HKEX To Implement VCM And POS Enhancement In Its Derivatives Market On 12 April Date 12/03/2021 Hong Kong Exchanges and Clearing Limited (HKEX) is pleased to announce today (Friday) that it will implement enhancements to the Volatility Control Mechanism (VCM) and Pre-Opening Session (POS) in its derivatives market on 12 April 2021. VCM Enhancement The VCM is currently applied to the spot month and next calendar month contracts in the Hang Seng Index (HSI) Futures, Mini-Hang Seng Index (MHI) Futures, Hang Seng China Enterprises Index (HHI) Futures and Mini-Hang Seng China Enterprises Index (MCH) Futures, which only allows a maximum of one trigger per trading session. The enhancement will allow multiple triggers in each day trading session, to better safeguard market integrity.