Nasdaq's Night Session Enters a Market Blue Ocean ATS Already Built

Blue Ocean ATS already cleared $382B overnight in 2025. December 6 just adds three unlinked exchanges to the same book.

Nasdaq’s Night Session doesn’t create new overnight liquidity on December 6. It legally clears exchanges to enter a market Blue Ocean ATS already scaled to $382 billion in 2025 volume, at the exact moment none of the arriving venues will be required to avoid trading through a better price sitting on another book.

Nasdaq filed to trade U.S. equities 23 hours a day, five days a week. The SEC approved it on an accelerated basis on April 10, 2026. The exchange is targeting December 6 for a 9:00 p.m. to 4:00 a.m. ET “Night Session” that leaves the market closed for exactly one hour a day.Nasdaq Night Session Approval Order, SEC Release 34-105199 I read the filing the way I’d read a prospectus. My eye goes to what it admits, and I mostly ignore what it announces. What it admits is that Nasdaq is not opening a market. It is entering one, five years after somebody else built it, under a rulebook that stops mattering at 4:00 p.m.

I walk through the filing itself, and the arithmetic behind it, on screen in the film version of this piece.