RPID
Rapid Micro Biosystems, Inc.
$1.72
+0.01 (+0.58%)
At close · Jul 2
Market Cap
$87.29M
Shares
46,169,202
Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.
Holders: 47
Total Value: $43,967,885
Total Shares: 19,369,124
Institutional Ownership Trend
19 quarters
Holder Concentration
Across 46 13F filers · Δ vs Dec 31, 2025Top Holder
53.2%
−4.4 pts
Top 5
80.2%
−3.2 pts
Top 10
89.8%
−0.6 pts
HHI
3,079
Highly concentrated−492
Quarterly Activity
vs Dec 31, 2025
New
14
Increased
17
Decreased
9
Sold Out
10
Unchanged
7
Holder count:
+4
Institutional value:
-10.2%
Shares held:
+14.8%
Top Buyers
vs Dec 31, 2025| Institution | Added | Now Holds | Open |
|---|---|---|---|
| Small ESSEX INVESTMENT MANAGEMENT CO LLC | +821,605 | 883,931 | |
| Small Evernest Financial Advisors, LLC | +307,510 | 432,510 | |
| Mid Legato Capital Management LLC | +260,240 | 274,924 | |
| Large SEI INVESTMENTS CO | +191,200 | 284,816 | |
| Mega MILLENNIUM MANAGEMENT LLC | +166,778 | 283,280 |
Top Sellers
vs Dec 31, 2025| Institution | Sold | Now Holds | Open |
|---|---|---|---|
| Large MARSHALL WACE, LLP | −47,687 | 15,224 | |
| Mid Advent International, L.P. | −25,400 | 552,377 | |
| Large Qube Research & Technologies Ltd | −17,689 | 15,410 | |
| Micro NANO CAP NEW MILLENNIUM GROWTH FUND L P | −12,500 | 12,500 | |
| Large OMERS ADMINISTRATION Corp | −8,500 | 15,900 |
Top New Positions
vs Dec 31, 2025| Institution | Acquired | Value (USD) | Open |
|---|---|---|---|
| — Longitude Capital Partners II, LLC | 3,529,245 | $8,011,386 | |
| Mega VANGUARD CAPITAL MANAGEMENT LLC | 982,494 | $2,230,261 | |
| Mega VANGUARD FIDUCIARY TRUST CO | 109,712 | $249,046 | |
| Mid XTX Topco Ltd | 61,070 | $138,628 | |
| Mid ALGERT GLOBAL LLC | 23,181 | $52,620 |
Top Sold-Out Positions
vs Dec 31, 2025| Institution | Previously Held | Last Value (USD) | Open |
|---|---|---|---|
| — Endeavour Medtech Growth II LP | 2,257,099 | $6,545,587 | |
| Mega VANGUARD GROUP INC | 978,781 | $2,838,464 | |
| Small Parkman Healthcare Partners LLC | 354,465 | $1,027,948 | |
| Large Schonfeld Strategic Advisors LLC | 352,433 | $1,022,055 | |
| Mega CITADEL ADVISORS LLC | 126,539 | $366,963 |
| Holder | Value (USD) | % of 13F | Shares | Type | Discretion | Filed | Open | |||
|---|---|---|---|---|---|---|---|---|---|---|
| Mid Bain Capital Life Sciences Investors, LLC | $19,146,451 | 43.55% | 8,434,560 | Shares | Sole | 2026-05-15 | ||||
| — Longitude Capital Partners II, LLC | $8,011,386 | 18.22% | 3,529,245 | Shares | Sole | 2026-05-15 | ||||
| Micro ABG-WTT Global Life Science Capital Partners GP Ltd | $4,195,631 | 9.54% | 1,848,296 | Shares | Sole | 2026-05-18 | ||||
| Mega VANGUARD CAPITAL MANAGEMENT LLC | $2,230,261 | 5.07% | 982,494 | Shares | Defined | 2026-05-15 | ||||
| Small ESSEX INVESTMENT MANAGEMENT CO LLC | $2,006,523 | 4.56% | 883,931 | Shares | Sole | 2026-05-11 | ||||
| Mid Advent International, L.P. | $1,253,895 | 2.85% | 552,377 | Shares | Defined | 2026-05-15 | ||||
| Small Evernest Financial Advisors, LLC | $981,797 | 2.23% | 432,510 | Shares | Sole | 2026-05-04 | ||||
| Large SEI INVESTMENTS CO | $646,532 | 1.47% | 284,816 | Shares | Sole | 2026-05-13 | ||||
| Mega MILLENNIUM MANAGEMENT LLC | $643,045 | 1.46% | 283,280 | Shares | Sole | 2026-05-15 | ||||
| Mid Legato Capital Management LLC | $624,077 | 1.42% | 274,924 | Shares | Other | 2026-05-14 | ||||
| Mega GEODE CAPITAL MANAGEMENT, LLC | $561,091 | 1.28% | 247,177 | Shares | Defined | 2026-05-15 | ||||
| Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP | $481,498 | 1.10% | 212,114 | Shares | Other | 2026-05-15 | ||||
| Mega BlackRock, Inc. | $356,915 | 0.81% | 157,232 | Shares | Sole | 2026-05-13 | ||||
| Mega JANE STREET GROUP, LLC | $301,739 | 0.69% | 132,925 | Shares | Defined | 2026-05-12 | ||||
| Large RENAISSANCE TECHNOLOGIES LLC | $287,420 | 0.65% | 126,617 | Shares | Sole | 2026-05-14 | ||||
| Mid 683 Capital Management, LLC | $274,154 | 0.62% | 120,773 | Shares | Defined | 2026-05-15 | ||||
| Mega VANGUARD FIDUCIARY TRUST CO Bank | $249,046 | 0.57% | 109,712 | Shares | Defined | 2026-05-08 | ||||
| Mega STATE STREET CORP | $213,093 | 0.48% | 93,874 | Shares | Defined | 2026-05-15 | ||||
| Mega DIMENSIONAL FUND ADVISORS LP | $198,825 | 0.45% | 87,589 | Shares | Sole | 2026-05-07 | ||||
| Mega GOLDMAN SACHS GROUP INC | $163,240 | 0.37% | 71,912 | Shares | Defined | 2026-05-15 | ||||
| Micro FIFTH LANE CAPITAL, LP | $161,170 | 0.37% | 71,000 | Shares | Sole | 2026-05-15 | ||||
| Mid XTX Topco Ltd | $138,628 | 0.32% | 61,070 | Shares | Defined | 2026-05-15 | ||||
| Mega NORTHERN TRUST CORP Bank | $109,592 | 0.25% | 48,279 | Shares | Defined | 2026-05-14 | ||||
| Mega BANK OF AMERICA CORP /DE/ Bank | $70,401 | 0.16% | 31,014 | Shares | Defined | 2026-05-18 | ||||
| Mega MORGAN STANLEY | $66,299 | 0.15% | 29,207 | Shares | Defined | 2026-05-15 | ||||
| Mid ALGERT GLOBAL LLC | $52,620 | 0.12% | 23,181 | Shares | Sole | 2026-05-14 | ||||
| Large Temasek Holdings (Private) Ltd | $49,526 | 0.11% | 21,818 | Shares | Defined | 2026-05-12 | ||||
| Mega BARCLAYS PLC | $49,020 | 0.11% | 21,595 | Shares | Defined | 2026-05-15 | ||||
| Small Catalyst Funds Management Pty Ltd | $48,124 | 0.11% | 21,200 | Shares | Sole | 2026-05-11 | ||||
| Mid Graham Capital Management, L.P. | $45,400 | 0.10% | 20,000 | Shares | Sole | 2026-05-15 | ||||
| Mega AMERICAN CENTURY COMPANIES INC | $38,412 | 0.09% | 16,922 | Shares | Defined | 2026-05-15 | ||||
| Large OMERS ADMINISTRATION Corp | $36,093 | 0.08% | 15,900 | Shares | Sole | 2026-05-15 | ||||
| Large Qube Research & Technologies Ltd | $34,980 | 0.08% | 15,410 | Shares | Sole | 2026-05-15 | ||||
| Large MARSHALL WACE, LLP | $34,558 | 0.08% | 15,224 | Shares | Other | 2026-05-15 | ||||
| Large OSAIC HOLDINGS, INC. | $31,780 | 0.07% | 14,000 | Shares | Defined | 2026-05-15 | ||||
| Large BANCO BILBAO VIZCAYA ARGENTARIA, S.A. | $28,808 | 0.07% | 12,691 | Shares | Defined | 2026-05-14 | ||||
| Large Hudson Bay Capital Management LP | $28,429 | 0.06% | 12,524 | Shares | Defined | 2026-05-13 | ||||
| Micro NANO CAP NEW MILLENNIUM GROWTH FUND L P | $28,375 | 0.06% | 12,500 | Shares | Sole | 2026-05-15 | ||||
| Mega Vanguard Global Advisers, LLC | $26,400 | 0.06% | 11,630 | Shares | Defined | 2026-05-08 | ||||
| Mega UBS Group AG | $25,541 | 0.06% | 11,252 | Shares | Defined | 2026-05-05 | ||||
| Mega BNP PARIBAS ARBITRAGE, SA | $21,172 | 0.05% | 9,327 | Shares | Defined | 2026-05-12 | ||||
| Mid Larson Financial Group LLC | $12,464 | 0.03% | 5,491 | Shares | Sole | 2026-05-15 | ||||
| Mega ROYAL BANK OF CANADA Bank | $1,632 | 0.00% | 719 | Shares | Defined | 2026-05-15 | ||||
| Small RESOURCES MANAGEMENT CORP /CT/ /ADV | $1,135 | 0.00% | 500 | Shares | Sole | 2026-05-15 | ||||
| Large CWM, LLC | $426 | 0.00% | 188 | Shares | Sole | 2026-05-14 | ||||
| Mega JPMORGAN CHASE & CO | $247 | 0.00% | 109 | Shares | Defined | 2026-05-13 | ||||
| Mid SBI Securities Co., Ltd. Broker-Dealer | $34 | 0.00% | 15 | Shares | Defined | 2026-04-28 | ||||
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