Term · Liquidity & Trading
Opening Auction
In briefThe opening auction is the trading phase at the start of the trading day, in which accumulated orders are collected and matched into a single opening price under the principle of maximum executable volume. Especially in thinly traded stocks, this price can be strongly influenced by just a few orders.
Definition
The opening auction is the trading phase at the beginning of the trading day, in which buy and sell orders are collected and matched into a single opening price. The price is determined under the principle of maximum executable volume, which achieves the largest executable turnover. At the start of trading it replaces continuous trading.
Why it matters for small caps
For thinly traded small and micro caps, the opening auction concentrates liquidity and can produce large price swings when only a few orders are present. Anyone trading illiquid stocks should watch auction prices and the order-book situation closely.
Common misreadings
- The opening price is misread as a representative market price, even though with low volume it can be heavily distorted by a small number of orders.
In the process
Frequently asked
How is the opening price determined?
Under the principle of maximum executable volume: the price is chosen at which the largest trading volume can be executed.
Why is the opening auction important for small caps?
Because it concentrates liquidity and, in thinly traded stocks, can lead to marked price jumps when only a few orders are present.
Are there other auctions during the trading day?
Yes; typically there are additionally one or more intraday auctions as well as a closing auction at the end of trading.
Related terms
Sources
Primary
Deutsche Börse Xetra
https://www.deutsche-boerse.com/
https://www.deutsche-boerse.com/
Education only, not investment advice. Ranges and thresholds are didactic orientation values, not an official standard.