RAPID MICRO BIOSYSTEMS, INC.
Total Trades
22
Buys
10
Sells
10
Largest Trade
N/A
Insiders
7
Institutional Funds
31
Inst. Value
$1M+
Activist Filings
19
Insider Trades
| Insider | Title | Type | Value | Shares | Price | Date |
|---|---|---|---|---|---|---|
| Wilson John J. Addington | CHIEF OPERATING OF… | SELL | $15K–$50K | 5K | $3.92 | Feb 21, 2026 |
| WIRTJES SEAN M | CHIEF FINANCIAL OF… | SELL | $50K–$100K | 17K | $3.92 | Feb 21, 2026 |
| Spignesi Robert G. Jr. | PRESIDENT AND CEO | SELL | $100K–$500K | 38K | $3.89 | Feb 21, 2026 |
| Wilson John J. Addington | CHIEF OPERATING OF… | SELL | $15K–$50K | 5K | $3.78 | Feb 10, 2026 |
| WIRTJES SEAN M | CHIEF FINANCIAL OF… | SELL | $15K–$50K | 6K | $3.78 | Feb 10, 2026 |
| Spignesi Robert G. Jr. | PRESIDENT AND CEO | SELL | $15K–$50K | 13K | $3.78 | Feb 10, 2026 |
| Longitude Capital Partners II, LLC | 10% Owner | SELL | $100K–$500K | 49K | $3.88 | Feb 6, 2026 |
| Longitude Capital Partners II, LLC | 10% Owner | SELL | $100K–$500K | 109K | $4.36 | Feb 4, 2026 |
| Spignesi Robert G. Jr. | PRESIDENT AND CEO | EXERCISE | N/A | 50K | — | Jul 15, 2025 |
| Spignesi Robert G. Jr. | PRESIDENT AND CEO | SELL | $50K–$100K | 24K | $3.32 | Jul 15, 2025 |
| Spignesi Robert G. Jr. | PRESIDENT AND CEO | EXERCISE | N/A | 75K | — | Jul 10, 2025 |
| Spignesi Robert G. Jr. | PRESIDENT AND CEO | SELL | $100K–$500K | 34K | $3.47 | Jul 10, 2025 |
| PEI MELINDA LITHERLAND | Director | BUY | $15K–$50K | 20K | $1.05 | Nov 28, 2024 |
| WIRTJES SEAN M | CHIEF FINANCIAL OF… | BUY | $1K–$15K | 10K | $0.99 | Sep 8, 2023 |
| Spignesi Robert G. Jr. | PRESIDENT AND CEO | BUY | $15K–$50K | 20K | $0.97 | Aug 16, 2023 |
| Spignesi Robert G. Jr. | PRESIDENT AND CEO | BUY | $15K–$50K | 34K | $0.92 | Aug 10, 2023 |
| Spignesi Robert G. Jr. | PRESIDENT AND CEO | BUY | $15K–$50K | 20K | $0.91 | May 18, 2023 |
| KENNEDY LEWIS MANAGEMENT LP | 10% Owner | BUY | $100K–$500K | 69K | $4.87 | Jun 2, 2022 |
| KENNEDY LEWIS MANAGEMENT LP | 10% Owner | BUY | $100K–$500K | 50K | $4.59 | May 27, 2022 |
| KENNEDY LEWIS MANAGEMENT LP | 10% Owner | BUY | $100K–$500K | 97K | $4.08 | May 19, 2022 |
| Spignesi Robert G. Jr. | President and CEO | BUY | $15K–$50K | 10K | $3.79 | May 18, 2022 |
| LOWENSTEIN INESE | Director | BUY | $50K–$100K | 10K | $6.95 | Mar 14, 2022 |
Institutional Ownership
13F filings as of Dec 31, 2025 · 31 funds holding
| Fund | Shares | Value | Type |
|---|---|---|---|
| Bain Capital Life Sciences Investors, LLC | 8.4M | $1M+ | SH |
| ABG-WTT Global Life Science Capital Partners GP Ltd | 1.8M | $1M+ | SH |
| VANGUARD GROUP INC | 857K | $1M+ | SH |
| ADVENT INTERNATIONAL, L.P. | 578K | $1M+ | SH |
| Schonfeld Strategic Advisors LLC | 352K | $1M+ | SH |
| GEODE CAPITAL MANAGEMENT, LLC | 179K | $500K+ | SH |
| Evernest Financial Advisors, LLC | 125K | $100K–$500K | SH |
| RENAISSANCE TECHNOLOGIES LLC | 116K | $100K–$500K | SH |
| SEI INVESTMENTS CO | 94K | $100K–$500K | SH |
| STATE STREET CORP | 91K | $100K–$500K | SH |
| Informed Momentum Co LLC | 77K | $100K–$500K | SH |
| ESSEX INVESTMENT MANAGEMENT CO LLC | 62K | $100K–$500K | SH |
| GOLDMAN SACHS GROUP INC | 55K | $100K–$500K | SH |
| JANE STREET GROUP, LLC | 50K | $100K–$500K | SH |
| DIMENSIONAL FUND ADVISORS LP | 35K | $100K–$500K | SH |
| Point72 Asset Management, L.P. | 30K | $50K–$100K | SH |
| NANO CAP NEW MILLENNIUM GROWTH FUND L P | 25K | $50K–$100K | SH |
| BARCLAYS PLC | 25K | $50K–$100K | SH |
| OMERS ADMINISTRATION Corp | 24K | $50K–$100K | SH |
| MORGAN STANLEY | 21K | $50K–$100K | SH |
Activist & 5%+ Owners
SC 13D/13G filings — investors holding 5%+ of outstanding shares
Endeavour Medtech Growth II LP
SC 13G/A · Feb 13, 2026
5.7%
2.3M shares
SC 13D · Aug 19, 2025
6.3%
2.6M shares
T. Rowe Price Investment Management, Inc. 85-4328500
SC 13G/A · Feb 14, 2024
0.0%
0 shares
Endeavour Medtech Growth II LP
SC 13G/A · Jan 22, 2024
6.0%
2.3M shares
Longitude Capital Partners II, LLC
SC 13G/A · Feb 14, 2023
10.9%
4.0M shares
T. Rowe Price Investment Management, Inc. 85-4328500
SC 13G · Feb 14, 2023
6.0%
2.2M shares
T. ROWE PRICE ASSOCIATES, INC. 52-0556948
SC 13G/A · Feb 14, 2023
2.2%
801K shares
SC 13G/A · Feb 14, 2023
0.0%
0 shares
JPMORGAN CHASE & CO. 13-2624428
SC 13G/A · Nov 7, 2022
3.8%
1.4M shares
SC 13D/A · Aug 29, 2022
14.1%
5.2M shares
SC 13D · Jun 30, 2022
14.1%
5.2M shares
SC 13G/A · May 19, 2022
13.7%
5.0M shares
SC 13G · Mar 16, 2022
5.1%
1.8M shares
Longitude Capital Partners II, LLC
SC 13G · Feb 14, 2022
11.7%
4.0M shares
T. ROWE PRICE ASSOCIATES, INC. 52-0556948
SC 13G · Feb 14, 2022
6.3%
2.2M shares
SC 13G · Feb 14, 2022
7.7%
2.6M shares
Bain Capital Life Sciences Fund, L.P.
SC 13G · Feb 14, 2022
22.2%
7.7M shares
SC 13G · Feb 11, 2022
6.1%
2.1M shares
JPMORGAN CHASE & CO. 13-2624428
SC 13G · Jan 26, 2022
5.1%
1.8M shares