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Filing Details

Accession Number:: 0001209191-23-001275
Form Type:: 4
Zero Holdings:: No
Publication Time:: 2023-01-04 17:51:49
Reporting Period:: 2023-01-03

Accepted Time:: 2023-01-04 17:51:49
SEC Url:: Form 4 Filing

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
1673237	Papanek Julie Grant	2000 Sierra Point Parkway, Suite 501 Brisbane CA 94080		Yes	No	No	No

Reported Non-Derivative Transactions

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Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock	Disposition	2023-01-03	17,390	$20.36	387,610	No	4	S	Indirect	See Footnote
Common Stock	Disposition	2023-01-03	7,610	$21.31	380,000	No	4	S	Indirect	See Footnote

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	S	Indirect	See Footnote
No	4	S	Indirect	See Footnote

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Common Stock	2,358	Indirect	See Footnote
Common Stock	2,548,403	Indirect	See Footnote

Footnotes

The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on September 22, 2022.
The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $19.95 to $20.92 per share, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder 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 in this footnote.
Represents shares held by The Grant Family Delaware Trust Agreement of which the Reporting Person is trustee. The Reporting Person disclaims beneficial ownership of the shares except to the extent of her pecuniary interest therein, if any, and this report shall not be deemed an admission that the Reporting Person is the beneficial owner of the shares for purposes of Section 16 of the Securities Exchange Act of 1934, as amended (the "Act"), or for any other purpose.
The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $20.98 to $21.81 per share, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder 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 in this footnote.
Represents shares held by The Adam and Julie Grant Revocable Trust dtd October 13, 2017 of which the Reporting Person and her spouse are co-trustees. The Reporting Person disclaims beneficial ownership of the shares except to the extent of her pecuniary interest therein, if any, and this report shall not be deemed an admission that the Reporting Person is the beneficial owner of the shares for purposes of Section 16 of the Act, or for any other purpose.
Represents shares held by Canaan XI L.P. The Reporting Person is a non-managing member of Canaan Partners XI LLC, the general partner of Canaan XI L.P. The Reporting Person does not have voting or dispositive power over any of the shares held directly by Canaan XI L.P. and disclaims beneficial ownership of the shares except to the extent of her pecuniary interest therein, if any, and this report shall not be deemed an admission that the Reporting Person is the beneficial owner of the shares for purposes of Section 16 of the Act, or for any other purpose.