What is a stock screening methodology and how do professional analysts build screens?

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AcadiFi · Accepted Answer

Stock screening is a systematic process of filtering a large universe of equities using quantitative criteria to identify a manageable set of candidates for deeper fundamental analysis. **Typical screening process:** \`\`\`mermaid flowchart TD A[Define Investment Universe -- e.g. S&P 500] --> B[Apply Valuation Filters] B --> C[Apply Quality Filters] C --> D[Apply Momentum/Growth Filters] D --> E[Apply Liquidity Filters] E --> F[Resulting Short List -- 20-40 stocks] F --> G[Deep Fundamental Analysis] \`\`\` **Common screening factors:** | Category | Example Filters | |---|---| | Valuation | P/E < 15, P/B < 2.0, EV/EBITDA < 10 | | Quality | ROE > 15%, Debt/Equity < 0.5, interest coverage > 5x | | Growth | EPS growth > 10% 3yr CAGR, revenue growth > 8% | | Momentum | 12-month return > market, positive earnings revision | | Liquidity | Market cap > $1B, avg daily volume > $5M | **Key pitfalls:** 1. **Survivorship bias** -- Historical screens only show companies that survived; failed companies drop out 2. **Data-mining bias** -- Testing many filters will find patterns by chance 3. **Look-ahead bias** -- Using data that was not available at the screening date 4. **Turnover and costs** -- Screens that rebalance frequently incur high transaction costs 5. **Sector concentration** -- Value screens often overweight financials and utilities **Best practice:** Combine quantitative screening with qualitative judgment. A screen is a starting point, not an end point. The short list should be subjected to detailed analysis of competitive position, management quality, and catalysts before making investment decisions.

What is a stock screening methodology and how do professional analysts build screens?

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