RPID

RAPID MICRO BIOSYSTEMS INC

RPID·75340L104·US·Common Stock·Healthcare - Medical Devices-Activist

CLASS A COM

RPID (RAPID MICRO BIOSYSTEMS INC) is held by 30 institutional investors as of Q1 2026. Largest holders: VANGUARD CAPITAL MANAGEMENT LLC ($2.2M), SEI INVESTMENTS CO ($646,532), MILLENNIUM MANAGEMENT LLC ($643,046). Net institutional sentiment: Mixed.

30
Holders
(1 Elite)
$7.1M
Total Value
66% (32)
Consensus
21 buying - 11 selling
13F: Insider & Congress:
RPID

Smart Money Verdict

View all
Held by 30 funds
1 elite

Who's Trading

ActivistLILongitude Capital Partners II, LLC8.6%May 15, 2026
InsiderWMWIRTJES SEAN MSell $32KMar 11, 2026
InsiderWAWilson John J. AddingtonSell $41KMar 11, 2026
InsiderSJSpignesi Robert G. Jr.Sell $74KMar 10, 2026
InsiderWMWIRTJES SEAN MSell $68KFeb 20, 2026
InsiderWAWilson John J. AddingtonSell $21KFeb 20, 2026
InsiderSJSpignesi Robert G. Jr.Sell $149KFeb 19, 2026
ActivistEMEndeavour Medtech Growth II LP5.7%Feb 13, 2026
ActivistSRSPIGNESI ROBERT G JR6.3%Aug 19, 2025
InsiderSJSpignesi Robert G. Jr.Sell $39KJul 14, 2025

Top Holders

Fund
Action
Shares
Value
Weight
Est. P&L
Conviction
New
982,494$2.2M0.0%-59.20%
36
Increased
284,816(+204.2%)$646,5320.0%-53.87%
39
Increased
283,280(+143.2%)$643,0460.0%-52.30%
39
Increased
247,177(+13.6%)$561,3310.0%-69.03%
19
Increased
212,114(+23.1%)$481,4990.0%-42.90%
29
Increased
157,232(+0.4%)$356,9160.0%+52.38%
16
Increased
132,925(+26.2%)$301,7390.0%-46.23%
20
Increased
126,617(+9.5%)$287,4210.0%+36.40%
26
New
109,712$249,0460.0%-59.20%
32
Increased
93,874(+2.6%)$213,0940.0%-27.61%
16
Increased
87,589(+55.9%)$198,6790.0%-51.20%
22
Increased
71,912(+30.0%)$163,2400.0%-44.09%
19
New
61,070$138,6290.0%-59.20%
31
Increased
48,279(+19.3%)$109,5930.0%-70.12%
18
Increased
31,014(+139.9%)$70,4020.0%-52.19%
23
Decreased
29,207(-7.0%)$66,3000.0%-33.62%
0
New
21,818$49,5270.0%-59.20%
28
Decreased
21,595(-13.1%)$49,0200.0%-37.09%
0
Unchanged
16,922$38,4130.0%-41.63%
0
Decreased
15,900(-34.8%)$36,0930.0%-37.09%
0

Showing 1-20 of 34

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Data sourced from four public-disclosure sources: SEC 13F, Form 4, 13D/13G, and House/Senate STOCK Act disclosures. Not financial advice. Full disclaimer

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