What is the opening range breakout strategy?

Mark the high and low of the first minutes after the open, then buy a break above the high or short a break below the low, with a stop back inside the range. It trades the side that wins the open.

What time frame is best for an opening range breakout?

There is no single answer. Small-cap traders often use the first 1 or 5 minutes because their stocks move fast; traders of larger stocks and index funds often use 15 or 30 minutes.

What is the success rate of the ORB strategy?

It depends on the stocks, the range length, the stop and the market, and any single number quoted for it describes one test, not your trading. Replaying many opens and recording your own results is the honest way to find out.

Does the opening range include the pre-market?

Usually not. The opening range starts at the 9:30 a.m. ET open. The pre-market high and low are separate levels that many traders mark beside it.

Can you short an opening range breakdown?

Yes, by shorting a break below the range low. On a small cap check the borrow and SSR first: a stock already down 10% can only be shorted above the bid.

Glossary

Opening range breakout (ORB)

An opening range breakout is a trade on a stock breaking out of the high or low it set in the first minutes after the 9:30 a.m. ET open, commonly the first 1, 5, 15 or 30 minutes. Traders buy a break above the opening range high, or short a break below its low, with a stop back inside or on the other side of the range.

Why it matters to a small-cap momentum trader

The first minutes after the bell bring the day's heaviest trading, as overnight orders, the opening auction and the pre-market crowd meet the regular-hours crowd. The range that forms in those minutes is the market's first agreement on price. A break out of it, on volume, says one side has won the open. On a gapper with news, a break above the opening range high is often the start of the morning's main move; a break below it can mean the gap is fading.

How it is traded

The range. The high and low of the first N minutes after 9:30. Small-cap traders often use 1 or 5 minutes; slower stocks and larger caps, 15 or 30.

Long entry. A trade above the range high, ideally on a candle closing above it with rising volume.

Stop. Back inside the range, at its midpoint, or below the range low. The wider stop means smaller size.

Target. Often a multiple of the range's height measured from the break, or the next level above, such as the pre-market high.

The short side is the mirror image: below the range low, with a stop back inside. On a small cap, shorting the break below can run into SSR and borrow limits, so many small-cap traders take only the long side.

Opening ranges in Hindsight Markets

Start a replay at the 9:30 bell and the opening range forms candle by candle, from the real auction and the real first trades. Any interval from one second up is available, so a 1-minute and a 5-minute range can sit side by side.

A worked example: a 5-minute opening range

An illustration with made-up numbers, not a real stock or a real day.

The range. From 9:30 to 9:35 a gapper trades between 4.20 and 4.60. The range is 0.40 high, and its midpoint is 4.40.

The trade. At 9:38 a candle closes at 4.66 on rising volume. You buy at 4.66 with a stop at the midpoint, 4.40. Risk = 4.66 − 4.40 = 0.26 a share.

The target. One range height above the break: 4.60 + 0.40 = 5.00. From the entry that pays 5.00 − 4.66 = 0.34, about 1.3 times the risk.

With the full range as the stop. A stop under 4.20 would risk 0.46, so the same dollar risk buys a little more than half the shares.

Common mistakes small-cap traders make with the ORB

Trading every opening range. The setup works best on a stock with news and high relative volume. A quiet stock's range breaks back and forth.
Buying the first tick through the high. Opening breaks fake out often. Waiting for a candle to close outside the range costs a little and saves many false starts.
Using a range too wide for your size. On a volatile small cap the 5-minute range can be large. Work out the risk before the break, not after.
Forgetting the pre-market high. A break of the opening range right into the pre-market high meets sellers at once. Know where it is.

Common questions

What is the opening range breakout strategy?: Mark the high and low of the first minutes after the open, then buy a break above the high or short a break below the low, with a stop back inside the range. It trades the side that wins the open.
What time frame is best for an opening range breakout?: There is no single answer. Small-cap traders often use the first 1 or 5 minutes because their stocks move fast; traders of larger stocks and index funds often use 15 or 30 minutes.
What is the success rate of the ORB strategy?: It depends on the stocks, the range length, the stop and the market, and any single number quoted for it describes one test, not your trading. Replaying many opens and recording your own results is the honest way to find out.
Does the opening range include the pre-market?: Usually not. The opening range starts at the 9:30 a.m. ET open. The pre-market high and low are separate levels that many traders mark beside it.
Can you short an opening range breakdown?: Yes, by shorting a break below the range low. On a small cap check the borrow and SSR first: a stock already down 10% can only be shorted above the bid.

How to practise it in Hindsight Markets

Open a past trading day at the 9:30 bell and run the Top Gappers scan, with the Relative volume column.
Put a mover on a 1-minute and a 5-minute chart, and draw a rectangle over the first five minutes' high and low.
When a candle closes above the range, buy with a bracket order, so the stop and the target go in with the entry.
Watch the break on the tape and Level 2, and note whether the first candle outside the range holds.
Replay several opens, file the trades under one playbook, and compare their R multiples in the journal.

Practice this on a real past day in Hindsight Markets

Start a real past day at the 9:30 bell, mark the opening range as it forms, and trade the break with a stop on the other side.