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[Form 3] Cartesian Therapeutics, Inc. Initial Statement of Beneficial Ownership

Filing Impact
(Low)
Filing Sentiment
(Neutral)
Form Type
3
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.

Cartesian Therapeutics, Inc. (RNAC) ha presentato una dichiarazione iniziale di proprietà beneficiante, Form 3, per l'ufficiale June Ann Seymour, che ricopre la carica di Chief Accounting Officer. La dichiarazione indica che non si possiedono azioni in modo benefico.

La data dell'evento che richiede la dichiarazione è 10/27/2025. Il modulo è stato presentato da una persona dichiarante e firmato da /s/ Matthew Bartholomae in qualità di procuratore-in-fact ai sensi di una procura allegata all'Esibizione 24.

Cartesian Therapeutics, Inc. (RNAC) presentó una declaración inicial de propiedad beneficiosa, Formulario 3, para la funcionaria June Ann Seymour, quien ejerce como Chief Accounting Officer. El registro indica que no se poseen valores de forma beneficiosa.

La fecha del evento que requiere la declaración es 10/27/2025. El formulario fue presentado por una única persona reportante y firmado por /s/ Matthew Bartholomae como apoderado conforme a un poder de procuración del Exhibit 24.

Cartesian Therapeutics, Inc. (RNAC) 은 임원 June Ann Seymour를 위한 초기의 유익소유 보고서(Form 3)을 제출했으며, 그녀는 Chief Accounting Officer를 맡고 있습니다. 제출서는 유익하게 소유한 증권이 없다고 명시합니다.

보고서를 요구하는 사건의 날짜는 10/27/2025입니다. 양식은 한 명의 보고인에 의해 제출되었고, /s/ Matthew Bartholomae가 Exhibit 24의 위임장에 따라 대리인으로 서명했습니다.

Cartesian Therapeutics, Inc. (RNAC) a déposé une déclaration initiale de propriété bénéficiaire, Formulaire 3, pour l'officier June Ann Seymour, qui occupe le poste de Chief Accounting Officer. Le dépôt indique que aucun titre n'est détenu en propriété bénéficiaire.

La date de l'événement nécessitant la déclaration est 10/27/2025. Le formulaire a été déposé par une seule personne déclarant et signé par /s/ Matthew Bartholomae en tant que mandataire conformément à une procuration d'Exhibit 24.

Cartesian Therapeutics, Inc. (RNAC) hat eine Form 3-Anfangserklärung über den Beneficial Ownership für die Beamtin June Ann Seymour, die als Chief Accounting Officer tätig ist, eingereicht. Die Einreichung besagt, dass keine Wertpapiere vorteilhaft innewohnen.

Das Datum des Ereignisses, das die Erklärung erfordert, ist 10/27/2025. Das Formular wurde von einer meldenden Person eingereicht und von /s/ Matthew Bartholomae als Bevollmächtigter gemäß einer Vollmacht gemäß Anhang 24 unterschrieben.

Cartesian Therapeutics, Inc. (RNAC) قدمت إقرارًا ابتدائيًا بالملكية المفيدة من النموذج 3 لمسؤول June Ann Seymour، الذي يشغل منصب Chief Accounting Officer. ينص الإقرار على أن لا توجد أسهم مملوكة بصورة مستفيدة.

تاريخ الحدث الذي يستلزم الإقرار هو 10/27/2025. تم تقديم النموذج من قِبل شخص واحد مُبلغ عنه ووقع عليه /s/ Matthew Bartholomae كوكيل بموجب توكيل Exhibit 24.

Positive
  • None.
Negative
  • None.

Cartesian Therapeutics, Inc. (RNAC) ha presentato una dichiarazione iniziale di proprietà beneficiante, Form 3, per l'ufficiale June Ann Seymour, che ricopre la carica di Chief Accounting Officer. La dichiarazione indica che non si possiedono azioni in modo benefico.

La data dell'evento che richiede la dichiarazione è 10/27/2025. Il modulo è stato presentato da una persona dichiarante e firmato da /s/ Matthew Bartholomae in qualità di procuratore-in-fact ai sensi di una procura allegata all'Esibizione 24.

Cartesian Therapeutics, Inc. (RNAC) presentó una declaración inicial de propiedad beneficiosa, Formulario 3, para la funcionaria June Ann Seymour, quien ejerce como Chief Accounting Officer. El registro indica que no se poseen valores de forma beneficiosa.

La fecha del evento que requiere la declaración es 10/27/2025. El formulario fue presentado por una única persona reportante y firmado por /s/ Matthew Bartholomae como apoderado conforme a un poder de procuración del Exhibit 24.

Cartesian Therapeutics, Inc. (RNAC) 은 임원 June Ann Seymour를 위한 초기의 유익소유 보고서(Form 3)을 제출했으며, 그녀는 Chief Accounting Officer를 맡고 있습니다. 제출서는 유익하게 소유한 증권이 없다고 명시합니다.

보고서를 요구하는 사건의 날짜는 10/27/2025입니다. 양식은 한 명의 보고인에 의해 제출되었고, /s/ Matthew Bartholomae가 Exhibit 24의 위임장에 따라 대리인으로 서명했습니다.

Cartesian Therapeutics, Inc. (RNAC) a déposé une déclaration initiale de propriété bénéficiaire, Formulaire 3, pour l'officier June Ann Seymour, qui occupe le poste de Chief Accounting Officer. Le dépôt indique que aucun titre n'est détenu en propriété bénéficiaire.

La date de l'événement nécessitant la déclaration est 10/27/2025. Le formulaire a été déposé par une seule personne déclarant et signé par /s/ Matthew Bartholomae en tant que mandataire conformément à une procuration d'Exhibit 24.

Cartesian Therapeutics, Inc. (RNAC) hat eine Form 3-Anfangserklärung über den Beneficial Ownership für die Beamtin June Ann Seymour, die als Chief Accounting Officer tätig ist, eingereicht. Die Einreichung besagt, dass keine Wertpapiere vorteilhaft innewohnen.

Das Datum des Ereignisses, das die Erklärung erfordert, ist 10/27/2025. Das Formular wurde von einer meldenden Person eingereicht und von /s/ Matthew Bartholomae als Bevollmächtigter gemäß einer Vollmacht gemäß Anhang 24 unterschrieben.

Cartesian Therapeutics, Inc. (RNAC) قدمت إقرارًا ابتدائيًا بالملكية المفيدة من النموذج 3 لمسؤول June Ann Seymour، الذي يشغل منصب Chief Accounting Officer. ينص الإقرار على أن لا توجد أسهم مملوكة بصورة مستفيدة.

تاريخ الحدث الذي يستلزم الإقرار هو 10/27/2025. تم تقديم النموذج من قِبل شخص واحد مُبلغ عنه ووقع عليه /s/ Matthew Bartholomae كوكيل بموجب توكيل Exhibit 24.

Cartesian Therapeutics, Inc. (RNAC) 已就任官员June Ann Seymour提交了Form 3初始受益所有权声明,该官员担任Chief Accounting Officer一职。该申报表声明没有受益所有的证券

需要声明的事件日期为2025/10/27。该表格由一名申报人提交,并由/s/ Matthew Bartholomae签署,作为 Exhibit 24 授权书的代理人签署。

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
OMB APPROVAL
OMB Number: 3235-0104
Estimated average burden
hours per response: 0.5
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.
Cartesian

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Biotechnology
Pharmaceutical Preparations
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United States
FREDERICK