Rubrik (RBRK) Director John W. Thompson Sells Shares

What Happened
John W. Thompson, a director of Rubrik, reported multiple transactions on 2026-09-01. He sold a total of 13,500 shares in open-market transactions at prices ranging roughly from $87.97 to $92.38, generating about $1.20 million in proceeds. The filing also shows he exercised/converted 11,000 derivative securities (reported as fully vested), resulting in 11,000 shares being acquired/converted the same day per the Form 4 entries.

Key Details

• Transaction date: September 1, 2026; Form 4 filed September 3, 2026 (timely filing).
• Open-market sales: 13,500 shares sold across multiple transactions; weighted-average prices reported for groups of trades with per-share prices in the high $80s to low $90s. Aggregate proceeds ≈ $1,201,946.
• Derivative activity: 11,000 shares reported as exercised/converted (derivative codes M/C); some entries show $0 exercise price or N/A for price — see the filing for specifics. These derivative shares are noted as fully vested (footnote F11).
• Source of some shares: Certain shares are held of record by the John and Sandra Thompson Trust, for which he is co-trustee (footnote F3).
• Trading plan: At least some sales were effected under a Rule 10b5-1 trading plan adopted October 6, 2025 (footnote F1).
• Conversion clause: Footnote F12 explains Class B common shares automatically or optionally convert into Class A shares in certain circumstances.
• Shares owned after the transactions: not specified in the provided summary of the filing.

Context

• The filing combines cash-generating open-market sales with derivative exercise/conversion activity. The presence of a 10b5‑1 plan indicates some sales were pre-planned (routine disposition).
• For derivative transactions: "M" and "C" indicate exercise or conversion of derivative securities into common stock; the filing shows the derivative shares were fully vested. Where $0 or N/A is reported for price, review the Form 4 for the legal/technical detail of the conversion.
• This summary is factual and does not infer motive; purchases generally carry stronger signals than routine sales, and the 10b5‑1 disclosure suggests planned selling.