Just caught wind of something pretty interesting from BlockBeats - Nasdaq is gearing up to pitch the SEC on extending stock trading hours in a major way. We're talking about moving from the current 16-hour window to nearly round-the-clock access. The proposal is built around what they're calling the 5x23 model, which basically means five trading days a week with 23 hours of daily trading action.

Here's how the new schedule would break down. The daytime session kicks off early at 4 a.m. Eastern, running through 8 p.m., which preserves the familiar pre-market, regular, and post-market windows we're used to. Regular trading still opens at 9:30 a.m. and closes at 4 p.m. But then there's the nighttime piece - a 9 p.m. to 4 a.m. session that would essentially give traders another seven hours to operate. Any trades between 9 p.m. and midnight would roll over to the next trading day, which is a technical detail but matters for settlement purposes.

The weekly cycle under this 5x23 framework would start Sunday at 9 p.m. and wrap up Friday at 8 p.m. after the daytime close. So you'd get continuous trading flow from Sunday evening straight through to Friday evening with just that one overnight gap.

What makes this noteworthy is the potential shift in market structure. If this gets approved, it could fundamentally change how traders operate and when liquidity flows. The 5x23 model isn't just about longer hours - it's about reimagining when markets are actually active. Worth keeping an eye on how the SEC responds to this one.