Guarini Kathryn sold $340K of REGN
Guarini Kathryn sold 400 shares of REGENERON PHARMACEUTICALS, INC. (REGN) at $850.00 ($0.34M total) on 2026-09-02 under a Rule 10b5-1 trading plan.
How this was made
The 30-second read
Why it matters
The disclosed sale is a primary source event but modest in scale, offering limited trading edge.
Market read
Provides a fresh insider sale data point; limited impact on price expectations.
What to watch
Potential upcoming FDA decisions or trial results could outweigh the insider sale signal.
Background
SEC Form 4 filing discloses insider transactions; used by traders to gauge insider sentiment.
Ticker impact
Director Kathryn Guarini sold 400 shares of Regeneron at $850 each, total $340K, via a 10b5‑1 plan.
Potential short‑term dip of 0.5‑1% if market reacts.
A $340K sale by a director is a routine liquidity move; not large enough to drive major price action.
Market effects
Minimal impact on biotech sector; typical insider sales are common.
No regional effect; confined to Regeneron shareholders.
Negligible on global markets.
Counterpoint
If the director is cashing out ahead of upcoming negative news, the sale could foreshadow a drop.
Key entities
- CompanyRegeneron Pharmaceuticals, Inc.
Biotech firm developing therapeutics; ticker REGN.
- InsiderKathryn Guarini
Director of Regeneron, executed a 10b5‑1 sale.


