Rapid Micro Biosystems, Inc. (RPID) Insider Trading
Over the last 3 months, RPID insiders made 1 open-market buy and 3 sales, a net sale of -$133K (SEC Form 4). Over the last 6 months, 32 institutions increased and 17 reduced their position (13F).
Insider Activity
Sentiment
7/100
Buys (3m)
1
Sells (3m)
3
Net (3m)
-$132.8K
Insiders buyingFirst buy in 6 quarters
Insider trades by month Buys Sells
Nov
Dec
Jul
Feb
Mar
May
Context3-month price -55%Institutions accumulating (13F)
| Date | Insider | Type | Shares | Price |
|---|---|---|---|---|
| Jun 2, 2026 | PEI MELINDA LITHERLANDdirector | Grant | 12,787 | $1.96 |
| Jun 2, 2026 | Spignesi Robert G. Jr.director, officer: PRESIDENT AND CEO | Grant | 12,787 | $1.96 |
| Jun 2, 2026 | WIRTJES SEAN Mofficer: CHIEF FINANCIAL OFFICER | Grant | 12,787 | $1.96 |
| Jun 2, 2026 | Malloy Kirkdirector | Grant | 12,787 | $1.96 |
| Jun 2, 2026 | LOWENSTEIN INESEdirector | Grant | 12,787 | $1.96 |
| May 26, 2026 | LOWENSTEIN INESEdirector | Grant | 38,700 | $2.07 |
| May 26, 2026 | PEI MELINDA LITHERLANDdirector | Grant | 38,700 | $2.07 |
| May 26, 2026 | Kollender Richard Sdirector | Grant | 19,300 | — |
| May 26, 2026 | Kollender Richard Sdirector | Grant | 38,700 | $2.07 |
| May 26, 2026 | Bika Dafnidirector | Grant | 38,700 | $2.07 |
| May 26, 2026 | Bika Dafnidirector | Grant | 19,300 | — |
| May 26, 2026 | Malloy Kirkdirector | Grant | 19,300 | — |
| May 26, 2026 | Malloy Kirkdirector | Grant | 38,700 | $2.07 |
| May 26, 2026 | LOWENSTEIN INESEdirector | Grant | 19,300 | — |
| May 26, 2026 | PEI MELINDA LITHERLANDdirector | Grant | 19,300 | — |
| May 22, 2026 | Bain Capital Life Sciences Investors, LLC10 percent owner | Buy | 1,463,000 | $0.01 |
| Mar 12, 2026 | WIRTJES SEAN Mofficer: CHIEF FINANCIAL OFFICER | Sell | 7,480 | $4.32 |
| Mar 12, 2026 | Spignesi Robert G. Jr.director, officer: PRESIDENT AND CEO | Sell | 17,922 | $4.11 |
| Mar 12, 2026 | Wilson John J. Addingtonofficer: CHIEF OPERATING OFFICER | Sell | 9,603 | $4.32 |
| Mar 2, 2026 | RICCIARDI NATALE Sdirector | Option | 842 | $0.75 |
| Feb 20, 2026 | Spignesi Robert G. Jr.director, officer: PRESIDENT AND CEO | Sell | 38,327 | $3.89 |
| Feb 20, 2026 | Wilson John J. Addingtonofficer: CHIEF OPERATING OFFICER | Sell | 5,403 | $3.92 |
| Feb 20, 2026 | WIRTJES SEAN Mofficer: CHIEF FINANCIAL OFFICER | Sell | 17,254 | $3.92 |
| Feb 13, 2026 | Spignesi Robert G. Jr.director, officer: PRESIDENT AND CEO | Grant | 528,000 | $4.20 |
| Feb 13, 2026 | WIRTJES SEAN Mofficer: CHIEF FINANCIAL OFFICER | Grant | 193,000 | $4.20 |
| Feb 13, 2026 | WIRTJES SEAN Mofficer: CHIEF FINANCIAL OFFICER | Grant | 97,000 | — |
| Feb 13, 2026 | Wilson John J. Addingtonofficer: CHIEF OPERATING OFFICER | Grant | 147,000 | $4.20 |
| Feb 13, 2026 | Wilson John J. Addingtonofficer: CHIEF OPERATING OFFICER | Grant | 74,000 | — |
| Feb 13, 2026 | Spignesi Robert G. Jr.director, officer: PRESIDENT AND CEO | Grant | 264,000 | — |
| Feb 10, 2026 | WIRTJES SEAN Mofficer: CHIEF FINANCIAL OFFICER | Sell | 6,027 | $3.78 |
Source: RPID SEC Form 4 filings, latest Jun 2, 2026. For informational purposes only — not investment advice.
Institutional activity (13F)
How institutions changed their RPID positions over the last 6 months (SEC Form 13F).
Increased
32
New positions
25
Reduced
17
Sold out
10
Largest moves
| Institution | Action | Shares | Filed |
|---|---|---|---|
| BAIN CAPITAL LIFE SCIENCES INVESTORS, LLC | Unchanged | 8.4M | Feb 17, 2026 |
| BAIN CAPITAL LIFE SCIENCES INVESTORS, LLC | Unchanged | 8.4M | May 15, 2026 |
| ABG-WTT GLOBAL LIFE SCIENCE CAPITAL PARTNERS GP LTD | Unchanged | 1.8M | Feb 17, 2026 |
| ABG-WTT GLOBAL LIFE SCIENCE CAPITAL PARTNERS GP LTD | Unchanged | 1.8M | May 18, 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC | New Position | 982K | May 15, 2026 |
| VANGUARD GROUP INC | Increased | 979K | Jan 29, 2026 |
| ESSEX INVESTMENT MANAGEMENT CO LLC | Increased | 884K | May 11, 2026 |
| ADVENT INTERNATIONAL CORP/MA | Unchanged | 578K | Feb 17, 2026 |
| ADVENT INTERNATIONAL CORP/MA | Reduced | 552K | May 15, 2026 |
| EVERNEST FINANCIAL ADVISORS, LLC | Increased | 433K | May 4, 2026 |
| PARKMAN HEALTHCARE PARTNERS LLC | Reduced | 354K | Feb 17, 2026 |
| SCHONFELD STRATEGIC ADVISORS LLC | Reduced | 352K | Feb 17, 2026 |
| SEI INVESTMENTS CO | Increased | 285K | May 13, 2026 |
| MILLENNIUM MANAGEMENT LLC | Increased | 283K | May 15, 2026 |
| LEGATO CAPITAL MANAGEMENT LLC | Increased | 275K | May 14, 2026 |
Source: SEC Form 13F filings. For informational purposes only — not investment advice.