STOCK TITAN

[Form 4] Gossamer Bio, Inc. Insider Trading Activity

Filing Impact
(Low)
Filing Sentiment
(Neutral)
Form Type
4

Richard Aranda, Chief Medical Officer of Gossamer Bio, Inc. (GOSS), reported receiving a performance stock unit award of 162,500 common stock units on 10/01/2025. The award carries a $0 purchase price and will vest in full upon the earlier of (i) approval of a new drug application for seralutinib or (ii) a change in control, provided vesting occurs on or before the fourth anniversary of the grant date and subject to the reporting person’s continuous service. After the reported transaction, the filing shows 369,356 shares beneficially owned directly and 2,539 shares beneficially owned indirectly through a family trust. The filing was signed by an attorney-in-fact on 10/02/2025.

Richard Aranda, Chief Medical Officer di Gossamer Bio, Inc. (GOSS), ha riferito di aver ricevuto un premio di unità azionarie di performance pari a 162.500 unità di azioni ordinarie in data 10/01/2025. Il premio ha un prezzo di esercizio di 0 dollari e si VESTERÀ interamente al verificarsi della più vicina tra (i) l’approvazione di una domanda di nuovo farmaco per seralutinib o (ii) un cambio di controllo, a condizione che la vestizione avvenga entro il quarto anniversario della data di concessione e soggetta al continuo servizio della persona riportante. Dopo la transazione riportata, la documentazione mostra 369.356 azioni possedute direttamente e 2.539 azioni possedute indirettamente tramite un trust familiare. La documentazione è stata firmata da un procuratore in fact il 10/02/2025.

Richard Aranda, Director médico jefe de Gossamer Bio, Inc. (GOSS), informó haber recibido una asignación de unidades de stock de rendimiento por un total de 162.500 unidades de acciones ordinarias el 01/10/2025. La asignación tiene un precio de ejercicio de 0 dólares y vencerá por completo en el momento más temprano entre (i) la aprobación de una solicitud de un nuevo fármaco para seralutinib o (ii) un cambio de control, siempre que la vesting ocurra en o antes del cuarto aniversario de la fecha de concesión y sujeto al servicio continuo de la persona que reporta. Después de la transacción reportada, la presentación muestra 369.356 acciones poseídas directamente y 2.539 acciones poseídas indirectamente a través de un fideicomiso familiar. La presentación fue firmada por un apoderado en funciones el 10/02/2025.

Richard Aranda, Gossamer Bio, Inc. (GOSS)의 최고 의료 책임자, 2025년 10월 1일162,500 주의 보통주 단위 성과 주를 수령했다고 보고했습니다. 이 보상은 0 달러의 행사 가격을 가지며, 더 이른 시점인 (i) seralutinib에 대한 새로운 약물 신청의 승인 또는 (ii) 지배권 변경이 발생할 때 전부가 취득되며, 부여일로부터 4주년 이내에 vesting이 이루어지고 보고 대상자의 지속적인 서비스가 전제됩니다. 보고된 거래 후, 제출서는 직접 보유한 주식 369,356주와 가족 신탁을 통해 간접 보유한 2,539주를 보여줍니다. 제출서는 2025년 10월 2일에 대리인에 의해 서명되었습니다.

Richard Aranda, Directeur médical chez Gossamer Bio, Inc. (GOSS), a déclaré avoir reçu une attribution de stock de performance équivalant à 162 500 unités d’actions ordinaires le 01/10/2025. Le prix d’exercice est de 0 $ et l’acquisition vestira intégralement à la survenue de la plus proche des événements suivants : (i) l’approbation d’une nouvelle demande thérapeutique pour seralutinib ou (ii) un changement de contrôle, sous réserve que l’acquisition intervienne au plus tard quatre ans après la date de concession et sous réserve de la continuité du service de la personne qui déclare. Après la transaction déclarée, le dossier montre 369 356 actions détenues directement et 2 539 actions détenues indirectement par le biais d’un trust familial. Le dossier a été signé par une procuration le 02/10/2025.

Richard Aranda, Chief Medical Officer von Gossamer Bio, Inc. (GOSS), meldete den Erhalt einer Leistungs-Stock-Unit-Zuweisung in Höhe von 162.500 Stammaktien-Einheiten am 01.10.2025. Die Zuweisung hat einen Ausübungspreis von 0 USD und wird vollständig vesten, sobald entweder (i) die Zulassung eines neuen Arzneimittels für seralutinib erfolgt oder (ii) eine Änderung der Kontrolle eintritt, vorausgesetzt, das Vesting erfolgt vor oder am vierten Jahrestag des Gewährungsdatums und unter der Bedingung der fortlaufenden Dienstleistung der meldenden Person. Nach der gemeldeten Transaktion zeigt die Einreichung direkt 369.356 Aktien und indirekt 2.539 Aktien, die durch einen Familientrust gehalten werden. Die Einreichung wurde am 02.10.2025 von einem Bevollmächtigten unterzeichnet.

Richard Aranda، كبير مسؤولي الطب في Gossamer Bio, Inc. (GOSS)، أبلغ عن تلقيه جائزة وحدات أسهم أداء تبلغ 162,500 وحدة من الأسهم العادية في تاريخ 01/10/2025. تحوي الجائزة سعر شراء قدره 0 دولار وستُكتسب بالكامل عند أقرب حدثين: (i) الموافقة على طلب دواء جديد لـ seralutinib أو (ii) تغير في الملكية، مع شرط أن يحدث الاستحقاق خلال السنة الرابعة من تاريخ المنح وتحت شرط الخدمة المستمرة للشخص المبلغ. بعد الصفقة المبلغ عنها، تُظهر الإيداع 369,356 سهماً مملوكاً مباشرة و2,539 سهماً مملوكاً بشكل غير مباشر من خلال صندوق عائلي. تم توقيع الإيداع من قبل وكيل قانوني في التاريخ 02/10/2025.

Richard Aranda,Gossamer Bio, Inc.(GOSS)的首席医疗官,报告于 2025/10/01 收到 162,500 股普通股单位的绩效股票单位奖励。该奖励的行权价为 0 美元,将于更早发生的情况全额归属: (i) 针对 seralutinib 的新药申请获得批准,或 (ii) 控股权变动,前提是在授予日后的第四周年之内并且以报告人持续服务为前提。在报道交易之后,备案显示直接持有 369,356 股,间接通过一个家族信托持有 2,539 股。备案于 2025/10/02 由授权代理人签署。

Positive
  • 162,500 performance stock units awarded, vesting upon NDA approval for seralutinib or a change in control
  • Award vests within a defined four-year window, linking compensation to a material milestone
  • Post-transaction beneficial ownership explicitly stated: 369,356 direct and 2,539 indirect shares
Negative
  • None.

Insights

Insider awarded 162,500 performance stock units tied to seralutinib approval or change in control.

The award is structured as performance stock units with vesting contingent on a regulatory milestone (NDA approval for seralutinib) or a corporate transaction, and it must vest within four years. This ties executive compensation directly to a specific product outcome and an exit event.

The filing discloses post-transaction beneficial ownership of 369,356 shares directly and 2,539 indirectly, providing a clear view of the reporting person’s current stake.

Richard Aranda, Chief Medical Officer di Gossamer Bio, Inc. (GOSS), ha riferito di aver ricevuto un premio di unità azionarie di performance pari a 162.500 unità di azioni ordinarie in data 10/01/2025. Il premio ha un prezzo di esercizio di 0 dollari e si VESTERÀ interamente al verificarsi della più vicina tra (i) l’approvazione di una domanda di nuovo farmaco per seralutinib o (ii) un cambio di controllo, a condizione che la vestizione avvenga entro il quarto anniversario della data di concessione e soggetta al continuo servizio della persona riportante. Dopo la transazione riportata, la documentazione mostra 369.356 azioni possedute direttamente e 2.539 azioni possedute indirettamente tramite un trust familiare. La documentazione è stata firmata da un procuratore in fact il 10/02/2025.

Richard Aranda, Director médico jefe de Gossamer Bio, Inc. (GOSS), informó haber recibido una asignación de unidades de stock de rendimiento por un total de 162.500 unidades de acciones ordinarias el 01/10/2025. La asignación tiene un precio de ejercicio de 0 dólares y vencerá por completo en el momento más temprano entre (i) la aprobación de una solicitud de un nuevo fármaco para seralutinib o (ii) un cambio de control, siempre que la vesting ocurra en o antes del cuarto aniversario de la fecha de concesión y sujeto al servicio continuo de la persona que reporta. Después de la transacción reportada, la presentación muestra 369.356 acciones poseídas directamente y 2.539 acciones poseídas indirectamente a través de un fideicomiso familiar. La presentación fue firmada por un apoderado en funciones el 10/02/2025.

Richard Aranda, Gossamer Bio, Inc. (GOSS)의 최고 의료 책임자, 2025년 10월 1일162,500 주의 보통주 단위 성과 주를 수령했다고 보고했습니다. 이 보상은 0 달러의 행사 가격을 가지며, 더 이른 시점인 (i) seralutinib에 대한 새로운 약물 신청의 승인 또는 (ii) 지배권 변경이 발생할 때 전부가 취득되며, 부여일로부터 4주년 이내에 vesting이 이루어지고 보고 대상자의 지속적인 서비스가 전제됩니다. 보고된 거래 후, 제출서는 직접 보유한 주식 369,356주와 가족 신탁을 통해 간접 보유한 2,539주를 보여줍니다. 제출서는 2025년 10월 2일에 대리인에 의해 서명되었습니다.

Richard Aranda, Directeur médical chez Gossamer Bio, Inc. (GOSS), a déclaré avoir reçu une attribution de stock de performance équivalant à 162 500 unités d’actions ordinaires le 01/10/2025. Le prix d’exercice est de 0 $ et l’acquisition vestira intégralement à la survenue de la plus proche des événements suivants : (i) l’approbation d’une nouvelle demande thérapeutique pour seralutinib ou (ii) un changement de contrôle, sous réserve que l’acquisition intervienne au plus tard quatre ans après la date de concession et sous réserve de la continuité du service de la personne qui déclare. Après la transaction déclarée, le dossier montre 369 356 actions détenues directement et 2 539 actions détenues indirectement par le biais d’un trust familial. Le dossier a été signé par une procuration le 02/10/2025.

Richard Aranda, Chief Medical Officer von Gossamer Bio, Inc. (GOSS), meldete den Erhalt einer Leistungs-Stock-Unit-Zuweisung in Höhe von 162.500 Stammaktien-Einheiten am 01.10.2025. Die Zuweisung hat einen Ausübungspreis von 0 USD und wird vollständig vesten, sobald entweder (i) die Zulassung eines neuen Arzneimittels für seralutinib erfolgt oder (ii) eine Änderung der Kontrolle eintritt, vorausgesetzt, das Vesting erfolgt vor oder am vierten Jahrestag des Gewährungsdatums und unter der Bedingung der fortlaufenden Dienstleistung der meldenden Person. Nach der gemeldeten Transaktion zeigt die Einreichung direkt 369.356 Aktien und indirekt 2.539 Aktien, die durch einen Familientrust gehalten werden. Die Einreichung wurde am 02.10.2025 von einem Bevollmächtigten unterzeichnet.

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).
1. Name and Address of Reporting Person*
Aranda Richard

(Last) (First) (Middle)
3115 MERRYFIELD ROW, SUITE 120

(Street)
SAN DIEGO CA 92121

(City) (State) (Zip)
2. Issuer Name and Ticker or Trading Symbol
Gossamer Bio, Inc. [ GOSS ]
5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
Director 10% Owner
X Officer (give title below) Other (specify below)
Chief Medical Officer
3. Date of Earliest Transaction (Month/Day/Year)
10/01/2025
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
Common Stock 10/01/2025 A 162,500(1) A $0 369,356 D
Common Stock 2,539 I By family trust
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
Explanation of Responses:
1. Represents performance stock unit award, which will vest in full upon the earlier of (i) the approval of a new drug application for seralutinib or (ii) a change in control, in either case on or prior to the fourth anniversary of the grant date, and subject to the Reporting Person's continuous service to the Issuer.
Remarks:
/s/ Jeff Boerneke, Attorney-in-Fact 10/02/2025
** 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.

FAQ

What transaction did Richard Aranda report on Form 4 for GOSS?

He reported receiving a performance stock unit award of 162,500 common stock units on 10/01/2025 with a $0 price.

What are the vesting conditions for the 162,500 performance stock units?

The units vest in full upon the earlier of (i) approval of a new drug application for seralutinib or (ii) a change in control, on or prior to the fourth anniversary of the grant date, subject to continuous service.

How many shares does the reporting person beneficially own after the transaction?

The filing shows 369,356 shares beneficially owned directly and 2,539 shares beneficially owned indirectly through a family trust.

What price was reported for the granted units?

The Form 4 reports a $0 price for the performance stock unit award.

Who signed the Form 4 filing for the reporting person?

The filing was signed by /s/ Jeff Boerneke, Attorney-in-Fact on 10/02/2025.
Gossamer Bio

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Biotechnology
Pharmaceutical Preparations
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United States
SAN DIEGO