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The period at the beginning of the trading session officially designated by an exchange, during which all transactions are considered made "at the opening." Related: Close.


1. The beginning of a trading session on an exchange.

2. The first price of a security at the beginning of a trading day. In this sense, the opening is also called the opening price.


1. The beginning of a trading session.
2. The initial price at which a security trades for the day. Also called opening price.


The first transaction in each security or commodity when trading begins for the day occurs at what's known as its opening, or opening price.

Sometimes the opening price on one day is the same as the closing price the night before. But that's not always the case, especially with stocks or contracts that are traded in after-hours markets or when other factors affect the markets when the stock or commodity is not trading.

The opening also refers to the time that the market opens for trading or the time a particular instrument begins trading. For example, New York Stock Exchange (NYSE) opens at 9:30 ET. The first transaction in a single security may be at that time or at a later time.

References in periodicals archive ?
To address this issue, I use NASDAQ market opening prices from September 1997 to January 2001.
The pricing error of opening prices is measured from the mean reversion of the overnight return.
In fact, since the IPO discount is still large, we will probably continue to see opening prices that are well above offering prices.
The average opening price premium in October was 89.
Each year, opening prices are generally weak during this period because of the large number of IPOs.
The average opening price premium relative to the offering prices was 36.
Each March while the young wines are still in barrel, Bordeaux chateaux quote opening prices.