Rapid Micro Biosystems, Inc.: which funds bought and sold
Institutions that bought and sold Rapid Micro Biosystems shares in Q2 2026, from the holdings they reported to the SEC on Form 13F for March 31, 2026 and June 30, 2026.
Between March 31, 2026 and June 30, 2026, 14 institutions that filed 13F reports for both quarters added to or opened positions in Rapid Micro Biosystems, and 28 cut or closed them. Together they added a net 1.8M shares, +11.8% on what they held at the start of the quarter. Active managers and hedge funds on our list were net buyers of 3.2M shares (+506.2%); index fund managers were net buyers of 7,603 shares (+0.5%). 5 opened a new position and 16 sold out entirely.
Bought, Q2 2026 14 institutions, 5 of them new holders Sold, Q2 2026 28 institutions, 16 of them sold out
Net change, all compared +1.8M shares (+11.8%)
Net change, active managers +3.2M shares (+506.2%), 4 bought, 7 sold
Buyers versus sellers
14 bought 7 28 sold
Active managers and hedge funds 4 bought · 7 sold · +3.2M
Index fund managers 2 bought · 3 sold · +7,603
Other institutions 8 bought · 18 sold · −1.4M
Biggest buyers
| Institution | Change in shares | Shares June 30, 2026 | Value |
|---|---|---|---|
| Armistice Capital, LLC Hedge fund | +3.3M New position | 3.3M | $5.8M |
| Renaissance Technologies LLC Hedge fund | +85K +67.5% | 212K | $366,935 |
| Evernest Financial Advisors, LLC | +73K +17.0% | 506K | $875,380 |
| Blackrock, Inc. Index funds | +33K +20.7% | 190K | $328,410 |
| HRT Financial LP | +23K New position | 23K | $39,000 |
| Xtx Topco Ltd | +19K +30.6% | 80K | $137,928 |
| Dimensional Fund Advisors LP | +17K +19.0% | 104K | $180,253 |
| Citadel Advisors LLC Hedge fund | +16K New position | 16K | $27,926 |
| Algert Global LLC Hedge fund | +15K +65.3% | 38K | $66,271 |
| Larson Financial Group LLC | +2,904 +52.9% | 8,395 | $14,523 |
| Tower Research Capital LLC (TRC) | +1,900 New position | 1,900 | $3,287 |
| Vanguard Fiduciary Trust Co Index funds | +772 +0.7% | 110K | $191,137 |
| Osaic Holdings, Inc. | +300 +2.1% | 14K | $24,739 |
| Caitong International Asset Management Co., Ltd | +35 New position | 35 | $61 |
| Institution | Change in shares | Shares June 30, 2026 | Value |
|---|---|---|---|
| Armistice Capital, LLC Hedge fund | +3.3M New position | 3.3M | $5.8M |
| Renaissance Technologies LLC Hedge fund | +85K +67.5% | 212K | $366,935 |
| Citadel Advisors LLC Hedge fund | +16K New position | 16K | $27,926 |
| Algert Global LLC Hedge fund | +15K +65.3% | 38K | $66,271 |
Biggest sellers
| Institution | Change in shares | Shares June 30, 2026 | Value |
|---|---|---|---|
| Essex Investment Management Co LLC | −521K −59.0% | 363K | $627,464 |
| Sei Investments Co | −218K −76.5% | 67K | $115,683 |
| Susquehanna International Group, LLP | −212K Sold out | 0 | — |
| Advent International, L.P. | −173K −31.2% | 380K | $657,044 |
| 683 Capital Management, LLC Hedge fund | −121K Sold out | 0 | — |
| Jane Street Group, LLC | −107K −80.5% | 26K | $44,861 |
| Goldman Sachs Group Inc | −72K Sold out | 0 | — |
| Fifth Lane Capital, LP | −71K Sold out | 0 | — |
| Millennium Management LLC Hedge fund | −47K −16.5% | 237K | $409,316 |
| Bank Of America Corp | −31K Sold out | 0 | — |
| Temasek Holdings (Private) Ltd | −22K Sold out | 0 | — |
| Barclays PLC | −21K −98.4% | 337 | $583 |
| Catalyst Funds Management Pty Ltd | −21K Sold out | 0 | — |
| Graham Capital Management, L.P. Hedge fund | −20K Sold out | 0 | — |
| Geode Capital Management, LLC Index funds | −19K −7.7% | 228K | $394,706 |
| Omers Administration Corp | −16K Sold out | 0 | — |
| Qube Research & Technologies Ltd Hedge fund | −15K Sold out | 0 | — |
| Marshall Wace, LLP Hedge fund | −15K Sold out | 0 | — |
| Banco Bilbao Vizcaya Argentaria, S.A. | −13K Sold out | 0 | — |
| Hudson Bay Capital Management LP Hedge fund | −13K Sold out | 0 | — |
| Institution | Change in shares | Shares June 30, 2026 | Value |
|---|---|---|---|
| 683 Capital Management, LLC Hedge fund | −121K Sold out | 0 | — |
| Millennium Management LLC Hedge fund | −47K −16.5% | 237K | $409,316 |
| Graham Capital Management, L.P. Hedge fund | −20K Sold out | 0 | — |
| Qube Research & Technologies Ltd Hedge fund | −15K Sold out | 0 | — |
| Marshall Wace, LLP Hedge fund | −15K Sold out | 0 | — |
| Hudson Bay Capital Management LP Hedge fund | −13K Sold out | 0 | — |
| American Century Companies Inc Active manager | −5,284 −31.2% | 12K | $20,134 |
New positions
| Institution | Shares | Value June 30, 2026 |
|---|---|---|
| Armistice Capital, LLCHedge fund | 3.3M | $5.8M |
| HRT Financial LP | 23K | $39,000 |
| Citadel Advisors LLCHedge fund | 16K | $27,926 |
| Tower Research Capital LLC (TRC) | 1,900 | $3,287 |
| Caitong International Asset Management Co., Ltd | 35 | $61 |
Sold out
| Institution | Shares | Value March 31, 2026 |
|---|---|---|
| Susquehanna International Group, LLP | 212K | $481,499 |
| 683 Capital Management, LLCHedge fund | 121K | $274,155 |
| Goldman Sachs Group Inc | 72K | $163,240 |
| Fifth Lane Capital, LP | 71K | $161,170 |
| Bank Of America Corp | 31K | $70,402 |
| Temasek Holdings (Private) Ltd | 22K | $49,527 |
| Catalyst Funds Management Pty Ltd | 21K | $48,124 |
| Graham Capital Management, L.P.Hedge fund | 20K | $45,400 |
| Omers Administration Corp | 16K | $36,093 |
| Qube Research & Technologies LtdHedge fund | 15K | $34,981 |
Who holds the shares
- Institutions reporting
- 33
- Ten largest holders
- 94.9% of 13F-reported shares
- Index fund managers
- 9.5% of 13F-reported shares
- Active managers and hedge funds
- 22.1% of 13F-reported shares
| Type | Bought | Sold | New | Sold out | Net change in shares | Net % |
|---|---|---|---|---|---|---|
| Active managers and hedge funds | 4 | 7 | 2 | 5 | +3.2M | +506.2% |
| Index fund managers | 2 | 3 | 0 | 0 | +7,603 | +0.5% |
| Other institutions | 8 | 18 | 3 | 11 | −1.4M | −10.4% |
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