Summary
Updated Aug 30, 2026
Machiel Duijser is EVP & CSCO of ECOLAB INC. (ECL). 1 SEC Form 4 filing on record, dated 6 December 2024.
Trading Pattern
InsiderAlpha's records for Machiel Duijser go back to 2024: 1 primary Form 4 filing, an average of 0.3 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 Stocks
Insiders who reported open-market trades in the last 12 months at the companies Machiel Duijser 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.
- Christophe Beck - $16.83M of ECL open-market activity in the last 12 months
- Nicholas J. Alfano - $2.88M of ECL open-market activity in the last 12 months
- Darrell R. Brown - $2.61M of ECL open-market activity in the last 12 months
- Gregory B. Cook - $2.37M of ECL open-market activity in the last 12 months
- Michel D. Doukeris - $2.00M of ECL open-market activity in the last 12 months
- Scott D. Kirkland - $930K of ECL 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 Machiel Duijser?
Machiel Duijser is a corporate insider, tracked as EVP & CSCO of ECOLAB INC. (ECL). InsiderAlpha holds 1 primary Form 4 filing for them, the earliest from 2024, updated as new SEC EDGAR filings are processed.
When did Machiel Duijser last file a Form 4?
The only primary Form 4 on record is dated 6 December 2024.
Where can I see all of Machiel Duijser'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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