Skip to main content
Version: Current

Opening Range Breakout (ORB) Strategies

The opening-range breakout (ORB) is a publicly documented technical-analysis method popularized by trader Toby Crabel in his book Day Trading with Short Term Price Patterns and Opening Range Breakout (1990). It's not a BigShort invention — it's an established piece of trading literature that BigShort has built scanning and charting tools around. This article covers the general Crabel/ORB methodology: the opening range itself, how to trade a break of it, the volatility-contraction setups that make a breakout more reliable, and the best-case Golden Trend Day outcome. For the mechanics of BigShort's own scanner built on top of it, see the Toby Crabel tab guide.

📝 Not the same as the First-Bar Momo Scalp. BigShort also has a First-Bar Momo Scalp setup that trades the first few minutes of the session — but it reads the MomoFlow order-flow bar and fades or rides it. That's a completely different mechanic (who's trading) from ORB (where price is). This article is about Crabel's price-range method only.

What Is the Opening Range?​

The opening range (OR) is simply the high and low of a defined window at the start of the session. That window isn't fixed to one length — it's a variable in Crabel's method, and different traders pick different intervals for it. 5, 15, 30, and 60 minutes are all common choices in ORB practice: a shorter window (5 or 15 minutes) reacts faster and produces more setups, but is noisier and more prone to false breaks; a longer window (30 or 60 minutes) fires less often but each range tends to be more significant once it's established. It's the same underlying strategy at every interval — only how wide you draw the opening range changes.

📝 BigShort's own tooling is built around the first 5 minutes. The Toby Crabel tab's Zarattini in-play screen, Stretch trigger, and ORB/ORB TIME columns are all keyed to the open-to-9:35-ET window specifically — that's the interval its live scanning and confirmation are built on. If you trade a longer opening range (15/30/60-minute), the mechanics below still apply, but you'd be marking the range and confirming the break yourself rather than reading it off the tab's live columns.

Once your chosen OR bar closes, you have two levels:

  • OR High — the high of the opening-range bar
  • OR Low — the low of the opening-range bar

Entry Logic​

  1. Mark the OR high and OR low the moment your opening-range bar closes.
  2. Wait for a "stretch," not just a touch. A single tick above the OR high isn't a breakout in Crabel's method — you want confirmation that price has moved a minimum distance beyond the level. For the standard 5-minute window, BigShort's Toby Crabel tab surfaces this as the Stretch and Stretch % columns on its setups table, so you don't have to eyeball the distance yourself; on a longer OR window you'd judge the stretch distance manually.
  3. Long trigger: price trades through OR High + stretch. Short trigger: price trades through OR Low − stretch.

💡 Tip: Crabel's own research (and the BigShort community's read of it) treats a breakout as more reliable when the prior session showed volatility contraction — an inside day (ID), an NR4, or an NR7. See The Coiled Spring below; the two are meant to be read together, not separately.

Stop Placement​

The textbook Crabel stop is the opposite side of the opening range:

  • Long trade: stop below the OR low.
  • Short trade: stop above the OR high.

The logic is simple — if price breaks back through the other side of the range you just broke out of, the setup has likely failed. Some traders tighten this (to breakeven after a partial, or to a level just past the entry) depending on their own risk tolerance; just be aware that a stop placed too close to your entry, inside a still-forming range, is prone to getting shaken out on ordinary noise.

Exit and Target Framing​

Crabel-style ORB trades are usually managed with one (or a mix) of these general approaches:

  • Measured-move target: project the width of the opening range from the breakout point. A range that stretched $1 wide, broken to the upside, projects a first target roughly $1 above the breakout level. This is a standard range-projection technique in ORB literature, not a guarantee of where price will actually go.
  • Trailing exit: trail your stop under (for longs) or over (for shorts) the low/high of each subsequent bar on your OR timeframe as the move develops.
  • Time-boxed decision window: BigShort's on-chart Toby Crabel OR mode shades the opening range ± the stretch zone only until 09:45 ET — after that, the tab treats the setup as having missed its breakout window for the day. Many ORB traders use a similar cutoff: no valid stretch-confirmed break by a set time means the setup didn't play out, and it's time to move on rather than force an entry.
  • Partial + runner or full exit at target are both valid — which one fits depends on your own risk management, same as any breakout trade.

The Coiled Spring: Volatility Contraction Before Expansion​

Crabel's core observation is that periods of unusually low volatility tend to precede periods of high volatility — a "coiled spring" effect. A quiet session isn't a reason to stop paying attention; in Crabel's framework, it's often exactly when to start.

Three classic patterns flag that contraction:

  • Inside Day (ID): the entire day's range fits inside the prior day's range — a session that failed to make either a new high or a new low relative to the day before.
  • NR4 (Narrowest Range in 4 days): today's range is the tightest of the last four sessions.
  • NR7 (Narrowest Range in 7 days): today's range is the tightest of the last seven sessions.

Crabel's research treated these as pre-conditions for a higher-probability breakout the following session — the idea being that the tighter and more compressed the range gets, the more energy is stored for the eventual expansion. Combining conditions (an inside day that's also an NR4 or NR7) is a higher-conviction version of the same signal, since it stacks two independent readings of the same contraction.

💡 Tip: These definitions, and the live scanning for them, are covered in full on the Toby Crabel tab — its ID, NR4, NR7, ID + NR4, and ID + NR7 filters do exactly this screening for you across the market, with a live count of qualifying names under each button.

Trading the Contraction → Expansion Sequence​

The basic playbook Crabel's method implies:

  1. Identify contraction at the prior day's close — a name flagged as ID, NR4, or NR7 (ideally a combination of these).
  2. Build a watchlist from those names heading into the next session.
  3. Watch the open for a stretch-confirmed break of the opening range on that watchlist — see Entry Logic above.
  4. Confirm with volume, since a "breakout" without real participation behind it is a common source of false signals. BigShort's Toby Crabel tab pairs its setup filters with the Zarattini in-play screen, which ranks symbols by opening relative volume (RELVOL) against their own 14-day average — a high RELVOL reading on a contraction setup is the combination the tab is built to surface.

The Golden Trend Day​

The best-case outcome an ORB trader is hoping the contraction/expansion sequence produces is what's often called a Golden Trend Day in Crabel/ORB literature — a session that:

  • Opens near one extreme of its eventual range (near the day's high or low, not in the middle),
  • Trends in that same direction for most or all of the session, and
  • Shows minimal retracement along the way — pullbacks stay shallow and the trend rarely threatens to reverse.

On a true Golden Trend Day, an opening-range breakout entered early can be held through the session rather than scalped for a quick target, since the day simply doesn't give back much on the way.

⚠️ Important — be honest about hindsight: A Golden Trend Day is far easier to recognize after the fact than to call in advance. The pattern is a description of what a great trend session looks like once it's finished, not a signal that reliably predicts one is starting. A stretch-confirmed breakout out of a genuine volatility contraction improves the odds you're looking at the start of one, but plenty of ORB setups resolve into an ordinary, choppy, or reversing day instead. Treat "this might be turning into a Golden Trend Day" as something you notice building as the session unfolds — via a clean, low-retracement trend after your entry — rather than something you should assume going in. Manage the trade with normal stops and trailing logic regardless; if it turns out to be a Golden Trend Day, your trailing stop will keep you in for the ride.

How BigShort Surfaces This​

The Toby Crabel tab (app.bigshort.com/toby) is the scanner built around this exact methodology:

  • Setup filters (ID, NR4, NR7, ID + NR4, ID + NR7, T20) with live qualifying counts, so you can build your contraction watchlist pre-market.
  • The Zarattini in-play screen to confirm which of those names are actually attracting opening volume and which direction they're breaking (RELVOL, 9:35%, % CHANGE, ORB, ORB TIME columns).
  • The Setups table (Symbol, Signal, Stretch, Stretch %, Money Flow) for the specific trigger distance and flow behind each name.
  • The main chart's Toby Crabel OR mode, which shades the opening-range/stretch zone until the 09:45 ET decision window, so you can watch an individual name's setup resolve — and see whether it's shaping up into a trend day — right on the candles.

Risk Notes & Caveats​

  • ⚠️ Important: Crabel's published research draws on historical futures and equity data from his own study; BigShort has not independently re-verified specific historical hit-rate figures from that work for today's markets or for any individual ticker. Treat the mechanics here as established, general technical-analysis practice — not a BigShort-exclusive edge or a promise about your own results.
  • False breakouts happen, especially on names without a volatility-contraction precondition (ID/NR4/NR7) behind them, or where the "breakout" isn't backed by real volume — that's exactly what the Zarattini in-play table's RELVOL column is there to help you check.
  • Golden Trend Days are, by definition, uncommon. Don't structure every ORB trade around the assumption that today is one.
  • As with any breakout method, size your position to the stop distance, not the other way around.
See Also
Last updated on