HKEX set to enhance Volatility Control Mechanism

Maria Nikolova

HKEX’s VCM aims to prevent extreme price volatility among individual stocks.

Hong Kong Exchanges and Clearing Limited (HKEX) today announces that it will introduce the first phase enhancements of the Volatility Control Mechanism (VCM) on May 11, 2020.

HKEX’s VCM, which was first introduced to the securities market in August 2016, is designed to prevent extreme price volatility among individual stocks.

HKEX proposed the VCM enhancements in a consultation paper in 2019. This followed guidance issued by the International Organisation of Securities Commissions asking regulated markets to review and adjust their volatility controls to ensure that they stay relevant with respect to the latest market developments.

HKEX proceeded with implementation of the first phase of VCM enhancements after concluding that there was substantial market support for its proposal based on the consultation feedback.

The first phase of VCM enhancements include:

  • Expanding VCM stock coverage from constituent stocks of the Hang Seng Index and Hang Seng China Enterprises Index (total number of stocks at 78) to constituent stocks of Hang Seng Composite LargeCap, MidCap and SmallCap Indexes (total of nearly 500 stocks); and
  • Applying a tiered structure of triggering thresholds at ±10 per cent, ±15 per cent, and ±20 per cent to the last traded price five minutes ago respectively for the constituent stocks of the three Hang Seng Composite Indexes.

Six months after the implementation of the first phase enhancements, HKEX will conduct a review on market operations before implementing the second phase enhancement, which will allow multiple triggers per stock per trading session.

“The enhancement will further strengthen our stock-level safeguards during extreme price volatility, and reflect changes in international practice and regulatory guidance,” said HKEX’s Head of Markets Wilfred Yiu.

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