Form 4: Penumbra Officer's Stock Transactions and RSU Grant

Penumbra's Chief Accounting Officer, Lambert Shiu, reported tax-related stock dispositions and a new RSU grant.

Summary

• Lambert Shiu, Chief Accounting Officer of Penumbra Inc. (PEN), reported transactions involving common stock.
• On November 15, 2025, 346 shares and 506 shares were withheld by the Issuer to satisfy tax withholding obligations in connection with the vesting of restricted stock units (RSUs), at a price of $280.07 per share.
• On November 17, 2025, Shiu was granted 3,580 RSUs under the Issuer's Amended and Restated 2014 Equity Incentive Plan.
• These granted RSUs will vest equally on an annual basis, with 1/4 vesting each year, beginning on November 15, 2026, subject to continued service.
• Following these transactions, Shiu directly beneficially owns 35,565 shares of common stock, with 300 additional shares held indirectly by a spouse's IRA.
• The reported beneficial ownership includes 81 shares purchased under the Issuer's Employee Stock Purchase Plan on May 19, 2025.

Sentiment

Score: 6

Explanation: The filing reports routine insider transactions, including tax-related dispositions and a new RSU grant, which is a standard component of executive compensation and aligns management incentives. This is generally a neutral to slightly positive event.

Positives

• Grant of 3,580 Restricted Stock Units (RSUs) to the Chief Accounting Officer, aligning management's long-term interests with shareholder value.

Negatives

• Disposition of 852 shares (346 + 506) to cover tax withholding obligations related to RSU vesting, a routine but non-value-additive transaction.

Future Outlook

The granted Restricted Stock Units (RSUs) will vest in equal annual installments over four years, beginning November 15, 2026, subject to the reporting person's continued service.

Industry Context

NA

Stakeholder Impact

• Shareholders: The RSU grant aligns the Chief Accounting Officer's interests with long-term shareholder value.
• Employees: The Employee Stock Purchase Plan (ESPP) is mentioned as a source of previously acquired shares, indicating a benefit for employees.

Next Steps

• First vesting of granted RSUs on November 15, 2026, contingent on continued service.

Key Dates

Recommendation

This Form 4 details routine insider transactions for Penumbra's Chief Accounting Officer, Lambert Shiu, involving the vesting of restricted stock units, tax withholdings, and a new RSU grant. These are standard compensation events and do not provide new fundamental information to alter an investment thesis. The transactions reflect ongoing executive compensation practices rather than a change in management's outlook on the company's prospects, thus warranting a 'hold' recommendation based solely on this filing.

Keywords

Penumbra, PEN, Form 4, Insider Transaction, Restricted Stock Units, RSU Grant, Chief Accounting Officer, Lambert Shiu, Stock Compensation