Sean M. Wirtjes, CFO of Rapid Micro Biosystems, Inc. ($RPID), made three open market sales of company shares in the past year, totaling $122,785. His most recent sale occurred on March 11, 2026. These transactions rank 9,274th out of 11,678 insiders by sale value, well below the average of $8.6 million and 6.4 transactions per insider. Wirtjes recorded no open market purchases during this period.
| Transaction Date | Company | Ticker | Insider Name | Title | Transaction Type | Security | Shares | Price | Shares Owned Following | Total Shares Outstanding | % of Owned | % of Outstanding |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| March 11, 2026 | RAPID MICRO BIOSYSTEMS, INC. | $RPID | WIRTJES SEAN M | CHIEF FINANCIAL OFFICER | S | Class A Common Stock | 7480 | $4.32 | 556,194.0000 | 44,956,131 | 1.33% | 0.02% |
| Feb. 20, 2026 | RAPID MICRO BIOSYSTEMS, INC. | $RPID | WIRTJES SEAN M | CHIEF FINANCIAL OFFICER | S | Class A Common Stock | 17254 | $3.92 | 563,674.0000 | 44,956,131 | 2.97% | 0.04% |
| Feb. 11, 2026 | RAPID MICRO BIOSYSTEMS, INC. | $RPID | WIRTJES SEAN M | CHIEF FINANCIAL OFFICER | A | Stock Option (Right to Buy) | 193000 | $0.00 | 193,000.0000 | 44,956,131 | 9999.99% | 0.43% |
| Feb. 11, 2026 | RAPID MICRO BIOSYSTEMS, INC. | $RPID | WIRTJES SEAN M | CHIEF FINANCIAL OFFICER | A | Class A Common Stock | 97000 | $0.00 | 580,928.0000 | 44,956,131 | 20.04% | 0.22% |
| Feb. 9, 2026 | RAPID MICRO BIOSYSTEMS, INC. | $RPID | WIRTJES SEAN M | CHIEF FINANCIAL OFFICER | S | Class A Common Stock | 6027 | $3.78 | 483,928.0000 | 44,956,131 | 1.23% | 0.01% |
| March 9, 2025 | RAPID MICRO BIOSYSTEMS, INC. | $RPID | WIRTJES SEAN M | CHIEF FINANCIAL OFFICER | F | Class A Common Stock | 7690 | $2.39 | 489,955.0000 | 43,575,705 | 1.55% | 0.02% |
| Feb. 18, 2025 | RAPID MICRO BIOSYSTEMS, INC. | $RPID | WIRTJES SEAN M | CHIEF FINANCIAL OFFICER | A | Class A Common Stock | 160000 | $0.00 | 497,645.0000 | 43,575,705 | 47.39% | 0.37% |
| Feb. 18, 2025 | RAPID MICRO BIOSYSTEMS, INC. | $RPID | WIRTJES SEAN M | CHIEF FINANCIAL OFFICER | A | Stock Option (Right to Buy) | 121000 | $0.00 | 121,000.0000 | 43,575,705 | 9999.99% | 0.28% |
| Feb. 11, 2025 | RAPID MICRO BIOSYSTEMS, INC. | $RPID | WIRTJES SEAN M | CHIEF FINANCIAL OFFICER | F | Class A Common Stock | 4621 | $2.68 | 337,645.0000 | 43,575,705 | 1.35% | 0.01% |
| Feb. 6, 2025 | RAPID MICRO BIOSYSTEMS, INC. | $RPID | WIRTJES SEAN M | CHIEF FINANCIAL OFFICER | F | Class A Common Stock | 5891 | $3.10 | 342,266.0000 | 43,575,705 | 1.69% | 0.01% |
| Aug. 7, 2024 | RAPID MICRO BIOSYSTEMS, INC. | $RPID | WIRTJES SEAN M | CHIEF FINANCIAL OFFICER | P | Class A Common Stock | 10000 | $0.78 | 348,157.0000 | 43,024,039 | 2.96% | 0.02% |
| March 11, 2024 | RAPID MICRO BIOSYSTEMS, INC. | $RPID | WIRTJES SEAN M | CHIEF FINANCIAL OFFICER | F | Class A Common Stock | 7454 | $0.98 | 325,403.0000 | 43,024,039 | 2.24% | 0.02% |
| Feb. 12, 2024 | RAPID MICRO BIOSYSTEMS, INC. | $RPID | WIRTJES SEAN M | CHIEF FINANCIAL OFFICER | F | Class A Common Stock | 3794 | $0.96 | 332,857.0000 | 43,024,039 | 1.13% | 0.01% |
| Feb. 6, 2024 | RAPID MICRO BIOSYSTEMS, INC. | $RPID | WIRTJES SEAN M | CHIEF FINANCIAL OFFICER | A | Stock Option (Right to Buy) | 103000 | $0.00 | 103,000.0000 | 43,024,039 | 9999.99% | 0.24% |
| Feb. 6, 2024 | RAPID MICRO BIOSYSTEMS, INC. | $RPID | WIRTJES SEAN M | CHIEF FINANCIAL OFFICER | A | Class A Common Stock | 51000 | $0.00 | 336,651.0000 | 43,024,039 | 17.85% | 0.12% |
| Sept. 6, 2023 | RAPID MICRO BIOSYSTEMS, INC. | $RPID | WIRTJES SEAN M | CHIEF FINANCIAL OFFICER | P | Class A Common Stock | 10000 | $0.99 | 285,651.0000 | 0 | 3.63% | 0.00% |
| March 9, 2023 | RAPID MICRO BIOSYSTEMS, INC. | $RPID | WIRTJES SEAN M | CHIEF FINANCIAL OFFICER | A | Stock Option (Right to Buy) | 198600 | $0.00 | 198,600.0000 | 0 | 9999.99% | 0.00% |
| March 9, 2023 | RAPID MICRO BIOSYSTEMS, INC. | $RPID | WIRTJES SEAN M | CHIEF FINANCIAL OFFICER | A | Class A Common Stock | 78600 | $0.00 | 268,912.0000 | 0 | 41.30% | 0.00% |
| Feb. 13, 2023 | RAPID MICRO BIOSYSTEMS, INC. | $RPID | WIRTJES SEAN M | Chief Financial Officer | F | Class A Common Stock | 4621 | $1.30 | 190,312.0000 | 0 | 2.37% | 0.00% |