SEC EDGARJUN 51 min read$AMPX

Stepien Thomas M sold $42K of AMPX

Stepien Thomas M (Chief Executive Officer) sold 2,000 shares of Amprius Technologies, Inc. (AMPX) at $20.97 on 2026-06-04.

Original reporting

SEC EDGAR · Stepien Thomas M

Published Jun 5, 2026, 8:57 PM UTC

Analysis

alphai AI DeskAI-generated

Added to alphai Jun 5, 2026, 9:04 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 Desk Scoring methodology Report an issue

alphai market briefInsider activity

Primary signal

$AMPX

Bearish

medium confidence

Mentioned

$AMPX

Relevance

6/10

alphai data visualization · based on SEC EDGAR

Decision brief

The 30-second read

$AMPXBearishLow

Why it matters

The disclosure provides a concrete datapoint on insider behavior but does not include new operating/financial information.

Market read

Traders may reassess short-term sentiment around AMPX based on insider selling, but the magnitude is likely not decisive alone.

What to watch

Check for clustering of insider transactions over the prior 1–3 months and whether other insiders/major holders are also trimming.

Relevance 6/10Novelty 7/10Timing: Filed June 5; transaction dated June 4 (post-market disclosure).

Background

This is an SEC Form 4 insider transaction disclosure for Amprius Technologies (AMPX).

Company-level read

Ticker impact

AI estimates · verify against primary disclosures

$AMPXBearishMedium confidence

Context

CEO Stepien Thomas M sold 2,000 shares of Amprius Technologies on June 4 for ~$41.9k via an open-market sale.

Expected impact

Likely limited near-term impact; watch for follow-on selling or broader news.

Evidence & confidence

The filing discloses a specific insider transaction price/size, but insider sales alone rarely drive large repricing without accompanying fundamentals.

Market effects

Sector

Minimal; this is company-specific insider activity with no stated sector catalyst.

Regional

None indicated.

Global

None indicated.

Counterpoint

What could challenge this read

A small open-market sale (and no stated 10b5-1 plan) can reflect diversification, taxes, or liquidity needs rather than bearish fundamentals.

Key entities

issuer
Amprius Technologies, Inc.
Subject of the Form 4 insider sale by its CEO.
insider
Stepien Thomas M
CEO and director who sold 2,000 shares on June 4.

Read at source ← All news

AUG 26

$AMPXMed

Amprius technologies director Kang Sun sells $642,186 in stock

Amprius Technologies director Kang Sun sold 62,101 shares for $642,186 to cover tax obligations. The stock is down 4.2% this week. Amprius reported Q2 revenue of $34.02M, beating estimates, and raised its full-year revenue guidance to at least $140M. The company has $74.5M in cash and no debt.

investing.com2 min

AUG 14

$RCATMed

Trump Drone Tariffs Boost US Makers, Companies Linked To His Family Rally

After the White House announced new tariffs on imported unmanned aircraft systems and components, drone makers and suppliers’ shares rose on Friday. Reported moves include Unusual Machines up as much as 28%, Red Cat Holdings up 15%, AeroVironment up about 10%, and Kratos up 6.9%. Tariffs take effect in 21 days, with some component duties delayed 180 days, according to the White House.

timesnownews.com4 min

AUG 10

$NMADMed

Washington Commits Another $2 Billion to Domestic Battery Supply

The US administration, according to a President Trump roundtable reported by Energy Metal News, committed over $2 billion to domestic battery and critical-mineral projects. The largest item is a $1.4 billion Defense Department loan to Sila Nanotechnologies, plus $400 million to Sunrise Energy Metals, $150 million to Niron Magnetics, and an $85.5 million equity investment in Strategic Bauxite. The article also highlights related company updates including NOMAD Power Solutions (NMAD).

leaderpost.com7 min

AUG 5

$AMPXMedAI 8/10

Why is Amprius Technologies stock surging today?

Amprius Technologies (AMPX) shares rose about 8.1% pre-open after the company reported Q2 2026 revenue of $34.0M, up 126% year over year, beating expectations. Amprius raised full-year 2026 revenue guidance to at least $140.0M, while targeting net loss under $10.0M and non-GAAP Adjusted EBITDA of at least $4.0M. GAAP EPS missed due to a warrant modification impact.

investing.com3 min

AUG 4

$AMPXHigh

Amprius Technologies, Inc. (AMPX): Results of Operations and Financial Condition

Amprius Technologies, Inc. (AMPX) filed an SEC Form 8-K — Results of Operations and Financial Condition. Exhibit 99.1 Amprius Technologies Reports Second Quarter 2026 Financial Results and Recent Business Highlights • Q2 2026 revenue more than doubled year-over-year to $34.0 million. • Net loss of $5.1 million, representing a 20% year-over-year improvement, including a $1.9 million

SEC EDGAR 8-K6 min

MAY 26