Worth a closer look
- Open-market purchase with their own money (Form 4 code P), not a grant or option exercise.
- Raised their own holding by 14%.
- Their first purchase here in our data, after 1 sale.
- Similar past buys beat the S&P 500 52% of the time (268 cases), above the 46% for all buys.
- Their past buys: 3 of 3 beat the S&P 500 over 90 days.
Reasons for caution
- None found in the data.
What happened after this filing
Insider Twins: past buys with the same traits
1 insider buying · no CEO or CFO · $250K–$1M · stock down 20%+ in 3 months
ICHR Nov 17, 2025 +224.6% vs S&PKLXE Mar 11, 2020 +152.2% vs S&PCSPI Dec 15, 2023 +130.2% vs S&PAVTX Apr 24, 2023 -100.3% vs S&PCTNT Jun 17, 2026 -98.6% vs S&PRUBI Jun 16, 2026 -87.1% vs S&PWhat we couldn't check
- Why they traded. Filings don't say, and we don't guess.
- Company news after the filing, and any private terms.
David M Demski (a director) bought $409K of ATEC at about $6.81 on Oct 30, 2026, reported to the SEC on Nov 2, 2026. Buys like this beat the S&P 500 52% of the time since 2020, against 46% for all insider buys. We found 5 points that make it worth a closer look and 0 reasons for caution. History, not a prediction.
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Written by fixed rules from SEC filings and our measured history, not by an AI model. Public data only. History, not a prediction, and not investment advice.