SEPTInvestingStart Free

AMPX SCHEDULE 13G/A: SEC filing

An institutional holder

Filed with the SEC on · accession 0001595888-26-000085

AMPX filed a SCHEDULE 13G/A (schedule 13g/a) with the SEC on Aug 10, 2026. An institutional holder filed an amended Schedule 13G for Amprius Technologies, indicating a change in passive ownership position. The stock moved -0.3% by the first close after the filing.

Summary of the filing

An institutional holder filed an amended Schedule 13G for Amprius Technologies, indicating a change in passive ownership position. The filing text does not disclose specific ownership percentages or share counts.

For details, click here →

Key details

IssuerAmprius Technologies, Inc.

How AMPX stock reacted

Close before

$11.85

Aug 7, 2026

First close after

-0.34%

$11.81

5 trading days

+5.57%

$12.51

Since filing

-26.41%

$8.72

✦ Ask GOAX AI about this filing — what it means for AMPX, what changed since its last filings and what to watch next.

Try it free for 7 days

🔔 Want to stay updated on new SEC filings for AMPX?

Click here

Frequently asked questions

What did AMPX file with the SEC on Aug 10, 2026?

AMPX filed a SCHEDULE 13G/A (SEC filing). An institutional holder filed an amended Schedule 13G for Amprius Technologies, indicating a change in passive ownership position. The filing text does not disclose specific ownership percentages or share counts.

How do I read a SCHEDULE 13G/A?

A report the company filed with the SEC (the US market regulator). Start with the summary, then the key amounts and names. Compare it with the company’s earlier filings.

Why are SEC filings important?

Public companies must tell the SEC about anything that can change their value — results, leadership changes, big deals, new shares, bankruptcy. Filings are the official source, often before the news. A SCHEDULE 13G/A (schedule 13g/a): A report the company filed with the SEC (the US market regulator).

How did AMPX stock react to this filing?

AMPX closed at $11.85 before the filing and $11.81 on Aug 10, 2026 (-0.34%). Five trading days later: $12.51 (+5.57%).

Other AMPX SEC filings

Get alerts when AMPX files with the SEC, plus live charts, key levels and news for 13,000+ stocks.

Try SEPT free for 7 days
AMPX overviewAMPX analysisAMPX newsLatest SEC filings