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Every notice on Red Flags →A Form 144 is notice of a planned sale, not the sale itself. What insiders actually sold is on Insider Transactions.
| Holder | Shares | % of company | Change vs last qtr | 8 quarters | Held since | % of their book |
|---|---|---|---|---|---|---|
|
BC
Bain Capital Life Sciences Investors, LLC
|
8.4M | 17.45% | Unchanged | 2021 | 0.9% | |
|
Shares held by quarter
Peak holding8.4M (Q3'24)
Change over 8 quarters0
Share of the company17.450%
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|
AC
Armistice Capital, LLC
|
3.3M | 6.88% | NEW | Q2 '26 | 0.1% | |
|
Shares held by quarter
Peak holding3.3M (Q2'26)
Change over 8 quarters+3.3M
Share of the company6.880%
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28 more super investors behind a free account
See every manager holding Rapid Micro Biosystems, Inc., how their position has changed, and how long they've held it.
Sign up free| Fund | Position value | Shares | % of company | % of the fund | As of |
|---|---|---|---|---|---|
|
VT
Vanguard Index Funds
|
$1.3M | 751.0K | 1.55% | 0.00% | June 30, 2026 |
|
1E
1290 Funds
|
$492K | 205.1K | 0.42% | 0.44% | April 30, 2026 |
19 more funds behind a free account
See every fund holding Rapid Micro Biosystems, Inc. and how much of the fund the position is.
Sign up free| Holder | Shares | % of company | Change vs last qtr | 8 quarters | Held since | % of their book |
|---|---|---|---|---|---|---|
|
SR
Spignesi Robert G JR
5%+ holder
13D · 6.3%
|
2.6M | 5.48% | — | — |
— | — |
|
This holder reports through Schedule 13D/G, not a quarterly 13F.
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