I only recently took the time to seriously study the trading rules for Hong Kong stocks, and I found that the closing time is indeed a bit particular. The Hong Kong Exchanges and Clearing (HKEX) does not simply close at 16:00. Instead, there is a thing called the “closing auction session,” during which the market closes randomly sometime between about 16:00 and 16:10—this is quite different from A-shares.

The daily trading process for Hong Kong stocks works like this: from 9:00 to 9:30 in the morning is the pre-opening auction; from 9:30 to 12:00 is the official morning session. From 12:00 to 13:00 there is a continuation of the morning session (this part is a little strange), and then from 13:00 to 16:00 is the afternoon session. So, the closing time for Hong Kong stocks is not fixed at 16:00; instead, trades are executed randomly within the closing auction session, with the latest being around 16:10.

What you especially need to pay attention to is that Hong Kong stocks have a lot of holiday market closures. In 2026 alone, there will be several days off for the Lunar New Year, Qingming, and the Dragon Boat Festival, and some days have afternoon closures. If you plan to trade Hong Kong stocks, you must make sure to note in advance the closing times and holiday dates for Hong Kong stocks—especially on half-day trading days, when the market closes early at 12:00.

These days, I always check the calendar of the Hong Kong Exchange in advance so I don’t get the trading periods wrong. The trading rules for Hong Kong stocks are indeed more complicated, but once you sort out these timing arrangements, trading becomes much smoother.