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QQQ is the Invesco QQQ Trust, one of the most heavily traded ETFs in the world. It tracks the Nasdaq-100 index of the 100 largest non-financial companies listed on Nasdaq, so it moves with the biggest US technology stocks.
The official QQQ price is only published while the US stock market is open, so it freezes overnight and at the weekend. WeekendIndex shows a live QQQ price 24/7, implied from markets that keep trading. This is an implied market price, not the official last sale.
Yes. The official QQQ is only published while the U.S. stock market is open, so it freezes on weekends. WeekendIndex shows a live, continuously-updating QQQ price 24/7, so you can watch it on Saturday and Sunday.
WeekendIndex tracks 24/7 markets that price the QQQ around the clock. Even when the New York exchanges are closed overnight or on holidays, those markets keep moving, so the price you see here keeps updating. It is an implied market price, not the official index value.
The underlying U.S. stocks trade from 9:30 AM to 4:00 PM Eastern on weekdays, with pre-market and after-hours sessions around that window. WeekendIndex shows a price outside those hours too, 365 days a year.