$REGN

Guarini Kathryn sold $320K of REGN

Guarini Kathryn sold 400 shares of REGENERON PHARMACEUTICALS, INC. (REGN) at $800.00 ($0.32M total) on 2026-08-10 under a Rule 10b5-1 trading plan.

Original reporting
SEC EDGAR · Guarini Kathryn
Published Aug 12, 2026, 8:16 PM UTC
Analysis
AlphAI AI DeskAI-generated
Added to AlphAI Aug 12, 2026, 8:22 PM UTC. Informational, not investment advice.
How this was made
AlphAI summarizes source reporting and applies a structured AI analysis for relevance, timing, sentiment and ticker impact. Always verify material claims with the original publisher.
AlphAI market briefInsider activity
Primary signal
$REGN
Neutral
medium confidence
Mentioned
$REGN
Relevance
3/10
AlphAI data visualization · based on SEC EDGAR
Decision brief

The 30-second read

$REGNNeutralLow
01

Why it matters

The only new fact is the reported open-market sale of 400 shares at $800/share on Aug. 10, with a 10b5-1 pre-arranged plan confirmed.

02

Market read

Traders may note insider selling, but the 10b5-1 structure and modest transaction size suggest limited incremental impact.

03

What to watch

The filing does not disclose reasons for the sale, and the post-transaction holdings (603 shares) are small relative to typical institutional float, limiting signal strength.

Relevance 3/10Novelty 3/10Timing: filed after-hours on Aug. 12, covering a sale dated Aug. 10

Background

The article is an SEC Form 4 insider transaction disclosure for Regeneron Pharmaceuticals, Inc.

Company-level read

Ticker impact

$REGNNeutralMedium confidence
Context

Regeneron director Kathryn Guarini sold 400 shares in an open-market transaction at $800/share under a 10b5-1 plan, filed Aug. 12.

Expected impact

Low likelihood of a sustained price move; any reaction is likely muted given the stated 10b5-1 pre-arranged plan.

Evidence & confidence

Form 4 reports the sale size and price ($320,000 total) and confirms a pre-arranged 10b5-1 plan, which typically reduces interpretive signal versus discretionary selling.

Market effects

Minimal. Insider transaction in a single biotech name does not materially reset sector expectations.

None indicated.

None indicated.

Counterpoint

Because the sale is under a 10b5-1 plan, it may reflect routine liquidity needs rather than bearish expectations, so any negative read-through may be overstated.

Key entities

  • REGN

    Regeneron Pharmaceuticals, Inc., the company whose director insider sale is disclosed.

  • Kathryn Guarini

    Director of Regeneron who sold 400 shares under a 10b5-1 plan.

Full insider trading history

This story covers one filing. See everything behind it: every insider buy and sell on record, 10b5-1 plans, late filings, and which officers and directors are trading.

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