European Central Bank assesses mandatory central clearing to curb NBFI leverage risks in euro area government bond repo markets

The European Central Bank published analysis in its Macroprudential Bulletin on the rapidly growing role of non-bank financial intermediation (NBFI), particularly investment funds, in euro area government bond repo markets, with activity concentrated in the non-centrally cleared segment. It examines whether mandating central clearing could be used to address leverage-driven vulnerabilities that can amplify deleveraging dynamics in stress. The article argues that central clearing could raise the effective cost of highly leveraged repo strategies through stricter risk management and limits on collateral re-use, and could mitigate counterparty risk by moving exposures from bilateral dealer relationships to a central counterparty (CCP). However, it notes that around 60% of outstanding euro-denominated government bond repo is already centrally cleared, implying smaller marginal benefits than in jurisdictions with lower clearing shares, and highlights potential trade-offs including increased cash liquidity needs to meet CCP variation margin calls in volatility, higher trading costs, lower market liquidity in normal times, and reduced access for some end-users where sponsored access is uneconomical. Mandatory central clearing is set against alternatives such as entity-based measures for investment funds and activity-based tools like haircuts, with the article noting that a clearing mandate would apply more broadly, including to the interbank segment, and could have implications for market functioning and monetary policy implementation. It also points to ongoing international work on practices to ease liquidity pressures from intraday variation margin calls.