IOSCO reports on market liquidity and extended trading hours for equity markets

The International Organization of Securities Commissions (IOSCO) has published a consultation report on regulatory considerations and good practices on the evolution of market liquidity during the trading day for equity markets. The consultation highlights a growing concentration of trading activity at market close, driven by technological developments and trading strategies, noting that while deeper closing auctions may enhance price discovery, they may also pose risks. IOSCO therefore proposes a set of good practices aimed at supporting fair, orderly and resilient markets. This is based on the analysis of how liquidity is distributed throughout the trading day, the implications of evolving liquidity patterns and auction designs, and the effectiveness of existing regulatory and supervisory approaches. The deadline for feedback is 21 August.

In parallel, IOSCO has published a report on extended trading hours for equity markets. This report looks at how extended trading works across IOSCO jurisdictions and its benefits and risks. It finds that trading outside normal hours varies between jurisdictions and is mainly retail-driven, with limited institutional involvement. Where it exists, it is usually introduced by trading venues in response to demand. However, this is characterised by lower liquidity, wider bid-ask spreads, and different execution conditions compared to regular hours. Based on the findings, IOSCO emphasises the importance of continued monitoring and information-sharing to ensure that market integrity, operational resilience and investor protection remain central as trading practices evolve. While the report focuses on equity markets, IOSCO may explore related areas (such as asset management, valuations, risk management or derivatives) in the future.

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