Rubrik Director John Thompson Files Form 144 to Sell $620K in Stock

Executive Summary

On November 2, 2026, John Wendell Thompson, a Director at Rubrik, Inc. ($RBRK), filed a Form 144 notice of proposed sale covering 5,000 shares of Common Stock through the John and Sandra Thompson Trust. The proposed transaction carries an estimated market value of $620,750, based on an implied price of approximately $124.15 per share.

Transaction Details

• Security: Common Stock
• Shares to be Sold: 5,000
• Aggregate Market Value: $620,750.00
• Approximate Sale Date: November 2, 2026
• Broker: Morgan Stanley Smith Barney LLC
• Acquisition Origin: Acquired directly from the issuer on February 26, 2014, in a private transaction.
• Pre-set Trading Plan: The transaction is executed pursuant to a Rule 10b5-1 trading plan adopted on October 6, 2025.

Historical Context & Trading Significance

The filing reflects regular, scheduled dispositions over the preceding three months by John Thompson and the John and Sandra Thompson Trust:

• October 1, 2026: Combined sale of 13,500 shares ($1,561,793.10)
• September 1, 2026: Combined sale of 13,500 shares ($1,201,943.85)
• August 3, 2026: Combined sale of 13,500 shares ($1,000,384.95)

Given that the 5,000 shares represent less than 0.003% of Rubrik's 167,367,143 shares outstanding and were executed under a pre-established 10b5-1 plan established more than a year prior, this filing carries Low trading significance and represents routine insider liquidity.