Form 4: Pulmonx CEO Sells Shares for Tax Obligations

Pulmonx Corporation's President and CEO, Steven S. Williamson, sold common stock to cover tax withholding obligations related to RSU vesting.

Summary

• Steven S. Williamson, President and CEO of Pulmonx Corporation, reported two sales of common stock on September 2, 2025.
• A total of 9,648 shares were sold across two transactions (5,118 shares and 4,530 shares).
• The sales were executed at a price of $1.6 per share.
• The purpose of these sales was to cover tax withholding obligations associated with the vesting of Restricted Stock Units (RSUs) granted on March 15, 2024, and March 3, 2025.
• Following these transactions, Williamson beneficially owns 358,967 shares of Pulmonx common stock.
• This beneficial ownership includes 2,500 shares acquired under the Issuer's 2020 Employee Stock Purchase Plan on August 15, 2025.

Sentiment

Score: 6

Explanation: The transactions are routine 'sell to cover' for tax obligations related to RSU vesting, which is a neutral event. The CEO still holds a significant number of shares and also acquired shares via ESPP, indicating continued alignment with shareholder interests.

Positives

• The sales are explicitly for tax withholding purposes, which is a routine event for equity compensation and not indicative of a discretionary sale based on a change in management's outlook.
• Management still holds a significant number of shares (358,967), maintaining alignment of interests with shareholders.
• The CEO acquired 2,500 shares through the Employee Stock Purchase Plan (ESPP) on August 15, 2025, demonstrating continued participation in employee ownership programs.

Negatives

• A reduction in direct beneficial ownership by 9,648 shares due to the sales.

Future Outlook

NA

Industry Context

NA

Stakeholder Impact

• Shareholders: Minor reduction in direct insider ownership, but the nature of the sale (tax-related) suggests no change in management confidence. Continued significant insider holdings maintain alignment.
• Employees: The CEO's participation in the Employee Stock Purchase Plan (ESPP) could be seen as a positive signal regarding employee benefits and ownership culture.

Key Dates

Recommendation

The reported transactions are routine 'sell to cover' sales for tax obligations associated with RSU vesting, which are not indicative of a change in management's fundamental view of the company. The CEO retains a substantial equity stake and also participated in the Employee Stock Purchase Plan, suggesting continued alignment with long-term shareholder value. Therefore, the filing itself does not provide new information warranting a change in investment thesis.

Keywords

Pulmonx, LUNG, Steven S. Williamson, Insider Trading, Form 4, Stock Sale, RSU Vesting, Tax Withholding, CEO, Director, Employee Stock Purchase Plan