Form 4: Penumbra CAO Sells Shares for Tax Obligations

Penumbra's Chief Accounting Officer, Lambert Shiu, disposed of 150 shares of common stock to cover tax withholding obligations related to restricted stock unit vesting.

Summary

• Lambert Shiu, Chief Accounting Officer of Penumbra Inc (PEN), reported a transaction on March 15, 2026.
• The transaction involved the disposition of 150 shares of Penumbra Common Stock.
• The shares were withheld by the Issuer to satisfy tax withholding obligations in connection with the vesting of restricted stock units.
• The price per share for the disposed securities was $336.18.
• Following this transaction, Lambert Shiu directly beneficially owns 39,323 shares of Common Stock, a portion of which is subject to vesting.
• Additionally, 300 shares are indirectly beneficially owned by the Reporting Person's spouse in an IRA.

Sentiment

Score: 5

Explanation: StockSavvy.ai views this filing as neutral. It reports a routine insider transaction for tax withholding, which is a common event and typically does not reflect a change in company fundamentals or management's outlook.

Future Outlook

N/A

Industry Context

StockSavvy.ai notes that transactions involving the disposition of shares for tax withholding purposes are a routine occurrence for executives receiving equity compensation. These types of insider sales are generally not indicative of management's sentiment towards the company's future performance or broader industry trends, as they are typically pre-planned to cover tax liabilities upon the vesting of restricted stock units.

Stakeholder Impact

• Shareholders: Minimal impact, as this is a routine tax-related sale and not a discretionary open-market sale.

Key Dates

Keywords

Penumbra, PEN, Form 4, Insider Transaction, Stock Sale, Tax Withholding, Restricted Stock Units, Lambert Shiu, Chief Accounting Officer