Rapid Micro Biosystems
RPID · NASDAQ
$0.7717+$0.0068 (+0.89%)TodayMarket closed ·
Prev close $0.7649
Who owns RPID
Largest institutional holders, from their latest 13F filings
The 10 largest institutions hold 46.7% of RPID’s shares.
- Bain Capital Life Sciences Investors, LLC17.1%
- Longitude Capital Management Co., LLC7.1%
- Armistice Capital LLC6.7%
- Endeavour Medtech Growth II LP4.6%
- Next 6 largest institutions11.2%
- All other shareholders53.3%
| Holder | Shares | % of shares |
|---|---|---|
| Bain Capital Life Sciences Investors, LLC | 8.43M | 17.07% |
| Longitude Capital Management Co., LLC | 3.53M | 7.14% |
| Armistice Capital LLC | 3.33M | 6.73% |
| Endeavour Medtech Growth II LP | 2.26M | 4.57% |
| Ally Bridge Group (HK) Limited | 1.85M | 3.74% |
| Spignesi (Robert G JR) | 1.45M | 2.93% |
| Vanguard Capital Management, LLC | 982.03K | 1.99% |
| Evernest Financial Advisors, LLC | 506.00K | 1.02% |
| Advent International L.P. | 379.79K | 0.77% |
| Essex Investment Management Company, LLC | 362.70K | 0.73% |
Largest mutual fund holders
| Holder | Shares | % of shares |
|---|---|---|
| Vanguard Total Stock Market Index Fund | 750.98K | 1.52% |
| Vanguard Extended Market Index Fund | 202.76K | 0.41% |
| iShares Micro-Cap ETF | 113.60K | 0.23% |
| Fidelity Extended Market Index Fund | 103.38K | 0.21% |
| DFA U.S. Micro Cap Portfolio | 31.71K | 0.06% |
Insider trades
Form 4 filings by officers, directors and large holders
Insiders made no open-market buys or sales of RPID in the last 6 months.
| Insider | Type | Shares | Value |
|---|---|---|---|
| Kollender Richard S | Option exercise | 1.83K | — |
| Kollender Richard S | Option exercise | 1.68K | — |
| Kollender Richard S | Option exercise | 1.83K | $1.37K |
| Kollender Richard S | Option exercise | 1.68K | $1.26K |
| Spignesi Robert G. Jr. | Option exercise | 1.40K | — |
| Spignesi Robert G. Jr. | Option exercise | 1.40K | $1.05K |
| LOWENSTEIN INESE | Award | 12.79K | — |
| LOWENSTEIN INESE | Award | 12.79K | — |
| LOWENSTEIN INESE | Award | 12.79K | $25.00K |
| Spignesi Robert G. Jr. | Award | 12.79K | — |
Short interest
Settled Sep 30, 2026
- Shares short
- 853.97K
- Days to cover
- 2.28
- % of shares outstanding
- 1.73%
- Average daily volume
- 374.93K
- Change since last report
- −9.2%
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