RE: No Buyers18 Dec 2020 10:25
Alpha.
During the trading day, the matching of buy and sell orders takes place on a real-time, continuous basis known as regular trading. Auctions differ from regular trading as matching is paused for a period of time, during which orders are collected from the market, which is known as the Call Period.
At this point in time, where the electronic order book is effectively frozen, the matching algorithm considers the orders that have been entered and calculates the price that the maximum amount of shares can be executed. The goal here is to find the most popular price, rather than the highest or lowest price.
At the end of this Call Period, orders that can be matched are executed in an event referred to as an uncrossing, which takes place within a randomised 30 seconds of the end of the Call Period – meaning it could start after 1 second, after 2 seconds, after 3 seconds, and so forth.
Notably, a very large proportion of the daily volume of shares traded are executed during an auction due to the large number of participants that focus their trading during these intervals.