Screening and Scanner Tools

Screening and scanner tools covers stock scanners, stock screeners, and screening tools used to filter market data.

Use this branch when the question is about how a tool selects, filters, or updates securities. This content is educational and does not endorse any screen result or security.

What This Branch Covers

Decision Lens

Screeners and scanners are discovery tools. Their output depends on the universe, filters, data refresh, missing-data treatment, and vendor definitions; results need independent verification before being used as finance evidence.

Move to Market Data, Tickers, and Tapes when the issue is the underlying data. Move to Listings and Securities when the issue is whether a security is listed, restricted, or correctly identified.

Evaluation Checklist

• Identify the screen universe, criteria, data vendor, update frequency, and timestamp.
• Check whether the tool uses live, delayed, adjusted, or derived data.
• Confirm ticker, exchange, security identifier, and liquidity before relying on a result.
• Review how missing values, suspended securities, and corporate actions are handled.
• Treat results as leads for research, not final evidence.

Common Mistakes

• Treating a screen as a recommendation.
• Comparing screeners with different universes or data vendors.
• Ignoring stale or delayed scanner data.
• Overlooking low liquidity after a stock passes a filter.
• Forgetting that filter definitions can differ across tools.

For broader context, return to Market Data, Tickers, and Screening Tools.

In this section

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