Wilson John J. Addington 4

What Happened John J. Addington, Chief Operating Officer of Rapid Micro Biosystems (RPID), sold 5,403 shares on February 20, 2026 at $3.92 per share, generating proceeds of $21,196. The filing shows this was a sale (S) and the disposition was tied to withholding for taxes associated with the vesting of restricted stock units.

Key Details

• Transaction date: 2026-02-20; price: $3.92 per share; total proceeds: $21,196.
• Transaction type: Sale (open-market/private sale classification shown as S).
• Footnote: F1 — automatic sale to cover tax obligations from RSU vesting (tax withholding).
• Shares owned after the transaction: not specified in the provided filing summary.
• Filing timeliness: Reported with the same period date (no late filing indicated).

Context This was an automatic, tax-withholding sale related to RSU vesting rather than an independent decision to liquidate holdings; such automatic withholding sales are common and generally considered routine rather than a direct signal about the insider’s view on the company.