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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1845337	Day One Biopharmaceuticals Inc.	DAWN	Pharmaceutical Preparations (2834)	832415215

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1863676	C. Samuel Blackman	395 Oyster Point Blvd, Suite 217 South San Francisco CA 94080	Chief Medical Officer	No	Yes	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock	Acquisiton	2022-08-15	3,561	$0.00	1,300,279	No	4	M	Direct
Common Stock	Disposition	2022-08-16	941	$24.31	1,299,338	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	M	Direct
No	4	S	Direct

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Restricted Stock Units	Disposition	2022-08-15	3,561	$0.00	3,561	$0.00

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
15,439		2032-01-17	No	4	M	Direct

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Common Stock	1,000,000	Indirect	See Footnote

Footnotes

Represents the number of shares required to be sold by the Reporting Person to cover tax withholding obligations in connection with the settlement of restricted stock units ("RSUs").
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.
Each RSU represents a contingent right to receive one share of the Issuer's Common Stock upon settlement.
The RSUs will vest as to 1/12 of the total award in quarterly installments on February 15th, May 15th, August 15th, and November 15th, subject to the Reporting Person's continued service to the Issuer on each vesting date.