The Bank of England (BoE) now sees hedge funds as a double-edged sword for the UK's government bond market.
Sarah Breeden, the BoE's Deputy Governor for Financial Stability, recently highlighted this trade-off: hedge funds are essential buyers helping the UK finance its significant borrowing needs, but their trading strategies can also pour fuel on a fire during market turmoil. This isn't just a theoretical concern; it's a direct lesson from the past and a core focus of the BoE's current policy thinking, especially as the investor base for UK government bonds, or 'gilts', has changed.
Historically, stable, long-term investors like pension funds were the main holders of gilts. Today, the landscape is different. More price-sensitive and leveraged players, including hedge funds and foreign investors, have become dominant. While their appetite for gilts helps the government sell debt at attractive yields—as seen in a record-breaking £15 billion bond sale in April—it also introduces a new kind of fragility.
This shift in focus can be traced back to the 'LDI crisis' of September 2022. A sudden spike in gilt yields triggered a vicious cycle of forced selling by pension funds, nearly causing a market collapse and forcing the BoE to intervene. That event was a stark reminder of how leverage in the non-bank financial sector can amplify shocks rather than absorb them. The BoE's subsequent stress tests, known as the System-Wide Exploratory Scenario (SWES), confirmed these fears.
First, the analysis revealed that a small number of hedge funds account for over 90% of the net borrowing in the gilt 'repo market'—a critical funding source. Second, it showed that in a stress scenario where funding becomes scarce or more expensive, these funds could be forced to rapidly unwind their positions. This deleveraging would mean selling gilts into an already falling market, causing prices to spiral downwards and amplifying the initial shock.
Therefore, when Deputy Governor Breeden warns about amplification risk, she is directly referencing these well-documented mechanisms. The BoE's message is clear: while the high demand from hedge funds is welcome, the underlying financial plumbing must be strengthened. This points towards upcoming regulations aimed at making the repo market more resilient, likely through higher collateral requirements (haircuts) and more centralized clearing. The goal is to ensure the gilt market remains stable, even if it comes at the cost of slightly higher borrowing costs for leveraged players.
- Glossary
- Gilts: Bonds issued by the UK government. They are the equivalent of U.S. Treasury bonds.
- Repo Market: A market for short-term borrowing. Participants sell securities (like gilts) with an agreement to repurchase them at a higher price at a later date. It's a key source of funding for many financial institutions.
- LDI (Liability-Driven Investment) Crisis: An event in the UK in late 2022 where a sharp rise in government bond yields caused major liquidity problems for pension funds, forcing the Bank of England to intervene to stabilize the market.