revenue over time — or if more profitable applications become apparent — we think a high degree of infrastructure fungibility gives AI issuers the ability to remain adaptive in a highly competitive and uncertain business environment.

In terms of our broad portfolio positioning, we’re modestly overweight bonds issued by select hyperscalers and investment-grade issuers that are focused on building data centres. This positioning reflects our confidence that these companies can generate meaningful AI-related revenue while balancing the risk of continued heavy debt issuance. We also favour select industrial suppliers, including companies that provide power generation and infrastructure equipment. In our view, these companies benefit from AI-related infrastructure demand without necessarily carrying the same financing and contingent-liability risk as hyperscalers. We have less exposure to semiconductor-related issuers because these companies are taking on additional balance sheet risks to facilitate their customers’ chip purchases, among other reasons.

Broadly speaking, each of the bespoke structures discussed earlier (such as special purpose vehicles or “SPVs”) has deal-specific covenants and provisions, some of which may be unusually complex from the bondholders’ perspective. Given the nature of the SPV structures that have been issued in the 144A format this year, we are taking a very selective approach and evaluating each structure individually. We tend to favour structures with lease terms and amortization profiles that are sufficiently strong to consider valuing the SPV relative to the tenant or ultimate credit backstop. When deciding whether to participate in a transaction, we assess the opportunity carefully across a spectrum of construction risk, casualty risk and tenant lease termination provisions, among other factors.   

Remaining cognizant of risk

The AI buildout is offering investors an opportunity to participate in one of the most extraordinary investment booms in history. Still, we remain cognizant of the fact that at this point, AI investments vastly exceed AI revenues. And while AI revenue is growing quickly, there’s still no guarantee that it will eventually meet investors’ high expectations. In the fixed income market, we believe that AI issuers will generally be able to meet their payment obligations. In addition, spread widening in these issuers has started to provide attractive relative value opportunities. That said, given the amount of AI debt that companies have already issued and the amount that we expect them to issue going forward, we remain appropriately cautious as we seek to balance concentration risk and long-term expected returns. AI debt opportunities are in many ways compelling, but patient, fundamentally sound investing is still essential.