Summary
Updated Aug 30, 2026
Donald W. Slager is Director of MARTIN MARIETTA MATERIALS INC (MLM). 8 SEC Form 4 filings on record going back to 2024, most recently on 18 May 2026.
Recent Transactions
4Every recent SEC Form 4 transaction Donald W. Slager has reported, most recent first.
Other Insiders Active in the Same Stocks
Insiders who reported open-market trades in the last 12 months at the companies Donald W. Slager 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.
- Adrian James Holt - $366K of EMN 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 Donald W. Slager?
Donald W. Slager is a corporate insider, tracked as Director of MARTIN MARIETTA MATERIALS INC (MLM). InsiderAlpha holds 8 primary Form 4 filings for them, the earliest from 2024, updated as new SEC EDGAR filings are processed.
When did Donald W. Slager last file a Form 4?
The most recent primary Form 4 on record is dated 18 May 2026, one of 8 filings going back to 2024.
Where can I see all of Donald W. Slager'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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