Summary
Updated Aug 31, 2026
William M. Cook files SEC Form 4 reports at Mativ Holdings, Inc. (MATV). 7 SEC Form 4 filings on record going back to 2024, most recently on 7 July 2026. Most recent open-market trade: bought $29K of MATV on 2 June 2025. Lifetime open-market purchases: $60K.
Recent Transactions
3Every recent SEC Form 4 transaction William M. Cook has reported, most recent first.
Trading Pattern
InsiderAlpha's records for William M. Cook go back to 2024: 7 primary Form 4 filings, an average of 2.3 per year. The typical open-market purchase is $30K (2 buys totaling $60K). The largest single buy on record is $31K of MATV in 2024. 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 have reported open-market trades at the same companies as William M. Cook. Multiple unrelated insiders buying the same stock within a short window, cluster buying, has historically been one of the strongest Form 4 signals.
- Shruti Singhal - $230K of MATV open-market activity on record
- Kimberly E. Ritrievi - $59K of MATV open-market activity on record
- Marco Levi - $58K of MATV open-market activity on record
- John K. Stipancich - $32K of MATV open-market activity on record
More Notable Insiders
Other corporate insiders with significant SEC Form 4 track records on InsiderAlpha:
Frequently Asked Questions
Who is William M. Cook?
William M. Cook is a corporate insider of Mativ Holdings, Inc. (MATV). 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 William M. Cook submitted recently?
1 primary Form 4 filing in the last 90 days, covering 1 company.
Has William M. Cook been buying or selling stock?
Recorded transactions: 2 open-market purchases ($60K) and 0 open-market sales across all tracked filings.
Where can I see all of William M. Cook'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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