Material Weakness Index: Q3 2026

Corrected Oct 25, 2026: the Q3 count is now 869 companies, from a full re-read of every filing, and every share below is recomputed on that count. The earlier figure, 581, came from early automatic tags.

869 public companies that file with the SEC stated a material weakness, or concluded that internal control over financial reporting wasn’t effective, in a 10-K or 10-Q filed July to September 2026. 271 of them concluded that internal control over financial reporting wasn't effective. This is what keeps breaking, and why so many of the same weaknesses come back.

Causes come from an automatic reading of each filing. Verified cause codes, each linked to the sentence it rests on, follow later this year.

What's inside

• Every root cause, ranked, with what I see behind the top ones
• Control Drift: the pattern behind weaknesses that come back
• Who disclosed, by industry, and some names you'll know
• Four questions to ask before your auditor does

Five pages, free PDF.

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Source: SEC EDGAR full-text search of 10-K and 10-Q filings dated July 1 to September 30, 2026. Based on public filings; not investment advice.