The European Central Bank published analysis in its Financial Stability Review highlighting that UCITS hedge funds can pose liquidity and leverage-related risks, given their investor redemption terms and intensive use of derivatives. It argues that a more robust stress-testing framework and stronger risk management are needed to limit the potential for these funds to amplify market stress. Euro area hedge funds held around EUR 660 billion of assets in Q3 2025 (about 3% of the euro area investment fund sector), with UCITS hedge funds accounting for roughly 30% of the sector by shares issued and total assets and showing higher retail participation than AIF hedge funds. While UCITS hedge funds show lower balance-sheet leverage than AIF hedge funds (total assets-to-equity of 1.3 versus 1.7), synthetic leverage through derivatives is more pronounced, with gross notional derivatives exposure reaching up to 12 times equity for some categories, and they hold a lower proportion of highly liquid assets. ECB analysis of 457 UCITS hedge funds finds flows are procyclical and that leveraged UCITS hedge funds experience larger outflows in periods of market stress, while rising margin calls on derivatives during elevated volatility can further strain liquidity as funds manage both redemptions and collateral demands. The ECB notes that, unlike for AIFMD-compliant funds, authorities lack tools to contain excessive leverage in UCITS hedge funds, and the Eurosystem suggests introducing discretionary powers to impose stricter leverage limits when financial stability risks emerge and requiring all UCITS hedge funds to report leverage using the commitment approach.