The Bank of England has fired a warning shot across the bows of the London market, cautioning that the exuberance surrounding artificial intelligence stocks poses a systemic risk to the UK financial system. In a stark assessment released this morning, the Bank’s Financial Policy Committee flagged “signs of irrational exuberance” in AI-related equities, warning that a sharp correction could spill over into broader markets, triggering capital flight and a spike in gilt yields.
This is not the first time the Old Lady of Threadneedle Street has cried wolf over asset bubbles. But the context today is more fraught. The AI boom, fuelled by a diet of cheap money and hyperbolic forecasts, has inflated valuations to levels that would make the dot-com era blush. The FTSE 100, long a bastion of stolid sectors like mining and banking, has seen a surge in AI-linked names, with some tech stocks doubling in the past year. The problem? Earnings have not kept pace. The price-to-earnings ratios for many of these firms are now eye-watering, propped up by promises of future productivity miracles.
For the London market, the risk is contagion. The Bank of England’s own data reveals that UK institutional investors have increased exposure to AI stocks by 40% since 2023. Pension funds, chasing returns in a low-yield environment, have piled in. If the music stops, the unwind could be brutal. Redemptions would force selling, depressing prices and triggering margin calls. The result: a classic liquidity spiral that would infect the gilt market, where yields are already edging higher on inflation fears. A sudden spike in gilt yields would raise the government’s borrowing costs, squeezing fiscal headroom for a Chancellor already struggling with an anaemic growth outlook.
The irony is that the Bank of England itself is partly to blame. Its aggressive rate hikes in 2022-23 were meant to tame inflation, but the subsequent easing cycle in early 2024 poured petrol on the AI fire. Investors, emboldened by a dovish pivot, borrowed cheaply to speculate. The result is a misallocation of capital reminiscent of the South Sea Bubble. As Warren Buffett might say, only when the tide goes out do you learn who has been swimming naked.
What should investors do? The prudent path is to reduce exposure to speculative tech and increase allocations to defensive assets: cash, short-dated gilts, and perhaps gold. But here’s the rub: the market is addicted to narrative. AI is the story du jour, and stories are hard to kill. The Bank of England’s warning may be ignored until it’s too late. I recall 2007, when the Bank warned about subprime risks, and the City shrugged. We all know how that ended.
For the UK economy, the stakes could not be higher. The London market is the lifeblood of corporate finance and pension provision. A significant correction would not only erode household wealth but also impair the ability of companies to raise capital for genuine innovation. The government’s vision of a tech-led recovery would lie in tatters. The Chancellor must now hope that the Bank of England’s rhetoric is enough to cool the fever. But in my experience, markets do not respond to polite suggestions. They respond to action: higher rates, tighter margin requirements, or direct regulatory intervention.
In the short term, expect volatility. The VIX, Wall Street’s fear gauge, has already spiked. London’s equivalent, the FTSE 100 volatility index, will follow. Gilts may sell off as investors demand a risk premium. The pound could weaken, a double-edged sword for exporters but a headache for inflation hawks. The next few weeks will be telling. If AI stocks resume their climb, the Bank of England may have to drop the velvet glove and reveal the iron fist. If they correct, we will see just how deep the contagion runs.
For now, the bottom line is this: markets hate uncertainty, and the Bank of England has just added a bucketload. The only certainty is that the cost of this irrational exuberance will be paid by someone, and it will not be pretty.
