RPID (Rapid Micro Biosystems, Inc. Class A Common Stock)

Insider Trading Activity

Every open-market purchase and sale reported by RPID officers, directors and 10%+ beneficial owners on SEC Form 4, which must be filed within two business days of the transaction. Sales often reflect scheduled 10b5-1 plans or tax withholding rather than a directional view, so read counts alongside the size and the filer.

Market data may be delayed, incomplete, or inaccurate. Not a recommendation to buy, sell, or hold any security. Verify quotes with your broker before trading. See Terms §17.

Form 4 Filings
50
most recent
Open-Market Buys
1
code P
Sales
10
code S
Reporting Insiders
22
current holders
RPID — Recent Form 4 Transactions (latest 2026-07-24)
FiledInsiderRole TypeSharesValue
2026-07-24 Robert G. Spignesi Jr. PRESIDENT AND CEO M
2026-07-24 Richard S Kollender Director M
2026-06-02 Kirk Malloy Director A
2026-06-02 SEAN M WIRTJES CHIEF FINANCIAL OFFICER A
2026-06-02 MELINDA LITHERLAND PEI Director A
2026-06-02 INESE LOWENSTEIN Director A
2026-06-02 Robert G. Spignesi Jr. PRESIDENT AND CEO A
2026-05-26 Dafni Bika Director A
2026-05-26 Kirk Malloy Director A
2026-05-26 Richard S Kollender Director A
2026-05-26 INESE LOWENSTEIN Director A
2026-05-26 MELINDA LITHERLAND PEI Director A
2026-05-22 Bain Capital Life Sciences Partners, LP 10%+ Owner Buy
2026-03-12 SEAN M WIRTJES CHIEF FINANCIAL OFFICER Sell
2026-03-12 Robert G. Spignesi Jr. PRESIDENT AND CEO Sell
2026-03-12 John J. Addington Wilson CHIEF OPERATING OFFICER Sell
2026-03-02 NATALE S RICCIARDI Director M
2026-02-20 SEAN M WIRTJES CHIEF FINANCIAL OFFICER Sell
2026-02-20 Robert G. Spignesi Jr. PRESIDENT AND CEO Sell
2026-02-20 John J. Addington Wilson CHIEF OPERATING OFFICER Sell
2026-02-13 SEAN M WIRTJES CHIEF FINANCIAL OFFICER A
2026-02-13 Robert G. Spignesi Jr. PRESIDENT AND CEO A
2026-02-13 John J. Addington Wilson CHIEF OPERATING OFFICER A
2026-02-10 Robert G. Spignesi Jr. PRESIDENT AND CEO Sell
2026-02-10 John J. Addington Wilson CHIEF OPERATING OFFICER Sell
2026-02-10 SEAN M WIRTJES CHIEF FINANCIAL OFFICER Sell
2026-02-06 Longitude Capital Partners II, LLC 10%+ Owner Sell
2026-02-03 Longitude Capital Partners II, LLC 10%+ Owner MIXED
2025-11-18 Kirk Malloy Director G
2025-10-21 Robert G. Spignesi Jr. PRESIDENT AND CEO MIXED
2025-07-15 Robert G. Spignesi Jr. PRESIDENT AND CEO MIXED
2025-07-10 Robert G. Spignesi Jr. PRESIDENT AND CEO MIXED
2025-05-27 Richard S Kollender Director A
2025-05-27 Kirk Malloy Director A
2025-05-27 NATALE S RICCIARDI Director A
2025-05-27 MELINDA LITHERLAND PEI Director A
2025-05-27 INESE LOWENSTEIN Director A
2025-05-27 Dafni Bika Director A
2025-03-11 Robert G. Spignesi Jr. PRESIDENT AND CEO F
2025-03-11 SEAN M WIRTJES CHIEF FINANCIAL OFFICER F
2025-03-11 John J. Addington Wilson CHIEF OPERATING OFFICER F
2025-02-20 Robert G. Spignesi Jr. PRESIDENT AND CEO A
2025-02-20 John J. Addington Wilson CHIEF OPERATING OFFICER A
2025-02-20 SEAN M WIRTJES CHIEF FINANCIAL OFFICER A
2025-02-13 SEAN M WIRTJES CHIEF FINANCIAL OFFICER F
2025-02-13 John J. Addington Wilson CHIEF OPERATING OFFICER F
2025-02-13 Robert G. Spignesi Jr. PRESIDENT AND CEO F
2025-02-07 SEAN M WIRTJES CHIEF FINANCIAL OFFICER F
2025-02-07 Robert G. Spignesi Jr. PRESIDENT AND CEO F
2025-02-07 John J. Addington Wilson CHIEF OPERATING OFFICER F
RPID — Current Insider Holders
InsiderRole Shares HeldValue
Director 8,448,860
10%+ Owner 8,434,560
10%+ Owner 8,334,560
10%+ Owner 4,029,245
Director 3,422,252
10%+ Owner 2,875,092
10%+ Owner 2,783,606
10%+ Owner 1,991,263
Director 1,614,835
PRESIDENT AND CEO 1,191,973
CHIEF FINANCIAL OFFICER 568,981
CHIEF OPERATING OFFICER 316,762
10%+ Owner 294,990
10%+ Owner 150,000
SVP, GENERAL COUNSEL 128,698
CHIEF HUMAN RESOURCES OFFICER 112,608
Director 100,687
Director 70,687
Director 70,687
CHIEF COMMERCIAL OFFICER 43,750
Director 29,442
Director 19,300
How to read Form 4 activity

Form 4 reports a change in beneficial ownership by an officer, director or 10%+ holder, and must be filed within two business days of the transaction — so this is close to real time, unlike the 45-day-lagged 13F institutional data.

Transaction codes matter more than the raw buy/sell count. Code P is an open-market purchase — an insider choosing to buy with their own money, which is the signal most research treats as informative. Code S is a sale, but sales are frequently pre-scheduled under a 10b5-1 plan or cover tax withholding on vesting equity, so a run of sales often says nothing directional. Codes A and M are grants and option exercises rather than open-market decisions.

Full filing history and per-insider positions are on the RPID quote page; the site-wide leaderboard is on the insider transactions hub.