UK Banks Face Risks From AI Market Growth and Opaque Debt

The Bank of England cautions that accelerating AI adoption is driving up both cybersecurity threats and market volatility. Credit: Getty Images

Despite strong banking resilience, the Bank of England warns that aggressive AI sector borrowing and rising cyber risks could jeopardize financial stability.

Traditional financial institutions have historically treated disruptive technological innovations with measured skepticism, prioritizing systemic safety over rapid implementation.

This prudent approach mirrors the Bank of England’s (BoE) latest warning: AI presents a growing threat to financial stability as investors heavily back the technology’s success, while simultaneously exposing banks to heightened cyberattack risks.

In its biannual assessment of risks to Britain’s financial system, the central bank notes that previously identified dangers persist. These include inflated share price valuations, elevated public debt, and risky private credit lending to businesses.

However, the BoE identifies new risks that have intensified since its last review. These include a potential stock market bubble, increased cybersecurity vulnerabilities, and the increasingly complex and opaque debt structures of AI companies.

The central bank observes that the probability of multiple vulnerabilities ‘crystallising simultaneously’ has risen. According to the report, this overlapping pressure is ‘potentially amplifying’ the combined impact on financial stability.

Stretched market valuations

For investors’ bets on AI to yield returns, the BoE states that widespread, profitable adoption of the technology is essential. This depends on the effective expansion of new infrastructure and accessible financing for the sector.

The report notes that current AI company valuations rely on earnings forecasts that are ‘highly uncertain’.

Some of the world’s most valuable companies, such as chipmaker NVIDIA, have seen their share prices surge due to heavy AI investment or strong market demand.

These valuations have become increasingly stretched, with market gains partly driven by a narrow group of tech firms. The biannual report highlights that this trend is ‘increasing market concentration in some global indices’.

A sudden shift in investor sentiment toward these businesses could trigger a sharp market correction.

“A reassessment of these prospects could trigger a fall in equity prices that might be amplified by high concentration, correlated momentum-driven positions that can exacerbate volatility as markets fall, and increased leverage,” the BoE states.

Surging share prices at firms like chipmaker NVIDIA have sparked regulatory concerns regarding highly concentrated global stock market indices. Credit: NVIDIA

Opaque debt structures threaten stability

Corporate borrowing by tech infrastructure providers has surged, creating an investment pace that is ‘unprecedented historically’.

The BoE points out additional risks from investors, including hedge funds borrowing to purchase shares, alongside AI-related companies taking on heavy debt to fund investments.

This rapid leverage growth poses a risk to financial stability due to ‘increasing complexity and opacity in debt structures’. A lack of transparency regarding how these entities borrow could worsen a financial crisis.

“Considerations around the future earnings potential for AI-related companies will also be relevant to the sustainability of these companies’ debt,” the BoE adds. If future earnings fall short of expectations, servicing this debt could become unsustainable.

The Financial Policy Committee (FPC), tasked with ensuring the UK financial system can withstand economic shocks, concluded that the financial system remains resilient and continues to support the UK economy.

Cyber risks escalate via advanced AI

Regulators worldwide are increasingly focusing on the operational impact of advanced technologies.

These risks range from those associated with frontier AI models, such as Anthropic’s Mythos, to the challenges posed by autonomous agentic systems.

Advanced AI models are ‘increasingly capable’ of launching cyberattacks at a larger scale, driven by ‘rapid progress’ in cutting-edge AI since the last financial stability report was published in December.

This technological advancement presents a ‘significant increase’ in risks to financial stability.

It requires firms and authorities to reassess whether the resilience of key technology providers is adequate.

In the report, the BoE notes it remains unclear whether improved AI strengthens attackers or defenders of financial systems. However, it likely necessitates more frequent software updates by financial firms, which themselves carry a risk of operational disruption.

Sarah Breeden, BoE Deputy Governor. Credit: Bank of England

Need for bespoke AI regulation

The rise of autonomous technologies has prompted senior central bankers to call for entirely new regulatory frameworks.

Sarah Breeden, BoE Deputy Governor, signaled the need for tailored AI regulation to manage risks posed by increasingly capable agentic systems.

“Our frameworks were not built to contemplate autonomous agents, and relying on a human in the loop for all agent actions is unlikely to be realistic,” Sarah states.

The FPC also questioned the basis for anticipated economic benefits from using the technology, noting uncertainty regarding the scale and timing of future productivity gains. It remains unclear whether companies can consistently profit from AI applications.

However, the FPC adds that AI has the potential to boost productivity across various sectors. The technology could still support long-term economic growth, having already contributed to growth in some regions.