Summary
Updated Aug 31, 2026
John C. Plant is Director of MASCO CORP /DE/ (MAS). 6 SEC Form 4 filings on record going back to 2025, most recently on 12 May 2026. Most recent open-market trade: sold $23.54M of HWM on 12 May 2025. Lifetime open-market sales: $125.57M.
Recent Transactions
7Every recent SEC Form 4 transaction John C. Plant has reported, most recent first.
Trading Pattern
InsiderAlpha's records for John C. Plant go back to 2025: 6 primary Form 4 filings, an average of 3.0 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 John C. Plant 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.
- Mark T. Mondello - $35.08M of JBL open-market activity in the last 12 months
- Neil Edward Marchuk - $22.66M of HWM open-market activity in the last 12 months
- Michael Dastoor - $6.42M of JBL open-market activity in the last 12 months
- Steven D. Borges - $5.72M of JBL open-market activity in the last 12 months
- Kenneth G. Cole - $4.00M of MAS open-market activity in the last 12 months
- May Yee Yap - $2.49M of JBL 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 John C. Plant?
John C. Plant is a corporate insider, tracked as Director of MASCO CORP /DE/ (MAS). InsiderAlpha holds 6 primary Form 4 filings for them, the earliest from 2025, updated as new SEC EDGAR filings are processed.
When did John C. Plant last file a Form 4?
The most recent primary Form 4 on record is dated 12 May 2026, one of 6 filings going back to 2025.
Has John C. Plant been buying or selling stock?
Recorded transactions: 0 open-market purchases and 2 open-market sales ($125.57M) across all tracked filings.
Where can I see all of John C. Plant'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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