After a Level 3 breach, trading on NYSE Group exchanges will remain halted for the rest of the trading day. On the next trading day, order entry will commence at the customary times for each exchange. However, NYSE Group exchanges will remain closed for all symbols until 9:30 am ET, at which time NYSE, NYSE American and NYSE Arca will begin NYSE Pillar Trading Platform. Our integrated trading technology platform that connects to all of our equities and options markets. Market Liquidity Programs. Promoting price improvement for individual investors on retail order flow for NYSE listed securities. signaling the opening or closing of the day’s trading. The stock market periodically closes during major U.S. holidays. Below, you will find a schedule of stock market holidays for the NASDAQ Stock Exchange and the New York Stock Exchange (NYSE) from 2020 to 2023. Learn more about stock market holidays.