RPID — RAPID MICRO BIOSYSTEMS, INC.
Price · 2024-08-26 → 2026-08-21
499 daily closes shownAnonymous view is capped at two years of history. A free account extends it to five, and Pro opens the whole archive back to 2021-07-15.
Performance
Technicals
Others in Healthcare
Measured signals that fired on RPID
| date | signal | measured base rate |
|---|---|---|
| 2026-04-09 | Short volume far above its own normal short | -0.76% over 21 days · t = -2.79 · n = 5,897 statistically distinguishable from its control group |
| 2026-03-13 | Short volume far above its own normal short | -0.76% over 21 days · t = -2.79 · n = 5,897 statistically distinguishable from its control group |
| 2026-03-12 | Cluster sale: three or more insiders insider | -0.37% over 21 days · t = -3.38 · n = 21,542 statistically distinguishable from its control group |
Excess return against a matched control group, on a point-in-time universe that includes delisted companies. Most families do not survive that. How the measurement works →
Insider transactions (Form 4)
| date | insider | what | shares | price | value |
|---|---|---|---|---|---|
| 2026-07-24 | Kollender Richard S Director | Option exercise | 1.8K | 0.75 | 1.4K |
| 2026-07-24 | Kollender Richard S Director | Option exercise | 1.7K | 0.75 | 1.3K |
| 2026-07-22 | Spignesi Robert G. Jr. PRESIDENT AND CEO | Option exercise | 1.4K | 0.75 | 1.1K |
| 2026-05-29 | PEI MELINDA LITHERLAND Director | Grant or award | 12.8K | 1.96 | 25.0K |
| 2026-05-29 | LOWENSTEIN INESE Director | Grant or award | 12.8K | 1.96 | 25.0K |
| 2026-05-29 | WIRTJES SEAN M CHIEF FINANCIAL OFFICER | Grant or award | 12.8K | 1.96 | 25.0K |
| 2026-05-29 | Spignesi Robert G. Jr. PRESIDENT AND CEO | Grant or award | 12.8K | 1.96 | 25.0K |
| 2026-05-29 | Malloy Kirk Director | Grant or award | 12.8K | 1.96 | 25.0K |
| 2026-05-21 | Kollender Richard S Director | Grant or award | 19.3K | 0.00 | 0 |
| 2026-05-21 | Bika Dafni Director | Grant or award | 19.3K | 0.00 | 0 |
Open-market purchases (code P) are the informative ones. Grants, option exercises and tax withholding are compensation mechanics, not decisions. How to read a Form 4 →
Largest institutional holders
| manager | value | shares |
|---|---|---|
| Bain Capital Life Sciences Investors, LLC | 19.1M | 8.4M |
| ABG-WTT Global Life Science Capital Partners GP Ltd | 4.2M | 1.8M |
| VANGUARD CAPITAL MANAGEMENT LLC | 2.2M | 982.5K |
| ESSEX INVESTMENT MANAGEMENT CO LLC | 2.0M | 883.9K |
| Advent International, L.P. | 1.3M | 552.4K |
| Evernest Financial Advisors, LLC | 1.0M | 432.5K |
| SEI INVESTMENTS CO | 646.5K | 284.8K |
| MILLENNIUM MANAGEMENT LLC | 643.0K | 283.3K |
| Legato Capital Management LLC | 624.1K | 274.9K |
| GEODE CAPITAL MANAGEMENT, LLC | 561.3K | 247.2K |
13F positions as of 2026-03-31, filed up to 45 days after quarter end. Long-only US equity — shorts and derivatives never appear. What 13F does and does not show →
Short selling
This is off-exchange short volume, not short interest: it is flow, not position, and 40–50% is normal because market makers short to fill your buy. Why that number misleads →
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