RE: Larry12 Apr 2019 19:52
Any discussion on price monitoring extensions must firstly begin by covering auctions. Auctions are small intervals during the regular trading day where the electronic order book is effectively frozen. During this time, orders are collected from the market – known as the Call Period – and the matching algorithm considers the orders that have been entered and calculates the price that the maximum amount of shares can be executed. The intention is to find the most popular and reliable price for a security.
At the end of this Call Period, orders that can be matched are executed in an event referred to as the uncrossing, which takes place within a randomised 30 seconds of the end of the Call Period. However, should the auction fail to generate a reliable price, then a price monitoring extension is generated.
What happens during a price monitoring extension?
Should the preceding auction fail to generate a price within a predetermined percentage above or below the reference price, which is the price just before the stock went into the auction, then a price monitoring extension RNS is automatically released to the market, and the Call Period is extended by another 5 minutes. This extra 5 minutes provides participants the chance to review the prices of the orders that have been entered and if appropriate add, delete or amend.