Extended-hours trading more than doubled its share of the U.S. stock market between 2019 and January 2025. Nasdaq got approved for 23-hour trading in April 2026. NYSE Arca wants 22 hours a day by December. The SEC is holding a public roundtable on 24-hour markets on September 17, 2026.
Almost none of this runs through a stock exchange yet. Right now, nearly all retail overnight trading routes through a single Alternative Trading System, a piece of market plumbing most traders placing an order at 11 p.m. have never heard the name of.
FINRA has required a specific six-risk disclosure for extended-hours trading since 2009: lower liquidity, higher volatility, changing prices, unlinked markets, news announcements, wider spreads. Most brokers post it once, during account setup, and most traders never open it again.
This report built two original simulations to put an actual number on what that disclosure has always left vague. It ran twenty thousand simulated orders through twenty thousand simulated overnight price windows. Actual math, not a warning label most traders skip.
The identical order, filled overnight instead of during a regular session, costs roughly 7 times more in the simulation. And a 3-percent price move that happens 1 in 150 times during a regular session happens 1 in 4 times overnight. This report shows you exactly how those numbers were built.
All of it below, with the exact page number next to each one.
A Trading Habits Report
The 24-Hour Trading Report
What already trades all night, what the exchanges are racing to launch by December 2026, and an original simulation of what thin overnight liquidity costs and risks against a regular session.
- Length 20 pages, with 11 original charts and two 20,000-run simulations
- Author TradingHabits.com
- Format PDF, delivered as an instant download right after checkout
- Covers overnight trading mechanics, the single ATS behind most of it, the 2026 exchange-level regulatory sprint, FINRA's six disclosed risks, and two original simulations
No stock is picked, ranked, or listed anywhere in this report, and no broker, venue, or platform named in it is recommended. Firms and venues are named only where they are the documented source of the history being described.
What's Inside
20 Things This Report Actually Says
- 01The four windows of an actual trading day, and the one FINRA calls "regular hours."Page 4
- 02An exact difference between "24-hour trading," "24/5 trading," and what already exists today.Page 4
- 03NYSE's own research: extended-hours trading more than doubled its market share between 2019 and January 2025.Page 5
- 04Why off-hours trading flipped from a post-earnings evening habit to a pre-market morning one.Page 6
- 05The pre-market session grew 15 times over since 2019. Post-market grew 2.3 times. Here's why the difference is that wide.Page 6
- 06A retail broker timeline, from TD Ameritrade's first overnight product in 2018 to Robinhood's 1,000-plus overnight symbols today.Page 7
- 07The single Alternative Trading System that handles an estimated 83 percent of overnight-session volume.Page 8
- 08That venue's own record session: 10.5 billion dollars in notional value, in one night.Page 8
- 09The 2026 timeline: NYSE Arca, Nasdaq, and Cboe all racing toward exchange-level overnight trading.Page 9
- 10Two pieces of invisible infrastructure, the SIP and the DTCC's clearing arm, that have to move first.Page 10
- 11Why London joined the race too, and what that means for where this trend is headed.Page 11
- 12FINRA's six disclosed extended-hours risks, explained in plain English instead of compliance boilerplate.Page 12
- 13A dated, documented stress test: what thin overnight liquidity did during the April 2025 tariff shock.Page 13
- 14One fully hypothetical, hand-worked example showing what a wider overnight spread costs on one order.Page 14
- 15An original simulation, 20,000 orders deep, built from scratch in Python and NumPy for this report.Page 15
- 16The result: a median overnight execution cost roughly 7 times higher than the identical regular-session order.Page 15
- 17A second simulation modeling FINRA's "higher volatility" warning directly, with an actual number attached.Page 16
- 18What institutional trading desks are still publicly worried about, and the specific weak points regulators are studying.Page 17
- 19Six questions to run before you place your next overnight order.Page 18
- 20Eight sources, from NYSE's own research desk to FINRA's rulebook, listed with exactly what each one backs up.Page 19
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Behind The Report
Six Years, A Doubled Market Share, And One Venue Doing Most Of The Work
From 5 Percent To 11 Percent
NYSE's own research desk tracked it directly: extended-hours trading accounted for a little over 5 percent of all U.S. equity share volume in the first quarter of 2019. By January 2025, that figure had more than doubled to over 11 percent, with daily notional value averaging more than 61 billion dollars by the end of 2024.
The composition flipped too. Post-market trading held 83 percent of off-hours volume in 2019. By 2025, pre-market had taken the lead at more than 55 percent, growing 15 times over in six years.
Where It Runs Right Now
Almost none of today's retail overnight trading touches a lit exchange. It routes instead through Blue Ocean ATS, a single Alternative Trading System that handled an estimated 83 percent of overnight-session volume as of December 2025, with a record single-session notional value of 10.5 billion dollars.
No broker or venue is named on this page as a recommendation. The full 2026 exchange-level timeline, FINRA's six disclosed risks, and two original simulations showing what that thin liquidity costs and risks are all in the report itself.
Extended-Hours Trading's Market Share, In One Chart
A simplified rendering of the growth curve discussed on page 5 of the report. Background only. The report itself covers the exact sourcing behind every one of these figures.
Try It: What The Report's Own Simulation Found
Regular-session cost is modeled at half the quoted spread, the same illustrative mechanic used on page 15. Overnight cost applies the report's own median simulated ratio of roughly 7 times the regular-session figure. Move the sliders. The full 20,000-order distribution, not only the median, is in the report.
Background only. Nothing on this page or in this report is a recommendation to buy, sell, or hold any security, or to trade during any specific window, or to use, avoid, or route orders through any specific broker, venue, or trading platform.
Common Questions
Is 24-hour stock trading already here, or is this still a few years out?
Both, depending on what you mean. Retail brokers have offered a patchwork of extended-hours access since 2018, and by 2026 that includes overnight sessions through several major firms. True exchange-level 24-hour trading, where the NYSE and Nasdaq themselves stay open around the clock, is still in progress: Nasdaq's 23/5 proposal was approved in April 2026, NYSE Arca is targeting a 22-hour session by December 2026, and the SEC is holding a public roundtable on the full transition on September 17, 2026. The report separates what already exists from what's still being built, section by section.
What is Blue Ocean ATS, and why does it matter this much?
It's a FINRA-registered Alternative Trading System, not a stock exchange, that runs a nightly overnight session and currently handles the large majority of overnight-session trading volume. Nearly every major broker's overnight product routes through it. The report covers exactly what that means for order types, pricing, and the protections that do and don't apply, on page 8. This isn't a recommendation to use or avoid it, it's the documented structure of how overnight orders actually get filled today.
Where does the "7 times more expensive" figure actually come from?
From an original simulation built for this report: 20,000 hypothetical market orders, each modeled with a regular-session spread and an overnight-session spread that runs a stated, illustrative 2.5 to 6 times wider, in line with FINRA's own disclosed lower-liquidity and wider-spread risks. The median simulated overnight cost came out to roughly 7 times the median regular-session cost. It's a simulation built on stated assumptions, not a guarantee about any specific stock on any specific night, and the report walks through exactly how it was built on page 15.
Does this report tell me whether I should trade overnight?
No, and it isn't trying to. It lays out the mechanics, the venue, the 2026 timeline, FINRA's own six disclosed risks, a documented stress test, and two original simulations, then hands you a six-question checklist on page 18 to run before you place your own next overnight order. No stock is picked, ranked, or listed anywhere in it, and no broker or venue is recommended.