Cartesian Therapeutics's three largest insider shareholders as of April 17, 2026 are Timothy A Springer (Director, 8.65Mn shares), Timothy A Springer (Director, 8.65Mn shares), Murat Kalayoglu (TenPercentOwner, 5.31Mn shares).
| Holder | Position | Shares (Direct) | Shares (Indirect) | Report Date |
|---|---|---|---|---|
| Timothy A Springer | - | 8,646,285 | 0 | 06 Jan, 2026 |
| Timothy A Springer | - | 8,646,285 | 0 | 06 Jan, 2026 |
| Elizabeth Hoge | - | 0 | 5,313,261 | 06 Apr, 2026 |
| Murat Kalayoglu | - | 0 | 5,313,261 | 06 Apr, 2026 |
| Elizabeth Hoge | - | 0 | 4,555,260 | 15 Oct, 2024 |
| Murat Kalayoglu | - | 0 | 4,555,260 | 15 Oct, 2024 |
| Murat Kalayoglu | - | 0 | 4,555,260 | 15 Oct, 2024 |
| Murat Kalayoglu | - | 257,739 | 3,303,699 | 15 Nov, 2023 |
| Timothy A Springer | - | 0 | 656,513 | 11 Apr, 2025 |
| Timothy A Springer | - | 0 | 656,513 | 11 Apr, 2025 |
| Murat Kalayoglu | - | 511,577 | 0 | 06 Jan, 2026 |
| Murat Kalayoglu | - | 511,577 | 0 | 06 Jan, 2026 |
| Elizabeth Hoge | - | 0 | 506,377 | 10 Apr, 2024 |
| Elizabeth Hoge | - | 0 | 506,377 | 10 Apr, 2024 |
| Peter G Traber | Chief Medical Officer | 451,826 | 0 | 26 Sep, 2023 |
| Peter G Traber | Chief Medical Officer | 451,826 | 0 | 26 Sep, 2023 |
| Carrie Smith Cox | - | 390,881 | 0 | 04 Jan, 2024 |
| Timothy A Springer | - | 0 | 330,695 | 04 Oct, 2024 |
| Timothy A Springer | - | 0 | 330,695 | 04 Oct, 2024 |
| Carsten Brunn | President And Ceo | 323,530 | 0 | 08 Jan, 2026 |
| Lloyd P. Johnston | Chief Operations Officer | 265,515 | 0 | 06 Jan, 2023 |
| Murat Kalayoglu | - | 257,739 | 0 | 15 Nov, 2023 |
| Takashi Kei Kishimoto | Chief Scientific Officer | 225,316 | 0 | 01 Jun, 2023 |
| Aymeric Sallin | - | 178,000 | 0 | 04 Jan, 2024 |
| Aymeric Sallin | - | 178,000 | 0 | 04 Jan, 2024 |
| Michael Singer | - | 110,123 | 60,841 | 15 Nov, 2023 |
| Michael Singer | - | 110,123 | 60,841 | 15 Nov, 2023 |
| Timothy A Springer | - | 123,925 | 24,785 | 15 Nov, 2023 |
| Timothy A Springer | - | 123,925 | 24,785 | 15 Nov, 2023 |
| Blaine Davis | Chief Financial Officer | 121,220 | 0 | 08 Jan, 2026 |
| Michael Singer | - | 0 | 118,134 | 10 Apr, 2024 |
| Michael Singer | - | 0 | 118,134 | 10 Apr, 2024 |
| Emily English | Chief Operations Officer | 94,226 | 0 | 06 Jan, 2026 |
| Emily English | Chief Operations Officer | 94,226 | 0 | 06 Jan, 2026 |
| Kevin Tan | Chief Financial Officer | 77,000 | 0 | 05 Jan, 2022 |
| Kevin Tan | Chief Financial Officer | 77,000 | 0 | 05 Jan, 2022 |
| Christopher M Jewell | Chief Scientific Officer | 62,490 | 0 | 13 Jan, 2025 |
| Christopher M Jewell | Chief Scientific Officer | 62,490 | 0 | 13 Jan, 2025 |
| Metin Kurtoglu | Chief Technology Officer | 62,258 | 0 | 07 Jan, 2025 |
| Metin Kurtoglu | Chief Technology Officer | 62,258 | 0 | 07 Jan, 2025 |
| Milos Miljkovic | Chief Medical Officer | 58,820 | 0 | 08 Jan, 2026 |
| Milos Miljkovic | Chief Medical Officer | 58,820 | 0 | 08 Jan, 2026 |
| Timothy C Barabe | - | 56,966 | 0 | 06 Jan, 2026 |
| Michael Singer | - | 49,578 | 0 | 13 Mar, 2026 |
| Michael Singer | - | 49,578 | 0 | 13 Mar, 2026 |
| Carrie Smith Cox | - | 15,629 | 0 | 06 Jan, 2025 |
| Patrick J Zenner | - | 12,974 | 0 | 06 Jan, 2026 |
| Patrick J Zenner | - | 12,974 | 0 | 06 Jan, 2026 |
| Nishan M Desilva | - | 11,366 | 0 | 06 Jan, 2026 |
| Kemal Malik | - | 11,133 | 0 | 06 Jan, 2026 |
| Kemal Malik | - | 11,133 | 0 | 06 Jan, 2026 |
| June Ann Seymour | Chief Accounting Officer | 6,500 | 0 | 06 Jan, 2026 |
| June Ann Seymour | Chief Accounting Officer | 6,500 | 0 | 06 Jan, 2026 |
| Adrian Ion Bot | - | 5,800 | 0 | 18 Dec, 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.
| Transaction Date | Insider Name | Security Class | Transaction Type | Shares Traded | Price | Shares Remaining | Ownership | Code |
|---|---|---|---|---|---|---|---|---|
| 02 Apr, 2026 | Murat Kalayoglu | Common Stock | A | 758,001 | - | 5,313,261 | I | M |
| 02 Apr, 2026 | Elizabeth Hoge | Common Stock | A | 758,001 | - | 5,313,261 | I | M |
| 02 Apr, 2026 | Murat Kalayoglu | Series A Non-Voting Convertible Preferred Stock | D | 22,740 | - | 33,662 | I | M |
| 02 Apr, 2026 | Elizabeth Hoge | Series A Non-Voting Convertible Preferred Stock | D | 22,740 | - | 33,662 | I | M |
| 13 Mar, 2026 | Michael Singer | Common Stock | D | 6,555 | $0.00 | 49,578 | D | G |
| 06 Jan, 2026 | Milos Miljkovic | Common Stock | D | 3,573 | $6.82 | 58,820 | D | S |
| 06 Jan, 2026 | Carsten Brunn | Common Stock | D | 23,766 | $6.82 | 323,530 | D | S |
| 02 Jan, 2026 | Kemal Malik | Common Stock | A | 2,600 | $0.00 | 11,133 | D | A |
| 02 Jan, 2026 | Carsten Brunn | Common Stock | A | 143,200 | $0.00 | 347,296 | D | A |
| 02 Jan, 2026 | Murat Kalayoglu | Common Stock | A | 2,600 | $0.00 | 511,577 | D | A |
| 02 Jan, 2026 | Timothy A Springer | Common Stock | A | 2,600 | $0.00 | 8,646,285 | D | A |
| 02 Jan, 2026 | Michael Singer | Common Stock | A | 2,600 | $0.00 | 56,133 | D | A |
| 02 Jan, 2026 | Nishan M Desilva | Common Stock | A | 2,600 | $0.00 | 11,366 | D | A |
| 02 Jan, 2026 | Patrick J Zenner | Common Stock | A | 2,600 | $0.00 | 12,974 | D | A |
| 02 Jan, 2026 | Emily English | Common Stock | A | 24,000 | $0.00 | 94,226 | D | A |
| 02 Jan, 2026 | June Ann Seymour | Common Stock | A | 6,500 | $0.00 | 6,500 | D | A |
| 02 Jan, 2026 | Milos Miljkovic | Common Stock | A | 27,000 | $0.00 | 62,393 | D | A |
| 02 Jan, 2026 | Timothy C Barabe | Common Stock | A | 2,600 | $0.00 | 56,966 | D | A |
| 02 Jan, 2026 | Nishan M Desilva | Stock Option (Right to Buy) | A | 7,800 | $0.00 | 7,800 | D | A |
| 02 Jan, 2026 | Emily English | Employee Stock Option (right to buy) | A | 71,000 | $0.00 | 71,000 | D | A |