Spignesi Robert G. Jr. 4

What Happened

Robert G. Spignesi Jr., President, CEO and a director of Rapid Micro Biosystems (RPID), disposed of 12,840 shares on 2026-02-09. The shares were sold at $3.78 per share for a total proceeds amount of $48,570. According to the filing footnote, this sale was an automatic sale to cover tax withholding related to the vesting of restricted stock units (RSUs), not an open-market discretionary sell for investment reasons.

Key Details

• Transaction date: 2026-02-09; Sale price: $3.78 per share; Shares sold: 12,840; Total proceeds: $48,570.
• Filing date / Period of report: Filed 2026-02-10 reporting the 2026-02-09 transaction (timely filing).
• Shares owned after transaction: Not reported on this Form 4.
• Footnote: F1 — automatic sale to cover tax obligations from RSU vesting (tax withholding).
• Transaction code: S (Sale); footnote indicates tax withholding (common with RSU vesting).

Context

This was a tax-withholding sale tied to RSU vesting — a routine administrative transaction that converts part of vested equity into cash to satisfy tax obligations. Such transactions are common for executives receiving equity compensation and do not necessarily indicate a change in the insider’s view on the company.