Vanguard Portfolio Management Trims Rubrik Stake Below 5%

Executive Summary

On October 30, 2026, Vanguard Portfolio Management LLC filed an amended Schedule 13G (Amendment No. 1) with the SEC regarding its ownership in Rubrik Inc (RBRK). The filing reflects ownership positions as of September 30, 2026, confirming that Vanguard's beneficial ownership in Rubrik Inc has dropped below the 5% regulatory reporting threshold to 4.79%.

Key Filing Details

• Issuer: Rubrik Inc (CIK: 0001943896)
• Reporting Person: Vanguard Portfolio Management LLC (CIK: 0002100121)
• Class of Security: Common Stock (CUSIP: 781154109)
• Event Date: September 30, 2026
• Shares Beneficially Owned: 8,019,927 shares
• Percent of Class: 4.79%

Voting and Dispositive Authority

• Sole Voting Power: 32,850 shares
• Shared Voting Power: 0 shares
• Sole Dispositive Power: 8,019,927 shares
• Shared Dispositive Power: 0 shares

Regulatory and Ownership Context

• Item 5 Certification: Under Item 5 of Schedule 13G, the filer indicated that it has ceased to be the beneficial owner of more than 5 percent of the class of securities.
• Investment Intent: Filed under Rule 13d-1(b) as an investment adviser holding securities in the ordinary course of business without activist intent or purpose to change or influence control of the issuer.