Build a fundamental stock screen you can explain

Give each rule a clear job

Add one condition at a time and inspect what it removes. Keep a note of whether a company fails a rule, lacks the required data or is outside the selected market. Those cases have different meanings and should not collapse into a single negative label.

• Define the research question in one sentence.
• Select the relevant market and reporting window.
• Use a small set of understandable conditions.
• Inspect missing and inapplicable values separately.
• Read the filings of companies you investigate further.

Review the screen before trusting the shortlist

Try a slightly different threshold and see whether the result changes dramatically. A fragile shortlist may tell you more about a boundary choice than about the businesses. Check sector context before applying a ratio uniformly to very different industries.

Stock Screener includes ready-made filing-based screens, a custom screen builder, comparisons and sector information for US and Borsa Istanbul companies. Its data is a reported snapshot distributed with app updates, not a promise of current market pricing. Read the filing dates and open the source context when a result matters.

The SEC notes that financial statements work together. A screen based on one metric cannot replace the business description, notes, risk factors and management discussion that explain why the reported figures look as they do.