WIRTJES SEAN M 4

What Happened

• CFO Sean M. Wirtjes reported a sale of 17,254 shares of Rapid Micro Biosystems (RPID) on February 20, 2026. The shares were sold at $3.92 each for a total proceeds of $67,687.
• This sale was executed as an automatic disposition to cover tax obligations related to the vesting of restricted stock units (RSUs), a routine tax-withholding event rather than an independent discretionary sale.

Key Details

• Transaction date: 2026-02-20; Price: $3.92 per share; Total proceeds: $67,687.
• Transaction type reported as a sale (S); footnote F1: sale was automatic to cover taxes on RSU vesting.
• Shares owned after the transaction: Not disclosed in this Form 4.
• Filing date / period of report: 2026-02-20 (no late filing indicated in the provided record).

Context

• This was a tax-withholding sale associated with RSU vesting (common practice): such sales are generally administrative and do not necessarily signal the insider’s view of the company.
• For retail investors, purchases are typically more informative about insider confidence; routine withholding sales like this are common and often neutral in isolation.