The 4%+ single-day move count is the core breadth signal behind the WideRadar methodology. Here's what it measures, why it works, and how to read the daily up/down counts.
Every day, a handful of stocks move 4% or more in a single session. When many of them move 4%+ in the same direction on the same day, that is not random noise — it is institutions moving capital. The 4%+ move count is a daily census of that institutional footprint across the entire US equity universe.
On a strong trending day you might see 300 stocks move up 4%+ and only 40 move down 4%+. On a broad sell-off the ratio might invert: 250 down, 30 up. The ratio between those two counts — and how it evolves over days and weeks — is the single most actionable summary of market condition that the WideRadar breadth tab provides.
The 4% threshold is not arbitrary. It sits above the daily noise band that most liquid stocks experience from normal bid-ask variation and market-maker activity, but below the level where only thin, volatile stocks dominate the count. A 4%+ day on a mid- or large-cap name requires real buying pressure — it is unlikely to happen without significant volume behind it.
Smaller thresholds (1–2%) include too many random wiggles. Larger thresholds (10%+) are dominated by post-earnings gap-up stocks and miss the continuous accumulation signal that traders need. The 4% band captures the zone where institutional participation is necessary but not sufficient — exactly the right filter.
Before any stock is counted, it must clear a quality gate: a closing price above $3 before the move, and an average daily volume of at least 100,000 shares over the prior 35 days. This filters out the microcap and penny stocks that can dominate raw breadth counts during speculative phases.
The price gate applies to the pre-move price — so a stock that was $2.80 and jumps to $3.20 does NOT count, even though it closed above $3. Only stocks that were already investable before the move contribute. This is what makes the signal honest: it reflects real tradeable universe activity, not speculative froth.
The most powerful way to use the 4%+ count is as a rolling ratio. The WideRadar Breadth tab shows the 1-day, 5-day, and 10-day up/down ratio so you can see both the daily reading and the trend:
A single exceptional day can distort the daily ratio. That's why the 5-day and 10-day smoothed ratios are more reliable environment gauges — they reflect the cumulative pressure of the past week or two, not one outlier session.
No single metric tells the whole story. The 4%+ count works best when read alongside the advance-decline ratio (breadth width), the new highs/lows count (breadth depth), and the percentage of stocks above their 50- and 200-day moving averages (breadth structure). Together these four dimensions give you a full picture of whether the market's internal health supports continued upside or warns of a deterioration that the index hasn't yet confirmed.
The Breadth heatmap on WideRadar organises all of these columns — daily, 5-day, and 10-day — so you can scan the pattern at a glance rather than computing it yourself each day.
Sources & References
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