Group 1 - Nasdaq plans to submit a proposal to the SEC for nearly round-the-clock stock trading, extending trading hours from 16 hours to 23 hours on weekdays [1] - The new trading schedule will include two trading sessions: a daytime session from 4 AM to 8 PM and a nighttime session from 9 PM to 4 AM [1] - The daytime session will maintain pre-market, regular, and after-hours trading, while the nighttime session will count trades executed from 9 PM to midnight towards the next trading day [1]