1 The Edge — why it works
Fresh news plus high relative volume
A stock that gaps overnight on a real catalyst — earnings, an FDA decision, guidance — arrives at the open with urgent, motivated participation that a normal session lacks.
When that gap holds and price breaks the opening range in the gap's direction on high relative volume, it signals the move is being continued, not faded. You are trading alongside a crowd that has a clear reason to act, with risk defined by the opening range.
2 Where it works — and doesn't
Real catalysts, real volume
Works best when…
- A genuine, fresh catalyst drove the gap.
- Relative volume is far above normal for the time of day.
- The gap holds and price breaks the opening range with it.
- Wide enough range and liquidity to trade cleanly.
Fails / avoid when…
- A gap with no real news (likely to fill).
- Average volume — no crowd, no follow-through.
- Price immediately fades back into the prior close.
- Illiquid small-caps where spreads and halts dominate.
3 Setup checklist
All true before you act
- ✓A fresh catalyst. A clear, dated reason the stock gapped this morning.
- ✓High relative volume. RVOL well above 1 — unusual, confirmed interest.
- ✓The gap holds. Price does not immediately sink back toward yesterday's close.
- ✓Opening-range break. Price clears the first few minutes' range in the gap's direction.
- ✓Tradable structure. Adequate liquidity and a defined range to risk against.
★ Selection (Ross Cameron's criteria)
What makes a gapper worth trading
Ross Cameron of Warrior Trading filters gappers by four criteria: a low float (under 100M, ideally under 20M shares), high relative volume (2×+, often 5×), a news catalyst, and a strong unobstructed chart — usually priced $1–$20. His entry is the first candle to make a new high after a 2–3 candle pullback (a bull flag), with the stop at the pullback low.
Source: Warrior Trading · see Stock Selection & Scanning and the Ross Cameron profile. Day trading is high-risk; most day traders lose money.
4 The process
From signal to managed trade
Entry
Enter on the break of the opening-range high (for an up gap) once the gap has held.
Stop (1R)
Below the opening range, or below VWAP for a tighter version. Entry − stop = 1R.
Position size
Risk a small fixed % of the account; shares = risk ÷ 1R. Gappers move fast — size for the wider stop, not the hope.
Exit & management
Trail under higher lows and scale out into +2R/+3R. Watch for the gap fill as a warning the move is over.
5 Worked example (illustrative)
One trade, start to finish, in R
| Account / risk per trade | $25,000 · 1% = $250 |
| Prior close | $99.00 |
| Entry (opening-range break) | $104.20 |
| Stop (below the range) — 1R | $102.90 · 1R = $1.30/share |
| Position size = $250 ÷ $1.30 | ≈ 192 shares |
| Continuation to +3R | $108.10 |
| If it works: +3R | + $749 (≈ +3.0%) |
| If it fails: −1R | − $250 (≈ −1.0%) |
6 Honest expectancy
High energy, high risk
Gappers are volatile: stops can slip and reversals are sharp. The edge depends on demanding both a real catalyst and high relative volume, and on small, fixed risk so the occasional fast loss stays survivable.
Example: win 40% at +3R, lose 60% at −1R → (0.40 × 3) − (0.60 × 1) = +0.6R per trade. An expectation, never a guarantee.
7 Make it yours
Test before you trade
A no-risk validation routine
Build a morning routine: each day, list stocks gapping on news with high RVOL, then in replay mark the opening range, the break entry, the stop, and the result in R. Track how the "real catalyst + high RVOL" subset performs versus newsless gaps — the difference is the edge.
8 Common mistakes
How traders blow this up
- Trading newsless gaps. Without a catalyst, gaps tend to fill — the opposite trade.
- Ignoring relative volume. Low RVOL means no crowd and no follow-through.
- Chasing far above the range. A distant entry means a huge stop and poor reward/risk.
- No plan for halts. Fast movers can halt; size so a gap through your stop is survivable.
- Marrying the trade. When the gap starts filling, the move is likely done.