What it is:
In themarkets, open refers to the beginning of the trading day or the price of a security at the beginning of the trading day.
How it works (Example):
The New York closing price) becomes the opening price, or the open.Exchange has the most famous opening bell. At 9:30 am Eastern time, it rings. At that time, the last trading price for each security on the exchange the day before (the
Why it Matters:
The open is the start of a new day, though it is important tothat that doesn't necessarily trading hasn't been going on right before the open. After-hours markets remain open as do other exchanges in other countries and time zones, which provides opportunity for the price to change right up until the open in many cases.