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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	Director	Officer	Large Shareholder	Other
1326628	Len Blavatnik	C/O Access Industries, Inc. 40 West 57Th Street, 28Th Fl New York NY 10019	No	No	No	Yes
1391297	Access Industries Holdings Llc	C/O Access Industries, Inc. 40 West 57Th Street, 28Th Fl New York NY 10019	No	No	No	Yes
1508226	Access Industries Management, Llc	C/O Access Industries, Inc. 40 West 57Th Street, 28Th Floor New York NY 10019	No	No	No	Yes
1863302	Ai Day1 Llc	C/O Access Industries, Inc. 40 West 57Th Street, 28Th Floor New York NY 10019	No	No	Yes	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	2023-06-09	769,230	$13.00	11,453,868	No	4	P	Direct

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

Footnotes

The securities reported are held directly by AI Day1 LLC and may be deemed to be beneficially owned by Access Industries Holdings LLC ("AIH"), Access Industries Management, LLC ("AIM") and Len Blavatnik because AIH indirectly controls all of the outstanding voting interests in AI Day1 LLC, AIM controls AIH and Mr. Blavatnik controls AIM and controls a majority of the outstanding voting interests in AIH. AIH, AIM and Mr. Blavatnik each disclaims beneficial ownership of these securities, except to the extent of its or his pecuniary interest therein, and this form shall not be construed as an admission that any such reporting person is the beneficial owner of any of the securities reported on this form.