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Bank of England Deputy Warns Global Stock Markets Are Overvalued and Likely to Decline

Bank of England deputy governor Sarah Breeden warns global stock markets are overvalued amid multiple risks, including private credit concerns and AI investment bubbles, urging preparedness for potential market corrections.

·3 min read
Getty Images Sarah Breeden at a Bank of England meeting

Bank of England Deputy Governor Highlights Overvalued Stock Markets

The Bank of England anticipates a decline in global stock markets, as current share prices fail to adequately reflect numerous risks confronting the world economy, according to the Bank's deputy governor in an interview with the BBC.

"There's a lot of risk out there and yet asset prices are at all-time highs. We expect there will be an adjustment at some point."

Sarah Breeden, who also serves as the Bank's head of financial stability, made these remarks, which are notable given the rarity of such direct commentary on market movements from senior Bank officials.

A pair of line charts showing the UK FTSE 100 and the US S&P 500 stock market indexes over the year to 23 April 2026. In the first chart, the FTSE 100 is shown as a red line. It has increased by 24% from around 8,400 a year ago to 10,431 on 23 April this year. The S&P 500 is shown as a blue line in the second chart and has risen by 33% from around 5,400 to 7,138. Both lines dipped in March this year but have rebounded in April.

Concerns Over Timing and Scale of Market Correction

Breeden refrained from specifying when or by how much markets might fall but emphasized several factors that appear to be underestimated by investors.

"The thing that really keeps me awake at night is the likelihood of a number of risks crystallising at the same time – a major macroeconomic shock, confidence in private credit goes, AI and other risky valuations readjust - what happens in that environment and are we prepared for it?"

The US stock market, home to the world's largest companies, has recently reached a series of record highs despite warnings from the International Energy Agency about the most significant energy shock in history impacting the global economy.

AI Investment Frenzy Compared to Dotcom Bubble

Technology companies have invested hundreds of billions of dollars into artificial intelligence infrastructure. This surge has prompted figures such as Microsoft founder Bill Gates to describe the situation as "a frenzy" reminiscent of the late 1990s dotcom bubble, when investors heavily funded unproven startups that subsequently failed or lost substantial value.

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However, Jensen Huang, CEO of Nvidia—the leading supplier of chips to AI companies—has dismissed these concerns.

Risks in the Shadow Banking Sector

Several funds that operate similarly to banks by lending privately to businesses have incurred losses and restricted investor withdrawals, raising alarms about vulnerabilities within the financial system.

Breeden highlighted the rapid expansion of this so-called "shadow banking" system, which has yet to be tested under current conditions.

"Private credit has gone from nothing to two-and-a-half trillion dollars in the last 15 to 20 years. It hasn't been tested at this scale with the degree of complexity and interconnections it has with the rest of the financial system so far,"
"It's a private credit crunch, rather than a banking-driven credit crunch, that we're worried about."

UK Market Near All-Time Highs Despite Different Composition

Unlike the US market, the UK stock market lacks the size and type of AI companies that have propelled US markets to record levels. Nonetheless, the FTSE 100 index is currently within 5% of its own all-time high.

Breeden emphasized that her role is not to predict the timing or magnitude of market declines but to ensure the financial system's preparedness for such events.

"What we are watching for: is how might those prices fall? Will there be a sharp adjustment downwards? And if there is such an adjustment, how will that affect the economy? I'm not saying it will happen today, tomorrow, in 12 months' time. It's ensuring that if it happens the system is resilient."

This article was sourced from bbc

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