Brosius Mark 4

What Happened
Mark Brosius, SVP & Chief Manufacturing and Supply Chain Officer at Intuitive Surgical (ISRG), had equity awards vest/convert on Feb 26, 2026. The filing shows derivative awards and conversions (RSUs/PSUs) resulting in the acquisition of vested units (10,316 units reported as acquired across grant/conversion lines). To satisfy tax withholding, 1,288 shares were surrendered/sold (codes F) at $506.17 per share, producing proceeds of $651,947 (two withholding transactions: 805 shares = $407,467; 483 shares = $244,480). These were routine withholding/disposition actions tied to vesting, not an open-market sale for investment purposes.

Key Details

• Transaction date: Feb 26, 2026; Form 4 filed Feb 27, 2026 (appears timely).
• Withholding/sales: 805 shares @ $506.17 = $407,467; 483 shares @ $506.17 = $244,480; total $651,947.
• Vesting/conversion: multiple derivative entries (codes A and M) totaling 10,316 units recorded as acquired (RSUs/PSUs converting to common stock).
• Shares owned after transaction: not specified in the supplied filing data.
• Footnotes: F1/F3—RSUs vest 25% annually over 4 years; portions are held back to cover statutory tax withholding. F2—PSUs granted 2/28/2023 met performance criteria and vested (subject to continuous service).
• Transaction codes: M = exercise/conversion of derivative; A = grant/award; F = payment of exercise price or tax liability (share withholding/sale).

Context
This is a standard vesting event: RSUs/PSUs converted into common shares and the company/administrator withheld/sold a portion to cover taxes (cashless/withholding settlement). Such withholding transactions are routine and do not necessarily indicate a change in the insider’s view of the company—unlike open-market purchases, they are administrative settlements tied to compensation.