Julie Papanek Grant - May 26, 2021 Form 3 Insider Report for Day One Biopharmaceuticals, Inc. (DAWN)

Role: Chair of the Board
Signature: /s/ Julie Grant
Stock symbol: DAWN
Transactions as of: May 26, 2021
Transactions value $: $0
Form type: 3
Date filed: 5/26/2021, 09:38 PM
Previous filing: Jun 2, 2021
Next filing: Jul 12, 2022

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
holding	DAWN	Common Stock						465K	May 26, 2021	Direct
holding	DAWN	Common Stock						3.25M	May 26, 2021	By Canaan XI, L.P.	F1

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
holding	DAWN	Series A Preferred Stock							May 26, 2021	Common Stock	7.33M		By Canaan XI, L.P.	F1, F2
holding	DAWN	Series B Preferred Stock							May 26, 2021	Common Stock	148K		By Canaan XI, L.P.	F1, F3
holding	DAWN	Stock Option (right to buy Common Stock)							May 26, 2021	Common Stock	63K	$16.00	Direct	F4

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	Represents securities held by Canaan XI, L.P. ("Canaan LP"). The Reporting Person, as a non-managing member of Canaan LP's general partner, Canaan Partners XI LLC, disclaims Section 16 beneficial ownership of such securities except to the extent of her pecuniary interest therein, if any.
F2	Each share of Series A Preferred Stock is automatically convertible into one share of Common Stock at the close of the Issuer's initial public offering and has no expiration date.
F3	Each share of Series B Preferred Stock is automatically convertible into one share of Common Stock at the close of the Issuer's initial public offering and has no expiration date.
F4	The option vests as to 1/36th of the total shares on each monthly anniversary, beginning on June 23, 2021, subject to the Reporting Person's provision of service to the Issuer on each vesting date.