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RBRK SCHEDULE 13G/A: SEC filing

Lightspeed Venture Partners entities

Filed with the SEC on · accession 0001539061-26-000013

RBRK filed a SCHEDULE 13G/A (schedule 13g/a) with the SEC on Aug 14, 2026. Lightspeed Venture Partners entities filed a joint filing agreement as part of a Schedule 13G/A amendment regarding their beneficial ownership of Rubrik, Inc. Class A common stock. The stock moved -2.7% by the first close after the filing.

Summary of the filing

Lightspeed Venture Partners entities filed a joint filing agreement as part of a Schedule 13G/A amendment regarding their beneficial ownership of Rubrik, Inc. Class A common stock. The filing is an administrative exhibit and does not disclose any change in ownership position.

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Key details

Issuer of securities subject to the schedule 13g/aRubrik, Inc.
Reporting person / beneficial ownerLightspeed Venture Partners IX, L.P.
General partner of reporting personLightspeed General Partner IX, L.P.
General partner of general partnerLightspeed Ultimate General Partner IX, Ltd.
Reporting personLightspeed SPV I, LLC
Reporting personLightspeed SPV I-B, LLC
Reporting personLightspeed SPV I-C, LLC
General partner of spv entitiesLS SPV Management, LLC
Reporting personLightspeed Venture Partners Select II, L.P.
General partner of reporting personLightspeed General Partner Select II, L.P.
General partner of general partnerLightspeed Ultimate General Partner Select II, Ltd.
Director/managing member of lightspeed entitiesRavi Mhatre

How RBRK stock reacted

Close before

$105.09

Aug 13, 2026

First close after

-2.72%

$102.23

5 trading days

-7.20%

$97.52

Since filing

+0.63%

$105.75

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Frequently asked questions

What did RBRK file with the SEC on Aug 14, 2026?

RBRK filed a SCHEDULE 13G/A (SEC filing). Lightspeed Venture Partners entities filed a joint filing agreement as part of a Schedule 13G/A amendment regarding their beneficial ownership of Rubrik, Inc. Class A common stock. The filing is an administrative exhibit and does not disclose any change in ownership position.

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 $105.09 before the filing and $102.23 on Aug 14, 2026 (-2.72%). Five trading days later: $97.52 (-7.20%).

Other RBRK SEC filings

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