In a recent address, the head of the Bank for International Settlements (BIS) sounded an alarm about the rapidly intensifying competition among corporations to pour capital into artificial intelligence (AI) technologies. The chief highlighted a troubling pattern: much of the funding that is propelling this AI surge is being sourced through opaque, often hidden, debt structures. This lack of transparency, the BIS official warned, could sow the seeds of a systemic financial crisis if left unchecked.

The warning was framed within a broader historical context. The speaker, Pablo Hernandez, invoked two well‑known episodes of speculative excess—the 19th‑century railway mania and the late‑1990s dot‑com bubble—to illustrate how markets can become dangerously inflated when investment decisions are driven more by hype than by solid, underlying profitability.

In both of those earlier periods, investors rushed to fund projects that promised spectacular returns, often relying on borrowed money that was not fully disclosed or properly accounted for. When the anticipated cash flows failed to materialize, the resulting defaults and bankruptcies sent shockwaves through the broader economy. Fast‑forward to today, and a similar dynamic appears to be unfolding in the AI sector.

Companies across a wide range of industries—from finance and healthcare to manufacturing and entertainment—are racing to embed machine‑learning algorithms, generative models, and autonomous systems into their core operations. The promise of AI is compelling: higher efficiency, new revenue streams, and a competitive edge that could reshape entire markets. Yet, according to the BIS chief, the enthusiasm for AI is outpacing the realistic assessment of its immediate profit‑generating capacity. A key element of the current AI funding frenzy is the reliance on debt that is often concealed in special purpose vehicles, off‑balance‑sheet arrangements, or complex securitisation structures.

These mechanisms can mask the true level of leverage that firms are taking on, making it difficult for regulators, investors, and even the firms themselves to gauge the real risk exposure. When debt is hidden, the probability of a sudden loss of confidence—triggered by a missed earnings target, a regulatory setback, or a technological failure—rises sharply. In such a scenario, creditors may demand immediate repayment, forcing companies to liquidate assets or curtail operations, which can amplify the initial shock. The systemic risk emerges because the AI investment wave is not confined to a handful of niche players; it cuts across the entire corporate landscape.

Large multinational banks, for instance, are financing AI start‑ups and established tech firms, while sovereign wealth funds and pension schemes are allocating sizable portions of their portfolios to AI‑focused equities and bonds. If a sizable share of these institutions holds similarly opaque debt, a cascade of defaults could quickly spread throughout the financial system, jeopardising liquidity, eroding confidence, and potentially triggering a broader economic downturn.

Hernandez also emphasized that the current environment is characterised by a feedback loop between market expectations and corporate behaviour. The more investors talk about AI as the next growth engine, the more companies feel pressured to announce AI initiatives, often before they have a clear roadmap for monetisation. This creates a self‑fulfilling prophecy where the narrative of AI‑driven growth fuels capital inflows, which in turn inflates asset prices and encourages further borrowing.

The danger lies in the fact that many of these AI projects are still in experimental or early‑stage development, meaning that the timeline for achieving profitability can be long and uncertain. To mitigate these risks, the BIS chief called for greater transparency in corporate financing, especially regarding AI‑related expenditures. He urged regulators to demand clearer disclosure of debt structures, enforce stricter reporting standards for AI investments, and monitor the concentration of AI‑linked leverage across sectors.

Additionally, he suggested that firms adopt more prudent budgeting practices, aligning AI spend with realistic revenue forecasts rather than speculative hype. The speech resonated with policymakers who have been grappling with the challenge of balancing innovation encouragement with financial stability. While AI holds transformative potential, the BIS warning underscores that unchecked enthusiasm, coupled with hidden borrowing, could undermine the very economic foundations that enable technological progress. In summary, the BIS chief’s message is a cautionary one: the AI capital‑expenditure race, if financed through opaque debt, poses a serious systemic threat.

By learning from historical bubbles—where hype outstripped real earnings and hidden leverage magnified the fallout—stakeholders can adopt more disciplined, transparent, and risk‑aware approaches to AI investment. This will help ensure that the benefits of artificial intelligence are realised without jeopardising the stability of the global financial system.