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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.

🎥 Opening Range Breakout (ORB)

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 contains two separate indicators inside of the Toby Crabel tab: The Zarattini in-play screener and the Toby Crabel screener. The Zarattini focuses on a breakout of the first 5-minute opening range for stocks with high relative volume. Toby Crabel has his own criteria explained below.

Once your chosen OR time-frame closes, you have two levels:

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

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.

Zarattini 5-min ORB​

🎥 Zarattini ORB

Stock Selection

  • Opening price > $5
  • Average Trading Volume over previous 14 days > 1m shares/day
  • ATR over last 14 days > $0.5
  • Relative Volume (RVOL) of 1st 5 min candle of day > 100%

Trading Strategy

  • Trade top 20 RVOL stocks
  • Enter on the break of 5 min OR in the direction of 1st 5 min candle.
    • ❗If 1st candle is Doji: NO TRADE
  • Stop loss at 10% of ATR
  • Close position end of day
  • Max risk = 1% of Acct
🎥 Zarattini Strategy Video

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 - AKA 'Free Money Days'​

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.
  • High of Day typically happens in power-hour.

Golden Trend Criteria​

  • 1-hour Opening Range
  • High/Low must be broken by 12 Eastern.
  • Break is convincing - 2-3 consecutive candles in direction of break with significant price movement & minimal wicks.

Entry & Exit Criteria

After confirmed Golden ORB, wait for pullback to & successful retest of 20 SMA for entry.

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.

🎥 Video with Tae about Golden Trend Days

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​

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