Rapid Micro Biosystems Inc. Class ARPID
13F holders, Q1 2026 (March 31)At the end of Q1 2026, 46 institutions reported holding Rapid Micro Biosystems Inc. Class A (RPID) in their 13F filings, up 4 from Q4 2025. 10 opened new positions and 8 sold out. The largest holders were Bain Capital Life Sciences Investors, LLC ($19.1M), ABG-WTT Global Life Science Capital Partners GP Ltd ($4.2M) and Vanguard Capital Management LLC ($2.2M). 2 famous investors held it, including Israel Englander (0.0% of Millennium Management's portfolio) and Jim Simons / Peter Brown (0.0% of Renaissance Technologies's portfolio).
- Company
- Rapid Micro Biosystems Inc. Class A
- CUSIP
- 75340L104
- Latest filing quarter
- Q2 2026
History
Number of 13F holders
Total Exit/New Position Q4 2025 → Q1 2026
| Institutions | Total Value | |
|---|---|---|
| New Positions | 10 | $407K |
| Exits | 8 | $2.8M |
All 13F filers, Q4 2025 → Q1 2026: 2,175,684 shares bought and 1,081,150 shares sold, net +1,094,534 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 46 holders
| Bain Capital Life Sciences Investors, LLC | 1.73% | No change | 8,434,560 | $19.1M |
| ABG-WTT Global Life Science Capital Partners GP Ltd | 34.13% | No change | 1,848,296 | $4.2M |
| Vanguard Capital Management LLC | 0.00% | — | 982,494 | $2.2M |
| Essex Investment Management Co. LLC | 0.32% | Add +1318.2% | 883,931 | $2.0M |
| Advent International, L.P. | 0.03% | Reduce -4.4% | 552,377 | $1.3M |
| Evernest Financial Advisors, LLC | 0.21% | Add +246.0% | 432,510 | $1.0M |
| Sei Investments Co. | 0.00% | Add +204.2% | 284,816 | $647K |
| Millennium Management | 0.00% | Add +143.2% | 283,280 | $643K |
| Legato Capital Management LLC | 0.06% | Add +1772.3% | 274,924 | $624K |
| Geode Capital Management, LLC | 0.00% | Add +13.6% | 247,177 | $561K |
| Susquehanna International Group, LLP | 0.00% | Add +23.1% | 212,114 | $481K |
| BlackRock, Inc. | 0.00% | Add +0.4% | 157,232 | $357K |
| Jane Street Group, LLC | 0.00% | Add +26.2% | 132,925 | $302K |
| Renaissance Technologies | 0.00% | Add +9.5% | 126,617 | $287K |
| 683 Capital Management, LLC | 0.03% | No change | 120,773 | $274K |
| Vanguard Fiduciary Trust Co. | 0.00% | — | 109,712 | $249K |
| State Street Corp. | 0.00% | Add +2.6% | 93,874 | $213K |
| Dimensional Fund Advisors LP | 0.00% | Add +55.9% | 87,589 | $199K |
| Goldman Sachs Group Inc. | 0.00% | Add +30.0% | 71,912 | $163K |
| Fifth Lane Capital, LP | 0.20% | Add +301.1% | 71,000 | $161K |
| XTX Topco Ltd | 0.00% | New | 61,070 | $139K |
| Northern Trust Corp. | 0.00% | Add +19.3% | 48,279 | $110K |
| Bank of America Corp. | 0.00% | Add +139.9% | 31,014 | $70K |
| Morgan Stanley | 0.00% | Reduce -7.0% | 29,207 | $66K |
| Algert Global LLC | 0.00% | New | 23,181 | $53K |
| Temasek Holdings (Private) Ltd | 0.00% | New | 21,818 | $50K |
| Barclays PLC | 0.00% | Reduce -13.1% | 21,595 | $49K |
| Catalyst Funds Management Pty Ltd | 0.01% | New | 21,200 | $48K |
| Graham Capital Management, L.P. | 0.00% | New | 20,000 | $45K |
| American Century Companies Inc. | 0.00% | No change | 16,922 | $38K |
| OMERS ADMINISTRATION Corp | 0.00% | Reduce -34.8% | 15,900 | $36K |
| Qube Research & Technologies Ltd | 0.00% | Reduce -53.4% | 15,410 | $35K |
| Marshall Wace, LLP | 0.00% | Reduce -75.8% | 15,224 | $35K |
| Osaic Holdings, Inc. | 0.00% | Reduce -2.1% | 14,000 | $32K |
| Banco Bilbao Vizcaya Argentaria, S.A. | 0.00% | New | 12,691 | $29K |
| Hudson Bay Capital Management LP | 0.00% | New | 12,524 | $28K |
| Nano Cap New Millennium Growth Fund L P | 0.03% | Reduce -50.0% | 12,500 | $28K |
| Vanguard Global Advisers, LLC | 0.00% | — | 11,630 | $26K |
| UBS Group AG | 0.00% | Add +27343.9% | 11,252 | $26K |
| BNP Paribas Financial Markets | 0.00% | Reduce -16.0% | 9,327 | $21K |
| Larson Financial Group LLC | 0.00% | New | 5,491 | $12K |
| Royal Bank of Canada | 0.00% | New | 719 | $2K |
| Resources Management Corp. /CT/ | 0.00% | No change | 500 | $1K |
| Cwm, LLC | 0.00% | New | 188 | $427 |
| JPMorgan Chase & Co. | 0.00% | No change | 109 | $242 |
| SBI Securities Co., Ltd. | 0.00% | No change | 15 | $34 |
"% of holder's portfolio" is RPID's weight in each manager's 13F, not the share of Rapid Micro Biosystems Inc. Class A the manager owns.