What is Open?

The open, or opening price, is one of four main data points used for day trading on the stock market. The other three are called low, high, and close — and all four are collectively known as OHLC. Traditionally, stock market trading was carried out during regular market hours, often only between 9am and 4pm local time, with markets closed on weekends. Cryptocurrency markets are open 24/7, so even though there is theoretically no opening price for crypto assets, the OHLC is still included on most charting platforms to signify the opening time of the regular stock market each day.