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SEC EDGARAUG 201 min read$MGNX

Peters Jeffrey Stuart sold $129K of MGNX

Peters Jeffrey Stuart (Senior VP, GC, and Secretary) sold 31,105 shares of MACROGENICS INC (MGNX) at $4.15 ($0.13M total) on 2026-08-19 under a Rule 10b5-1 trading plan.

Original reporting
SEC EDGAR · Peters Jeffrey Stuart
Published Aug 20, 2026, 10:19 PM UTC
Analysis
alphai AI DeskAI-generated
Added to alphai Aug 20, 2026, 10:20 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.
About alphai AI DeskScoring methodologyReport an issue
alphai market briefInsider activity
Primary signal
$MGNX
Bearish
medium confidence
Mentioned
$MGNX
Relevance
3/10
alphai data visualization · based on SEC EDGAR
Decision brief

The 30-second read

$MGNXBearishLow
01

Why it matters

A small insider divestiture by a senior officer may cause slight short‑term price weakness but is unlikely to drive major moves.

02

Market read

Primary disclosure of a modest insider sale; limited trading relevance.

03

What to watch

The 10b5‑1 plan may have been pre‑scheduled, limiting informational value.

Relevance 3/10Novelty 4/10Timing: filed after market close on 2026-08-20

Background

Form 4 filings disclose insider transactions; this is the first public report of the sale.

Company-level read

Ticker impact

$MGNXBearishMedium confidence
Context

Senior VP Jeffrey Stuart sold 31,105 shares for $129,085 via a 10b5‑1 plan, reducing his holding to zero.

Expected impact

Potential modest downside pressure in the next trading session.

Evidence & confidence

Insider sales, especially by a senior officer, often lead to slight sell‑offs, but the amount is small relative to market cap.

Market effects

Sector

Minimal impact on biotech sector; typical insider sale activity.

Regional

None

Global

None

Counterpoint

What could challenge this read

The sale could be routine estate planning, not a negative signal.

Key entities

  • Company
    MacroGenics Inc.

    Biotech firm listed on NASDAQ under ticker MGNX.

  • Individual
    Jeffrey Stuart

    Senior Vice President, General Counsel and Secretary of MacroGenics.

Read at source← All news

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.

MGNX insider trading history →

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