Ownership Submission
FORM 4
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Check this box if no longer subject to Section 16, Form 4 or Form 5 obligations may continue. See Instruction 1(b).
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UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549STATEMENT OF CHANGES IN 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
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OMB APPROVAL
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OMB Number:3235-0287Expires:January 31, 2005Estimated average burden hours per response...0.5
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1. Name and Address of Reporting Person *
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Blackman Samuel C.
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2. Issuer Name and Ticker or Trading Symbol
Day One Biopharmaceuticals, Inc. [DAWN]
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5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director
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_____ 10% Owner
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_____ Officer (give title below)
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_____ Other (specify below)
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HEAD OF R&D /
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(Last)
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(First)
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(Middle)
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2000 SIERRA POINT PARKWAY, SUITE 501
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3. Date of Earliest Transaction (Month/Day/Year)
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(Street)
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BRISBANE
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CA
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94005
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4. If Amendment, Date Original Filed(Month/Day/Year)
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6. Individual or Join/Group Filing(Check Applicable Line)
_X_ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person
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Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
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1.Title of Security
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2. Transaction Date (Month/Day/Year)
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2A. Deemed Execution Date, if any (Month/Day/Year)
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3. Transaction Code
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4. Securities Acquired (A) or Disposed of (D)
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5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
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6. Ownership Form: Direct (D) or Indirect (I)
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7. Nature of Indirect Beneficial Ownership
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Code
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V
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Amount
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(A) or (D)
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Price
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Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security
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2. Conversion or Exercise Price of Derivative Security
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3. Transaction Date (Month/Day/Year)
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3A. Deemed Execution Date, if any (Month/Day/Year)
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4. Transaction Code
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5. Number of Derivative Securities Acquired (A) or Disposed of (D)
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6. Date Exercisable and Expiration Date
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7. Title and Amount of Securities Underlying Derivative Security
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8. Price of Derivative Security
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9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s)
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10. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
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11. Nature of Indirect Beneficial Ownership
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Code
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V
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(A)
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(D)
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Date Exercisable
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Expriation Date
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Title
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Amount or Number of Shares
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Reporting Owners
Reporting Owner Name / Address
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Relationships
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Director
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10% Owner
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Officer
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Other
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Blackman Samuel C.
2000 SIERRA POINT PARKWAY, SUITE 501
BRISBANE, CA94005
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HEAD OF R&D
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Signatures
/s/ Charles N. York II, as Attorney-in-Fact
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2024-08-19
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**Signature of Reporting Person
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Date
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Explanation of Responses:
(*)
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If the form is filed by more than one reporting person, see Instruction 5(b)(v).
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(**)
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Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
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(1)
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Each Restricted Stock Unit ("RSU") represents a contingent right to receive one share of the Issuer's Common Stock upon settlement for no consideration.
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(2)
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The sale of shares is for the sole purpose of covering the Reporting Person's tax liability with respect to the settlement of RSUs.
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(3)
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The Reporting Person is the sole manager, and has shared voting and dispositive power with his wife as members. The Reporting Person continues to report beneficial ownership of all of the Issuer's Common Stock held by the 2021 Blackman Family LLC but disclaims beneficial ownership except to the extent of his and his wife's pecuniary interest therein.
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(4)
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The RSUs will 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.
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Note: File three copies of this Form, one of which must be manually signed. If space is insufficient,
See Instruction 6 for procedure.Potential persons who are to respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB number.