How it works
An opening also occurs at the start of the morning session and again when the afternoon session resumes. The opening price can differ significantly from the previous day's closing price, and stocks with major news out tend to attract particular attention at this point.
Difference from the closing price
While the opening price is the price determined at the start of trading, the closing price (see related page) is the price determined at the end of the day's trading. Both are determined using the same itayose method.