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How to Use a Stock Screener

A stock screener turns thousands of listed companies into a short, focused list you can actually research. Here is what a screener is, how it works, and how to use one well.

What is a stock screener?

A stock screener is a tool that filters a large universe of stocks down to those that match criteria you choose. India's exchanges list thousands of companies, and no one can review them all by hand. Instead of starting from scratch, you tell the screener what you care about — a valuation range, a momentum reading, a particular sector, or a compliance status — and it returns only the names that fit.

Think of it as a filter, not a recommendation engine. The screener does not tell you what to buy; it narrows the field so your research time goes to a manageable shortlist rather than the whole market.

How does a stock screener work?

Under the hood, a screener stores a set of attributes for every stock — price history, fundamental ratios, sector tags, model scores, and so on. When you set a filter such as “price-to-earnings below 20” or “positive momentum”, the screener scans every stock and keeps only the rows that satisfy your condition. Combine several filters and the conditions stack, so each one shrinks the list further.

The quality of a screener depends on the data behind it and the range of filters it offers. A good screener lets you combine fundamental, technical, and quantitative criteria in one place, then jump straight to a detailed page for any name that passes.

How to use a stock screener step by step

  1. Start with a research question. Are you studying undervalued large caps, names with strong momentum, or only Sharia-compliant stocks? Your question decides your filters.
  2. Apply a few filters, not dozens. Two or three well-chosen criteria usually produce a usable shortlist. Over-filtering can leave you with nothing.
  3. Review the shortlist. A screener tells you which stocks pass — it does not tell you why. Open each candidate and read its fundamentals, signals, and institutional-activity indicators.
  4. Iterate. Loosen or tighten filters based on what you find. Screening is the start of research, not the end.

Common filters and what they mean

  • Valuation — ratios like P/E or P/B that compare price to fundamentals.
  • Momentum — recent return strength relative to other stocks.
  • Sector — restrict results to industries you want to study.
  • Quantitative score — a model's descriptive ranking of a stock.
  • Sharia compliance — whether a stock is tagged as halal-compliant.

On Ansaar, the equity screener lets you combine these in one view across more than 2,000 NSE stocks, including a dedicated halal filter.

Try it

Put this into practice on the Ansaar equity screener. Browse individual names on the instruments page, then deepen your understanding with the guides below.

Related guides

Educational research, not investment advice.