HKEX launches Closing Auction Session for its securities market


Hong Kong Exchanges and Clearing Limited (HKEX) has introduced its Closing Auction Session (CAS) for securities after extensive preparations and testing conducted in conjunction with market participants. There were 290 Exchange Participants that took part and 282 stocks were traded in the CAS on its first day, contributing 2.2% of the full-day turnover.

Closing auction is a trading mechanism commonly used in securities markets around the world to allow execution at securities’ closing prices. During a closing auction, market participants may input buy and sell orders, with the price that most volume can be traded at forming the closing price. All orders will then be executed at that price.

HKEX’s CAS has been designed after an extensive period of research on overseas practices, consultation with market participants and consideration of the diverse needs and concerns of the various segments of the market.

For CAS securities, the market close is between 4:08 pm and 4:10 pm on a normal trading day; for other securities, it is 4:00 pm on a normal trading day. In parallel, the closing time for the trading of stock index futures and options, currency futures and commodities futures in HKEX’s derivatives market has been extended from 4:15 pm to 4:30 pm on a normal trading day, except on the last trading day of the month.

To curb excessive price movements during the CAS, there is a two-stage price limit, initially at ±5% from the reference price and then between the best bid and best ask. Further details of the CAS are on the HKEX website.

Roger Lee HKEX
Roger Lee HKEX

Roger Lee, HKEX’s Head of Markets, said:

We consulted the market in January of last year and concluded in July of last year to introduce a CAS based on positive market feedback. We started actively engaging the market right after we announced our plans for our CAS, to ensure market participants were ready, and we appreciate the collective effort over the past 12 months that made today’s launch a reality and a success. With the CAS, we can meet market demand for execution at securities’ closing prices, and our approach to the market close is in line with the approaches of other leading exchanges.”

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HKEX launches Closing Auction Session for its securities market

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