Rapid Micro Biosystems's top three insider shareholders as of September 29, 2026 are Capital Partners Ii, Llc Longitude (TenPercentOwner, 4.03Mn shares), Lewis Management Lp Kennedy (TenPercentOwner, 2.90Mn shares), Robert G. Jr. Spignesi (President And Ceo, 1.19Mn shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | Capital Partners Ii, Llc Longitude | TenPercentOwner | 0 | 4,029,245 | 4,029,245 | 41.4% | 06 Feb, 2026 |
| 2 | Lewis Management Lp Kennedy | TenPercentOwner | 0 | 2,904,490 | 2,904,490 | 29.8% | 06 Jun, 2022 |
| 3 | Robert G. Jr. Spignesi | President And Ceo | 1,191,973 | 0 | 1,191,973 | 12.2% | 24 Jul, 2026 |
| 4 | Sean M Wirtjes | Chief Financial Officer | 568,981 | 0 | 568,981 | 5.8% | 02 Jun, 2026 |
| 5 | John J. Addington Wilson | Chief Operating Officer | 316,762 | 0 | 316,762 | 3.3% | 12 Mar, 2026 |
| 6 | Richard S Kollender | Director | 133,826 | 0 | 133,826 | 1.4% | 24 Jul, 2026 |
| 7 | Jonathan Paris | Svp, General Counsel | 128,698 | 0 | 128,698 | 1.3% | 13 Mar, 2023 |
| 8 | Victoria Vezina | Chief Human Resources Officer | 112,608 | 0 | 112,608 | 1.2% | 12 Mar, 2024 |
| 9 | Melinda Litherland Pei | Director | 100,687 | 0 | 100,687 | 1.0% | 02 Jun, 2026 |
| 10 | Inese Lowenstein | Director | 70,687 | 0 | 70,687 | 0.7% | 02 Jun, 2026 |
| 11 | Kirk Malloy | Director | 60,687 | 0 | 60,687 | 0.6% | 02 Jun, 2026 |
| 12 | Richard A Keys | Chief Commercial Officer | 43,750 | 0 | 43,750 | 0.4% | 15 Feb, 2022 |
| 13 | Natale S Ricciardi | Director | 29,442 | 0 | 29,442 | 0.3% | 02 Mar, 2026 |
| 14 | Dafni Bika | Director | 19,300 | 0 | 19,300 | 0.2% | 26 May, 2026 |
| 15 | Jeffrey Lawrence Schwartz | Director, TenPercentOwner | 14,300 | 0 | 14,300 | 0.1% | 28 May, 2024 |
| 16 | David Hirsch | Director | 14,300 | 0 | 14,300 | 0.1% | 28 May, 2024 |
Each row is that insider’s most recently reported position, from Form 4 filings over the last 60 months — which is why this total does not tie to the quarterly series above, where a quarter counts only the insiders who filed in it. Shares held through a fund or institutional portfolio are counted on the institutional ownership page instead.
| Date | Insider | Position | Transaction | Shares | Price | Value | Shares Held After | Ownership |
|---|---|---|---|---|---|---|---|---|
| 24 Jul, 2026 | Richard S Kollender | Director | Acquired M | 1,681 | $0.75 | $1.26K | 131,999 | Direct |
| 22 Jul, 2026 | Robert G. Jr. Spignesi | President And Ceo | Acquired M | 1,402 | $0.75 | $1.05K | 1,191,973 | Direct |
| 22 Jul, 2026 | Robert G. Jr. Spignesi | President And Ceo | Disposed M | 1,402 | $0.00 | $0 | 0 | Direct |
| 24 Jul, 2026 | Richard S Kollender | Director | Acquired M | 1,827 | $0.75 | $1.37K | 133,826 | Direct |
| 24 Jul, 2026 | Richard S Kollender | Director | Disposed M | 1,681 | $0.00 | $0 | 0 | Direct |
| 24 Jul, 2026 | Richard S Kollender | Director | Disposed M | 1,827 | $0.00 | $0 | 0 | Direct |
| 29 May, 2026 | Melinda Litherland Pei | Director | Acquired A | 12,787 | $1.96 | $25.00K | 100,687 | Direct |
| 29 May, 2026 | Inese Lowenstein | Director | Acquired A | 12,787 | $1.96 | $25.00K | 70,687 | Direct |
| 29 May, 2026 | Kirk Malloy | Director | Acquired A | 12,787 | $1.96 | $25.00K | 60,687 | Direct |
| 29 May, 2026 | Robert G. Jr. Spignesi | President And Ceo | Acquired A | 12,787 | $1.96 | $25.00K | 1,190,571 | Direct |
| 29 May, 2026 | Sean M Wirtjes | Chief Financial Officer | Acquired A | 12,787 | $1.96 | $25.00K | 568,981 | Direct |
| 29 May, 2026 | Sean M Wirtjes | Chief Financial Officer | Acquired A | 12,787 | $0.00 | $0 | 12,787 | Direct |
| 29 May, 2026 | Melinda Litherland Pei | Director | Acquired A | 12,787 | $0.00 | $0 | 12,787 | Direct |
| 29 May, 2026 | Robert G. Jr. Spignesi | President And Ceo | Acquired A | 12,787 | $0.00 | $0 | 12,787 | Direct |
| 29 May, 2026 | Inese Lowenstein | Director | Acquired A | 12,787 | $0.00 | $0 | 12,787 | Direct |
| 29 May, 2026 | Inese Lowenstein | Director | Acquired A | 12,787 | $0.00 | $0 | 12,787 | Direct |
| 29 May, 2026 | Robert G. Jr. Spignesi | President And Ceo | Acquired A | 12,787 | $0.00 | $0 | 12,787 | Direct |
| 29 May, 2026 | Kirk Malloy | Director | Acquired A | 12,787 | $0.00 | $0 | 12,787 | Direct |
| 29 May, 2026 | Melinda Litherland Pei | Director | Acquired A | 12,787 | $0.00 | $0 | 12,787 | Direct |
| 29 May, 2026 | Sean M Wirtjes | Chief Financial Officer | Acquired A | 12,787 | $0.00 | $0 | 12,787 | Direct |