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ATER SCHEDULE 13D: Activist campaign

A Schedule 13D was

Filed with the SEC on · accession 0001829126-26-010004

ATER filed a SCHEDULE 13D (schedule 13d) with the SEC on Sep 10, 2026. A Schedule 13D was filed on 2026-09-10 regarding Aterian, Inc. (ATER), indicating a new or amended active ownership position by a reporting person. The stock moved +20.7% by the first close after the filing.

Summary of the filing

A Schedule 13D was filed on 2026-09-10 regarding Aterian, Inc. (ATER), indicating a new or amended active ownership position by a reporting person. The filing text available does not disclose the holder's identity, ownership percentage, or stated intentions.

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Key details

Subject companyAterian, Inc.

How ATER stock reacted

Close before

$0.71

Sep 9, 2026

First close after

+20.70%

$0.86

5 trading days

-3.13%

$0.69

Since filing

+20.08%

$0.85

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Frequently asked questions

What did ATER file with the SEC on Sep 10, 2026?

ATER filed a SCHEDULE 13D (Activist campaign). A Schedule 13D was filed on 2026-09-10 regarding Aterian, Inc. (ATER), indicating a new or amended active ownership position by a reporting person. The filing text available does not disclose the holder's identity, ownership percentage, or stated intentions.

What does a activist campaign mean for ATER stock?

A settlement removes uncertainty; the stock often reacts to whether the amount is bigger or smaller than investors expected.

How do I read a SCHEDULE 13D?

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 13D (schedule 13d): A report the company filed with the SEC (the US market regulator).

How did ATER stock react to this filing?

ATER closed at $0.71 before the filing and $0.86 on Sep 10, 2026 (+20.70%). Five trading days later: $0.69 (-3.13%).

Other ATER SEC filings

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