HKEX To Implement VCM 2nd Phase Enhancement On 29 March Date 05/03/2021 Hong Kong Exchanges and Clearing Limited (HKEX) is pleased to announce that it will implement the second phase enhancement of the Volatility Control Mechanism (VCM) in its securities market on 29 March 2021. The first phase enhancements were successfully launched in May 2020, and currently only one trigger per applicable security is allowed in each trading session. The second phase enhancement will allow multiple triggers of the VCM per applicable security in the same trading session. "We are pleased the first phase of the Volatility Control Mechanism enhancements have been well received by the market. In view of the orderly market operations since the launch of the first phase, we will implement Phase 2 as planned to further strengthen our market integrity,” said HKEX’s Head of Markets Wilfred Yiu.