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Defining the OR (5/15/30 min)

Which OR to use and when.

8 min · Intermediate · Free lesson

What you'll learn

  • Define the opening range for 5, 15 and 30 minutes after the 9:30 a.m. ET open.
  • Choose the right OR length based on the stock's activity and the width of the range.
  • Mark the OR high, low and midpoint and plan around them.

The idea

The US stock market opens at 9:30 a.m. Eastern Time. The first minutes after the bell are the most active of the day. Overnight news, premarket orders and the first reactions of big funds all hit the market at once. The high and low printed during that early window form the opening range (OR).

The OR matters because it captures the first real agreement on price for the day. A move that breaks out of it and holds often signals which side won the opening fight. A move that breaks out and fails often traps traders who jumped too early.

Think of the OR as the first round of a boxing match. Both fighters test each other. You learn a lot from watching it, but you do not bet the house before it ends.

How it works

The OR is simply the high and low of the first set period after 9:30 a.m. ET, including wicks:

  • 5-minute OR: 9:30 to 9:35. Useful on high-relative-volume stocks gapping on news, where moves are fast. It is small and triggers early, but it produces more fakeouts.
  • 15-minute OR: 9:30 to 9:45. A good default for liquid large caps such as AAPL, NVDA or AMD. It filters much of the opening noise.
  • 30-minute OR: 9:30 to 10:00. Useful for slower names, for index ETFs like SPY and QQQ, and on days with a lot of early chop.

Rules for defining and using it:

  1. Wait for the period to finish. No OR trades until the OR is complete.
  2. Mark three lines: OR high (ORH), OR low (ORL) and the midpoint.
  3. Keep premarket levels separate. The premarket high and low are important levels, but they are not the OR. Mark them as targets or obstacles.
  4. Check the width against the stock's average daily range (ATR). If the OR already covers more than about half of the typical day's range, there may be little room left for a breakout. Consider a shorter OR or a different setup.
  5. Stay out of the middle. Price chopping inside the OR is not a trade. The action is at the edges.

Worked example

Hypothetical AAPL. Its average daily range (14-day ATR) is about $4.00. Yesterday's high was $199.80.

  • 5-minute OR: $196.20 to $197.00. Width $0.80, about 20% of ATR.
  • 15-minute OR: $195.80 to $197.40. Width $1.60, about 40% of ATR.
  • 30-minute OR: $195.50 to $198.20. Width $2.70, about 68% of ATR.

The 5-minute OR is very tight and likely to fake out. The 30-minute OR already uses most of a normal day's range. The 15-minute OR is the balanced choice. Its midpoint is ($195.80 + $197.40) / 2 = $196.60.

Plan: if AAPL breaks above $197.40 and confirms (the next lessons cover how), a long could enter around $197.60 with a stop at $196.55, just under the midpoint. Risk is $1.05. The next level is yesterday's high at $199.80, a reward of $2.20, about 2.1R. With a $25,000 account risking 1% ($250), size is $250 / $1.05 = 238 shares. That is about $47,000 of stock, which requires margin buying power; if you do not have it, the smaller size you can afford simply risks less than 1%.

Common mistakes

  • Trading before the OR is complete — you trade noise, not a range — wait for the full period to close.
  • Using the premarket high as the OR high — they are different levels with different meaning — mark them separately.
  • Picking a wide OR on a slow stock — little room remains for the breakout — check OR width against ATR.
  • Trading inside the range — the middle of the OR is random — only act at the edges.

Checklist

  • Have I chosen 5, 15 or 30 minutes before the open?
  • Did I wait for the OR period to finish?
  • Are ORH, ORL and midpoint marked?
  • Are premarket high and low marked separately?
  • Is the OR width reasonable compared with the stock's ATR?

Practice: Three ORs, one stock

  1. Open Simulation Lab and load a recent session of a liquid stock starting at 9:30 a.m. ET, with hidden candles.
  2. Mark the premarket high and low, yesterday's high and low, and the stock's average daily range.
  3. Advance to 9:35, 9:45 and 10:00, marking the 5-, 15- and 30-minute ORs and each midpoint.
  4. Calculate each OR's width as a percentage of the average daily range and choose one in your Trade Journal.
  5. Reveal the rest of the session and note which OR gave the cleanest break.

Key takeaways

  • The OR is the high and low of the first 5, 15 or 30 minutes after the 9:30 a.m. ET open.
  • Shorter ORs trigger sooner but fake out more; longer ORs are cleaner but leave less room.
  • The 15-minute OR is a solid default for liquid large caps.
  • Mark ORH, ORL and midpoint, and keep premarket levels separate.
  • Compare OR width with the stock's average daily range before planning a breakout.

Glossary

  • Opening range (OR) — The high and low of a set period after the 9:30 a.m. ET open, such as the first 5, 15 or 30 minutes.
  • OR midpoint — The price halfway between the OR high and OR low.
  • ATR (average true range) — A measure of a stock's typical daily price range over recent days.

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