BoE Unveils Doomsday Scenario Stress Test for Private Markets

The Bank of England (BoE) has launched a comprehensive stress test designed to gauge the resilience of the financial system's rapidly expanding private markets arm. The scenario, unveiled by the central bank on Friday, envisions a severe global economic shock that includes interest rates surging to 7%, a 35% collapse in UK share prices, and a 400 basis-point increase in leveraged loan spreads. This "System-Wide Exploratory Scenario" (SWES) goes beyond traditional bank-focused stress tests, aiming to understand the potential systemic risks and interconnections within private markets across the broader financial system.

The scenario is predicated on an unspecified geopolitical shock that disrupts technology hardware component supply chains, triggering a deep global recession. This leads to a 4% contraction in the UK economy, coupled with significantly higher unemployment and inflation. A key element of this scenario is the BoE raising interest rates to 7%. The Bank emphasizes that this scenario is not a forecast of future events but rather a tool to represent a severe but plausible tail-risk outcome. Furthermore, rapid developments in the artificial intelligence sector and deepening links between these firms and credit markets are considered a potential area of concern, as a sharp asset price correction could increase financial stability risks from lending.

Over the past two decades, global private markets have experienced significant growth, expanding from less than $4 trillion in 2008 to approximately $16 trillion today, with the UK market alone accounting for around $185 billion. This expansion, particularly in private credit, has been accelerated by regulatory reforms in the banking sector following the 2008 Global Financial Crisis, which led banks to withdraw from certain lending areas. A wide array of financial institutions, including private capital managers, banks, and institutional investors, are participating in this exercise, with major firms like Goldman Sachs, Carlyle, Blackstone, and Apollo confirmed to be involved. The test's objective is not to assess the survival of individual firms, but rather to comprehend how collective actions, such as asset sales or collateral calls, might propagate and amplify the initial shock throughout the system.

Under such a severe scenario, financial conditions would tighten considerably, and borrowing costs would rise. Weak economic activity and nominal GDP growth would lead to a decline in corporate revenues, while elevated funding costs and impaired exit markets would put pressure on leveraged corporates and the private market ecosystem. The scenario anticipates that risk-off behavior would lead to a sharp increase in risk premia across global financial markets, causing asset prices, particularly for riskier assets, to fall. The FTSE All-Share index is projected to decline by approximately 30%, and the S&P 500 by around 35% in the first year.

The rapid growth of private markets and their increasing interconnectedness with banks and insurers have drawn the attention of global regulators. The US Federal Reserve (Fed) identified private credit as one of the most widely cited near-term risks to financial stability in its May 2026 Financial Stability Report. The European Central Bank (ECB) has also expressed concerns about the growing interconnections and "cross-sector linkages" between banks and non-bank financial institutions, with the European Union reportedly planning a similar private markets stress test in 2026.

The BoE expects to present the initial findings of this extensive exercise in its Financial Stability Report, due on July 7, 2026. Participants will have the opportunity to provide feedback on the initial findings and evaluate their responses. The final report is slated for publication in 2027. The outcomes of this test are expected to inform future regulatory approaches for private credit funds and lead to significant steps to better manage risks within the sector.