RBRK SCHEDULE 13G/A: SEC filing

An institutional holder

Filed with the SEC on Oct 30, 2026 · accession 0002100119-26-001667

RBRK filed a SCHEDULE 13G/A (schedule 13g/a) with the SEC on Oct 30, 2026. An institutional holder filed an amended Schedule 13G for Rubrik, Inc. (RBRK), indicating a change in passive ownership position. The stock moved -7.1% by the first close after the filing.

Summary of the filing

An institutional holder filed an amended Schedule 13G for Rubrik, Inc. (RBRK), indicating a change in passive ownership position. The filing does not disclose a specific activist intent.

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Key details

IssuerRubrik, Inc.

How RBRK stock reacted

Close before

$133.63

Oct 29, 2026

First close after

-7.09%

$124.15

5 trading days

-20.87%

$105.74

Since filing

-20.86%

$105.75

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Frequently asked questions

What did RBRK file with the SEC on Oct 30, 2026?

RBRK filed a SCHEDULE 13G/A (SEC filing). An institutional holder filed an amended Schedule 13G for Rubrik, Inc. (RBRK), indicating a change in passive ownership position. The filing does not disclose a specific activist intent.

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 RBRK stock react to this filing?

RBRK closed at $133.63 before the filing and $124.15 on Oct 30, 2026 (-7.09%). Five trading days later: $105.74 (-20.87%).

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