Closing numbers of the stock market can be amended after hours, states Investpedia. Because trading actions can occur after the markets close, prices can be affected after closing.
The U.S. Securities and Exchange Commission clarifies that many markets close at 4 p.m. United States Eastern time, and the closing price refers to the final price at which a stock was traded. Trades that occur in the subsequent hours are marked with a letter “T” by the Consolidated Tape Association in order to distinguish them from trades occurring during regular hours. Confusion can result when media outlets report varying numbers from differing time frames, according to the SEC.
The adjusted closing price can be helpful to determine a firm’s equity value, states Investopedia.