--- title: "Relative Strength Rank: Why RS 90+ Matters for Swing Traders" description: "RS Rank, Relative Strength, Screening" url: https://easyswing.trading/blog/relative-strength-rank-rs-90-swing-trading updated: 2026-03-28 --- # Relative Strength Rank: Why RS 90+ Matters for Swing Traders *6 min read | March 2026 | Tags: RS Rank, Relative Strength, Screening* ## What is Relative Strength (RS) Rank? Relative Strength (RS) rank measures a stock's **price performance relative to all other stocks** over a defined lookback period — typically 12 months (with the most recent quarter weighted more heavily in some versions). An RS rank of 90 means the stock has outperformed 90% of all stocks in the universe over that period. An RS rank of 99 means it's in the top 1%. This metric was popularised by William O'Neil and Investor's Business Daily (IBD), where it was called the **RS Rating**. Mark Minervini and others have validated it empirically: stocks with RS rank above 80–90 at the time of a major breakout have historically produced better returns than lower-ranked stocks. O'Neil's research on 600+ of the biggest stock market winners from 1953–2008 found that their **median RS rank was 87** before the start of their major price advances (*How to Make Money in Stocks*, 4th ed., 2009). ## Why High RS Rank Matters The intuition is straightforward: **stocks that are already outperforming tend to keep outperforming** — at least in the short to medium term. This is the momentum premium, one of the most well-documented anomalies in academic finance. For swing traders specifically: - High RS stocks are already being **accumulated by institutions** — you're following smart money - They tend to **hold up better in weak markets** (relative strength) - They're more likely to be **leaders in the next bull cycle**, not laggards catching up O'Neil's research on the biggest market winners found that most had RS ranks above 90 *before* their biggest price advances began. Jegadeesh and Titman's seminal 1993 paper "Returns to Buying Winners and Selling Losers" demonstrated that **momentum-based strategies (buying high-RS stocks) generated excess returns of 12.01% per year** over their study period — one of the most well-replicated findings in financial economics. ## RS Rank vs RS Line These are two different but related concepts that are often confused: **RS Rank** is a percentile score (0–99) comparing a stock to all other stocks. It's a snapshot. **RS Line** is a ratio line showing the stock's price divided by the S&P 500 (or another benchmark) over time. It shows whether the stock is *strengthening or weakening* relative to the market. A rising RS line is bullish; a falling RS line is bearish even if the stock's price is rising. EasySwing tracks both. The RS rank is shown as a badge (e.g., "RS 91") in scan results. A rising RS line trend is factored into the momentum score. ## The RS 90 Threshold in Practice Why 90 specifically? Research and practitioner experience suggest: - Stocks in the 80–90 range are "good" but not exceptional - Stocks in the 90–95 range are in the top tier of market leaders - Stocks in the 95–99 range are the current cycle leaders — these produce the biggest wins but also carry more risk of sharp reversals For a balanced swing trading approach, EasySwing uses RS ≥ 90 as a filter for high-conviction setups and RS ≥ 70 for a broader scan. The RS rank is prominently displayed in the scanner results as a coloured badge: - **Amber (RS 80–89):** Strong but watch for improvement - **Green (RS 90+):** Market leader territory ## RS Rank at the Pivot: The "RS Before the Breakout" Concept One nuance practitioners swear by: the **RS line making a new high before or at the same time as the price breakout** is a strong confirmation signal. This means the stock is showing relative strength *before* the obvious price breakout — a sign of institutional buying. EasySwing's breakout alert checks whether the RS line is at a 52-week high (or trending toward one) when a stock approaches its pivot point. ## RS Rank in Context: Avoid RS Fade Traps High RS rank alone isn't sufficient. Watch out for: - **RS fade:** A stock that had RS 95 six months ago but has drifted to RS 60 — it's losing momentum relative to the market - **Sector concentration:** Many high-RS stocks in a narrow sector can indicate a crowded trade - **Overextension:** A stock with RS 99 that's up 300% from its base may have limited near-term upside EasySwing combines RS rank with Stage 2 analysis, VCP pattern detection, and EPS quality to reduce these false signals. A stock needs to satisfy multiple criteria before it's surfaced as a high-confidence setup. ## How EasySwing Calculates RS Rank EasySwing calculates RS rank using daily closing price data from Alpaca for all stocks in its universe (2,000+ equities). The calculation: 1. For each stock, compute the **12-month price performance** (with the most recent 3 months weighted at 2×) 2. Rank all stocks from highest to lowest performance 3. Convert to a percentile (0–99) — rank 99 = top 1%, rank 0 = bottom 1% The calculation runs as part of the enrichment pipeline that refreshes twice daily (midday and after close), so RS ranks reflect the latest daily price action. ## Practical Checklist for Using RS Rank in Trade Selection - ✅ RS rank ≥ 90 for high-conviction entries; ≥ 70 for broader scan - ✅ RS line trending up over the past 3 months (not fading) - ✅ RS line at or near a 52-week high at time of breakout - ✅ RS rank has been stable or rising for the past 4–8 weeks (not a recent spike) - ❌ Avoid stocks where RS rank has dropped 10+ points in the past month - ❌ Avoid entries where RS line is below its 50-day average --- *EasySwing displays RS rank in real-time for every stock in the scanner. Combine RS 90+ with [Stage 2 analysis](/blog/stage-2-stock-analysis-minervini-uptrend) and [VCP pattern detection](/blog/vcp-setup-volatility-contraction-pattern) for the highest-conviction setups. Learn how to size your positions with [R-multiples](/blog/position-sizing-r-multiples-risk-management). Scan results are for informational purposes only. See our [Risk Disclaimer](/disclaimer).* --- *This is the LLM-optimized version. Human version: https://easyswing.trading/blog/relative-strength-rank-rs-90-swing-trading*