Cartesian Therapeutics Inc has 7 Schedule 13D or 13G filings on record since 2025-11-05. 3 holders' latest filing reports 5% or more of common-stock. Each figure below is the holder's own, as filed, with the filing linked.
Holders
| Holder | Percent | Shares | Latest | Event date |
|---|---|---|---|---|
| Murat Kalayoglu | 19.9% | 5,833,971 | SCHEDULE 13D/A, 2026-04-02 | 2026-03-31 |
| Squarepoint Ops LLC | 8.3% | 2,209,601 | SCHEDULE 13G, 2026-03-13 | 2026-03-09 |
| Barclays PLC | 5.99% | 1,760,326 | SCHEDULE 13G, 2026-08-13 | 2026-06-30 |
| Jpmorgan Chase & Co. | 4.8% | 1,486,252 | SCHEDULE 13G/A, 2026-07-22 | 2026-06-30 |
| Fmr LLC | 3% | 799,743 | SCHEDULE 13G/A, 2026-05-06 | 2026-03-31 |
Purpose of Transaction (Item 4)
Murat Kalayoglu
Item 4 of the Schedule 13D is supplemented as follows: On March 31, 2026, Murat Kalayoglu resigned as a member of the Issuer's board of directors. On April 2, 2026, pursuant to a Notice of Optional Conversion delivered to the Issuer by the Trust pursuant to Section 6.02 of the Certificate of Designation, as amended by the Amendment to the Certificate of Designation, 22,740.030 shares of Series A Preferred Stock held by the Trust were converted into 758,001 shares of Common Stock.Item 4 of the SCHEDULE 13D/A filed 2026-04-02
Timeline
| Filed | Holder | Percent | Filing |
|---|---|---|---|
| 2025-11-05 | Fmr LLC | 8.3% | SCHEDULE 13G/A |
| 2026-02-05 | Fmr LLC | 5.3% | SCHEDULE 13G/A |
| 2026-03-13 | Squarepoint Ops LLC | 8.3% | SCHEDULE 13G |
| 2026-04-02 | Murat Kalayoglu | 19.9% | SCHEDULE 13D/A |
| 2026-05-06 | Fmr LLC | 3% | SCHEDULE 13G/A |
| 2026-07-22 | Jpmorgan Chase & Co. | 4.8% | SCHEDULE 13G/A |
| 2026-08-13 | Barclays PLC | 5.99% | SCHEDULE 13G |
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Where this comes from
Anyone who comes to own more than 5% of a class of a listed company's voting shares has to tell the SEC. A holder who may seek to change or influence the company files Schedule 13D, and has to say in Item 4, "Purpose of Transaction", what it intends to do. A holder with no such intent, such as many index and passive funds, may file the shorter Schedule 13G. Both are amended when the stake changes, including when it falls below 5%.
Every row here is one of those filings, linked to the filing itself. Percentages and share counts are exactly as the holder filed them, for the holder the filing names; an amendment showing a lower figure is shown as filed. Item 4 text is quoted word for word. Where a 13D's Item 4 contains a sentence stating a definite intent to influence the company, that sentence is marked and quoted; the page does not describe the holder or its motives beyond the words it filed. Nothing here is investment advice.