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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.
Copyright © 2012, Campbell R. Harvey. All Rights Reserved.


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.
Farlex Financial Dictionary. © 2012 Farlex, Inc. All Rights Reserved


1. The beginning of a trading session.
2. The initial price at which a security trades for the day. Also called opening price.
Wall Street Words: An A to Z Guide to Investment Terms for Today's Investor by David L. Scott. Copyright © 2003 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved. All rights reserved.


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.

Dictionary of Financial Terms. Copyright © 2008 Lightbulb Press, Inc. All Rights Reserved.
References in periodicals archive ?
The pricing error of opening prices is measured from the mean reversion of the overnight return.
The amount of profit acquired from the trading strategy will be a measure of the mean reversion and the pricing error in opening prices. To make the trading strategy feasible, the market-wide average overnight return of a given day is calculated from the stocks that had opening transactions in the first minute after the market opening on that day.
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 89.6%, far higher than the 46.6% average for all 2007 IPOs.
The average opening price premium relative to the offering prices was 36.63% in April 2007, slightly lower than the 39.42% average for all IPOs thus far in 2007.
On the secondary market, two of the April IPOs had an opening price below the offering price, seven had an opening price that was about the same, and six had an opening price that was more than 50% higher.