After-Hours Trading Explained: How It Works and What to Watch
After-hours trading is stock trading that happens after the regular market closes — in the US, roughly 4:00 to 8:00 p.m. ET. It's when most companies report earnings, so it's where you'll see the day's biggest surprise moves. But it runs on far lower volume than regular hours, which makes prices jumpier and less reliable.
What is after-hours trading?
After-hours trading lets investors buy and sell stocks through electronic markets after the regular session ends. Orders are matched on electronic communication networks (ECNs) rather than the main exchange. It exists so investors can react to news — especially earnings — that comes out after the 4:00 p.m. ET close instead of waiting for the next morning.
What time is after-hours trading?
In the US, after-hours trading generally runs from 4:00 p.m. to 8:00 p.m. ET, right after the 9:30 a.m.–4:00 p.m. regular session. The separate pre-market session runs from about 4:00 a.m. to 9:30 a.m. ET. Exact windows vary by broker — some offer narrower hours.
Why do stocks move so much after hours?
Two reasons: timing and thin volume. Most companies release earnings and major news after the close, so the biggest reactions happen then. And because far fewer shares trade after hours, even modest orders can swing the price sharply — a stock can jump 10% after hours and give much of it back by the next open.
The risks of after-hours trading
- Low liquidity — fewer buyers and sellers mean it can be hard to trade at a fair price.
- Wider spreads — the gap between bid and ask is larger, so you pay more to get in or out.
- Volatile, unreliable prices — big after-hours moves often don't hold into the next session.
- Limited order types — many brokers only allow limit orders after hours.
How to use after-hours moves (step by step)
- Scan the biggest after-hours movers and identify the catalyst — usually earnings.
- Read the actual result, not just the price reaction — how did revenue, guidance and margins look?
- Treat the after-hours price as provisional — wait to see whether the move holds at the next open.
- Check the fundamentals or grade before acting on the headline.
- Use limit orders if you do trade, to control the price you pay in thin markets.
After-hours vs pre-market
They're the two 'extended-hours' sessions. After-hours follows the close (4:00–8:00 p.m. ET) and is dominated by earnings reactions; pre-market precedes the open (4:00–9:30 a.m. ET) and reflects overnight news. See our pre-market research routine for the morning side. You can track both free: after-hours movers and pre-market movers.