Shiu Lambert 4

What Happened Shiu Lambert, Chief Accounting Officer of Penumbra Inc. (PEN), had 150 shares withheld by the company on March 15, 2026 to satisfy tax withholding obligations related to the vesting of restricted stock units (RSUs). The withholding was recorded at $336.18 per share, for a total value of $50,427. This was a tax-withholding disposition (not an open-market sale or purchase).

Key Details

• Transaction date: 2026-03-15; filing date: 2026-03-17 (appears timely).
• Price per share: $336.18; total value of shares withheld: $50,427.
• Shares owned after transaction: not specified in the provided filing excerpt.
• Footnotes from the filing:
  • F1: Shares were withheld by the issuer to satisfy tax withholding obligations in connection with the vesting of RSUs.
  • F2: A portion of these shares is subject to vesting.
  • F3: Some shares are held by the reporting person’s spouse in an IRA.
• Transaction code: F (tax withholding).

Context Tax-withholding by the company is a routine administrative step when RSUs vest and does not represent an intentional open-market sale or a change in investment conviction. For retail investors, purchases or open-market sales by insiders are generally more informative than withholding events, which simply cover the tax liability associated with equity compensation.