Summary
Updated Aug 31, 2026
Jason Armstrong is CFO of COMCAST CORP (CMCSA). 6 SEC Form 4 filings on record going back to 2024, most recently on 6 March 2026. Most recent open-market trade: sold $143K of CMCSA on 6 March 2026. Lifetime open-market sales: $1.19M.
Recent Transactions
17Every recent SEC Form 4 transaction Jason Armstrong has reported, most recent first.
Trading Pattern
InsiderAlpha's records for Jason Armstrong go back to 2024: 6 primary Form 4 filings, an average of 2.0 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 Jason 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.
- Michael J. Cavanagh - $1.89M of CMCSA open-market activity in the last 12 months
- Asuka Nakahara - $246K of CMCSA 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 Jason Armstrong?
Jason Armstrong is a corporate insider, tracked as CFO of COMCAST CORP (CMCSA). InsiderAlpha holds 6 primary Form 4 filings for them, the earliest from 2024, updated as new SEC EDGAR filings are processed.
When did Jason Armstrong last file a Form 4?
The most recent primary Form 4 on record is dated 6 March 2026, one of 6 filings going back to 2024.
Has Jason Armstrong been buying or selling stock?
Recorded transactions: 0 open-market purchases and 3 open-market sales ($1.19M) across all tracked filings.
Where can I see all of Jason 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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