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SCHEDULE Filed 2025-01-15 Event 2025-01-13 SEC 0001213900-25-003855 →

SPRINGER TIMOTHY A → Cartesian Therapeutics, Inc. RNAC

Stake: 36.90% Shares: 9,555,394 CUSIP: 816212302 Class: Common Stock, $0.0001 par value per share
Composite Decision Signal · PASS (LOW BASE-RATE EDGE) Conviction Score: 28/100 · Filer 90d Win Rate: 0% · Hist. 90d Edge: -14.5%
  • Passive Schedule 13G filer baseline
  • High conviction ownership stake (36.9%)
  • Held by 1 tracked 13F institutional manager
  • 8 NPORT-P mutual funds holding CUSIP
  • Elevated short days-to-cover (11.7 DTC)

Item 4 — Purpose of Transaction

N/A

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
10 filings by this filer
9 other filings 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 2025-01-13 on RNAC

+1 day
-1.7%
+5 days
+8.3%
+30 days
+3.2%
+60 days
-13.8%
+90 days
-29.1%
+180 days
-28.8%

Anchor price 18.33 on closest trading day on/after 2025-01-13. Source: Yahoo Finance daily adj_close (split + dividend adjusted).

Form 4 Insider Transactions · last 365d

DateInsiderRoleTypeSharesPriceValue
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.

FiledFormFilerStakeShares
2026-04-02 SCHEDULE 13D/A Kalayoglu Murat 19.90% 5,833,971 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 — — view →
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 SPRINGER TIMOTHY A

FiledFormIssuerStakeShares
2025-02-10 SCHEDULE Tectonic Therapeutic, Inc. TECX 29.20% 4,226,058 view →
2024-07-05 SC Cartesian Therapeutics, Inc. RNAC — — view →
2024-04-12 SC Cartesian Therapeutics, Inc. RNAC — — view →
2021-12-27 SC SELECTA BIOSCIENCES INC RNAC — — view →
2021-05-27 SC SELECTA BIOSCIENCES INC RNAC — — view →
2020-10-23 SC SELECTA BIOSCIENCES INC RNAC — — view →
2020-10-15 SC SELECTA BIOSCIENCES INC RNAC — — view →
2020-01-02 SC SELECTA BIOSCIENCES INC RNAC — — view →
2019-12-17 SC SELECTA BIOSCIENCES INC RNAC — — view →

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