What is momentum trading?

Momentum is the speed of a price move. A momentum trader does not ask whether a stock is cheap; they ask whether it is moving, with buyers clearly in control, and whether a stop sits close enough to make the trade worth taking. The tendency of strong stocks to keep outperforming for a while has been studied for decades, and so have its sudden crashes: it is a tendency, not a rule.

It runs on two clocks. Day traders look for stocks in play today, with news and unusual relative volume, often around a gap (see the gap trading strategy). Swing and position traders hold leaders for days to months; CAN SLIM is a well-known growth-stock version. Indicators such as the RSI and MACD measure momentum too, but most momentum traders start from price, volume and relative strength.

Relative strength: is the stock beating the market?

Relative strength compares a stock with its benchmark over the same period. Hypothetical, as in the drawing below: over twelve months the stock rises from 100 to 138 (+38%) while the index goes from 100 to 108 (+8%). The shaded gap is relative strength. The most telling moment is the middle of the chart: the market dips and the stock barely gives anything back.

Compare the stock with the index it trades against, usually SPY for large US stocks or QQQ for tech. The relative strength line (stock ÷ index), explained in the CAN SLIM lesson, shows the same thing as a single line. It is not the RSI, which measures one stock’s own speed.

Turn your phone sideways to read the drawing. Tap to close.

Two hand-drawn lines that both start at 100: the stock (green) climbs to the top right, and the market index (grey, dashed) rises slowly; the area between them is shaded and labeled the gap = relative strength. A dashed circle in the middle marks a dip in the market while the stock holds up, with the note market dips, the stock holds up.

Catalysts and volume: what starts a momentum move?

Strong moves usually start with news that changes what investors expect, and volume shows how many of them act on it.

In the drawing at the top of this page, the gap day trades about four times its average volume, a relative volume (RVOL) near 4. A catalyst on light volume is a weaker signal, and good news that was already expected can fade the same day. Common catalysts:

  • Earnings that beat expectations, especially with raised guidance; see how to read earnings reports.
  • A new product, a large contract or a regulatory approval.
  • A sector theme that lifts a whole group at once.
  • A breakout to a new 52-week or all-time high, with no trapped buyers waiting to sell just above.

How to enter a momentum trade: breakout or pullback

There are two standard entries, shown in the drawing below. The breakout buys a close above a base on heavy volume, with the stop under the breakout candle or the base. The pullback waits for the first dip to a rising short-term average, such as the 10- or 20-day, and buys the candle that closes back up, with the stop under the pullback low.

Hypothetical, a $20,000 account risking 1% ($200) per trade. Breakout: the base top is $51.00, the stock closes at $52.60 on about three times its usual volume, and the stop sits at $49.90, $2.70 below: 74 shares. Pullback: buy at $55.40 as a candle closes back up from the average, stop at $53.00, $2.40 below: 83 shares. Same dollar risk, different share counts; the position size calculator does the math.

The breakout gets in early but fails more abruptly; the pullback gives a tighter stop but may never come. The breakout trading strategy and the pullback trading strategy cover each one in detail. Both avoid buying a stock that is already far above its base or average, where the nearest sensible stop is a long way down.

Turn your phone sideways to read the drawing. Tap to close.

Two hand-drawn panels. Left, breakout entry: candles move sideways under a flat line, then one closes above it with a volume bar about three times taller than the rest; a buy triangle sits under it and a dotted red stop just below. Right, pullback entry: a rising trend pulls back to a rising orange average (circled), a candle closes back up with a buy triangle, and a dotted red stop sits under the pullback low.

How to manage the exit: trailing stops and partial profits

Check the earnings date before you buy: holding a momentum stock through a report is a separate decision with gap risk, not something to drift into.

After the entry, most exits are a stop that follows price up. Choose the method before the trade, and only ever raise the stop:

  • A close below the rising 10- or 20-day average.
  • Under each new higher swing low, as the stock builds its steps.
  • A multiple of the average true range below the highest close, which widens when the stock gets wilder.
  • Partial profits into strength, for example a third of the position at 2R, with the rest trailed.

Why momentum stocks reverse so sharply

Momentum attracts the same kind of buyer at the same time. When the move stretches far above its average, as in the drawing below, most of the people who wanted the stock already own it. A disappointing headline, a sector sell-off or simply a lack of new buyers is enough, and everyone heads for the same exit at once.

That is why the stop matters more than the entry. In the drawing, the trailing stop has climbed under the run, so the reversal gives back only part of the gain, but the next day opens with a gap below the stop. A stop order becomes a market order when triggered and fills at the next available price, which can be well below the level. Warning signs many traders watch:

  • Price far above the 10- or 20-day average, with daily ranges getting wider.
  • A huge-volume day with a long upper wick after a long run, often called a climax.
  • Good news that no longer lifts the stock.
  • The broad market turning down: most momentum stocks fall with it, often harder.

Turn your phone sideways to read the drawing. Tap to close.

A hand-drawn run that accelerates far above a rising orange average (an orange double arrow, note stretched far above the average), peaks with a long upper wick, then drops sharply (crowded exit: sharp drop). A dotted red trailing stop steps up under the run; the next candle opens with a gap below it, circled in red, with the note gap: the stop fills lower.