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

Item 4 — Purpose of Transaction

N/A

Insider Activity (last 365d)

0 transactions

0 buys · 0 sales · 0 awards/exercises

Issuer Cluster

4 13D/G filings on this issuer

3 other filings besides this one

Filer Track Record

2 filings by this filer

1 other filing in the data moat

Short Interest · settle 2026-03-31

DTC 14.66

2,170,494 shares short · +2.4% vs prior

Held by elite portfolio managers

1 holder · $244K

Point72 Asset Mgmt

+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).

Filed	Form	Filer	Stake	Shares
2026-04-02	SCHEDULE 13D/A	Kalayoglu Murat	19.90%	5,833,971	view →
2018-05-03	SC	Polaris Venture Partners V, L.P.	—	—	view →
2018-01-26	SC	ORBIMED ADVISORS LLC	—	—	view →

Filed	Form	Issuer	Stake	Shares
2025-02-10	SCHEDULE	Tectonic Therapeutic, Inc. TECX	29.20%	4,226,058	view →

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