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In finance, the term “Open” refers to the beginning price at which a security, such as a stock or bond, is traded when the markets open for business during a specified trading day. It sets the stage for the day’s trading activity and can significantly impact the daily high, low and closing prices. The opening price is determined by supply and demand factors influenced by buyers and sellers in the marketplace.


The phonetics of the word “Open” is /ˈoʊpən/.

Key Takeaways

  1. Open is a concept that promotes transparency and accessibility. It is often used in the context of software, indicating that the source code is available for everyone to see, study and modify.
  2. Open is fundamental in the creation of a collaborative environment. Whether it’s open source software, open data, or open education, the core principle remains the same: anybody can participate, contribute, and benefit.
  3. Open can have ethical and political implications. When technology, knowledge, or information is open, it ensures that power is distributed and not held by a select few. It gives individuals control over their technology and fosters a sense of community and cooperation.


The term “Open” in business/finance holds significant importance as it refers to the starting period of trading on a stock exchange. It is the first opportunity investors and traders have to react to news and events that occurred from the time the market was closed the previous business day. The opening prices of stocks, bonds, commodities, futures, and currencies might often experience significant fluctuations due to demand and supply imbalance, which could create profitable trading opportunities. Furthermore, the “open” forms the basis for future trading within the day and can serve as an indicator of market sentiments. Hence, knowledge of the “open” price in financial markets is pivotal for investment and trading decisions.


In finance and business, the term ‘Open’ refers primarily to the beginning of the trading day or the initial price point at which stocks, commodities, or indices are traded on an exchange. This is a vital aspect of the financial markets because it sets the initial benchmark or foundation for the day’s trading session. It’s also commonly referred to as the ‘opening price’. It carries significant weight as it indicates the starting point for the trading day, which traders use to gauge the day’s market trend.The open serves an important purpose by establishing the initial trading price based on pre-market activities, overnight news, or trading activities on markets that operate in different time zones. It’s extensively used for historical chart analysis and for formulating trading strategies. Traders and investors analyze the open in conjunction with other market activity, such as the high, low, and closing prices of the day, to make informed investment decisions. For example, if a stock’s opening price is significantly lower or higher than its previous closing price, it might indicate a potential trend or event influencing that stock.


1. Stock Market Trading: The term “Open” in the context of stock market trading refers to the beginning of the trading day or the price of a security at the beginning of the trading day. Every weekday, the New York Stock Exchange (NYSE) and other markets open at 9:30 a.m. EST, marking the start of the day’s trading session where investors can buy and sell securities.2. Open Account: In business transactions, an open account refers to a line of credit extended by a seller to a buyer where goods or services are sold without requiring immediate payment. It’s essentially an agreement where the seller trusts the buyer to pay at a later specified date. Expamples of this would include businesses that have standing accounts with regular suppliers and utility companies that bill customers for services AFTER they have been rendered.3. Open-End Mutual Funds: In finance, an open-end fund is a type of mutual fund that does not have restrictions on the amount of shares the fund can issue. When investors want to join the fund, the fund issues new shares and when investors want to leave, the fund buys back their shares. This is a common structure for many mutual funds and exchange-traded funds (ETFs).

Frequently Asked Questions(FAQ)

What does the term Open mean in finance and business?

Open is a term used to describe the start of trading on a particular exchange. It is the first price at which securities trade when the exchange opens for the day.

What is the significance of the opening price?

The opening price is significant because it determines the starting point from which a security will either rise or fall during the day. It often sets the tone for that day’s trading.

How is the opening price determined?

The opening price of a security is determined by the supply and demand of that particular security just before and just after the opening bell.

Does the opening price always equate to the previous trading day’s closing price?

No, the opening price does not always equate to the previous trading day’s closing price. They can differ due to after-hours trading activity, economic events, or changes in investor sentiment, among other reasons.

Can the term Open also refer to unfilled orders?

Yes, Open can also refer to orders that have been placed but not yet executed or filled. These are often referred as Open orders.

What is an Open Position?

An open position refers to a trade that has been entered, but has not yet been closed. It represents market exposure for the investor.

What are Open Interest and Open Market?

Open Interest refers to the total number of contracts that are currently open for a particular security. The Open Market, on the other hand, refers to a free-market system where supply and demand are not controlled by any entity or regulator.

Related Finance Terms

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