The liquidity provider is exempted from providing liquidity when there is a “fast market” which materially affects the issuer’s hedging ability. “Fast market” refers to situations where the financial markets experience exceptional price movements and high volatility over relatively short periods of time, which can result in a sudden increase in risk and uncertainty, possibly affecting issuers’ hedging abilities.
A significant move in the Hang Seng Index or the overall market may or may not result in exceptional price movement and high volatility of the underlying stock. In this case, the liquidity provider may need to demonstrate to the Exchange that its hedging ability has been materially affected by exceptional price movement during a short period of time.