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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 ?
With over 20 years' experience in the consumer publishing sector, Aditus also offers similar services to the charity and membership sectors.
The CBSO is recording Tuur's Violin Concerto and Aditus for the ECM label this week.
The unique feature of operational frequency flexibility makes the SI2000 Aditus System the only leading edge CDMA based wireless access system in the world telecom industry in the 400MHz and this is a perfect match for the spectrum that has been allocated for fixed wireless deployment in Russia.
The goal of the alliance is - through synergies in technical achievements - to strengthen the position of ADITUS Medical and IGEA as the European leaders within cancer and gene therapy by means of electroporation.
It will offer the same high quality voice and wireless IP capabilities that are currently available with the Aditus product family that operates in the 1900MHz.
iClin Solutions, owned by ADITUS Medical and the management group, is a pioneer in Intelligent Electroporation and a leading provider of flexible, powerful and easy-to-use solutions for the cancer clinics in northern Europe.
LUND, Sweden, September 30 /PRNewswire/ -- In line with its new, expanded business strategy, ADITUS Medical today announced the acquisition of a strategic Electroporation patent family.