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Relative Strength

Relative strength measures how a stock is performing compared to a benchmark or its peers — a way to rank leaders versus laggards.

In one line: Relative strength measures how a stock is performing compared to a benchmark or its peers — a way to rank leaders versus laggards.

What it is

Relative strength (RS) compares one security's performance to a benchmark — usually a broad index like the S&P 500 — or to its sector peers. A stock with high relative strength is outperforming; one with low RS is lagging. It answers a simple question: of everything I could own, what is actually leading right now?

Don't confuse this with RSI. Relative strength compares a stock to something else. The Relative Strength Index (RSI) compares a stock to its own recent history. Same words, different tools.

How it works

The simplest RS measure is a ratio: divide the stock's price by the index level and watch the line. When the RS line rises, the stock is outperforming the index; when it falls, it's lagging — regardless of whether the absolute price is up or down.

Many systems rank an entire universe by trailing performance (say, 3- and 6-month returns) into a percentile score. A name in the top decile is a strong leader; the bottom decile, a laggard. This ranking is a core input to most stock signals and to momentum strategies.

Worked example

Example

Over three months the S&P 500 rises 4%. Stock A rises 12%; Stock B rises 1%. Both are 'up,' but Stock A has strong relative strength (it beat the market by 8 points) and Stock B has weak relative strength (it lagged by 3). A relative-strength approach favors A — the leader — and avoids or shorts the laggard, on the observation that leadership tends to persist for a while.

Why it matters

Relative strength is one of the most durable, well-documented effects in markets: strong stocks have historically tended to keep outperforming over intermediate horizons before mean-reverting. It's why professionals watch leadership and breadth, not just the index level.

Entry Point Trading ranks its universe by relative strength every day and shows you where the leadership sits — part of the daily signal, graded in the open. No performance claims; the record is being built in public.

Keep learning

Related concepts

RSI (Relative Strength Index)
A momentum oscillator for overbought/oversold reads.
Momentum Investing
Buying strength, on the tendency of trends to persist.
Market Breadth
Measuring how many stocks participate in a move, not just the index.
Moving Averages
Smoothing price to see the trend beneath the noise.
Stock Signal
A structured buy/sell/hold call — and what a good one must include.
Breakout Trading
Trading a move through a defined level on rising participation.

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Common questions

FAQ

Is relative strength the same as RSI?
No — and this is the most common mix-up. Relative strength compares a stock to another asset or index. RSI (the Relative Strength Index) is a bounded 0–100 oscillator that compares a stock to its own recent gains and losses. Different tools that unfortunately share a name.
Does relative strength predict the future?
No indicator predicts the future. Relative strength describes a persistent tendency — leaders often keep leading for a while — but trends end. It's a probabilistic edge to be combined with risk management, not a guarantee.

Learn the process by watching it live — free.

Entry Point Trading's free daily signal shows the concepts on this page applied to real names — scored tickers, macro context, and calls we grade in the open, hits and misses. It's the fastest way to see how it actually works.

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