Wilson John J. Addington 4

What Happened John J. Addington, Chief Operating Officer of RAPID Micro Biosystems (RPID), reported the sale of 9,603 shares on 2026-03-11 at $4.32 per share, totaling $41,467. The filing reports the transaction as a sale (code S) and includes a footnote that the shares were automatically sold to cover tax obligations from restricted stock unit (RSU) vesting — a routine "sell-to-cover" transaction rather than an active investment decision.

Key Details

• Transaction date: 2026-03-11; Report filed: 2026-03-12 (filed the next day).
• Price and amount: 9,603 shares sold at $4.32/share, total proceeds ~$41,467.
• Reported method: Sale (open market or private sale) with footnote F1 indicating automatic sale to cover taxes on RSU vesting.
• Shares owned after transaction: Not specified in the provided filing excerpt.
• Timeliness: Filing appears timely (reported the day after the transaction).

Context Sell-to-cover transactions are common when RSUs vest and are typically used only to satisfy tax withholding obligations; they do not necessarily signal the insider's view on the company. For retail investors, outright purchases or large discretionary sales can be more informative than routine tax-related sales.