$AMPX

Stepien Thomas M sold $75K of AMPX

Stepien Thomas M (Chief Executive Officer) sold 4,375 shares of Amprius Technologies, Inc. (AMPX) at $17.19 on 2026-05-27.

Original reporting
SEC EDGAR · Stepien Thomas M
Published May 28, 2026, 4:00 PM UTC
Analysis
AlphAI AI DeskAI-generated
Added to AlphAI Aug 6, 2026, 8:48 AM 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
$AMPX
Neutral
medium confidence
Mentioned
$AMPX
Relevance
3/10
AlphAI data visualization · based on SEC EDGAR
Decision brief

The 30-second read

$AMPXNeutralLow
01

Why it matters

The newest fact is the CEO’s open-market sale details (shares, price, total value, and post-transaction holdings). This can influence short-term sentiment but does not provide new operational or financial guidance.

02

Market read

Traders may note the insider sale as a minor sentiment input, but there is no fundamental catalyst in the text to drive a durable repricing.

03

What to watch

The article does not state whether the sale was part of a 10b5-1 plan (it says no), nor does it provide context on total holdings, compensation, or future planned sales.

Relevance 3/10Novelty 5/10Timing: Form 4 filed 2026-05-28, covering sale dated 2026-05-27.

Background

The article is an SEC Form 4 insider transaction disclosure for Amprius Technologies, Inc. (AMPX).

Company-level read

Ticker impact

$AMPXNeutralMedium confidence
Context

Amprius Technologies CEO Stepien sold 4,375 shares in an open-market transaction at $17.1935 on 2026-05-27, per Form 4 filed 2026-05-28.

Expected impact

Low likelihood of a sustained price move solely from this Form 4; any impact is likely short-lived.

Evidence & confidence

The filing is a primary-source Form 4, but it is an open-market sale with no 10b5-1 plan stated and no accompanying fundamental catalyst in the text.

Market effects

No sector-wide implications are disclosed; this is company-specific insider transaction data.

None indicated.

None indicated.

Counterpoint

Insider sales can be driven by diversification, taxes, or pre-planned liquidity needs, so the signal may be overstated.

Key entities

  • Amprius Technologies, Inc.

    Subject of the Form 4 insider sale disclosure (AMPX).

  • Stepien Thomas M

    CEO and officer/director who sold shares via open-market sale.

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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