What it is
A base is a period of sideways price action, typically 4 to 12 weeks, in which a stock trades in a narrowing range after an advance. The breakout is the close above the base's high. This playbook buys that breakout when volume confirms it, places the stop below the last pivot low inside the base, and holds for either a measured move equal to the base's height or a trailing stop. It is the classic growth-stock setup, popularised by decades of "cup and handle" literature.
The logic
A base forms when supply and demand are in balance: holders who want to sell have mostly sold, buyers who want to buy are absorbing them, and volatility contracts. The breakout marks the point where demand exceeds the remaining supply. Because the base's high is a visible level, the breakout triggers resting buy stops from short sellers and buy orders from momentum funds and systematic breakout strategies simultaneously, which is why volume matters: a breakout without volume means those participants did not show up.
On the other side are sellers who anchored to the base high as "resistance" and short sellers betting on a failed breakout. When the base is genuine, their selling is absorbed within days and their covering pushes the second leg.
Setup rules
- Market: stocks with average daily dollar volume above $20 million; sector ETFs; index futures on weekly bases.
- Timeframe: daily chart for the base and trigger; weekly chart for the prior trend.
- Base conditions: at least 20 trading days; depth (high to low) less than 25 percent; the last 5 days' range less than half the base's total range (tightening); the stock's 50-day average above its 200-day.
- Breakout conditions: daily close above the base high; volume at least 1.5x the 50-day average; the breakout day closes in the top third of its range; the broad market is not in a confirmed downtrend.
- Disqualifiers: the base has already produced a failed breakout within the past 2 weeks; earnings due within 5 days.
Entry, stop, target
Buy on the breakout close, or with a buy-stop a few cents above the base high if you must enter intraday. Stop under the most recent pivot low inside the base (often 5 to 8 percent below the entry). Target 1 is the base height projected from the breakout; target 2 is trailed under the 20-day EMA on a closing basis.
| Item | Level | Notes |
|---|---|---|
| Base high | 50.00 | 8-week base |
| Base low | 42.00 | Height 8.00, depth 16 percent |
| Last pivot low | 46.80 | |
| Entry | 50.30 | Breakout close, volume 1.8x |
| Stop | 46.50 | Below pivot, risk 3.80 |
| Target 1 | 58.00 | Base height projected, reward 7.70, 2R |
| Trailed exit | 20-day EMA | Often 3 to 6R on the best names |
If the stock closes back inside the base within 5 days, exit regardless of the stop; that is a failed breakout and the failed-breakout-reversal traders now have the edge.
Position sizing and risk
The stop is wide in percentage terms, so the position is small in dollar terms; a 7.5 percent stop with 1 percent risk means 13 percent of equity in the position. Compute it at /tools/position-size and keep the number of simultaneous breakouts limited by portfolio-heat per /learn/risk-management. Breakouts cluster: when the market is strong you will see ten in a week, and they will all fail together if the market turns.
What breaks it
- Bear markets and choppy markets. Breakouts fail at very high rates when the index is below its 200-day average or churning. The single biggest improvement to breakout results is not trading them in those regimes.
- Edge decay. Breakout trading is heavily systematised. Many breakouts now are faded by algorithms in the first hour and only succeed after a shakeout, which is why the 5-day close-back rule rather than the intraday stop is used.
- Costs. Modest; the position is held for weeks. The real cost is the frequent small loss: 55 to 65 percent of base breakouts fail, and the expectancy comes from the 10 percent that run.
- Gaps. A stock that gaps up 8 percent above the base on the breakout day has no reasonable stop; skip it.
- Drawdowns. Losing streaks of 8 to 10 consecutive failed breakouts occur in every choppy year.
How to test it
Define the base and breakout algorithmically and run it over at least 15 years of daily data on a survivorship-free universe. Record each breakout's outcome at 5, 20 and 60 days and under your exit rules. Split results by market regime and by base depth; you will likely find that tight, shallow bases in rising markets are the only category with a meaningful edge. Require at least 1,000 breakouts, which the rules will produce easily. Then trade the setup on paper through at least one full market correction before committing capital.
Variations
- Cup with handle: a base with a rounded bottom and a short final pullback; the handle low is the stop.
- Flat base of 5 weeks or more with depth under 15 percent; tighter stop, fewer signals.
- Weekly inside-bar version: see weekly-inside-bar-breakout.
- Relative strength filter: only take breakouts in stocks outperforming the index over 3 months; see relative-strength-rotation.
Further reading
breakout, fakeout, retest, resistance, relative-volume, flag-pattern, portfolio-heat, survivorship-bias, bull-trap, expectancy.
Related playbooks: weekly-inside-bar-breakout, failed-breakout-reversal, ema-pullback-trend, relative-strength-rotation