Summary
Updated Aug 31, 2026
Dennis E. Marshall is Director of BIOLARGO, INC. (BLGO). 7 SEC Form 4 filings on record going back to 2024, most recently on 2 July 2026.
Trading Pattern
InsiderAlpha's records for Dennis E. Marshall go back to 2024: 7 primary Form 4 filings, an average of 2.3 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 Sector
No other insider has filed at Dennis E. Marshall's companies, so these are insiders reporting open-market trades at other companies in the same sector.
- Peter A. Leidel - $25.41M of METC open-market activity in the last 12 months
- Neil Edward Marchuk - $22.66M of HWM open-market activity in the last 12 months
- Walter J. Scheller - $22.20M of HCC open-market activity in the last 12 months
- Leon J. Topalian - $21.48M of NUE open-market activity in the last 12 months
- Robert S. Wetherbee - $21.21M of ATI open-market activity in the last 12 months
- Mitchell R. Butier - $20.02M of AVY 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 Dennis E. Marshall?
Dennis E. Marshall is a corporate insider, tracked as Director of BIOLARGO, INC. (BLGO). InsiderAlpha holds 7 primary Form 4 filings for them, the earliest from 2024, updated as new SEC EDGAR filings are processed.
How many SEC Form 4 filings has Dennis E. Marshall submitted recently?
2 primary Form 4 filings in the last 90 days, covering 1 company.
Where can I see all of Dennis E. Marshall'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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