What Is After-Hours Trading?
After-hours trading lets you buy and sell stocks outside regular market hours (9:30 AM - 4 PM ET). Learn how it works, the risks, and who should use it.
Definition
After-hours trading refers to buying and selling stocks outside the regular market session, which runs from 9:30 AM to 4:00 PM Eastern Time. Most brokerages offer two extended sessions: pre-market (typically 4:00-9:30 AM ET) and after-hours (4:00-8:00 PM ET). These sessions use electronic communication networks (ECNs) rather than traditional exchanges.
During extended hours, trading volume is dramatically lower -- often 90% less than during regular hours. This means wider bid-ask spreads, higher volatility, and the risk that the price you see is not the price you get. Only limit orders are typically available during extended hours; market orders are usually not allowed because the low volume makes them too risky.
After-hours trading gained popularity because companies often release earnings reports after the market closes. Traders who want to react to good or bad news immediately, rather than waiting until the next morning, use after-hours sessions. However, price movements during extended hours often reverse by the next morning when full volume returns.
Real-World Example
A company reports earnings at 4:15 PM, beating expectations. The stock jumps 12% in after-hours trading on relatively low volume. Excited traders pile in. By the next morning, the stock opens only 6% higher as more participants assess the news. The after-hours price overstated the move. Conversely, bad earnings might cause a 10% after-hours drop that stabilizes to a 5% decline by morning. After-hours prices are directional signals, not reliable valuations.
Why It Matters
After-hours trading can be useful for reacting to significant news, but it is a riskier environment than regular hours. Wider spreads, lower volume, and higher volatility mean you are more likely to get a bad fill. Most long-term investors have no need to trade after hours -- the news will still be there in the morning when the full market is active and prices are more reliable.
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Frequently Asked Questions
Can anyone trade after hours?
Most major brokerages (Fidelity, Schwab, TD Ameritrade) offer after-hours trading to retail investors. You may need to acknowledge additional risk disclosures and agree to use limit orders only.
Is after-hours trading risky?
Yes, more so than regular hours. Lower volume leads to wider spreads and more price volatility. Prices can swing dramatically on relatively small trades and may not reflect the true value the next morning.
Why do stocks move after hours?
Earnings reports, guidance updates, FDA decisions, merger announcements, and breaking news are the most common catalysts. Companies often time major announcements for after the market closes.
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