Chapters in Technical Analysis & Trading Tools
Chapter 6 of 10 · 4 min read
How stock screeners work
Screeners apply the same rule to every symbol in a universe such as the Nifty 500.
A screener evaluates a rule on every symbol after the close (or on the latest bar). Results are descriptive: they list names that matched technical criteria, not recommendations.
Always read why a filter matched. NR7, RSI and breakout rules measure different things, and a name appearing on many lists is not automatically stronger.
A sensible workflow
- Pick a scan that fits your time horizon.
- Shortlist, then open the chart and check volume and trend.
- Check fundamentals and news for risks.
- Backtest the rule before relying on it.
Key takeaways
- Screeners narrow the universe; they do not pick winners.
- Match the scan to your holding period.
- Validate on a chart and with a backtest.
Put it into practice
Open the live page on Market Intelligence and see this concept on real data.
Keep learning
- Backtesting: testing ideas on history · Technical Analysis & Trading Tools
- Alerts: let the market come to you · Technical Analysis & Trading Tools
Education only, not investment advice. Updated 2026-10-09.