STOCK TITAN

[Form 4] Day One Biopharmaceuticals, Inc. Insider Trading Activity

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

Lauren Merendino, Chief Commercial Officer of Day One Biopharmaceuticals, Inc. (DAWN), reported receipt and partial sale of company shares tied to vested restricted stock units (RSUs). On 08/15/2025 she was treated as acquiring multiple blocks of common stock through vesting of RSUs (3,162; 3,687; 3,687 shares) and the related derivative entries show those RSUs underlie the same share amounts. Following these transactions her reported beneficial ownership figures adjusted across several lines, and on 08/18/2025 she sold 3,766 shares in a block trade at a weighted average price of $6.7671 to cover taxes on RSU settlement.

The filing notes the RSUs represent one share each upon settlement for no consideration, vesting schedules (initial 1/4 on 08/15/2024 with remaining quarterly vesting, and separate 1/16 quarterly vesting for another award) and that RSU sales were solely to cover tax liabilities. The form was filed by one reporting person via attorney-in-fact.

Lauren Merendino, Chief Commercial Officer di Day One Biopharmaceuticals, Inc. (DAWN), ha comunicato l'acquisto figurativo e la parziale vendita di azioni della società derivanti dal consolidamento di unità azionarie vincolate (RSU). In data 15/08/2025 è stata considerata come avente acquisito diversi blocchi di azioni ordinarie tramite il vesting di RSU (3.162; 3.687; 3.687 azioni) e le voci correlate mostrano che tali RSU corrispondono agli stessi quantitativi azionari. A seguito di queste operazioni i dati sulla titolarità beneficiaria riportati sono stati rettificati su più righe e il 18/08/2025 ha venduto 3.766 azioni in un unico blocco a un prezzo medio ponderato di $6,7671 per azione per coprire le imposte derivanti dal regolamento delle RSU.

La dichiarazione precisa che ogni RSU si converte in una azione alla liquidazione senza corrispettivo, specifica i piani di vesting (1/4 iniziale il 15/08/2024 con il resto a vesting trimestrale, e un altro premio con vesting trimestrale in quote da 1/16) e che le vendite delle RSU sono state effettuate esclusivamente per il pagamento delle imposte. Il modulo è stato presentato da un unico soggetto dichiarante tramite procuratore.

Lauren Merendino, Chief Commercial Officer de Day One Biopharmaceuticals, Inc. (DAWN), informó la recepción y la venta parcial de acciones de la compañía vinculadas a unidades restringidas de acciones (RSU) adquiridas por vesting. El 15/08/2025 se la consideró como adquirente de varios bloques de acciones ordinarias por el vesting de RSU (3.162; 3.687; 3.687 acciones) y las entradas relacionadas muestran que esas RSU respaldan las mismas cantidades de acciones. Tras estas transacciones, sus cifras de propiedad beneficiaria declaradas se ajustaron en varias líneas, y el 18/08/2025 vendió 3.766 acciones en una operación de bloque a un precio promedio ponderado de $6.7671 para cubrir impuestos por la liquidación de las RSU.

La presentación indica que cada RSU representa una acción al liquidarse sin contraprestación, detalla los calendarios de vesting (1/4 inicial el 15/08/2024 con el resto en vesting trimestral, y un premio separado con vesting trimestral en cuotas de 1/16) y que las ventas de RSU se realizaron únicamente para cubrir obligaciones fiscales. El formulario fue presentado por una sola persona informante a través de un apoderado.

Lauren Merendino, Day One Biopharmaceuticals, Inc. (DAWN) 최고상업책임자(Chief Commercial Officer)는 제한주식단위(RSU)의 베스팅으로 인한 주식 수령 및 일부 매각을 보고했습니다. 2025-08-15에 RSU의 베스팅을 통해 여러 블록의 보통주(3,162; 3,687; 3,687주)를 취득한 것으로 처리되었고, 관련 파생 항목에 동일한 주식 수량을 뒷받침하는 RSU가 표시되어 있습니다. 이러한 거래 이후 보고된 실질 지분 보유 수치는 여러 항목에서 조정되었고, 2025-08-18에는 RSU 정산에 따른 세금 부담을 충당하기 위해 가중평균가격 $6.7671로 3,766주를 블록 거래로 매도했습니다.

신고서에는 각 RSU가 정산 시 대가 없이 1주로 전환된다는 점, 베스팅 일정(2024-08-15에 초기 1/4 베스팅 후 잔여분은 분기별 베스팅, 그리고 별도 수여분은 분기별 1/16 단위 베스팅)과 RSU 매각이 세금 부담 충당을 위해서만 이루어졌다는 점이 명시되어 있습니다. 해당 서류는 단일 신고인이 대리인을 통해 제출했습니다.

Lauren Merendino, Chief Commercial Officer de Day One Biopharmaceuticals, Inc. (DAWN), a déclaré la réception et la vente partielle d'actions de la société liées à des unités d'actions restreintes (RSU) devenues acquises. Le 15/08/2025, elle a été traitée comme ayant acquis plusieurs blocs d'actions ordinaires via le vesting de RSU (3 162 ; 3 687 ; 3 687 actions) et les entrées dérivées correspondantes indiquent que ces RSU sous-tendent les mêmes quantités d'actions. Suite à ces opérations, ses chiffres de propriété bénéficiaire déclarés ont été ajustés sur plusieurs lignes, et le 18/08/2025 elle a vendu 3 766 actions en une transaction de bloc au prix moyen pondéré de 6,7671 $ afin de couvrir les impôts liés au règlement des RSU.

Le dépôt précise que chaque RSU représente une action à la liquidation sans contrepartie, détaille les calendriers de vesting (1/4 initial le 15/08/2024 puis vesting trimestriel pour le solde, et une autre attribution avec vesting trimestriel par tranches de 1/16) et que les ventes de RSU ont été réalisées uniquement pour couvrir des obligations fiscales. Le formulaire a été déposé par une seule personne déclarante via un mandataire.

Lauren Merendino, Chief Commercial Officer von Day One Biopharmaceuticals, Inc. (DAWN), meldete den Erhalt und den teilweisen Verkauf von Unternehmensanteilen, die mit dem Vesting von Restricted Stock Units (RSUs) verbunden sind. Am 15.08.2025 wurde sie als Erwerberin mehrerer Aktienblöcke durch das Vesting von RSUs geführt (3.162; 3.687; 3.687 Aktien), und die zugehörigen Derivateinträge weisen dieselben Aktienmengen den RSUs zu. Infolge dieser Transaktionen wurden ihre gemeldeten wirtschaftlichen Eigentumsangaben in mehreren Zeilen angepasst, und am 18.08.2025 verkaufte sie 3.766 Aktien in einem Blockgeschäft zu einem gewogenen Durchschnittspreis von $6,7671, um Steuern aus der RSU-Abrechnung zu begleichen.

Die Einreichung weist darauf hin, dass jede RSU bei Abrechnung ohne Gegenleistung in eine Aktie umgewandelt wird, nennt die Vesting-Zeitpläne (anfänglich 1/4 am 15.08.2024 mit restlichem quartalsweisem Vesting sowie ein separater Zuschuss mit quartalsweisem Vesting in 1/16-Schritten) und dass die RSU-Verkäufe ausschließlich zur Deckung von Steuerverpflichtungen erfolgten. Das Formular wurde von einer meldenden Person per Bevollmächtigten eingereicht.

Positive
  • Transparent disclosure of RSU vesting schedules, share counts, and purpose of sale (tax withholding).
  • Sells only to cover tax liability rather than broader liquidation of holdings, per the filer.
Negative
  • None.

Insights

TL;DR Officer vested RSUs and sold shares to cover taxes; routine equity-compensation activity with no new cash purchases or unusual dilution.

The report documents standard settlement of RSUs and a follow-on sale of 3,766 shares at a weighted average of $6.7671 for tax withholding. Vesting schedules are disclosed and RSUs are exercisable into common stock for no consideration. Transactions were block trades executed across a price range and the filer used an attorney-in-fact to submit the Form 4.

TL;DR Disclosure aligns with Section 16 reporting obligations; activity appears administrative rather than material to operations.

The Form 4 provides required detail: role of reporting person (Chief Commercial Officer), exact RSU vesting mechanics, number of shares acquired via RSU settlement, and a tax-cover sale. No evidence in this filing of changes in control, new equity grants beyond the described vesting, or related-party transactions that would raise additional governance concerns.

Lauren Merendino, Chief Commercial Officer di Day One Biopharmaceuticals, Inc. (DAWN), ha comunicato l'acquisto figurativo e la parziale vendita di azioni della società derivanti dal consolidamento di unità azionarie vincolate (RSU). In data 15/08/2025 è stata considerata come avente acquisito diversi blocchi di azioni ordinarie tramite il vesting di RSU (3.162; 3.687; 3.687 azioni) e le voci correlate mostrano che tali RSU corrispondono agli stessi quantitativi azionari. A seguito di queste operazioni i dati sulla titolarità beneficiaria riportati sono stati rettificati su più righe e il 18/08/2025 ha venduto 3.766 azioni in un unico blocco a un prezzo medio ponderato di $6,7671 per azione per coprire le imposte derivanti dal regolamento delle RSU.

La dichiarazione precisa che ogni RSU si converte in una azione alla liquidazione senza corrispettivo, specifica i piani di vesting (1/4 iniziale il 15/08/2024 con il resto a vesting trimestrale, e un altro premio con vesting trimestrale in quote da 1/16) e che le vendite delle RSU sono state effettuate esclusivamente per il pagamento delle imposte. Il modulo è stato presentato da un unico soggetto dichiarante tramite procuratore.

Lauren Merendino, Chief Commercial Officer de Day One Biopharmaceuticals, Inc. (DAWN), informó la recepción y la venta parcial de acciones de la compañía vinculadas a unidades restringidas de acciones (RSU) adquiridas por vesting. El 15/08/2025 se la consideró como adquirente de varios bloques de acciones ordinarias por el vesting de RSU (3.162; 3.687; 3.687 acciones) y las entradas relacionadas muestran que esas RSU respaldan las mismas cantidades de acciones. Tras estas transacciones, sus cifras de propiedad beneficiaria declaradas se ajustaron en varias líneas, y el 18/08/2025 vendió 3.766 acciones en una operación de bloque a un precio promedio ponderado de $6.7671 para cubrir impuestos por la liquidación de las RSU.

La presentación indica que cada RSU representa una acción al liquidarse sin contraprestación, detalla los calendarios de vesting (1/4 inicial el 15/08/2024 con el resto en vesting trimestral, y un premio separado con vesting trimestral en cuotas de 1/16) y que las ventas de RSU se realizaron únicamente para cubrir obligaciones fiscales. El formulario fue presentado por una sola persona informante a través de un apoderado.

Lauren Merendino, Day One Biopharmaceuticals, Inc. (DAWN) 최고상업책임자(Chief Commercial Officer)는 제한주식단위(RSU)의 베스팅으로 인한 주식 수령 및 일부 매각을 보고했습니다. 2025-08-15에 RSU의 베스팅을 통해 여러 블록의 보통주(3,162; 3,687; 3,687주)를 취득한 것으로 처리되었고, 관련 파생 항목에 동일한 주식 수량을 뒷받침하는 RSU가 표시되어 있습니다. 이러한 거래 이후 보고된 실질 지분 보유 수치는 여러 항목에서 조정되었고, 2025-08-18에는 RSU 정산에 따른 세금 부담을 충당하기 위해 가중평균가격 $6.7671로 3,766주를 블록 거래로 매도했습니다.

신고서에는 각 RSU가 정산 시 대가 없이 1주로 전환된다는 점, 베스팅 일정(2024-08-15에 초기 1/4 베스팅 후 잔여분은 분기별 베스팅, 그리고 별도 수여분은 분기별 1/16 단위 베스팅)과 RSU 매각이 세금 부담 충당을 위해서만 이루어졌다는 점이 명시되어 있습니다. 해당 서류는 단일 신고인이 대리인을 통해 제출했습니다.

Lauren Merendino, Chief Commercial Officer de Day One Biopharmaceuticals, Inc. (DAWN), a déclaré la réception et la vente partielle d'actions de la société liées à des unités d'actions restreintes (RSU) devenues acquises. Le 15/08/2025, elle a été traitée comme ayant acquis plusieurs blocs d'actions ordinaires via le vesting de RSU (3 162 ; 3 687 ; 3 687 actions) et les entrées dérivées correspondantes indiquent que ces RSU sous-tendent les mêmes quantités d'actions. Suite à ces opérations, ses chiffres de propriété bénéficiaire déclarés ont été ajustés sur plusieurs lignes, et le 18/08/2025 elle a vendu 3 766 actions en une transaction de bloc au prix moyen pondéré de 6,7671 $ afin de couvrir les impôts liés au règlement des RSU.

Le dépôt précise que chaque RSU représente une action à la liquidation sans contrepartie, détaille les calendriers de vesting (1/4 initial le 15/08/2024 puis vesting trimestriel pour le solde, et une autre attribution avec vesting trimestriel par tranches de 1/16) et que les ventes de RSU ont été réalisées uniquement pour couvrir des obligations fiscales. Le formulaire a été déposé par une seule personne déclarante via un mandataire.

Lauren Merendino, Chief Commercial Officer von Day One Biopharmaceuticals, Inc. (DAWN), meldete den Erhalt und den teilweisen Verkauf von Unternehmensanteilen, die mit dem Vesting von Restricted Stock Units (RSUs) verbunden sind. Am 15.08.2025 wurde sie als Erwerberin mehrerer Aktienblöcke durch das Vesting von RSUs geführt (3.162; 3.687; 3.687 Aktien), und die zugehörigen Derivateinträge weisen dieselben Aktienmengen den RSUs zu. Infolge dieser Transaktionen wurden ihre gemeldeten wirtschaftlichen Eigentumsangaben in mehreren Zeilen angepasst, und am 18.08.2025 verkaufte sie 3.766 Aktien in einem Blockgeschäft zu einem gewogenen Durchschnittspreis von $6,7671, um Steuern aus der RSU-Abrechnung zu begleichen.

Die Einreichung weist darauf hin, dass jede RSU bei Abrechnung ohne Gegenleistung in eine Aktie umgewandelt wird, nennt die Vesting-Zeitpläne (anfänglich 1/4 am 15.08.2024 mit restlichem quartalsweisem Vesting sowie ein separater Zuschuss mit quartalsweisem Vesting in 1/16-Schritten) und dass die RSU-Verkäufe ausschließlich zur Deckung von Steuerverpflichtungen erfolgten. Das Formular wurde von einer meldenden Person per Bevollmächtigten eingereicht.

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*
Merendino Lauren

(Last) (First) (Middle)
1800 SIERRA POINT PARKWAY, SUITE 200

(Street)
BRISBANE CA 94005

(City) (State) (Zip)
2. Issuer Name and Ticker or Trading Symbol
Day One Biopharmaceuticals, Inc. [ DAWN ]
5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
Director 10% Owner
X Officer (give title below) Other (specify below)
Chief Commercial Officer
3. Date of Earliest Transaction (Month/Day/Year)
08/15/2025
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 08/15/2025 M 3,162 A (1) 38,323 D
Common Stock 08/15/2025 M 3,687 A (1) 42,010 D
Common Stock 08/15/2025 M 3,687 A (1) 45,697 D
Common Stock 08/18/2025 S(2) 3,766 D $6.7671(3) 41,931 D
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
Restricted Stock Unit (RSU) (1) 08/15/2025 M 3,162 (4) (5) Common Stock 3,162 $0 25,302 D
Restricted Stock Unit (RSU) (1) 08/15/2025 M 3,687 (6) (5) Common Stock 3,687 $0 33,191 D
Restricted Stock Unit (RSU) (1) 08/15/2025 M 3,687 (6) (5) Common Stock 3,687 $0 47,939 D
Explanation of Responses:
1. Each Restricted Stock Unit ("RSU") represents a contingent right to receive one share of the Issuer's Common Stock upon settlement for no consideration.
2. The sale of shares is for the sole purpose of covering the Reporting Person's tax liability with respect to the settlement of RSUs.
3. The price reported in Column 4 is a weighted average price. These shares were sold as part of block trades for multiple security holders of the Issuer at prices ranging from $6.65 to $6.87, inclusive. The Reporting Person undertakes to provide to the Issuer, any securityholder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth herein with regard to the block trade.
4. The RSUs vested as to 1/4th of the total award on August 15, 2024, and the remaining 3/4 of the award vests in 12 substantially equal quarterly installments thereafter on November 15, February 15, May 15 and August 15, subject to the Reporting Person's provision of service to the Issuer on each vesting date.
5. RSUs do not expire; they either vest or are canceled prior to the vesting date.
6. The RSUs vest as to 1/16th of the total award in quarterly installments on February 15, May 15, August 15 and November 15, subject to the Reporting Person's provision of service to the Issuer on each vesting date.
/s/ Charles N. York II, as Attorney-in-Fact 08/19/2025
** 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

Who filed the Form 4 for DAWN and what is their role?

The Form 4 was filed for Lauren Merendino, who is identified as the company's Chief Commercial Officer.

What transactions were reported on the Form 4 for DAWN?

The filing reports settlement/vestings of RSUs on 08/15/2025 converting into common stock (3,162; 3,687; 3,687 shares) and a sale of 3,766 shares on 08/18/2025.

At what price were the shares sold and why were they sold?

The shares sold on 08/18/2025 were part of block trades at a weighted average price of $6.7671 to cover the reporting person's tax liability on RSU settlement.

What do the RSUs represent and when do they vest?

Each RSU represents a contingent right to one share of common stock for no consideration; one award vested 1/4 on 08/15/2024 with the remainder vesting quarterly, and another vests in 1/16th quarterly installments as described.

Was this Form 4 filed individually or jointly?

The form was filed by one reporting person and signed by an attorney-in-fact on behalf of the reporting person.
Day One Biopharmaceuticals, Inc.

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Biotechnology
Pharmaceutical Preparations
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United States
BRISBANE