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[Form 4] Cartesian Therapeutics, Inc. Insider Trading Activity

Filing Impact
(Low)
Filing Sentiment
(Neutral)
Form Type
4
Rhea-AI Filing Summary

Cartesian Therapeutics (RNAC) reported a Form 4 for its Chief Accounting Officer, June Ann Seymour, documenting an equity award. On 10/27/2025, Seymour received an employee stock option50,000 shares at an exercise price of $8.85 per share, expiring on 10/27/2035.

The option vests as to 25% on 10/27/2026, with the remaining underlying shares vesting in three equal annual installments so that all shares are fully vested on 10/27/2029. The filing lists ownership of the derivative security as Direct (D) with 50,000 derivative securities beneficially owned following the reported transaction.

Cartesian Therapeutics (RNAC) ha riportato un Form 4 per il suo Chief Accounting Officer, June Ann Seymour, documentando un premio azionario. Il 27/10/2025, Seymour ha ricevuto una opzione di acquisto azioni per acquistare 50.000 azioni a un prezzo di esercizio di $8,85 per azione, con scadenza il 27/10/2035.

L’opzione matura al 25% il 27/10/2026, con le azioni sottostanti rimanenti che maturano in tre rate annuali uguali affinché tutte le azioni siano completamente maturate entro il 27/10/2029. La dichiarazione riporta la proprietà del titolo derivato come Diretto (D), con 50.000 titoli derivati detenuti economicamente a seguito della transazione riportata.

Cartesian Therapeutics (RNAC) informó un Formulario 4 para su Jefe de Contabilidad, June Ann Seymour, documentando una adjudicación de acciones. El 27/10/2025, Seymour recibió una opción de compra de acciones para adquirir 50,000 acciones a un precio de ejercicio de $8.85 por acción, con vencimiento el 27/10/2035.

La opción se consolida al 25% el 27/10/2026, con las acciones subyacentes restantes que se consolidan en tres pagos anuales iguales para que todas las acciones estén totalmente vestidas el 27/10/2029. La declaración lista la propiedad del valor derivado como Directa (D) con 50,000 valores derivados beneficiosamente poseídos tras la transacción reportada.

Cartesian Therapeutics (RNAC)은 최고 회계 책임자 June Ann Seymour를 위한 Form 4를 보고했고, 주식 수여를 문서화했습니다. 2025년 10월 27일 Seymour는 50,000주$8.85의 행사 가격으로 구입할 수 있는 주식매수선택권을 받았으며, 만기는 2035년 10월 27일입니다.

이 옵션은 2026년 10월 27일25%가 vest(성취)되고, 나머지 기초 주식은 3년 간의 동액 분할로 vest하여 모든 주식이 2029년 10월 27일에 완전히 vest됩니다. 신고서는 파생증권의 소유를 직접(D)으로 기재하고, 보고된 거래 이후 50,000개의 파생증권을 유익하게 보유하고 있습니다.

Cartesian Therapeutics (RNAC) a déclaré un Formulaire 4 pour son directeur comptable, June Ann Seymour, documentant une attribution d’actions. Le 27/10/2025, Seymour a reçu une option d’achat d’actions pour acheter 50 000 actions à un prix d’exercice de $8,85 par action, expirant le 27/10/2035.

L’option se vest à 25% le 27/10/2026, les actions sous-jacentes restantes se vissant selon trois paiements annuels égaux afin que toutes les actions soient complètement vestées le 27/10/2029. Le dossier indique la propriété de l’instrument dérivé comme Directe (D) avec 50 000 titres dérivés détenus bénéficiairement après la transaction rapportée.

Cartesian Therapeutics (RNAC) meldete ein Form 4 für den Chief Accounting Officer, June Ann Seymour, und dokumentierte eine Aktienzuweisung. Am 27.10.2025 erhielt Seymour eine Aktienoptionsoption, mit der sie 50.000 Aktien zu einem Ausübungspreis von $8,85 pro Aktie erwerben kann, läuft am 27.10.2035 ab.

Die Option vestet mit 25% am 27.10.2026, wobei die verbleibenden zugrunde liegenden Aktien in drei gleichen jährlichen Raten vesten, so dass alle Aktien am 27.10.2029 vollständig vesten. Die Einreichung führt das Eigentum an dem Derivativwert als Direkt (D) auf, mit 50.000 derivativen Wertpapieren, die nach der gemeldeten Transaktion vorteilhaft gehalten werden.

Cartesian Therapeutics (RNAC) أبلغت عن نموذج 4 لمسؤولها المحاسبي الرئيسي، جون آن سيمور، موثقةً منحة حصص. في 27/10/2025، تلقت سيمور خيار شراء أسهم لشراء 50,000 سهم بسعر تنفيذ قدره $8.85 للسهم، ينتهي في 27/10/2035.

يترسخ الخيار بنسبة 25% في 27/10/2026، مع ترسُّخ الأسهم الأساسية المتبقية في ثلاث دفعات سنوية متساوية بحيث تكون جميع الأسهم مكتملة الترسب في 27/10/2029. وتذكر الإيداع ملكية الأداة المشتقة بوصفها مباشر (D) مع 50,000 أداة مشتقة مملوكة بفائدة عقب الصفقة المبلغ عنها.

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Cartesian Therapeutics (RNAC) ha riportato un Form 4 per il suo Chief Accounting Officer, June Ann Seymour, documentando un premio azionario. Il 27/10/2025, Seymour ha ricevuto una opzione di acquisto azioni per acquistare 50.000 azioni a un prezzo di esercizio di $8,85 per azione, con scadenza il 27/10/2035.

L’opzione matura al 25% il 27/10/2026, con le azioni sottostanti rimanenti che maturano in tre rate annuali uguali affinché tutte le azioni siano completamente maturate entro il 27/10/2029. La dichiarazione riporta la proprietà del titolo derivato come Diretto (D), con 50.000 titoli derivati detenuti economicamente a seguito della transazione riportata.

Cartesian Therapeutics (RNAC) informó un Formulario 4 para su Jefe de Contabilidad, June Ann Seymour, documentando una adjudicación de acciones. El 27/10/2025, Seymour recibió una opción de compra de acciones para adquirir 50,000 acciones a un precio de ejercicio de $8.85 por acción, con vencimiento el 27/10/2035.

La opción se consolida al 25% el 27/10/2026, con las acciones subyacentes restantes que se consolidan en tres pagos anuales iguales para que todas las acciones estén totalmente vestidas el 27/10/2029. La declaración lista la propiedad del valor derivado como Directa (D) con 50,000 valores derivados beneficiosamente poseídos tras la transacción reportada.

Cartesian Therapeutics (RNAC)은 최고 회계 책임자 June Ann Seymour를 위한 Form 4를 보고했고, 주식 수여를 문서화했습니다. 2025년 10월 27일 Seymour는 50,000주$8.85의 행사 가격으로 구입할 수 있는 주식매수선택권을 받았으며, 만기는 2035년 10월 27일입니다.

이 옵션은 2026년 10월 27일25%가 vest(성취)되고, 나머지 기초 주식은 3년 간의 동액 분할로 vest하여 모든 주식이 2029년 10월 27일에 완전히 vest됩니다. 신고서는 파생증권의 소유를 직접(D)으로 기재하고, 보고된 거래 이후 50,000개의 파생증권을 유익하게 보유하고 있습니다.

Cartesian Therapeutics (RNAC) a déclaré un Formulaire 4 pour son directeur comptable, June Ann Seymour, documentant une attribution d’actions. Le 27/10/2025, Seymour a reçu une option d’achat d’actions pour acheter 50 000 actions à un prix d’exercice de $8,85 par action, expirant le 27/10/2035.

L’option se vest à 25% le 27/10/2026, les actions sous-jacentes restantes se vissant selon trois paiements annuels égaux afin que toutes les actions soient complètement vestées le 27/10/2029. Le dossier indique la propriété de l’instrument dérivé comme Directe (D) avec 50 000 titres dérivés détenus bénéficiairement après la transaction rapportée.

Cartesian Therapeutics (RNAC) meldete ein Form 4 für den Chief Accounting Officer, June Ann Seymour, und dokumentierte eine Aktienzuweisung. Am 27.10.2025 erhielt Seymour eine Aktienoptionsoption, mit der sie 50.000 Aktien zu einem Ausübungspreis von $8,85 pro Aktie erwerben kann, läuft am 27.10.2035 ab.

Die Option vestet mit 25% am 27.10.2026, wobei die verbleibenden zugrunde liegenden Aktien in drei gleichen jährlichen Raten vesten, so dass alle Aktien am 27.10.2029 vollständig vesten. Die Einreichung führt das Eigentum an dem Derivativwert als Direkt (D) auf, mit 50.000 derivativen Wertpapieren, die nach der gemeldeten Transaktion vorteilhaft gehalten werden.

Cartesian Therapeutics (RNAC) أبلغت عن نموذج 4 لمسؤولها المحاسبي الرئيسي، جون آن سيمور، موثقةً منحة حصص. في 27/10/2025، تلقت سيمور خيار شراء أسهم لشراء 50,000 سهم بسعر تنفيذ قدره $8.85 للسهم، ينتهي في 27/10/2035.

يترسخ الخيار بنسبة 25% في 27/10/2026، مع ترسُّخ الأسهم الأساسية المتبقية في ثلاث دفعات سنوية متساوية بحيث تكون جميع الأسهم مكتملة الترسب في 27/10/2029. وتذكر الإيداع ملكية الأداة المشتقة بوصفها مباشر (D) مع 50,000 أداة مشتقة مملوكة بفائدة عقب الصفقة المبلغ عنها.

Cartesian Therapeutics (RNAC) 已就任命的首席会计官 June Ann Seymour 提交了 Form 4,记录了一项股票奖励。 2025年10月27日,Seymour 获得了一份 员工购买股票期权,以每股 $8.85 的行使价购买 50,000 股,有效期至 2035年10月27日

该期权在 2026年10月27日25% 上 vest,剩余的基础股票在三次等额年度分期 vest,使所有股票在 2029年10月27日 全部 vest。申报将衍生证券的所有权列为 直接(D),在报告的交易后 持有50,000份衍生证券,具有经济利益

SEC Form 4
FORM 4 UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

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: 3235-0287
Estimated average burden
hours per response: 0.5
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.
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. Issuer Name and Ticker or Trading Symbol
Cartesian Therapeutics, Inc. [ RNAC ]
5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
Director 10% Owner
X Officer (give title below) Other (specify below)
Chief Accounting Officer
3. Date of Earliest Transaction (Month/Day/Year)
10/27/2025
4. 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 Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V Amount (A) or (D) Price
Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 6. Date Exercisable and Expiration Date (Month/Day/Year) 7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Employee Stock Option (right to buy) $8.85 10/27/2025 A 50,000 (1) 10/27/2035 Common Stock 50,000 $0 50,000 D
Explanation of Responses:
1. This option vests as to 25% on October 27, 2026. The remainder of the underlying shares will vest in three equal annual installments thereafter so that the underlying shares will be fully vested on October 27, 2029.
Remarks:
/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 4 (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.
Cartesian

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230.12M
10.42M
59.85%
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9.09%
Biotechnology
Pharmaceutical Preparations
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United States
FREDERICK