What time does the stock market open and close?
The regular U.S. stock market session runs from 9:30 AM to 4:00 PM Eastern Time on normal trading days. NYSE calls this its Core Trading Session, and Nasdaq calls it Regular Market Hours. Both use the same 9:30 AM opening and 4:00 PM closing reference for standard U.S. equities.
Extended-hours trading adds access outside the regular session. Nasdaq currently publishes pre-market from 4:00 AM to 9:30 AM ET and after-hours from 4:00 PM to 8:00 PM ET. Those windows do not mean every broker or every security is available for the entire period.