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$DAWN All transactions

Day One Biopharmaceuticals, Inc.

D

$ Value

$0

Shares

90,000

Price

$0

Filed

Nov 7

Insider

Name

Merendino Lauren

Title

Chief Commercial Officer

CIK

0001855298

Roles

Officer

Transaction Details

Transaction Date

2025-11-06

Code

D

Table

Derivative

Ownership

Direct

Equity Swap

No

Shares After

Footnotes

On October 7, 2025, the Issuer's Board of Directors approved an option repricing (the "Repricing") whereby the Reporting Person's options were repriced on November 6, 2025 (the "Effective Date") with a new exercise price of $8.99 (if lower than the original exercise price), the closing price on Nasdaq as of the Effective Date. In order to exercise the repriced options at the new exercise price, the Reporting Person is required to remain in service with the Issuer through the Retention Period; provided that the additional premium payment will not be required if the Reporting Person's service to the Issuer is terminated by reason of death or Disability (as defined in the Company's 2021 Equity Incentive Plan ("the Plan")). | (Continued from Footnote 1) The "Retention Period" commenced on the Effective Date and ends upon the earliest of (i) the 12-month anniversary of the Effective Date and (ii) a Corporate Transaction (as defined in the Plan). All of the other terms of the options remain unchanged. Such transactions were exempt pursuant to Rule 16b-6(d) and Rule 16b-3 of the Exchange Act, as applicable. | The option vests as to 25% of the total shares on June 12, 2024 and then 2.0833% of the total shares vest monthly thereafter, with 100% of the total shares vested on June 12, 2027, subject to the Reporting Person's provision of service to the Issuer on each vesting date. | The option vests as to 1/48th of the total shares monthly, commencing February 5, 2024, subject to the Reporting Person's provision of service to the Issuer on each vesting date. | The option vests as to 1/48th of the total shares monthly, commencing February 15, 2025, subject to the Reporting Person's provision of service to the Issuer on each vesting date.

Filing Info

Accession No.

0001855298-25-000005

Form Type

4

Issuer CIK

0001845337

Merendino Lauren's History

Date Ticker Type Value
2026-04-23 DAWN D
2026-04-23 DAWN D
2026-04-23 DAWN D
2026-04-23 DAWN D
2026-04-23 DAWN D
2026-04-23 DAWN D
2026-04-23 DAWN D
2026-04-23 DAWN D
2026-04-23 DAWN D
2026-02-17 DAWN $67K

Other Insiders at DAWN (90d)

Insider Bought Sold Last
Garland J. Scott 2026-04-23
Ramasastry Saira 2026-04-23
Holles Natalie C. 2026-04-23
Nicholson Garry A 2026-04-23
York Charles N II
COO and CFO
$70K 2026-04-23
Dable Habib J 2026-04-23
Grossman William 2026-04-23
VASCONCELLES MICHAEL
Head of Research and Dev.
$32K 2026-04-23
Dubow Adam
Gen Counsel & Secretary
$74K 2026-04-23
Josey John A. 2026-04-23
Merendino Lauren
Chief Commercial Officer
$67K 2026-04-23
Bender Jeremy
CHIEF EXECUTIVE OFFICER
$179K 2026-04-23