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Equibles

RPID

Rapid Micro Biosystems, Inc.

Company with tickers: RPID

CIK
1380106
CUSIP
75340L104
Shares Outstanding
45,322,280
13F Activity (30d)
44 filings 42 filers

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: 46
Total Value: $35,956,499
Total Shares: 15,839,879

Institutional Ownership Trend

19 quarters

Holder Concentration

Across 46 13F filers · Δ vs Dec 31, 2025
Top Holder
53.2%
Jun 2023 → Mar 2026 · range 38.6% – 70.6%
−4.4 pts
Top 5
80.2%
Jun 2023 → Mar 2026 · range 78.5% – 94.9%
−3.2 pts
Top 10
89.8%
Jun 2023 → Mar 2026 · range 89.8% – 99.3%
−0.6 pts
HHI
3,079
Jun 2023 → Mar 2026 · range 2,172 – 5,145
Highly concentrated −492

Quarterly Activity

vs Dec 31, 2025
New
13
Increased
17
Decreased
9
Sold Out
9
Unchanged
7
Holder count: +4
Institutional value: -15.2%
Shares held: +8.3%

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
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
Large Temasek Holdings (Private) Ltd 21,818 $49,526

Top Sold-Out Positions

vs Dec 31, 2025
Institution Previously Held Last Value (USD) Open
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
Small Informed Momentum Co LLC 77,182 $223,827
Filter: New 13 Increased 17 Reduced 9 Sold out 9 Unchanged 7
Showing 46 of 46
All Common Calls Puts
Export CSV
Holder Value (USD) % of 13F Shares Open
Mid Bain Capital Life Sciences Investors, LLC $19,146,451 53.25% 8,434,560
Micro ABG-WTT Global Life Science Capital Partners GP Ltd $4,195,631 11.67% 1,848,296
Mega VANGUARD CAPITAL MANAGEMENT LLC $2,230,261 6.20% 982,494
Small ESSEX INVESTMENT MANAGEMENT CO LLC $2,006,523 5.58% 883,931
Mid Advent International, L.P. $1,253,895 3.49% 552,377
Small Evernest Financial Advisors, LLC $981,797 2.73% 432,510
Large SEI INVESTMENTS CO $646,532 1.80% 284,816
Mega MILLENNIUM MANAGEMENT LLC $643,045 1.79% 283,280
Mid Legato Capital Management LLC $624,077 1.74% 274,924
Mega GEODE CAPITAL MANAGEMENT, LLC $561,091 1.56% 247,177
Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP $481,498 1.34% 212,114
Mega BlackRock, Inc. $356,915 0.99% 157,232
Mega JANE STREET GROUP, LLC $301,739 0.84% 132,925
Large RENAISSANCE TECHNOLOGIES LLC $287,420 0.80% 126,617
Mid 683 Capital Management, LLC $274,154 0.76% 120,773
Mega VANGUARD FIDUCIARY TRUST CO Bank $249,046 0.69% 109,712
Mega STATE STREET CORP $213,093 0.59% 93,874
Mega DIMENSIONAL FUND ADVISORS LP $198,825 0.55% 87,589
Mega GOLDMAN SACHS GROUP INC $163,240 0.45% 71,912
Micro FIFTH LANE CAPITAL, LP $161,170 0.45% 71,000
Mid XTX Topco Ltd $138,628 0.39% 61,070
Mega NORTHERN TRUST CORP Bank $109,592 0.30% 48,279
Mega BANK OF AMERICA CORP /DE/ Bank $70,401 0.20% 31,014
Mega MORGAN STANLEY $66,299 0.18% 29,207
Mid ALGERT GLOBAL LLC $52,620 0.15% 23,181
Large Temasek Holdings (Private) Ltd $49,526 0.14% 21,818
Mega BARCLAYS PLC $49,020 0.14% 21,595
Small Catalyst Funds Management Pty Ltd $48,124 0.13% 21,200
Mid Graham Capital Management, L.P. $45,400 0.13% 20,000
Mega AMERICAN CENTURY COMPANIES INC $38,412 0.11% 16,922
Large OMERS ADMINISTRATION Corp $36,093 0.10% 15,900
Large Qube Research & Technologies Ltd $34,980 0.10% 15,410
Large MARSHALL WACE, LLP $34,558 0.10% 15,224
Large OSAIC HOLDINGS, INC. $31,780 0.09% 14,000
Large BANCO BILBAO VIZCAYA ARGENTARIA, S.A. $28,808 0.08% 12,691
Large Hudson Bay Capital Management LP $28,429 0.08% 12,524
Micro NANO CAP NEW MILLENNIUM GROWTH FUND L P $28,375 0.08% 12,500
Mega Vanguard Global Advisers, LLC $26,400 0.07% 11,630
Mega UBS Group AG $25,541 0.07% 11,252
Mega BNP PARIBAS ARBITRAGE, SA $21,172 0.06% 9,327
Mid Larson Financial Group LLC $12,464 0.03% 5,491
Mega ROYAL BANK OF CANADA Bank $1,632 0.00% 719
Small RESOURCES MANAGEMENT CORP /CT/ /ADV $1,135 0.00% 500
Large CWM, LLC $426 0.00% 188
Mega JPMORGAN CHASE & CO $247 0.00% 109
Mid SBI Securities Co., Ltd. Broker-Dealer $34 0.00% 15

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