Buying well is half the job. The other half, often the harder one, is selling: cutting losers before they become large, and holding winners long enough to matter without giving back most of the gain. Growth traders accept a low hit rate, often below half of all trades, because a few large winners pay for many small losses. That only works if the losses stay small and the winners are allowed to run. This lesson sets out rules for both, and for the sizing that ties them together.
Cut every loss short
The first rule is defensive: decide the exit before you buy, and take it without debate. Many growth traders cap any loss at 7–8% below the entry and aim to exit sooner when a stock acts poorly. Others place the stop under a nearby structure, such as the last tight low of the base, or a multiple of the average true range (see ATR stops). Whatever the method, the stop is set when the trade is planned, not after the stock starts falling.
The reason is arithmetic. Losses compound against you: a 10% loss needs an 11% gain to recover, a 33% loss needs 50%, and a 50% loss needs 100%. A string of small losses is an ordinary cost of the method; a single large loss can undo months of work.
Two corollaries follow. Never add to a losing position to lower the average cost; that turns a small mistake into a large one. And remember that a stop is not a guarantee: a stock can gap through it, most often on earnings, so the actual loss can exceed the plan.
Sizing and concentration
The stop defines the risk per share; sizing turns it into risk per trade. Choose a fixed share of the account to risk on each trade, commonly 0.5–1%, and divide it by the distance from entry to stop. That keeps every loss at the planned amount, however volatile the stock. The Learn article on stop-loss and position sizing covers the method and R multiples.
Many growth traders also cap the size of any single position, often at 20–25% of the account, and hold a concentrated portfolio of perhaps four to eight stocks in a strong market rather than dozens. Concentration lets the best ideas matter, but it only works with strict stops. Note that several stocks from one industry are largely a single bet: they tend to rise and fall together.
Build positions in steps. A common approach buys a first portion at the buy point and adds smaller amounts only if the stock rises a few percent while still within the buy zone. Adding to winners, never to losers, keeps the largest positions in the stocks that are proving you right.
Selling into strength
Growth traders have long observed that many successful breakouts advance about 20–25% before they pause or pull back. Many therefore take part of the profit in that range, which locks in gains and keeps the account growing even when leaders later give back ground. There is a well-known exception: a stock that rises 20% or more within the first two or three weeks after its breakout is showing unusual strength, and growth traders often hold such a stock for at least several weeks, because the fastest starters tend to become the biggest winners.
The other strength signal is the climax run, the final, fastest stage of a long advance. Typical signs, usually after many months of gains:
- the largest daily and weekly price gains since the advance began, often several up days in a row;
- the widest daily ranges, and gaps up that come late in the move;
- the heaviest volume of the advance, with the price far above its 200-day average;
- a burst of enthusiastic coverage and a crowded consensus.
Selling into a climax feels wrong because the stock is at its strongest. But climax runs often mark the top, and the reversal from them can be swift.
Selling into weakness
A trailing rule protects the gains you do not sell into strength. For growth leaders the most common is the 50-day moving average: as long as the stock holds above it, the trend is intact; a decisive close below it on heavy volume, especially the first one after a long advance, is a signal to sell the rest. Other warnings include a breakdown in the RS line, a new price high without a new RS high, several heavy-volume down days in a row, and a gap down on earnings.
Plan around earnings as well. A new position with little profit cushion faces gap risk on its first report; many traders trim or exit before the report unless the gain already exceeds a normal post-earnings move, which the options market prices as the expected move.
How to apply it
- Entry: size each buy so that a hit stop costs about 0.5–1% of the account, and keep any single position within about 20–25% of it.
- Stop: set it before buying, at most 7–8% below the entry or under the nearest structure; never lower it, and never add to a loser.
- Target: consider selling part at +20–25%, unless the stock gained 20% within about three weeks of the breakout; sell more into climax signs.
- Invalidation: exit the rest on a heavy-volume close below the 50-day average, a breakdown in the RS line or a heavy-volume gap down on earnings.
- Review: measure each trade in R, the multiple of the initial risk, so losses and gains are compared on the same scale (see risk-reward ratio).
The trend-following course treats stops and sizing in more depth in stops and position sizing.
Common mistakes
- Moving the stop lower. A stop that moves is not a stop.
- Averaging down. Leaders rarely need rescuing; laggards rarely deserve it.
- Selling the best stock too early. A fast start after a breakout is a reason to hold, not to cash in.
- Riding a winner back to a loss. Without a trailing rule, a 30% gain can become a loss.
- Oversized, correlated positions. Five stocks from one group are one large position.
In Clear Tape
Every preset in trading systems states its stop and exit. Volume Base Breakout stops at the higher of 8% below the entry and one cent under the 10-day low, takes profit at +20% and exits on a close below the 50-day average on above-average volume. Volume Pivot exits on any close below the 50-day average. RS New High and the Leader Trend Filter use an ATR trailing stop, the highest high of the last 22 sessions minus 3 × ATR(22), which only moves up. Each signal comes with its entry and stop, and R is defined as the entry minus the stop.
Backtests let you choose the risk per trade, from 0.1% to 5% of equity; they start from a $100,000 account, cap any position at 20% of equity and report each trade's R, the average R and expectancy after costs. Clear Tape's own trade alerts state their stop and target. In Clear Cut, risk flags mark a stock more than 15% above its 20-day average and one with earnings within 5 sessions. Watchlist screening and backtests are available to Tools and Pro members; trade alerts to Pro members.
Summary
Keep every loss small with a stop set before buying, size positions so that a stop costs a fixed small share of the account, and concentrate only as far as your stops allow. Take part of the profit into strength around 20–25%, hold the fastest starters longer, sell into climax runs, and trail the rest with the 50-day average. The method works because the rules on both sides are applied every time.
For educational purposes only. Not investment advice.