Trading Halts and Delays

Securities exchanges, such as the New York Stock Exchange (NYSE) as well as the Nasdaq Stock Market, have the authority to halt and delay trading in a security. A trading halt—which typically lasts less than an hour but can be longer—is called during the trading day to allow a company to announce important news or where there is a significant order imbalance between buyers and sellers in a security. A trading delay (or "delayed opening") is called if either of these situations occurs at the beginning of the trading day.

https://www.sec.gov/fast-answers/answerstradinghalthtm.html

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