Murat Kalayoglu - 02 Jan 2026 Form 4 Insider Report for Cartesian Therapeutics, Inc. (RNAC)

Role: Director, 10%+ Owner
Signature: /s/ Matthew Bartholomae, Attorney-in-Fact for Murat Kalayoglu
Issuer symbol: RNAC
Transactions as of: 02 Jan 2026
Net transactions value: $0
Form type: 4
Filing time: 06 Jan 2026, 16:18:07 UTC
Previous filing: 06 Jan 2025
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Kalayoglu Murat	Director, 10%+ Owner	C/O CARTESIAN THERAPEUTICS, INC., 7495 NEW HORIZON WAY, FREDERICK	/s/ Matthew Bartholomae, Attorney-in-Fact for Murat Kalayoglu	06 Jan 2026	0002000002

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	RNAC	Common Stock	Award	$0	+2,600	+0.51%	$0.000000	511,577	02 Jan 2026	Direct	F1
holding	RNAC	Common Stock						4,555,260	02 Jan 2026	by trust	F2

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction	RNAC	Stock Option (Right to Buy)	Award	$0	+7,800		$0.000000	7,800	02 Jan 2026	Common Stock	7,800	$6.76	Direct

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	Each Restricted Stock Unit represents a contingent right to receive one share of common stock, which will vest in full on January 2, 2027.
F2	Shares are held in a trust (the "Trust") for the benefit of the reporting person's spouse and children. The reporting person's spouse is a trustee of the trust.