Opening Cross
A price-discovery mechanism exchanges use to set the official opening price by matching accumulated orders.
What is Opening Cross?
The opening cross is a pre-market order-matching process used by stock exchanges such as Nasdaq to establish the official opening price for each security. Before regular trading begins, the exchange accumulates all pending buy and sell orders submitted during the pre-open period and runs a single matching algorithm to determine the price at which the maximum volume of shares can trade. This process provides transparent, orderly price discovery and reduces opening volatility compared to allowing trades to execute immediately when the market opens. Nasdaq introduced its opening cross in 2004, and the NYSE uses a similar designated market maker (DMM) facilitated open, both ensuring that the first trade of the day reflects a fair aggregation of all pre-market supply and demand rather than a single bilateral transaction.
Example
On Nasdaq, all orders placed during the pre-market session are matched in a single opening cross at 9:30 AM ET. The algorithm finds the price at which the greatest number of shares can be bought and sold simultaneously, and that price becomes the official opening price displayed on all market data feeds.
Source: Nasdaq — Opening Cross