The tape opens, and suddenly, your favorite stock isn't where it closed yesterday. It's either blasted higher or cratered lower, leaving a blank spot on the chart. That's a gap. Most retail guys see a gap and just see a jump; I see a market telling a story, and you need to know how to read it.
Why Stocks Gap
Gaps happen when there's a significant imbalance between buyers and sellers overnight or over a weekend. News, earnings, or a macro event drops, and by the time the market reopens, the price everyone's willing to transact at has shifted dramatically. It's a re-pricing event. The critical mistake most make is treating all gaps the same.
The Three Types of Gaps (and How to Spot Them)
Not all gaps are created equal. Some signal real conviction; others are just noise. Here’s the breakdown:
1. Breakaway Gaps: The Real Deal
A breakaway gap is your signal that something fundamental has shifted. It usually happens after a long consolidation or at the end of a major chart pattern. Price busts out of a range with a huge jump, and here's the kicker: volume is massive. We're talking 2x, 3x, even 5x average daily volume. If you see a gap up on monster volume after a base, that's the tape telling you the trend has started. The crowd often dismisses these as 'overbought,' but that's precisely when the smart money is getting positioned. I don't trust a breakaway without the volume confirmation.
- Key Read: High volume on the gap day. It means conviction.
- Filling the Gap? Unlikely. These often don't fill, or if they do, it's a shallow retest of the top of the range before continuing.
2. Runaway Gaps: The Trend Is Your Friend
Runaway gaps, also called measuring gaps, pop up in the middle of an established trend. Price is already moving, then it gaps in the direction of that trend. These gaps signal an acceleration of momentum. Think of it as the market taking a breather, then catching a second wind. Volume here is usually strong, but not necessarily the blowout volume you'd see with a breakaway. The easy money on these is often already made if you weren't in the trend, but they confirm the direction.
- Key Read: Occurs mid-trend, confirming momentum. Volume is solid.
- Filling the Gap? Possible, but often serves as support. If it fills, I'd expect it to hold there before the trend resumes.
3. Exhaustion Gaps: The Trap
This is where the crowd gets caught. An exhaustion gap is a final hurrah, a last gasp of a trend. It happens near the end of a long, sustained move, often after a parabolic run. Price gaps up (or down) on high volume, just like a breakaway, but then the momentum quickly fizzles. The stock struggles to hold the gains, often reversing within a few days or even the same day. The high volume here isn't conviction; it's distribution, the smart money selling into the retail frenzy. This is the classic 'blow-off top' signal. If you're chasing here, you're buying someone else's exit.
- Key Read: Occurs at the end of an extended trend. High volume, but price can't hold it.
- Filling the Gap? Very likely. These gaps almost always fill, often starting a reversal.
The 'Gap Fill' Myth (and the Reality)
Everyone talks about gaps 'filling.' The idea is that price always revisits the level of the gap. While many gaps do fill, it's not a law of physics, and it certainly isn't immediate. Breakaway gaps often don't fill, or they take forever. Exhaustion gaps almost always fill, and quickly. The real read isn't whether it fills, but why it's filling and what kind of gap it is. A gap fill can be a retest of a new support/resistance level, or it can be a complete reversal of the initial move.
My take? Don't blindly trade the fill. Understand the type of gap, what the volume is telling you, and the context of the overall trend. That's how you separate the signal from the noise and keep your capital from becoming someone else's profit.