Bank of England Deputy Governor Warns Stock Markets Are Overvalued and Due for a Fall

The Bank of England's Deputy Governor for Financial Stability, Sarah Breeden, issued a stark warning on Thursday that global equity markets are overpriced relative to the risks embedded in the broader economy, and that a correction is likely.

Breeden said she expects an "adjustment" in markets, citing several areas where she believes risk is being underpriced. Chief among her concerns are the rapid growth and opacity of private credit markets, the elevated valuations of artificial intelligence-related stocks, and what she described as other "risky valuations" across financial markets.

Her remarks come as global stock indices have hovered near record highs in recent years, driven in part by investor enthusiasm for AI technology and continued economic resilience in major economies. However, Breeden's warning reflects a growing unease among financial regulators that markets may be disconnected from macroeconomic realities.

Private credit — lending provided by non-bank institutions such as private equity firms — has expanded rapidly over the past decade, filling a gap left by more tightly regulated banks following the 2008 financial crisis. Regulators have increasingly flagged the sector's limited transparency and potential for systemic risk if borrowers begin to default en masse.

On AI stocks, Breeden's comments echo similar cautions raised by other central bankers and analysts who have questioned whether the extraordinary valuations assigned to AI companies can be sustained given that the technology's commercial returns remain uncertain for many businesses.

Breeden did not specify a timeline for any market correction, nor did she characterise a potential fall as catastrophic. Her comments were framed as a stability concern — that markets are not adequately pricing in tail risks — rather than a forecast of imminent crisis.

The Bank of England did not release a full transcript of her remarks at the time of publication. The warning is consistent with the Bank's broader remit to monitor and communicate financial stability risks to the public and to market participants.

Why This Matters

A senior central banker publicly warning that markets are overvalued can itself influence investor behaviour, potentially accelerating the very correction she is flagging.
If private credit markets experience stress or AI stock valuations deflate sharply, the effects would ripple across pension funds, institutional investors, and retail portfolios globally.
The warning adds regulatory pressure on private credit providers and AI-sector companies to demonstrate tangible returns and greater transparency.

Background

Global stock markets have experienced a prolonged bull run, particularly in the technology sector, fuelled by post-pandemic monetary stimulus and, more recently, investor enthusiasm for artificial intelligence. The S&P 500 and other major indices reached record or near-record highs heading into 2026, with AI-related companies commanding valuations that many analysts have described as historically elevated relative to earnings.

Private credit has grown into a multi-trillion-dollar asset class since the 2008 financial crisis, as banks retrenched from riskier lending under tighter regulatory requirements. While the sector has provided returns for investors in a low-interest-rate environment, regulators including the Bank of England, the IMF, and the Financial Stability Board have repeatedly flagged concerns about its lack of transparency and the difficulty of assessing systemic exposure.

Sarah Breeden, appointed Deputy Governor for Financial Stability in 2023, has a mandate to identify and communicate risks to the UK and global financial system. Her warnings follow similar cautionary notes from central banks in the US and Europe over the past 18 months regarding asset price inflation and the pace of AI investment.

Key Perspectives

Bank of England / Regulators: Breeden's position is that markets are not adequately pricing in macroeconomic and structural risks. Her role specifically requires her to raise such concerns publicly as a tool for encouraging prudent behaviour among investors and institutions.

Investors and Market Participants: Many institutional investors argue that AI valuations, while high, reflect genuine long-term transformative potential. Proponents of private credit contend the sector is more resilient than regulators suggest, with diversified borrower bases and floating-rate structures that protect lenders in higher interest rate environments.

Critics and Skeptics: Some economists warn that central bank communications about overvaluation can themselves be destabilising if they erode confidence without providing specific guidance. Others argue that regulators have been warning about asset bubbles for years without a significant correction materialising, raising questions about the practical utility of such forecasts.

What to Watch

Monitor AI sector earnings reports over the next two quarters for evidence of whether commercial revenues are justifying current valuations.
Watch for any formal guidance or regulatory action from the Bank of England or the Financial Stability Board targeting private credit disclosure requirements.
Track flows into and out of private credit funds as a signal of whether institutional investors are heeding stability warnings or maintaining their current risk appetite.

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