Premarket trading is the buying and selling of stocks before the regular U.S. stock market opens at 9:30 a.m. Eastern Time. It is part of extended-hours trading and lets investors respond to overnight news, earnings reports, economic data and international market movements before the regular session begins.
Premarket trading can create early opportunities, but it usually has less liquidity, wider bid-ask spreads and greater price volatility than regular-hours trading.
Premarket Trading at a Glance
| Feature | Premarket trading |
|---|---|
| Regular U.S. market opens | 9:30 a.m. ET |
| Common retail trading window | Varies by broker, often 7:00 a.m. to 9:30 a.m. ET |
| Nasdaq-defined premarket session | 4:00 a.m. to 9:30 a.m. ET |
| Typical order type | Limit orders are commonly required |
| Main benefit | Responding to news before the market opens |
| Main risk | An order may receive a poor price, fill partially or remain unfilled |
Nasdaq defines its premarket session as 4:00 a.m. to 9:30 a.m. ET. Individual brokers may offer only part of that period, so investors should check their broker's hours, eligible securities and order rules.
How Does Premarket Trading Work?
Premarket orders are placed through a brokerage account that supports extended-hours trading. Depending on the broker and stock, the broker may route an order to an exchange, alternative trading system or another trading venue. These venues may not be connected in the same way as the regular market.
A typical premarket trade works like this:
- Enable extended-hours trading in your brokerage account.
- Select the stock and choose the premarket or extended-hours session.
- Submit an order, usually a limit order.
- Your broker routes the order to an available trading venue.
- The order executes only if another participant is willing to trade at your specified price.
A limit order lets you buy at a specified price or lower, or sell at a specified price or higher. It does not guarantee that the trade will happen. If the stock does not reach your limit price, the order may remain unfilled.
What Is the Difference Between Premarket and Regular Trading?
Regular U.S. stock trading runs from 9:30 a.m. to 4:00 p.m. ET. Premarket trading takes place before 9:30 a.m. ET, while after-hours trading generally runs from 4:00 p.m. to 8:00 p.m. ET. Broker schedules can differ.
| Trading session | Typical U.S. hours | Market conditions |
|---|---|---|
| Premarket | Before 9:30 a.m. ET | Lower trading activity and wider spreads are common |
| Regular session | 9:30 a.m. to 4:00 p.m. ET | Liquidity is generally deeper and price competition is stronger |
| After-hours | 4:00 p.m. to 8:00 p.m. ET | Lower liquidity and higher volatility are common |
Premarket prices do not set the official previous-day closing price or guarantee the stock's opening price at 9:30 a.m. ET. New orders, news and institutional trading can change the balance between buyers and sellers before the regular session opens.
Why Do Investors Trade Before the Market Opens?
Investors trade before the open to respond to information released outside regular market hours.
Examples include:
- A company reports quarterly earnings before the open.
- A company announces a merger, product launch or management change.
- The government releases economic data.
- An overseas market experiences a major price move.
- An analyst changes a stock rating.
- Geopolitical or industry news affects investor sentiment.
Premarket trading gives investors a way to place orders before the broader market reacts. It does not mean that the premarket trend will continue after 9:30 a.m. ET.
What Are the Main Risks of Premarket Trading?
Lower Liquidity
Premarket trading usually has fewer buyers and sellers than regular-hours trading. A stock may be harder to buy or sell quickly, and an order may fill only partially or not at all.
Wider Bid-Ask Spreads
The bid is the highest price a buyer is offering. The ask is the lowest price a seller is willing to accept. When fewer people are trading, the gap between these prices can widen, raising the cost of entering or leaving a position.
Greater Volatility
A single news announcement can cause a large price move when relatively few shares are trading. Premarket prices can move sharply in either direction.
An Unreliable Indication of the Opening Price
A stock trading higher before the open may still open lower at 9:30 a.m. ET. New orders, news and institutional trading can change market conditions before the regular session begins. Premarket activity does not determine the next day's official opening price.
Trading Venues May Not Be Linked
Prices shown on one extended-hours trading system may differ from prices available on another. The National Best Bid and Offer framework used during regular trading hours does not operate in the same way during extended hours.
Limited Order Types and Securities
Some brokers restrict premarket trading to limit orders, offer only selected stocks or cancel unfilled orders when the session ends. Stock options generally have limited or no extended-hours availability compared with stocks.
Is Premarket Trading Suitable for Beginners?
Premarket trading is usually not the best default for beginners. Regular trading hours generally offer more liquidity, narrower spreads and more competitive pricing. Premarket trading may suit an investor who understands limit orders, accepts the possibility of partial execution and has a specific reason to trade before the open.
If you trade before the open:
- Use a limit order instead of assuming a market order will receive a reasonable price.
- Check your broker's premarket hours and eligible securities.
- Find out whether unfilled orders are canceled or carried into regular trading.
- Review the bid-ask spread before submitting an order.
- Do not treat a premarket price as a guaranteed opening price.
- Consider waiting until regular hours if the trade is not time-sensitive.