Summary
Updated Aug 30, 2026
Larry Douglas Altstiel is Chief Medical Officer of ProMIS Neurosciences Inc. (PMN). 2 SEC Form 4 filings on record going back to 2024, most recently on 22 September 2025.
Trading Pattern
InsiderAlpha's records for Larry Douglas Altstiel go back to 2024: 2 primary Form 4 filings, an average of 0.7 per year. No transaction on record carries a Rule 10b5-1 flag - the filings look discretionary rather than pre-scheduled, which makes their timing more informative as a signal.
Other Insiders Active in the Same Stocks
Insiders who reported open-market trades in the last 12 months at the companies Larry Douglas Altstiel files at. Multiple unrelated insiders buying the same stock within a short window, cluster buying, has historically been one of the strongest Form 4 signals.
- ABG Management Ltd. - $8.50M of PMN open-market activity in the last 12 months
- Eugene Williams - $141K of PMN open-market activity in the last 12 months
- Johanne Kaplan - $55K of PMN open-market activity in the last 12 months
- Patrick D. Kirwin - $45K of PMN open-market activity in the last 12 months
- Max A. Milbury - $15K of PMN open-market activity in the last 12 months
- Jeremy M. Sclar 2012 Irrevocable Family Trust - of PMN open-market activity in the last 12 months
More Notable Insiders
Other corporate insiders with significant SEC Form 4 track records on InsiderAlpha:
Frequently Asked Questions
Who is Larry Douglas Altstiel?
Larry Douglas Altstiel is a corporate insider, tracked as Chief Medical Officer of ProMIS Neurosciences Inc. (PMN). InsiderAlpha holds 2 primary Form 4 filings for them, the earliest from 2024, updated as new SEC EDGAR filings are processed.
When did Larry Douglas Altstiel last file a Form 4?
The most recent primary Form 4 on record is dated 22 September 2025, one of 2 filings going back to 2024.
Where can I see all of Larry Douglas Altstiel's SEC filings?
All Form 4 filings, transaction values, and 10b5-1 plan flags are listed on this page and updated in real time as new SEC EDGAR filings are processed.
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