Cartesian Therapeutics (RNAC) Form 3 shows zero holdings

Rhea-AI Filing Summary

Cartesian Therapeutics, Inc. (RNAC) filed a Form 3 initial statement of beneficial ownership for officer June Ann Seymour, who serves as Chief Accounting Officer. The filing states that no securities are beneficially owned.

The date of the event requiring the statement is 10/27/2025. The form was filed by one reporting person and signed by /s/ Matthew Bartholomae as attorney-in-fact pursuant to an Exhibit 24 power of attorney.

SEC Form 3

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person^*

Seymour June Ann

(Last) (First) (Middle)

C/O CARTESIAN THERAPEUTICS, INC.

7495 NEW HORIZON WAY

(Street)

FREDERICK MD 21703

(City) (State) (Zip)

2. Date of Event Requiring Statement (Month/Day/Year)
10/27/2025

3. Issuer Name and Ticker or Trading Symbol
Cartesian Therapeutics, Inc. [ RNAC ]

4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Accounting Officer

5. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

Remarks:

Exhibit 24 - Power of Attorney

No securities are beneficially owned.

	/s/ Matthew Bartholomae, Attorney-in-Fact for June Ann Seymour	10/28/2025
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 5 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

FAQ

What did RNAC file?

A Form 3 initial statement of beneficial ownership.

Who is the reporting person in RNAC's Form 3?

June Ann Seymour, serving as Chief Accounting Officer.

How many RNAC securities are beneficially owned?

The filing states no securities are beneficially owned.

What is the event date on the Form 3?

The event date is 10/27/2025.

Is this a joint filing?

No. It is filed by one reporting person.

Who signed the Form 3 for the reporting person?

It was signed by /s/ Matthew Bartholomae, attorney-in-fact under Exhibit 24.