Rapid Micro Biosystems, Inc. (RPID) Insider Ownership

Historic Insider Ownership Trends

As of June 18, 2026, the three largest insider holders of RPID are Capital Life Sciences Investors, Llc Bain (TenPercentOwner, 8.43Mn shares), Capital Partners Ii, Llc Longitude (TenPercentOwner, 4.03Mn shares), David Hirsch (Director, 3.41Mn shares).

Top Direct Holders

Insider ownership data is derived from the last 60 months of Form 4 SEC filings.
Holder Position Shares (Direct) Shares (Indirect) Report Date
Natale S Ricciardi - 29,442 0 02 Mar, 2026
Sean M Wirtjes Chief Financial Officer 556,194 0 12 Mar, 2026
Kirk Malloy - 28,600 0 18 Nov, 2025
Richard S Kollender - 0 1,481,009 13 Sep, 2021
Victoria Vezina Chief Human Resources Officer 112,608 0 12 Mar, 2024
David Hirsch - 0 3,407,952 20 Jul, 2021
Capital Partners Ii, Llc Longitude - 0 4,029,245 06 Feb, 2026
Gurinder Grewal - 294,990 0 20 Jul, 2021
Capital Life Sciences Investors, Llc Bain - 0 8,434,560 21 Jul, 2021
Melinda Litherland Pei - 68,600 0 27 May, 2025
Lewis Management Lp Kennedy - 0 2,904,490 06 Jun, 2022
Robert G. Jr. Spignesi President And Ceo 1,169,848 0 12 Mar, 2026
Jonathan Paris Svp, General Counsel 128,698 0 13 Mar, 2023
John J. Addington Wilson Chief Operating Officer 316,762 0 12 Mar, 2026
Richard A Keys Chief Commercial Officer 43,750 0 15 Feb, 2022
Inese Lowenstein - 38,600 0 27 May, 2025

* Please note that the shares above only reflect shares from the fund portfolio and the institutional portfolio. Shares from the personal portfolio are excluded from this Institutional Ownership Page. See these insiders' latest transactions here on Insider Page.

Recent Insider Transactions

Detailed insider trading activity based on Form 4 SEC filings.
Download Data
Transaction Date Insider Name Security Class Transaction Type Shares Traded Price Shares Remaining Ownership Code
11 Mar, 2026 John J. Addington Wilson Class A Common Stock D 9,603 $4.32 316,762 D S
10 Mar, 2026 Robert G. Jr. Spignesi Class A Common Stock D 17,922 $4.11 1,169,848 D S
10 Mar, 2026 Robert G. Jr. Spignesi Class A Common Stock D 17,922 $4.11 1,169,848 D S
11 Mar, 2026 Sean M Wirtjes Class A Common Stock D 7,480 $4.32 556,194 D S
11 Mar, 2026 Sean M Wirtjes Class A Common Stock D 7,480 $4.32 556,194 D S
11 Mar, 2026 John J. Addington Wilson Class A Common Stock D 9,603 $4.32 316,762 D S
27 Feb, 2026 Natale S Ricciardi Class A Common Stock A 842 $0.75 29,442 D M
27 Feb, 2026 Natale S Ricciardi Class A Common Stock A 842 $0.75 29,442 D M
27 Feb, 2026 Natale S Ricciardi Stock Option (Right to Buy) D 842 $0.75 0 D M
27 Feb, 2026 Natale S Ricciardi Stock Option (Right to Buy) D 842 $0.75 0 D M
20 Feb, 2026 Sean M Wirtjes Class A Common Stock D 17,254 $3.92 563,674 D S
20 Feb, 2026 Sean M Wirtjes Class A Common Stock D 17,254 $3.92 563,674 D S
19 Feb, 2026 Robert G. Jr. Spignesi Class A Common Stock D 38,327 $3.89 1,187,770 D S
20 Feb, 2026 John J. Addington Wilson Class A Common Stock D 5,403 $3.92 326,365 D S
19 Feb, 2026 Robert G. Jr. Spignesi Class A Common Stock D 38,327 $3.89 1,187,770 D S
20 Feb, 2026 John J. Addington Wilson Class A Common Stock D 5,403 $3.92 326,365 D S
11 Feb, 2026 John J. Addington Wilson Class A Common Stock A 74,000 $0.00 331,768 D A
11 Feb, 2026 Robert G. Jr. Spignesi Class A Common Stock A 264,000 $0.00 1,226,097 D A
11 Feb, 2026 Sean M Wirtjes Class A Common Stock A 97,000 $0.00 580,928 D A
11 Feb, 2026 John J. Addington Wilson Class A Common Stock A 74,000 $0.00 331,768 D A