Form 4: GLAUKOS CFO Sells Shares, Manages RSU Tax Obligations

GLAUKOS Corp's SVP & CFO, Alex R. Thurman, reported sales of common stock and shares withheld for tax obligations related to RSU vesting.

Summary

• Alex R. Thurman, SVP & Chief Financial Officer of GLAUKOS Corp (GKOS), reported changes in beneficial ownership of common stock.
• On March 23, 2026, 1,230 shares were withheld by the Issuer at a price of $106.84 per share to cover tax withholding obligations upon the vesting and delivery of restricted stock units (RSUs) previously granted on March 22, 2023.
• Following this transaction, Thurman beneficially owned 48,019 shares, which included 9,761 restricted stock units that had not yet vested or been delivered.
• On March 24, 2026, Thurman sold 1,521 shares of common stock at a price of $105.24 per share. This sale was executed pursuant to a Rule 10b5-1 trading plan adopted on December 15, 2025.
• Also on March 24, 2026, an additional 2,020 shares were withheld by the Issuer at a price of $105.23 per share for tax withholding obligations related to the vesting and delivery of restricted stock units previously granted on March 24, 2022.
• After all reported transactions, Thurman beneficially owned 44,478 shares, including 5,230 restricted stock units that have not yet vested or been delivered.

Sentiment

Score: 5

Explanation: StockSavvy.ai views this as a neutral filing. While there is insider selling, it was conducted under a pre-arranged 10b5-1 plan, and a significant portion of the disposed shares were for tax withholding related to RSU vesting, which is a routine compensation event.

Negatives

• The sale of 1,521 shares by a senior executive, even if pre-planned, represents a reduction in insider ownership.

Future Outlook

This Form 4 filing does not contain any forward-looking statements or guidance regarding the company's future outlook.

Industry Context

StockSavvy.ai notes that insider transactions, particularly sales, are routinely monitored by investors for insights into management's perception of the company's valuation. While sales under a pre-arranged 10b5-1 plan are common for executive liquidity and diversification, they are still a reduction in insider holdings. Tax withholdings related to RSU vesting are standard compensation events and do not typically signal a change in sentiment.

Stakeholder Impact

• Shareholders: The transactions represent a minor reduction in insider ownership. The sale under a 10b5-1 plan suggests a planned liquidity event rather than a reaction to new negative information, thus the direct impact on shareholder sentiment is likely minimal.

Key Dates

Recommendation

The filing details routine insider transactions, including tax-related share withholdings and a pre-planned sale under a 10b5-1 plan. These transactions do not provide new fundamental information about the company's performance or future prospects that would warrant a change in investment thesis. Therefore, a 'hold' recommendation is appropriate as the filing itself does not present a compelling reason to buy or sell.

Keywords

GLAUKOS Corp, GKOS, Form 4, Insider Trading, Alex R. Thurman, CFO, Stock Sale, Restricted Stock Units, RSU Vesting, Tax Withholding, 10b5-1 Plan