⭐Relative Strength: How to Find the Market's Leading Stocks

Not every stock moves the same way in a bull market. Some surge ahead of the crowd while others drag their feet — and knowing which is which before a breakout happens is one of the most useful edges a swing trader can develop. Relative strength is the tool that separates the leaders from the laggards, and learning to use it can sharpen every watchlist you build.

What Relative Strength Actually Measures

Relative strength (RS) compares how a stock is performing against a benchmark — usually the S&P 500 ETF, SPY. It answers a simple question: is this stock keeping up with the market, beating it, or falling behind?

The idea is straightforward. If SPY is up 5% over the past three months and a stock is up 15% over the same period, that stock has strong relative strength — it's outpacing the broader market. If that same stock is up only 2%, it's lagging, which is a red flag regardless of how good the chart looks in isolation.

Important clarification up front: Relative strength (RS) is not the same as RSI. RSI (Relative Strength Index) is a momentum oscillator that measures a stock's recent price changes against itself — overbought vs. oversold conditions on a 0-to-100 scale. RS, by contrast, compares one stock's performance against an external benchmark like SPY. The two indicators have similar-sounding names but measure completely different things. We'll revisit this distinction later, but keep it in mind as you read.

How the RS Line Is Calculated and Plotted

The RS line is calculated by dividing a stock's price by the price of the benchmark (usually SPY) at each point in time. The result is a ratio, and when you plot that ratio as a line over time, you get a picture of whether the stock is gaining or losing ground relative to the market.

Here's a simple example. Suppose SPY is trading at $500 and a stock you're watching is at $100. The RS ratio is 100 / 500 = 0.20. A month later, SPY climbs to $520 (up 4%) and your stock climbs to $115 (up 15%). The new RS ratio is 115 / 520 = 0.221. The ratio went up, meaning the stock outperformed SPY over that month — and the RS line would be rising.

When the RS line is trending upward, the stock is strengthening relative to the market. When it's trending downward, the stock is weakening — even if the price chart looks fine on its own. A stock can be in an uptrend on an absolute basis while still lagging the market, and that distinction matters enormously for finding the best setups.

Most charting platforms display the RS line as a secondary panel below the price chart. SetupSignals calculates and surfaces RS data automatically, so subscribers don't have to build it manually.

Why RS New Highs Before Price New Highs Are Bullish

One of the most powerful signals in relative strength analysis is when the RS line makes a new high before the stock's price does. This is sometimes called an RS new high, and it often foreshadows a breakout.

Here's the logic: if a stock's RS line is already at a new high, that means it's already beating the market even before its price has fully broken out. Institutions — funds, pension managers, large traders — are accumulating the stock, which is why it's holding up so well even when the broader market isn't driving it. When the price finally does break out to a new high, those buyers are already on board, providing fuel for the move.

Think of it like a race. You wouldn't bet on a runner who's been falling behind all week to suddenly win on race day. You'd look for the runner who's been quietly moving to the front of the pack. RS new highs are that signal — the stock is already showing leadership behavior before the crowd catches on.

The inverse is also true. A stock whose RS line is making new lows while the price is near its highs is flashing a warning. Buyers aren't as committed as the chart makes it appear. When the market softens, these stocks tend to fall harder and faster than leaders do.

Using RS to Filter Your Watchlist: Trade Leaders, Not Laggards

Relative strength is one of the most practical filters you can apply to a watchlist. Instead of chasing every breakout you see, you narrow your focus to stocks that are already demonstrating market leadership.

A practical approach looks like this:

1. Start with a universe of stocks near technical breakout levels — bases forming near 52-week highs, cup-and-handle patterns, flag consolidations.
2. Apply an RS filter. Look for stocks whose RS line is trending upward and ideally making new highs. Cut anything whose RS line is flat or declining.
3. From the filtered list, look for confirmation from price action — is volume picking up? Is the stock holding above key moving averages?

This process won't give you a long list — and that's the point. A focused watchlist of five to ten stocks with strong RS is far more actionable than a bloated list of fifty mediocre setups.

The principle here is simple: trade the leaders, not the laggards. In a given sector, only a handful of stocks tend to do the heavy lifting. Buying the second- or third-best stock in a sector because it's "cheaper" is one of the most common mistakes beginners make. The leader is the leader because money keeps flowing into it.

For more on how to approach stock setups from a swing-trading perspective, see How to Trade Stock Setups.

The Minervini Trend Template: A Systematic RS-Based Screening Framework

Mark Minervini, a two-time U.S. Investing Champion, developed what he calls the Trend Template — a set of eight criteria that define a stock in a strong, institutional-quality uptrend. While the template isn't exclusively about relative strength, RS is one of its defining components, and the full framework is worth understanding.

The Minervini Trend Template requires all of the following:

1. The stock is above its 150-day (30-week) and 200-day (40-week) moving averages.
2. The 150-day moving average is above the 200-day moving average.
3. The 200-day moving average has been trending upward for at least one month.
4. The 50-day (10-week) moving average is above both the 150-day and 200-day moving averages.
5. The stock's current price is above the 50-day moving average.
6. The stock is at least 25% above its 52-week low.
7. The stock is within 25% of its 52-week high (ideally within 15%).
8. The stock's relative strength ranking is 70 or higher — meaning it has outperformed at least 70% of all stocks over the past year.

The eighth criterion is pure relative strength. Minervini is explicitly filtering for stocks that have been beating the market, not just individual momentum. When a stock clears all eight criteria, it signals that institutions are actively accumulating and the trend has the kind of broad support needed to sustain a breakout.

What makes this framework valuable for intermediate traders is that it's mechanical. You either meet the criteria or you don't. There's no guesswork about whether a chart "looks right." You're applying a disciplined filter that removes weak stocks before they waste your time.

SetupSignals incorporates the Minervini trend template as one of its screener filters on paid plans, so subscribers can instantly identify which signals are coming from stocks that pass all eight criteria. You can read more about moving averages and how they work in Moving Averages: SMA vs EMA.

RS vs. RSI: Clearing Up the Confusion

This distinction is important enough to revisit directly. Beginners frequently confuse relative strength (RS) with the Relative Strength Index (RSI), and the confusion can lead to using the wrong tool for the wrong job.

Relative Strength (RS): Compares a stock's performance to an external benchmark, typically SPY. It's a ratio — stock price divided by benchmark price — plotted over time. It tells you whether a stock is outperforming or underperforming the market. There's no fixed scale; the line simply rises or falls relative to its own history.

RSI (Relative Strength Index): A momentum oscillator developed by J. Welles Wilder in 1978. It compares a stock's average gains to its average losses over a lookback period (usually 14 days) and expresses the result on a 0-to-100 scale. RSI measures internal momentum — how fast and how far the stock has moved relative to itself. It does not compare the stock to any external benchmark.

A stock can have a rising RS line (beating SPY) while also showing a low RSI reading (pulling back internally). These are complementary tools, not interchangeable ones.

When screening for leaders, start with RS. It gives you the broadest filter: is this stock actually winning in the current market? Once you've narrowed to leaders, RSI and other momentum tools help you time entries within those leaders' charts. You can learn more about RSI specifically in The RSI Indicator.

Practical Workflow: Finding Strong Stocks with RS

Here's a concrete workflow you can apply tonight after the close:

• Step 1: Pull up a list of stocks near 52-week highs or in recognizable base patterns. Focus on stocks at least 25% above their 52-week low but within 15% of the 52-week high — the Minervini zone.
• Step 2: Check each stock's RS line. Is it trending up? Has it made a new high recently, even if the price hasn't yet? Eliminate anything where the RS line is flat or declining.
• Step 3: Apply the Minervini trend template checklist. Does the moving average stack look right?
• Step 4: Compare within sectors. If two stocks both pass the above filters, prioritize the one with the stronger RS line.
• Step 5: Watch for a low-risk entry — a tight consolidation near the buy point, ideally on declining volume, followed by a breakout on expanding volume.

If you're just getting started with swing trading in general, What Is Swing Trading? is a good place to begin before diving into RS-based screening.

The Bottom Line

Relative strength is one of the most reliable ways to identify the stocks worth trading before the crowd piles in. By comparing a stock's performance to SPY, tracking whether the RS line is making new highs, and applying a systematic framework like the Minervini trend template, you can consistently narrow your focus to the market's true leaders rather than chasing second-rate setups.

Remember: RS and RSI are different tools. RS tells you whether a stock is beating the market; RSI tells you about a stock's internal momentum. Use them together — RS to filter for leaders, RSI to help time entries within those leaders.

SetupSignals scans approximately 2,500 stocks every day after the US market close and surfaces RS line data, RS new highs, and Minervini trend template qualifications on paid plans — so you can spend less time screening and more time focused on the setups that actually meet the standard.

This article is educational only and does not constitute financial advice. Past performance does not guarantee future results. Always conduct your own research before making any investment decisions.