🕵️ Rapid Micro Biosystems, Inc. ($RPID)
SEC insider & ownership activity, last 12 months · CIK 1380106 · every row links its SEC filing
Over the last 12 months insiders sold $1.1M with no open-market buying against it. Longitude Capital Partners II, LLC sold $664K (Jan–Feb). No red-flag 8-Ks in the window.
Monthly net open-market insider flow, last 12 months (up = net buying)
Insider flow
0 buyers, $0 (0 lots) · 4 sellers, $1.1M (14 lots)
| Insider | Buys | Bought | Sells | Sold | Last |
|---|---|---|---|---|---|
| Longitude Capital Partners II, LLC | 0 | – | 5 | $664K | Feb 4, 2026 |
| Robert G. Spignesi Jr. | 0 | – | 3 | $271K | Mar 10, 2026 |
| Sean M. Wirtjes | 0 | – | 3 | $123K | Mar 11, 2026 |
| Wilson John J. Addington | 0 | – | 3 | $80K | Mar 11, 2026 |
5%+ holders
| Holder | Stake | Class | Schedule | Event | |
|---|---|---|---|---|---|
| BAIN Capital Life Sciences Fund, L.P. | 16.8% | Class A | 13G | Aug 14, 2026 | filing ↗ |
| Longitude Capital Partners II, LLC | 8.6% | 13G | May 15, 2026 | filing ↗ | |
| Longitude Venture Partners II, L.P. | 8.6% | 13G | May 15, 2026 | filing ↗ | |
| Patrick G. Enright | 8.6% | 13G | May 15, 2026 | filing ↗ | |
| Juliet Tammenoms Bakker | 8.6% | 13G | May 15, 2026 | filing ↗ | |
| Armistice Capital, LLC | 7.3% | Class A | 13G | Aug 14, 2026 | filing ↗ |
| Steven Boyd | 7.3% | Class A | 13G | Aug 14, 2026 | filing ↗ |
| Robert G. Spignesi Jr. | 6.3% | 13D | Mar 28, 2024 | filing ↗ | |
| Endeavour Medtech Growth II LP | 5.7% | 13G | Feb 13, 2026 | filing ↗ | |
| Endeavour Medtech Growth II Parallel LP | 5.7% | 13G | Feb 13, 2026 | filing ↗ | |
| Endeavour Medtech II GP Limited | 5.7% | 13G | Feb 13, 2026 | filing ↗ |
Planned insider sales (Form 144)
| Seller | Planned | Approx. sale date | |
|---|---|---|---|
| Wilson John J. Addington | $17K | Jul 8, 2026 | filing ↗ |
| Wilson John J. Addington | $11K | Jul 1, 2026 | filing ↗ |
| Wilson John J. Addington | $6K | Jun 22, 2026 | filing ↗ |
| Wilson John J. Addington | $9K | Jun 10, 2026 | filing ↗ |
| Sean M. Wirtjes | $32K | Mar 11, 2026 | filing ↗ |
| Wilson John J. Addington | $41K | Mar 11, 2026 | filing ↗ |
| Robert G. Spignesi Jr. | $74K | Mar 10, 2026 | filing ↗ |
| Wilson John J. Addington | $21K | Feb 20, 2026 | filing ↗ |
| Sean M. Wirtjes | $68K | Feb 20, 2026 | filing ↗ |
| Robert G. Spignesi Jr. | $149K | Feb 19, 2026 | filing ↗ |
| Sean M. Wirtjes | $23K | Feb 9, 2026 | filing ↗ |
| Robert G. Spignesi Jr. | $49K | Feb 9, 2026 | filing ↗ |
| Wilson John J. Addington | $17K | Feb 9, 2026 | filing ↗ |
Material events (8-K)
| Item | Event date | |
|---|---|---|
| Earnings (2.02) | Aug 7, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Aug 7, 2026 | filing ↗ |
| Shareholder vote (5.07) | May 21, 2026 | filing ↗ |
| Material agreement (1.01) | May 18, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | May 18, 2026 | filing ↗ |
| Earnings (2.02) | May 13, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | May 13, 2026 | filing ↗ |
| Officer/director changes (5.02) | Mar 23, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Mar 23, 2026 | filing ↗ |
| Earnings (2.02) | Mar 12, 2026 | filing ↗ |
| Reg FD disclosure (7.01) | Mar 12, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Mar 12, 2026 | filing ↗ |
| Earnings (2.02) | Jan 13, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Jan 13, 2026 | filing ↗ |
| Earnings (2.02) | Nov 7, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Nov 7, 2025 | filing ↗ |