Summary
Updated Aug 31, 2026
Spencer R. Berthelsen is Director of IONIS PHARMACEUTICALS INC (IONS). 6 SEC Form 4 filings on record going back to 2025, most recently on 17 July 2026. Most recent open-market trade: sold $588K of IONS on 16 June 2026. Lifetime open-market sales: $1.19M.
Recent Transactions
6Every recent SEC Form 4 transaction Spencer R. Berthelsen has reported, most recent first.
Trading Pattern
InsiderAlpha's records for Spencer R. Berthelsen go back to 2025: 6 primary Form 4 filings, an average of 3.0 per year. 6 recorded transactions carry a Rule 10b5-1 flag, meaning they were pre-scheduled under a written trading plan rather than discretionary.
Other Insiders Active in the Same Stocks
Insiders who reported open-market trades in the last 12 months at the companies Spencer R. Berthelsen 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.
- Brett P. Monia - $42.65M of IONS open-market activity in the last 12 months
- Elizabeth L. Hougen - $21.12M of IONS open-market activity in the last 12 months
- C. Frank Bennett - $19.36M of IONS open-market activity in the last 12 months
- Patrick R. O'Neil - $16.03M of IONS open-market activity in the last 12 months
- Richard S. Geary - $13.73M of IONS open-market activity in the last 12 months
- Joseph Loscalzo - $8.05M of IONS 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 Spencer R. Berthelsen?
Spencer R. Berthelsen is a corporate insider, tracked as Director of IONIS PHARMACEUTICALS INC (IONS). InsiderAlpha holds 6 primary Form 4 filings for them, the earliest from 2025, updated as new SEC EDGAR filings are processed.
How many SEC Form 4 filings has Spencer R. Berthelsen submitted recently?
4 primary Form 4 filings in the last 90 days, covering 1 company.
Has Spencer R. Berthelsen been buying or selling stock?
Recorded transactions: 0 open-market purchases and 2 open-market sales ($1.19M) across all tracked filings.
Where can I see all of Spencer R. Berthelsen'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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