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The Bank of England (BoE) has recently highlighted a nuanced perspective on cross-margining practices within Central Counterparties (CCPs). While acknowledging that margin offsets, which allow for reduced collateral requirements based on correlated or offsetting positions across different clearinghouses, can increase leverage in the system and potentially heighten systemic risk, the BoE also recognizes their role in encouraging greater central clearing.
The BoE’s Concerns:
* Increased Leverage and Systemic Risk: The primary concern is that by allowing for lower overall margin requirements, cross-margining could encourage market participants to take on more leverage. In times of market stress, when correlations can break down unexpectedly, this could lead to a sudden and significant increase in required margin, exacerbating liquidity demands and potentially contributing to systemic instability. The BoE has specifically pointed to how these arrangements rely on assumptions about correlations that can fail during stress events, as seen in recent market dislocations (e.g., US swap spreads and de-correlation of US equity prices and interest rates).
* Operational and Legal Challenges: Cross-CCP margining relies on cooperation between different CCPs to manage positions as a single portfolio in the event of a default. If this link breaks down, for any reason, the implications for unexpected margin calls could be significant.
* Procyclicality: While not directly causing market volatility, large and sudden margin calls can exacerbate it by increasing demand for liquid assets at a time when they are already scarce.
The Potential Benefit:
* Incentivizing Central Clearing: Despite the risks, cross-margining can make central clearing more attractive to market participants. By allowing for more efficient use of collateral, it can reduce the overall cost of clearing, thereby incentivizing more trades to be centrally cleared. Central clearing is widely seen as a crucial tool for reducing counterparty risk, improving transparency, and streamlining risk management across the financial system.
The BoE’s Stance:
The Bank of England’s comments suggest a delicate balancing act. While they advocate for the benefits of central clearing in reducing systemic risk, they are also keenly aware of the potential for certain practices, like cross-margining, to introduce new vulnerabilities. Their focus appears to be on ensuring the resilience of CCPs themselves and promoting greater transparency and understanding of margin models to prevent the amplification of shocks during periods of stress. This includes a push for more robust and defensible assumptions in initial margin models, particularly concerning margin periods of risk and margin offsets.

Video courtesy of Eurex

Video courtesy of Eurex