Kathryn Guarini - SEC Form 4 Insider Trading Activity
Director
Summary
Updated Aug 16, 2026
Kathryn Guarini has filed 1 SEC Form 4 filing across 1 company in the last 90 days - selling. Lifetime open-market sales: $320K.
Profile
Kathryn Guarini serves as Director of REGENERON PHARMACEUTICALS, INC. (REGN). Guarini has reported 1 insider filing with the SEC since 2026. The most recent filing was in August 2026.
- Role
- Director
Board memberships
- REGENERON PHARMACEUTICALS, INC.
Trading Pattern
InsiderAlpha's records for Kathryn Guarini go back to 2026: 1 primary Form 4 filing, an average of 1.0 per year. 3 recorded transactions carry a Rule 10b5-1 flag, meaning they were pre-scheduled under a written trading plan rather than discretionary.
Career & Filing History
Every role Kathryn Guarini has reported on a Form 4, reconstructed from the filings themselves. Reporting insiders must state their relationship to the issuer (officer title, director seat, or 10% ownership) on every filing.
- Director at REGENERON PHARMACEUTICALS, INC. (REGN) - 1 filing, 2026
Recent Transactions
2Companies - Last 90 Days
1- REGENERON PHARMACEUTICALS, INC. (REGN) - 1 filing, last 2026-08-12
Other Insiders Active in the Same Stocks
Insiders who reported open-market trades at the companies Kathryn Guarini has recently filed at. Multiple unrelated insiders buying the same stock within a short window - cluster buying - has historically been one of the strongest Form 4 signals.
- Christine A. Poon - $4.25M of REGN open-market activity in the last 12 months
- Huda Y. Zoghbi - $1.92M of REGN open-market activity in the last 12 months
- Jason Pitofsky - $1.87M of REGN open-market activity in the last 12 months
- Bonnie L. Bassler - $570K of REGN open-market activity in the last 12 months
- Arthur F. Ryan - $435K of REGN 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 Kathryn Guarini?
Kathryn Guarini serves as Director of REGENERON PHARMACEUTICALS, INC. (REGN). Guarini has reported 1 insider filing with the SEC since 2026. The most recent filing was in August 2026.…
How many SEC Form 4 filings has Kathryn Guarini submitted recently?
1 primary Form 4 filing in the last 90 days, covering 1 company.
Has Kathryn Guarini been buying or selling stock?
Recorded transactions: 0 open-market purchases and 1 open-market sale ($320K) across all tracked filings.
Where can I see all of Kathryn Guarini'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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