Pre-market trading
Pre-market trading is the session before the regular US market opens, from 4:00 a.m. to 9:30 a.m. Eastern Time. Fewer traders are active, so order books are thinner and spreads are wider, and most brokers accept only limit orders.
Why it matters to a small-cap momentum trader
For a small-cap momentum trader the morning starts here. News that breaks overnight or early in the morning hits before the bell, and the stocks that gap up on it show up on the pre-market gappers list with real volume behind them. The pre-market high and low become the levels traders plan the open around. The thin book cuts both ways: prices can jump on small orders, and a stop may fill far from where you set it.
The rules
Hours. 4:00 to 9:30 a.m. ET, then the opening auction at 9:30. After-hours trading runs from 4:00 to 8:00 p.m. ET. On an early-close day the regular session ends at 1:00 p.m.
Orders. Brokers typically take only limit orders in extended hours, and the order has to be marked to stay live outside the regular session.
No LULD bands. LULD bands apply only in regular hours, so a pre-market move has no band and no LULD pause.
Pre-market in Hindsight Markets
A replay can start at the 4:00 a.m. pre-market open, at the 9:30 bell, or at any time you choose. Extended hours take limit orders only, with Day+ to keep an order live outside regular hours, and the book, tape and scanners run through the pre-market as they did that day.
A worked example: what the spread costs before the bell
An illustration with made-up numbers, not a real stock or a real day.
7:45 a.m. A stock that closed at 2.00 is quoted 2.55 bid, 2.65 offer. You buy 1,000 shares at 2.65. If you had to sell straight away at the bid, you would get 2.55: a loss of 0.10 × 1,000 = 100 dollars, about 3.8% of the 2,650 dollars you paid, before the price has moved at all.
10:00 a.m. With far more traders in the stock, the spread might be one cent. The same round trip would then cost 10 dollars.
The wider the spread, the further the price has to move just to break even.
Common mistakes small-cap traders make in the pre-market
- Reaching for a market order. Most brokers refuse market orders outside regular hours, and where they are allowed, a thin book can fill them far from the last price.
- Forgetting the time in force. An order marked Day may not be live until 9:30. It has to be marked for extended hours to work in the pre-market.
- Counting on a stop. Many brokers do not trigger stop orders outside regular hours. Check yours, and plan an exit with a limit order.
- Trusting a pre-market high made on a few hundred shares. A level set on thin volume is easily broken at the open. A level with real volume behind it matters more.
- Spending your best decisions before 9:30. A run of trades at 7:00 a.m. can leave you tired, or down, when the open brings the volume.
Common questions
- What time does pre-market trading start?
- 4:00 a.m. Eastern Time on the main US venues. Some brokers open their pre-market later, such as 7:00 a.m., and a few also offer an overnight session.
- Can you trade in the pre-market?
- Yes, with most brokers, usually with limit orders only and with the order marked to work outside regular hours.
- Does the pre-market affect the opening price?
- It informs it but does not set it. The official open comes from the opening auction at 9:30, where queued buy and sell orders are matched. It often lands near the last pre-market price, but it can be well away from it.
- What are the pre-market high and low?
- The highest and lowest prices traded between 4:00 and 9:30 a.m. Momentum traders mark both as levels for the open: a break of the pre-market high is a common long entry.
- Why do pre-market prices move so much?
- Fewer traders are active, so the book is thin and a few orders can move the price a long way. There are no LULD bands before 9:30, so nothing pauses a fast move.
- Can a stock be halted in the pre-market?
- Not by LULD, whose bands are off before 9:30. An exchange can still halt a stock for pending news, and a halt called earlier stays in force until the exchange lifts it.
- Is heavy pre-market volume a good sign?
- It shows real interest, which a gap needs to hold. Judge it against the float: 2 million shares before the bell is a lot for a stock with a 5 million share float and very little for one with 200 million.
How to practise it in Hindsight Markets
- Open a past day at Pre-market 04:00.
- Run Top Gappers. Its gap follows the pre-market price, so the list fills in as the morning goes on; add the PM vol column to see which moves have shares behind them.
- Trade with limit orders and Day+. A market order is refused outside regular hours, with the reason.
- Watch the spread on Level 2 at 7:30 and again at 9:45.
- Draw a line at the pre-market high, then jump to 9:25 and watch the open treat it.
Practice this on a real past day in Hindsight Markets
Start a real past day at 4:00 a.m., watch the gappers build before the bell, and trade the pre-market with simulated money.