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OII SCHEDULE 13G/A: SEC filing

Brown Advisory Inc.

Filed with the SEC on · accession 0001345929-26-000042

OII filed a SCHEDULE 13G/A (schedule 13g/a) with the SEC on Nov 13, 2026. Brown Advisory Inc. filed an amended Schedule 13G reporting beneficial ownership of 3,791,899 shares (3.81%) of Oceaneering International Inc. as of September 30, 2026, on behalf of its subsidiaries. The stock moved +2.4% by the first close after the filing.

Summary of the filing

Brown Advisory Inc. filed an amended Schedule 13G reporting beneficial ownership of 3,791,899 shares (3.81%) of Oceaneering International Inc. as of September 30, 2026, on behalf of its subsidiaries. The filing is a passive investment disclosure with no intent to influence control.

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Key details

Aggregate amount beneficially ownedshares 3.8M
Percent of class beneficially ownedpercent 4
Issuer of the securitiesOceaneering International Inc.
Filer / parent holding companyBrown Advisory Inc.
Subsidiary of filerBrown Investment Advisory & Trust Co
Subsidiary of filerBrown Advisory LLC
Subsidiary of filerSignature Financial Management, Inc.
Chief compliance officer, brown advisory inc.Victor Fernandez

How OII stock reacted

Close before

$34.78

Nov 12, 2026

First close after

+2.44%

$35.63

5 trading days

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Since filing

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Frequently asked questions

What did OII file with the SEC on Nov 13, 2026?

OII filed a SCHEDULE 13G/A (SEC filing). Brown Advisory Inc. filed an amended Schedule 13G reporting beneficial ownership of 3,791,899 shares (3.81%) of Oceaneering International Inc. as of September 30, 2026, on behalf of its subsidiaries. The filing is a passive investment disclosure with no intent to influence control.

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 OII stock react to this filing?

OII closed at $34.78 before the filing and $35.63 on Nov 13, 2026 (+2.44%).

Other OII SEC filings

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