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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1845337	Day One Biopharmaceuticals Inc.	DAWN	()	4

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1655962	Ii N Charles York	2000 Sierra Point Parkway, Suite 501 Brisbane CA 94080	Coo, Cfo And Secretary	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	2022-11-15	1,375	$0.00	295,776	No	4	M	Direct
Common Stock	Disposition	2022-11-16	430	$21.46	296,497	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	2022-11-15	1,375	$0.00	1,375	$0.00

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
16,500			No	4	M	Direct

Footnotes

Each Restricted Stock Unit ("RSU") represents a contingent right to receive one share of the Issuer's Common Stock upon settlement for no consideration.
The sale of shares is for the sole purpose of covering the Reporting Person's tax liability with respect to the settlement of RSUs.
Includes 1,151 shares of Common Stock acquired under the Issuer's employee stock purchase plan on November 16, 2022.
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.