Trading term

What is Momentum?

Momentum measures the speed and strength of a price move — how fast price is changing, rather than its level. Strong momentum means a trend is accelerating; fading momentum warns it's losing steam, often before price itself turns. It's the force behind 'the trend is your friend.'

In markets, momentum is the rate of change of price: a market pushing to new highs on ever-larger moves has strong momentum, while one grinding higher on smaller and smaller gains is losing it. Momentum indicators — from a simple rate-of-change line to RSI, MACD and the stochastic — all try to capture this force, typically oscillating around a zero or midpoint line. Above the line, upward momentum; below, downward.

The core idea is that momentum often shifts before price does. A rally that keeps rising while its momentum quietly weakens (a divergence) is a classic early warning of a stall. Momentum also underpins a whole style — 'momentum investing' — that buys strength and sells weakness, betting that what's moving keeps moving. The catch is that momentum can reverse sharply, so it's a fast, unforgiving signal.

Fading momentum: a divergence
PRICEhigher highsMOMENTUMlower peaks → momentum fading

Price grinds to higher highs while the momentum oscillator makes lower peaks. The trend is still up, but its fading momentum warns the move is running out of fuel.

For example

A stock keeps making new highs, but each new high comes on a smaller momentum reading than the last — the trend is still up, yet its fading momentum warns the rally is running out of fuel.

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Why it matters to you

Momentum gives you an early read on a trend's health that price alone hides: a market can still be rising while the force behind it drains away. Catching that shift — via divergence or a momentum roll-over — is what lets traders exit near the top or avoid buying an exhausted move, rather than reacting after the reversal.

⚠ Strong momentum can reverse fast

Momentum rewards riding strength — until it snaps. Because it measures speed, a momentum move can look unstoppable right before it exhausts and reverses violently (a 'momentum crash'). Chasing a parabolic move on the assumption that strong momentum must continue is how late buyers get caught at the top.

Frequently asked questions

What's the difference between momentum and trend?

Trend is the direction price is moving; momentum is the speed and strength of that move. A trend can still be up while its momentum fades — the direction hasn't changed, but the force behind it is weakening, which often warns the trend is close to stalling.

How do you measure momentum?

With momentum indicators, most of which measure the rate of change of price and oscillate around a centre line. Simple rate-of-change, RSI, MACD and the stochastic are all momentum tools. Above the centre line is upward momentum; below it, downward. Divergences between price and the indicator are key signals.

What is momentum investing?

Momentum investing buys securities showing strong recent performance and sells or avoids weak ones, betting that trends persist — 'the trend is your friend.' It's backed by decades of research, but it's vulnerable to sharp reversals when momentum crashes.

Can momentum predict a reversal?

It can give early warning. When price makes a new high or low but momentum doesn't confirm it — a divergence — it often signals the move is losing strength and may be near a turn. Momentum shifts frequently precede price reversals, though the timing is never exact.

Related terms

Ascending triangleAn ascending triangle is a bullish continuation pattern: a flat horizontal resistance line on top, with a rising trendline of higher lows beneath it. As the higher lows squeeze price against the ceiling, pressure builds — and it usually resolves with a breakout up through the resistance.ATR (Average True Range)ATR (Average True Range) measures how much a security typically moves in a period — its volatility — as an average of recent trading ranges. It doesn't say which direction price is heading, only how far it tends to travel, which makes it a core tool for stop-losses and position size.Bollinger BandsBollinger Bands wrap a price chart in three lines: a middle moving average with an upper and lower band set two standard deviations away. The bands widen when volatility rises and squeeze together when it falls, framing whether price is relatively high or low.BreakdownA breakdown is when price falls decisively through a support level it had been holding above — the bearish mirror of a breakout. It signals sellers have overwhelmed the buyers defending support, and often triggers a fast move lower as stops and new sellers pile in.
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