PETERS WILLIAM J sold $103K of AMPH

PETERS WILLIAM J (CFO, EVP & TREASURER) sold 4,139 shares of Amphastar Pharmaceuticals, Inc. (AMPH) at $25.00 ($0.10M total) on 2026-09-21 under a Rule 10b5-1 trading plan.

Original reporting
SEC EDGAR · PETERS WILLIAM J
Published Sep 23, 2026, 10:02 PM UTC
Analysis
AlphAI AI DeskAI-generated
Added to AlphAI Sep 23, 2026, 10:07 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
$AMPH
Neutral
high confidence
Mentioned
$AMPH
Relevance
3/10
AlphAI data visualization · based on SEC EDGAR
Decision brief

The 30-second read

$AMPHNeutralLow
01

Why it matters

The disclosed sale is modest and pre‑arranged, offering limited trading insight.

02

Market read

Minor insider sell; unlikely to move the stock materially.

03

What to watch

Potential upcoming FDA decisions or pipeline news not reflected in this filing.

Relevance 3/10Novelty 4/10Timing: post‑filing

Background

Form 4 filings disclose insider trades; CFOs often use 10b5‑1 plans to sell shares systematically.

Company-level read

Ticker impact

$AMPHNeutralHigh confidence
Context

CFO sold 4,139 shares for $103,475 via a 10b5-1 plan, reducing his stake to 168,707 shares.

Expected impact

Limited short-term impact; price likely unchanged.

Evidence & confidence

Sale amount is small relative to market cap and follows a pre‑arranged plan, reducing actionable significance.

Market effects

No broader sector impact; typical insider transaction.

None

None

Counterpoint

If CFO holds significant insider knowledge, even a small sale could hint at upcoming downside.

Key entities

  • Amphastar Pharmaceuticals, Inc.

    Biopharma company developing inhaled therapies.

  • William J. Peters

    Chief Financial Officer of Amphastar.

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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