Cartesian Therapeutics
Develops outpatient mRNA CAR-T candidates for autoimmune diseases, led by Descartes-08.
$9.60
After-hours close+0.03 (+0.31%)
At close$9.57(−4.01%)
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Breakdown13F · Form 4
Institutions 24.34%7.15M sharesInsiders 33.04%9.71M sharesOther 42.62%12.52M shares
Shares outstanding 29.38M · Float 10.63M · 36.2% free float
Institutions13F, as of Mar 31, 2026
82 holders · 7.15M shares · 28 new positions · 56 increased · 14 reduced · 15 closed
| Holder | Shares | % outstanding | Chg q/q | Filed |
|---|---|---|---|---|
| Squarepoint Ops LLC | 2.24M | 7.62% | +2.22M | May 15, 2026 |
| FMR LLC | 799.7K | 2.72% | −567.2K | May 15, 2026 |
| BlackRock, Inc. | 599.1K | 2.04% | −10.6K | May 13, 2026 |
| Vanguard Capital Management LLC | 407.6K | 1.39% | +407.6Knew | May 15, 2026 |
| 683 Capital Management, LLC | 330.0K | 1.12% | +50.0K | May 15, 2026 |
| Millennium Management LLC | 284.3K | 0.97% | +120.0K | May 15, 2026 |
| Geode Capital Management, LLC | 263.7K | 0.90% | +8.2K | May 15, 2026 |
| Marshall Wace, LLP | 251.1K | 0.85% | +73.0K | May 15, 2026 |
Beneficial owners13D/G · 5% or more, as filed
| Holder | % of class | Shares | Form | Filed |
|---|---|---|---|---|
| Timothy A. Springerincl. TAS Partners LLC, Chafen Lu | 36.90% | 9.56M | 13D | Jan 15, 2025 ↗ |
| Murat Kalayogluincl. Elizabeth Hoge, Sinan Kalayoglu +1 more | 19.90% | 5.83M | 13D | Apr 2, 2026 ↗ |
| Squarepoint Ops LLC | 8.30% | 2.21M | 13G | Mar 13, 2026 ↗ |
| JPMorgan Chase & Co. | 6.10% | 1.68M | 13G | Apr 25, 2025 ↗ |
| Barclays PLC | 5.99% | 1.76M | 13G | Aug 13, 2026 ↗ |
InsidersForm 4
| Insider | Role | Shares | % outstanding | Filed |
|---|---|---|---|---|
| Timothy A. Springer | director, 10 percent owner: | 9.30M | 31.66% | Jan 6, 2026 |
| Kalayoglu Murat | 10 percent owner | 5.82M | 19.82% | Apr 6, 2026 |
| Carsten Brunn | director, officer: President and CEO | 323.5K | 1.10% | Jan 8, 2026 |
| Timothy C. Barabe | director | 57.0K | 0.19% | Jan 6, 2026 |
| Patrick J. Zenner | director | 13.0K | 0.04% | Jan 6, 2026 |
| Nishan M. DeSilva | director | 11.4K | 0.04% | Jan 6, 2026 |
2 ten-percent owners hold 6.33M shares by Form 4, outside the officers-and-directors figure above
Latest trades
| Date | Insider | Type | Shares | Avg price | Owned after |
|---|---|---|---|---|---|
| Jan 6, 2026 | Blaine Davisofficer: Chief Financial Officer | Sale | 10,591 | $6.82 | 121,220 |
| Jan 6, 2026 | Milos Miljkovicofficer: Chief Medical Officer | Sale | 3,573 | $6.82 | 58,820 |
| Jan 6, 2026 | Carsten Brunndirector, officer: President and CEO | Sale | 23,766 | $6.82 | 323,530 |
| Dec 4, 2025 | Timothy C. Barabedirector | Purchase | 30,000 | $6.86 | 54,366 |
CongressHouse and Senate disclosures
Not reported.