Rubrik CTO Arvind Nithrakashyap Sells $3.5M in Stock Under Rule 10b5-1 Plan

Executive Insider Transaction Summary

Insider Name: Arvind Nithrakashyap
Title/Relationship: Chief Technology Officer & Director
Issuer: Rubrik, Inc. (NYSE: RBRK)
Filing Date: October 7, 2026

Key Findings

• Transaction Overview: Between October 5 and October 7, 2026, CTO Arvind Nithrakashyap converted 28,141 shares of Class B Common Stock to Class A Common Stock and subsequently sold all 28,141 Class A shares in multiple open-market tranches.
• Aggregate Proceeds: The aggregate sale generated approximately $3,511,394 with weighted average prices ranging from $118.92 to $127.70 per share.
• Trading Plan: All sales were executed pursuant to a pre-arranged Rule 10b5-1 trading plan adopted on October 15, 2025.
• Post-Transaction Holdings: Following these transactions, the reporting owner directly holds 272,538 shares of Class A Common Stock and 10,000,109 shares of Class B Common Stock, alongside 200,000 Class B shares held indirectly via the Nithrakashyap/Chatterjee Revocable Trust. The sold shares represent a negligible fraction (<0.3%) of his overall equity position in the company.