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SCHEDULE 13D/A
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0001193125-26-140633
Stake: 19.90%
Shares: 5,833,971
CUSIP: 816212104
Class: Common Stock
Composite Decision Signal · PASS (LOW BASE-RATE EDGE)
Conviction Score: 36/100 · Filer 90d Win Rate: 100% · Hist. 90d Edge: +63.4%
- Active Schedule 13D filer baseline
- High conviction ownership stake (19.9%)
- Held by 1 tracked 13F institutional manager
- Elevated short days-to-cover (11.7 DTC)
Item 4 — Purpose of Transaction
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.
Cross-References
Insider Activity (last 365d)
2 transactions
0 buys · 0 sales · 2 awards/exercises
Issuer Cluster
16 13D/G filings on this issuer
15 other filings besides this one
Filer Track Record
2 filings by this filer
1 other filing in the data moat
Short Interest · settle 2026-10-15
DTC 11.73
1,875,103 shares short · +1.1% vs prior
Institutional Consensus · 2025-12-31
Held by elite portfolio managers
1 holder · $244K
Point72 Asset Mgmt
Post-Filing Returns · since 2026-03-31 on RNAC
Anchor price 6.15 on closest trading day on/after 2026-03-31. Source: Yahoo Finance daily adj_close (split + dividend adjusted).
Form 4 Insider Transactions · last 365d
| Date | Insider | Role | Type | Shares | Price | Value |
|---|
| 2026-04-02 |
Hoge Elizabeth |
10%+ owner |
Option exercise |
758,001 |
— |
— |
| 2026-04-02 |
Kalayoglu Murat |
10%+ owner |
Option exercise |
758,001 |
— |
— |
Other 13D/G Filings on Cartesian Therapeutics, Inc.
| Filed | Form | Filer | Stake | Shares | |
|---|
| 2025-01-15 |
SCHEDULE |
SPRINGER TIMOTHY A |
36.90% |
9,555,394 |
view → |
| 2024-10-15 |
SC |
Kalayoglu Murat |
— |
— |
view → |
| 2024-07-05 |
SC |
SPRINGER TIMOTHY A |
— |
— |
view → |
| 2024-04-12 |
SC |
SPRINGER TIMOTHY A |
— |
— |
view → |
| 2021-12-27 |
SC |
SPRINGER TIMOTHY A |
— |
— |
view → |
| 2021-05-27 |
SC |
SPRINGER TIMOTHY A |
— |
— |
view → |
| 2020-10-23 |
SC |
SPRINGER TIMOTHY A |
— |
— |
view → |
| 2020-10-15 |
SC |
SPRINGER TIMOTHY A |
— |
— |
view → |
| 2020-02-05 |
SC |
ORBIMED ADVISORS LLC |
— |
— |
view → |
| 2020-01-02 |
SC |
SPRINGER TIMOTHY A |
— |
— |
view → |
| 2019-12-17 |
SC |
SPRINGER TIMOTHY A |
— |
— |
view → |
| 2019-11-13 |
SC |
ORBIMED ADVISORS LLC |
— |
— |
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| 2019-02-04 |
SC |
Polaris Venture Partners V, L.P. |
— |
— |
view → |
| 2018-05-03 |
SC |
Polaris Venture Partners V, L.P. |
— |
— |
view → |
| 2018-01-26 |
SC |
ORBIMED ADVISORS LLC |
— |
— |
view → |
Other Filings by Kalayoglu Murat
| Filed | Form | Issuer | Stake | Shares | |
|---|
| 2024-10-15 |
SC |
Cartesian Therapeutics, Inc. RNAC |
— |
— |
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