10 of 39 insider buys from the week of Jul 27 beat the S&P 500 over 90 days
Three things the SEC filings said this week, measured the same way every week and kept as a permanent record. Written by rules from our data, not by an AI model. History, not a prediction.
1 · The 90-day report card
Every open-market insider purchase filed Jul 27, 2026 to Aug 2, 2026, now with a full 90 days of results.
Best
The biggest buys that week: SCTX $36.3M (−17.2%), COE $17.9M (−36.8%), SCTX $15.0M (−18.8%), SCTX $15.0M (−18.8%), GSHD $9.1M (−33.9%).
2 · This week's buying
Filed Oct 21, 2026 to Oct 27, 2026.
3 · Question of the week
Are insider buys made in October any better?
Yes: 54% of buys bought in October beat the S&P 500 over 90 days, vs 45% every other month, and the gap points the same way in both halves of the data.
| Beat the S&P 500 over 90 days | bought in October | every other month |
|---|---|---|
| All years since 2020 | 54% (333 of 617) | 45% (7,403 of 16,282) |
| 2020 to March 2023 | 54% (150 of 280) | 47% (3,712 of 7,904) |
| April 2023 to now | 54% (183 of 337) | 44% (3,691 of 8,378) |
A pattern only counts here if it points the same way in both halves of the data. Median result and every case are in the Backtester. Survivorship caveat: delisted stocks often lack prices, which flatters these numbers a little.
What would you check next?
Every number above can be checked against the SEC filings. Disagree with a result, or want a question tested? Tell us and we'll run it in a future week.
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