Insider · CIK 0001289733
Sean M Wirtjes
Files at RPID (RAPID MICRO BIOSYSTEMS, INC.). First filing Feb 10, 2026, latest Mar 12, 2026.
Sean M Wirtjes files SEC Form 4 as CFO at RPID (RAPID MICRO BIOSYSTEMS, INC.). Since Feb 10, 2026, Sean M Wirtjes has reported 0 open-market buys worth $0 and 3 open-market sells worth $123k, the latest filed on Mar 12, 2026.
A track record needs three past buys with six months of prices behind them; Sean M Wirtjes has 0, so none is measured yet.
The newest scored trade: sold $32k of RPID on Mar 11, 2026, filed Mar 12, 2026, scored 42 (moderate). In the last 12 months: 0 buys worth $0 and 3 sells worth $123k.
Where the trades landed
Last year at the company this insider has traded most, with each buy and sell on the bar it happened.
RPID: RAPID MICRO BIOSYSTEMS, INC.
Daily candles, adjusted for splits and dividends. Green arrows are insider buys, red are sells, sized by value. Click a marked bar to open the signal.Charts by TradingView Lightweight Charts™
Signals
This insider’s open-market buys and sells, scored.
| Score | Company | Value | Holdings | Price context | Filed |
|---|---|---|---|---|---|
| 42Moderate | RAPID MICRO BIOSYSTEMS, INC. | $32k 7,480 shares | -1% | +121% from low-6% from high | |
| 45Moderate | RAPID MICRO BIOSYSTEMS, INC. | $68k 17,254 shares | -3% | +96% from low-17% from high | |
| 37Weak | RAPID MICRO BIOSYSTEMS, INC. | $23k 6,027 shares | -1% | +89% from low-20% from high |
Planned sales
Form 144 notices this insider filed before selling restricted or control stock, newest first.
| Filed | Company | Shares | Value | Sale date | Past 3 months |
|---|---|---|---|---|---|
| Mar 11, 2026 | RPID RAPID MICRO BIOSYSTEMS, INC. | 7,480 0.02% of outstanding | $32k | Mar 11, 2026 | $90k |
| Feb 20, 2026 | RPID RAPID MICRO BIOSYSTEMS, INC. | 17,254 0.04% of outstanding | $68k | Feb 20, 2026 | $23k |
| Feb 9, 2026 | RPID RAPID MICRO BIOSYSTEMS, INC. | 6,027 0.02% of outstanding | $23k | Feb 9, 2026 | none |
Transactions
Every row this insider has filed, 8 in all, newest first.
| Date | Company | Transaction | Shares | Price | Value | Holdings after | Filed |
|---|---|---|---|---|---|---|---|
| May 29, 2026 | RPID RAPID MICRO BIOSYSTEMS, INC. | AGrant or award Class A Common Stock | +12,787 | $1.96 | $25k | 568,981 | Jun 2, 2026 |
| May 29, 2026 | RPID RAPID MICRO BIOSYSTEMS, INC. | AGrant or award Series A Warrant (right to buy)derivative | +12,787 | $0.00 | $0 | 12,787 | Jun 2, 2026 |
| May 29, 2026 | RPID RAPID MICRO BIOSYSTEMS, INC. | AGrant or award Series B Warrant (right to buy)derivative | +12,787 | $0.00 | $0 | 12,787 | Jun 2, 2026 |
| Mar 11, 2026 | RPID RAPID MICRO BIOSYSTEMS, INC. | SOpen-market sale Class A Common Stock | -7,480 | $4.32 | $32k | 556,194 | Mar 12, 2026 |
| Feb 20, 2026 | RPID RAPID MICRO BIOSYSTEMS, INC. | SOpen-market sale Class A Common Stock | -17,254 | $3.92 | $68k | 563,674 | Feb 20, 2026 |
| Feb 11, 2026 | RPID RAPID MICRO BIOSYSTEMS, INC. | AGrant or award Class A Common Stock | +97,000 | $0.00 | $0 | 580,928 | Feb 13, 2026 |
| Feb 11, 2026 | RPID RAPID MICRO BIOSYSTEMS, INC. | AGrant or award Stock Option (Right to Buy)derivative | +193,000 | $0.00 | $0 | 193,000 | Feb 13, 2026 |
| Feb 9, 2026 | RPID RAPID MICRO BIOSYSTEMS, INC. | SOpen-market sale Class A Common Stock | -6,027 | $3.78 | $23k | 483,928 | Feb 10, 2026 |
Questions about Sean M Wirtjes
Answered from the filings on this page, as of the latest one.
Is Sean M Wirtjes buying or selling?
In the last 12 months Sean M Wirtjes reported 0 open-market buys worth $0 and 3 open-market sells worth $123k on SEC Form 4; the latest was sold $32k of RPID on Mar 11, 2026. Grants, option exercises and tax withholding are not counted.
How did Sean M Wirtjes's past buys perform?
Not measured yet. InsiderTell needs three past buys with six months of prices to publish a track record, and Sean M Wirtjes has 0.
Where does Sean M Wirtjes file Form 4?
Sean M Wirtjes has filed Form 4 at RPID (RAPID MICRO BIOSYSTEMS, INC.) as CHIEF FINANCIAL OFFICER. A Form 4 is required of officers, directors and holders of more than 10% of a share class within two business days of a trade.
Not investment advice. Scores and forward returns are decision support built from public SEC filings and past prices; they describe what happened after comparable filings, not what will happen after this one. Do your own research and size your risk.