Summary
Updated Aug 31, 2026
Greg L. Armstrong is Director of PLAINS GP HOLDINGS LP (PAGP). 2 SEC Form 4 filings on record, most recently on 11 August 2025.
Recent Transactions
2Every recent SEC Form 4 transaction Greg L. Armstrong 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 Greg L. Armstrong 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.
- Joseph W. Rovig - $3.05M of NOV open-market activity in the last 12 months
- Craig L. Weinstock - $1.41M of NOV open-market activity in the last 12 months
- Christian S. Kendall - $1.01M of NOV open-market activity in the last 12 months
- David D. Harrison - $184K of NOV 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 Greg L. Armstrong?
Greg L. Armstrong is a corporate insider, tracked as Director of PLAINS GP HOLDINGS LP (PAGP). InsiderAlpha holds 2 primary Form 4 filings for them, the earliest from 2025, updated as new SEC EDGAR filings are processed.
When did Greg L. Armstrong last file a Form 4?
The most recent primary Form 4 on record is dated 11 August 2025, one of 2 filings going back to 2025.
Where can I see all of Greg L. Armstrong'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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