Charles N. York II - Aug 15, 2022 Form 4 Insider Report for Day One Biopharmaceuticals, Inc. (DAWN)

Role: COO, CFO and Secretary
Signature: /s/ Charles N. York II
Stock symbol: DAWN
Transactions as of: Aug 15, 2022
Transactions value $: -$26,474
Form type: 4
Date filed: 8/17/2022, 07:23 PM
Previous filing: Aug 5, 2022
Next filing: Sep 6, 2022

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	DAWN	Common Stock	Options Exercise	$0	+4.13K	+1.28%	$0.00	325K	Aug 15, 2022	Direct
transaction	DAWN	Common Stock	Sale	-$26.5K	-1.09K	-0.33%	$24.31	324K	Aug 16, 2022	Direct	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
transaction	DAWN	Restricted Stock Units	Options Exercise	$0	-4.13K	-18.75%	$0.00	17.9K	Aug 15, 2022	Common Stock	4.13K		Direct	F2, F3

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

Explanation of Responses:

Id	Content
F1	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").
F2	Each RSU represents a contingent right to receive one share of the Issuer's Common Stock upon settlement.
F3	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.