Most traders assume they understand gaps — until a stock opens 4% higher, immediately surges another 3%, and they're left watching from the sidelines wondering what just happened. The confusion usually isn't about spotting the gap. It's about not knowing why price sometimes rockets further in the gap's direction instead of filling back in.

A gap occurs when a security's opening price is meaningfully different from the previous session's closing price. This happens overnight when news, earnings, or macro events shift sentiment before the market opens. The "go" part refers to when that momentum continues in the same direction as the gap — up gaps keep climbing, down gaps keep falling — rather than reversing to close the space left on the chart.

CONCEPTA gap and go occurs when opening momentum accelerates in the gap's direction — the price doesn't retrace, it extends.
WARNINGNot every gap continues — gap fills are equally common. Trading gaps without a directional filter is a fast way to lose capital.
KEY IDEAVolume at the open is the single most useful filter for separating genuine gap and go setups from traps.

Picture a stock that closed at $10.00 on Tuesday. Overnight, it reports strong earnings. Wednesday's open is $11.20 — a $1.20 gap, or 12%. In a gap and go, price doesn't dip back toward $10.00. Instead, within the first 30 minutes, it pushes to $11.80, then $12.40. Traders who recognised the setup early are already in. Everyone else is chasing.

$10.00 $11.00 $12.00 $13.00 Tue Close Wed Open +30 min +60 min GAP $11.20 $11.80 $12.40 Gap Fill Gap & Go Gap Fill

What separates a genuine gap and go from a trap is context. Traders examine pre-market volume, the catalyst behind the gap, and whether the broader market is supportive. A stock gapping up on three times its average overnight volume, driven by a concrete earnings beat, behaves differently from one that drifted higher on thin pre-market noise. Recognising that difference is the whole skill. For deeper reading on how these mechanics are classified, Investopedia's guide to gaps covers the full taxonomy of common, breakaway, runaway and exhaustion gaps. The statistical context of gap behaviour over time is also well documented on Wikipedia's chart pattern reference, and Investopedia's pre-market trading explainer adds useful detail on why volume before the bell matters so much.

A gap without volume is just a rumour. A gap with volume and a catalyst is a story the market is actively telling — and the gap and go mechanic is simply learning to read it before the chapter ends.

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