13F Insight
DOSSIER · 13F Holders · Q1 2026High-convictionMulti-bagger
RPID

RAPID MICRO BIOSYSTEMS INC

47 institutions still hold RAPID MICRO BIOSYSTEMS INC as of Q1 2026. Tracked across SEC 13F-HR filings, with insider and 13D/G activity surfaced alongside.

CUSIP 75340L104·47 13F holders·last filed Mar 31, 2026
Market cap
—
▼ 3.4%
vs prior quarter
13F value held
$35M
69.0% inst. owned
of float
Holders
47
+92 QoQ
filers reporting
Activity
+91 / −77
+955 added · −733 reduced
this quarter
Concentration
54.93%
Bain Capital Life Sciences Investors, LLC #1
top holder share
AI Holders Summary · Q1 2026

47 institutions reported RPID in Q1 2026. Bain Capital Life Sciences Investors, LLC leads at 54.9% of the visible book. +92 net new institutions vs prior quarter — accumulation reading.

Top holders

Sorted by position value. Source: SEC EDGAR 13F-HR filings.

#HolderValueShares% port.Quarter
01
Bain Capital Life Sciences Investors, LLC
CIK 0001703031
$19M8.4M1.73%Q1 202602
ABG-WTT Global Life Science Capital Partners GP Ltd
CIK 0001832108
$4M1.8M34.13%Q1 202603
VANGUARD CAPITAL MANAGEMENT LLC
CIK 0002100119· Index
$2M982K0.00%Q1 202604
ESSEX INVESTMENT MANAGEMENT CO LLC
CIK 0000201772
$2M884K0.32%Q1 202605
ADVENT INTERNATIONAL, L.P.
CIK 0001034196
$1M552K0.03%Q1 202606
Evernest Financial Advisors, LLC
CIK 0002009530
$1M433K0.21%Q1 202607
SEI INVESTMENTS CO
CIK 0000350894
$646,532285K0.00%Q1 202608
MILLENNIUM MANAGEMENT LLC
CIK 0001273087
$643,046283K0.00%Q1 202609
GEODE CAPITAL MANAGEMENT, LLC
CIK 0001214717· Index
$561,331247K0.00%Q1 202610
SUSQUEHANNA INTERNATIONAL GROUP, LLP
CIK 0001446194· Market maker
$481,499212K0.00%Q1 202611
CITADEL ADVISORS LLC
CIK 0001423053
$366,963127K0.00%Q4 202512
BlackRock, Inc.
CIK 0002012383
$356,916157K0.00%Q1 202613
683 Capital Management, LLC
CIK 0001404574
$350,242121K0.02%Q4 202514
JANE STREET GROUP, LLC
CIK 0001595888· Market maker
$301,739133K0.00%Q1 202615
RENAISSANCE TECHNOLOGIES LLC
CIK 0001037389
$287,421127K0.00%Q1 202616
VANGUARD FIDUCIARY TRUST CO
CIK 0000933478· Index
$249,046110K0.00%Q1 202617
STATE STREET CORP
CIK 0000093751
$213,09494K0.00%Q1 202618
DIMENSIONAL FUND ADVISORS LP
CIK 0000354204· Quasi-passive
$198,67988K0.00%Q1 202619
MARSHALL WACE, LLP
CIK 0001318757
$182,44363K0.00%Q4 202520
GOLDMAN SACHS GROUP INC
CIK 0000886982
$163,24072K0.00%Q1 2026
Page 1 of 3
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