Explainer · Reading a Stock Page
Pre-market and after-hours trading explained
Some stock pages show a second price under the main one, labeled pre-market or after-hours. That number comes from trading outside regular hours, and it follows different rules of thumb than the daytime price.
Quick answer
Pre-market and after-hours trading happen outside regular hours, which FINRA's rule generally defines as 9:30 a.m. to 4:00 p.m. Eastern [1]. Fewer orders can mean wider spreads, bigger price swings and partial or no fills [1].
Key points
- Regular hours generally run 9:30 a.m. to 4:00 p.m. Eastern; extended hours trading is anything outside that window [1].
- Nasdaq's pre-market, regular and post-market sessions together run from 4:00 a.m. to 8:00 p.m. ET [5].
- Lower liquidity and higher volatility may result in wider than normal spreads after hours [1].
- An after-hours price may not match the next morning's opening price [1] [8].
- Brokers must give you a written risk disclosure before you trade in extended hours [1].
On this page
What are pre-market and after-hours trading?#
They are trading sessions outside the regular stock market day. FINRA Rule 2265 defines extended hours trading as trading outside regular trading hours, and says regular trading hours generally means 9:30 a.m. to 4:00 p.m. Eastern [1]. The session before the open is usually called pre-market, and the one after the close is called after-hours or post-market.
A 2008 SEC publication explained that electronic communications networks, or ECNs, gave everyday individual investors access to after-hours markets [2]. Whether you can trade in these sessions, and in which hours and with which order types, depends on your broker, so check yours.
When do the sessions run?#
Exchanges publish their own schedules, and brokers may offer only part of them. The table below uses the exchanges' own documents, all in Eastern Time. NYSE lists core trading from 9:30 a.m. to 4:00 p.m., with orders accepted from 6:30 a.m. and queued until the open; on the same page, its NYSE Arca market lists early trading from 4:00 a.m. and late trading until 8:00 p.m. [4]. A January 2026 Nasdaq filing describes its existing pre-market, regular and post-market sessions as running together from 4:00 a.m. to 8:00 p.m. ET [5].
| Session | Time (ET) | What to know |
|---|---|---|
| Nasdaq pre-market | 4:00 a.m. to 9:30 a.m. | Starts the Nasdaq day session; runs until the regular open |
| NYSE order entry | From 6:30 a.m. | Orders wait in a queue until the 9:30 a.m. open |
| Regular hours | 9:30 a.m. to 4:00 p.m. | The window FINRA's rule calls regular trading hours |
| Nasdaq post-market | 4:00 p.m. to 8:00 p.m. | Ends the Nasdaq day session |
| Nasdaq night session (approved) | 9:00 p.m. to 4:00 a.m. | SEC approved April 2026; Nasdaq set December 6, 2026 as the start |
Sources: FINRA Rule 2265 [1], NYSE hours page [4], Nasdaq filing in the Federal Register [5], SEC approval order [6], Nasdaq trader alert [7]. The pre-market and post-market boundaries combine Nasdaq's 4:00 a.m. to 8:00 p.m. day session with the 9:30 a.m. to 4:00 p.m. regular window. NYSE also lists early closes at 1:00 p.m. on some days [4].
Why do prices move so much outside regular hours?#
Because fewer people are trading, and company news can land then. FINRA's required disclosure lists the main risks: there may be lower liquidity, so your order may be only partly filled or not at all, and there may be greater volatility, so you may get a worse price than during regular hours [1]. The SEC's 2022 bulletin explains that there is generally less trading interest and so less price competition for most stocks, which generally results in wider spreads between bid and ask, or no quotes at all [8].
FINRA notes that companies make news announcements after regular trading hours that may affect their stock price, and that when such announcements occur during extended trading and combine with lower liquidity and higher volatility, they may cause an exaggerated and unsustainable effect on the price [1]. The same 2008 SEC publication adds that many after-hours traders are professionals with large institutions who may have access to more information [2].
How do you read an after-hours price on a stock page?#
Treat it as a rough early signal, not a settled price. Look at three things: the change, the volume and the spread. In our view, a big percentage move on very little volume says less than the same move during a busy regular session. If the page shows a bid and ask, a wide gap can be a sign that few orders are waiting. Our guides to the bid-ask spread and to volume and average volume show where those numbers sit on a quote.
- Regular-hours close
- $50.00hypothetical, example
- After-hours price
- $46.00 (-8%)change calculated
- Next-day open
- $48.00 (-4%)change from close, calculated
- Gap between the two
- +4.35%$46.00 to $48.00, calculated
How do you place a trade outside regular hours?#
- Check what your broker offers
Sessions, eligible stocks and order types differ by broker. The exchange schedule is the outer limit, not a promise of access.
- Read the risk disclosure
FINRA Rule 2265 bars a firm from letting you trade in extended hours until it has given you a disclosure statement about the risks [1].
- Look at the bid, ask and volume
The SEC says reduced trading interest generally results in wider spreads or no quotes at all [8].
- Ask what happens to unfilled orders
The SEC suggests checking whether an order not executed after hours is cancelled or carried into the next regular session [2].
Will U.S. stocks trade around the clock?#
Nearly, on Nasdaq, but check the current status before relying on it. In a filing published in the Federal Register on January 13, 2026, Nasdaq proposed a night session from 9:00 p.m. to 4:00 a.m. ET, with trading paused from 8:00 p.m. to 9:00 p.m. for maintenance and corporate actions [5]. The SEC approved the change, as amended, on April 10, 2026, but the order says Nasdaq will not start the night session unless the market data plans can collect and publish quotes and trades throughout it [6]. In an August 2026 trader alert, Nasdaq said it will introduce the 9 p.m. to 4 a.m. ET session on December 6, 2026 [7].
Longer hours do not remove the risks above. FINRA's disclosure rule covers any trading outside regular hours, and its warnings about lower liquidity, higher volatility and wider spreads apply to every extended session [1].
Mistakes beginners make with after-hours trading#
- Treating the after-hours price as the real price
Extended-hours prices may not reflect the next morning's open [1]. In the example above, the next-day open was 4.35% above the after-hours price (calculated).
- Ignoring the spread
Reduced trading interest generally means wider spreads or no quotes at all [8]. A wide gap is a cost you pay on entry.
- Assuming the order will fill
Lower liquidity can leave an order partly filled or not filled at all [1].
- Comparing prices across platforms
Prices on one extended-hours system may not reflect prices on other systems running at the same time [1].
Frequently asked questions#
What time does after-hours trading end?
On Nasdaq, the post-market session ends at 8:00 p.m. ET, per a 2026 Nasdaq filing [5]. Your broker may offer a shorter window, so check its schedule.
Why is the after-hours price different from the closing price?
Trading continues after the close with fewer participants, often after company news. FINRA notes that extended-hours prices may not reflect the prices at the end of regular hours [1].
Can I use a market order after hours?
It depends on your broker. The SEC's 2022 extended-hours bulletin said many brokerage firms accept only limit orders in extended hours [8]. Even where market orders are allowed, wide spreads make a limit order the more controlled choice.
Is after-hours trading riskier than regular trading?
It carries extra risks. FINRA requires brokers to warn about lower liquidity, higher volatility, changing prices, unlinked markets, news announcements and wider spreads in extended hours [1]. That does not make regular hours safe; stocks can lose value at any time.
The bottom line#
Pre-market and after-hours trading let prices react to news outside the 9:30 a.m. to 4:00 p.m. ET window, but with fewer orders, wider spreads and prices that may not hold. Read the after-hours figure on a stock page as an early signal, check volume and the spread, and use limit orders if you trade then. Start with how to read a stock quote, and read the risk disclosure first.
Sources
- 2265. Extended Hours Trading Risk Disclosure | FINRA.org.
- After-Hours Trading: Understanding the Risks.
- Understanding Market Liquidity and Your Investments.
- Holidays & Trading Hours.
- Self-Regulatory Organizations; The Nasdaq Stock Market LLC; Notice of Filing of Proposed Rule Change To Extend the Exchange's U.S. Equities Trading Hours to 23 Hours a Day, Five Days a Week.
- Order Granting Accelerated Approval of a Proposed Rule Change, as Amended by Amendment Nos. 2 and 3, to Extend the Exchange's Trading Hours to 23 Hours a Day, Five Days a Week (Release No. 34-105199).
- Equity Trader Alert #2026 - 46 Nasdaq Stock Market: New Trading Hours Effective December 6, 2026.
- Extended-Hours Trading: Investor Bulletin.
- Understanding Order Types | Investor.gov.
Education only. This page is not investment, tax or legal advice. Stocks can lose value. See our risk disclosure.
