Rapid Micro Biosystems's three largest insider shareholders as of March 23, 2026 are Capital Life Sciences Investors, Llc Bain (TenPercentOwner, 8.43Mn shares), David Hirsch (Director, 3.41Mn shares), Lewis Management Lp Kennedy (TenPercentOwner, 2.90Mn shares).
| Holder | Position | Shares (Direct) | Shares (Indirect) | Report Date |
|---|---|---|---|---|
| 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 |
| Sean M Wirtjes | Chief Financial Officer | 556,194 | 0 | 12 Mar, 2026 |
| John J. Addington Wilson | Chief Operating Officer | 316,762 | 0 | 12 Mar, 2026 |
| Victoria Vezina | Chief Human Resources Officer | 112,608 | 0 | 12 Mar, 2024 |
| Natale S Ricciardi | 29,442 | 0 | 02 Mar, 2026 | |
| Jeffrey Lawrence Schwartz | 14,300 | 0 | 28 May, 2024 |
* 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.
| 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 |
| 11 Mar, 2026 | Sean M Wirtjes | Class A Common Stock | D | 7,480 | $4.32 | 556,194 | 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 | Stock Option (Right to Buy) | D | 842 | $0.75 | 0 | D | M |
| 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 | Sean M Wirtjes | Class A Common Stock | D | 17,254 | $3.92 | 563,674 | 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 | Sean M Wirtjes | Stock Option (Right to Buy) | A | 193,000 | $0.00 | 193,000 | D | A |
| 11 Feb, 2026 | John J. Addington Wilson | Stock Option (Right to Buy) | A | 147,000 | $0.00 | 147,000 | D | A |
| 11 Feb, 2026 | Robert G. Jr. Spignesi | Stock Option (Right to Buy) | A | 528,000 | $0.00 | 528,000 | D | A |
| 09 Feb, 2026 | Robert G. Jr. Spignesi | Class A Common Stock | D | 12,840 | $3.78 | 962,097 | D | S |
| 09 Feb, 2026 | Sean M Wirtjes | Class A Common Stock | D | 6,027 | $3.78 | 483,928 | D | S |
| 09 Feb, 2026 | John J. Addington Wilson | Class A Common Stock | D | 4,610 | $3.78 | 257,768 | D | S |
| 17 Oct, 2025 | Robert G. Jr. Spignesi | Class A Common Stock | A | 3,400 | $0.75 | 973,950 | D | M |
| 17 Oct, 2025 | Robert G. Jr. Spignesi | Class A Common Stock | D | 2,072 | $3.08 | 971,878 | D | F |
| 17 Oct, 2025 | Robert G. Jr. Spignesi | Class A Common Stock | A | 7,833 | $0.75 | 979,711 | D | M |