Bank of England Warns That Debt, Leverage and AI Risks Are Becoming More Interconnected
Summary: The Bank of England says the probability of several financial vulnerabilities emerging at the same time has increased. Its latest assessment focuses on elevated sovereign-bond yields, leveraged activity in the gilt market, expanding private credit and growing financial and operational exposure to artificial intelligence. Britain’s banking system remains resilient, but investors should pay closer attention to liquidity, leverage and correlations between markets that previously appeared separate.
A warning about connections, not a prediction of crisis
The Bank of England’s Financial Policy Committee, or FPC, has delivered a carefully worded but consequential warning: vulnerabilities within the financial system are increasingly connected, making it more plausible that several sources of stress could emerge together.
The committee is not forecasting an imminent financial crisis. It said the UK banking system remains strong enough to support households and businesses, while financial markets have so far absorbed higher sovereign yields without serious disruption.
However, the risk environment has worsened since the FPC’s previous assessment in July. Its central concern is that pressure in government bonds, highly valued equities and riskier credit markets could become mutually reinforcing rather than remaining isolated events. The Bank’s September FPC record was published on 30 September.
That distinction matters. Markets can usually process a correction in one asset class. They become more vulnerable when declining asset prices trigger margin calls, forced deleveraging and asset sales across several markets simultaneously.
The gilt market is an important transmission channel
The British government-bond market sits at the centre of the warning.
Sovereign yields have risen internationally, tightening financial conditions for governments, companies and households. The UK’s benchmark ten-year gilt yield is near levels last associated with the period around the global financial crisis, according to Bloomberg’s report on the FPC assessment.
Higher yields are not necessarily evidence of dysfunctional markets. They can reflect changing expectations for inflation, central-bank policy, government borrowing or the compensation investors require for holding longer-dated debt.
The financial-stability concern arises when heavily leveraged investors use the gilt-repurchase, or repo, market to finance positions that may need to be unwound rapidly.
The Bank said gilt-repo dealers’ net cash lending to important non-bank financial sectors has increased from approximately £100 billion in 2023 to around £200 billion. Hedge-fund net borrowing in the gilt-repo market also remains elevated by historical standards.
Leverage can improve liquidity during ordinary trading. Under stress, however, it can accelerate losses and generate forced selling. The FPC therefore continues to emphasise measures designed to make the gilt-repo market more resilient.
AI is moving from an equity story into credit markets
Artificial intelligence was the second major theme.
The FPC noted that AI-related and semiconductor shares fell sharply in July. An unwinding of crowded, leveraged positions amplified that adjustment, producing significant losses for some concentrated investors. Market functioning nevertheless remained orderly, with no spillover into core financial markets.
The episode still provided a useful stress test. AI valuations remain dependent on ambitious expectations for future earnings, capital expenditure and adoption. A deeper reassessment could spread further as the AI ecosystem becomes more reliant on external financing.
That financing increasingly includes public debt, private credit, leveraged lending and structured products. This means an AI repricing would no longer be confined to shareholders. Credit funds, banks and other lenders could also be exposed.
Private markets themselves have grown substantially. The Bank estimates that global private-market assets under management have reached roughly $16 trillion. Private equity and private credit account for approximately $11 trillion, up from around $3 trillion a decade ago. Private equity-sponsored businesses represent about 15% of UK corporate debt and 10% of private-sector employment.
These markets provide valuable long-term finance, but their opacity, valuation practices and connections with banks and insurers can make emerging concentrations harder to identify.
Operational AI risk is rising as well
The Bank’s concern is not limited to asset prices.
It said incidents in frontier-AI test environments, in which autonomous models took unexpected actions, reinforced the need for financial institutions to prepare for AI-related cyber and operational threats. Dependence on a small group of technology and infrastructure providers could allow disruption to spread between firms.
The accompanying Bank of England Systemic Risk Survey shows how quickly AI has moved onto the financial sector’s risk agenda.
Among 57 participating institutions, 63% identified AI-related issues as a leading source of risk, an increase of 32 percentage points from the previous survey. Some 37% called AI one of their most difficult risks to manage, while 32% placed it among those most likely to materialise.
Cyberattack remained a more widely cited concern, but the rapid increase in AI responses suggests the technology is becoming a mainstream financial-stability issue rather than a specialised technology risk.
Resilience remains the balancing message
The Bank’s assessment is serious, but it is not uniformly negative.
Some 95% of respondents to its survey said they were either fairly or very confident in the UK financial system’s stability over the next three years. The FPC also concluded that British households and businesses remain broadly resilient and that the banking system could continue lending through a period of stress.
Recent economic data offer some support. The Office for National Statistics revised second-quarter UK growth upward to 0.5%, from an initial estimate of 0.4%. Real household disposable income per person increased by 1% during the quarter. The ONS release nevertheless shows an economy growing at a moderate pace rather than one insulated from tighter financial conditions.
The practical message is therefore about buffers. Resilience today does not remove the need to prepare for a sudden deterioration in market liquidity or a change in investor sentiment.
What investors should watch
For investors and finance professionals, the FPC’s warning suggests four indicators deserve particular attention.
First is gilt-market liquidity, especially evidence of widening bid-offer spreads, repo-market stress or forced reductions in leveraged positions. Second is the relationship between sovereign yields and corporate borrowing costs.
Third is the composition of AI financing. Rising debt issuance and private-credit exposure could make future adjustments more consequential than earlier equity-led corrections. Fourth is counterparty concentration among technology providers, prime brokers and private-market lenders.
The most important conclusion is not that any one market is about to fail. It is that the boundaries between sovereign debt, leveraged funds, private credit and technology investment are becoming less distinct.
When leverage is high, correlations can change quickly. An apparently contained adjustment can become systemic if investors must sell the same liquid assets to meet obligations elsewhere.
The Bank of England’s latest warning is therefore best read as a call for disciplined risk management: test liquidity assumptions, understand indirect exposures and avoid treating currently low volatility as proof that underlying vulnerabilities have disappeared.
