Summary
Updated Aug 31, 2026
Mark W. Westphal is PRES., FOODSERVICE of Post Holdings, Inc. (POST). 8 SEC Form 4 filings on record going back to 2024, most recently on 20 November 2025.
Recent Transactions
17Every recent SEC Form 4 transaction Mark W. Westphal has reported, most recent first.
Trading Pattern
InsiderAlpha's records for Mark W. Westphal go back to 2024: 8 primary Form 4 filings, an average of 2.7 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 Mark W. Westphal 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.
- Gregory L. Curl - $1.45M of POST open-market activity in the last 12 months
- Nicolas Catoggio - $1.00M of POST open-market activity in the last 12 months
- David W. Kemper - $176K of POST 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 Mark W. Westphal?
Mark W. Westphal is a corporate insider, tracked as PRES., FOODSERVICE of Post Holdings, Inc. (POST). InsiderAlpha holds 8 primary Form 4 filings for them, the earliest from 2024, updated as new SEC EDGAR filings are processed.
When did Mark W. Westphal last file a Form 4?
The most recent primary Form 4 on record is dated 20 November 2025, one of 8 filings going back to 2024.
Where can I see all of Mark W. Westphal'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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