Burns Thomas William 4

What Happened

• Thomas W. Burns, Chairman and CEO of Glaukos Corp. (GKOS), had 4,059 shares withheld by the company to satisfy tax withholding obligations related to the vesting and delivery of previously granted restricted stock units (RSUs). The withholding was reported as a disposition at an effective price of $142.57 per share, for a total value of approximately $578,692.
• This transaction was a tax-withholding action (transaction code F), not an open‑market sale — the company retained shares to pay taxes due on RSU vesting.

Key Details

• Transaction date: 2026-06-25; Filing date: 2026-06-29 (filed within the SEC’s 2-business-day Form 4 window).
• Withheld shares: 4,059 at $142.57 each — total value ~$578,692.
• Transaction type: F (shares withheld by issuer to satisfy tax withholding upon RSU vesting).
• Footnote F1: Withholding relates to RSUs granted on March 18, 2021; shares were withheld upon vesting/delivery.
• Footnote F2: Reporting person still has 56,382 restricted stock units that have not yet vested or been delivered.
• Shares owned after the transaction: not specified in the provided excerpt of the filing (see full SEC Form 4 for post-transaction holdings).

Context

• Withholding shares for taxes on vested RSUs is a routine administrative action and differs from a voluntary sale; it does not necessarily signal a change in the insider’s view of the company.
• The RSU grant date tied to the withholding was March 18, 2021; the withheld shares represent the employer satisfying tax obligations rather than the insider selling into the market.