Michael Gladstone - Jun 17, 2022 Form 4 Insider Report for Day One Biopharmaceuticals, Inc. (DAWN)

Role: Director
Signature: /s/ Ommer Chohan, Attorney-in-Fact
Stock symbol: DAWN
Transactions as of: Jun 17, 2022
Transactions value $: $11,500,005
Form type: 4
Date filed: 6/22/2022, 04:47 PM
Previous filing: May 26, 2021
Next filing: Jun 23, 2022

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	DAWN	Common Stock	Purchase	$11.5M	+767K		$15.00	767K	Jun 17, 2022	See Footnote	F1

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

Explanation of Responses:

Id	Content
F1	The shares are owned directly by Atlas Venture Opportunity Fund II, L.P. ("AVOF II"). Atlas Venture Associates Opportunity II, LP ("AVAO II LP") is the general partner of AVOF II. Atlas Venture Associates Opportunity II, LLC ("AVAO II LLC") is the general partner of AVAO II LP. The Reporting Person is a member of AVAO II LLC and disclaims Section 16 beneficial ownership of such securities held by AVOF II, except to the extent of his pecuniary interest therein, if any.

Content

The shares are owned directly by Atlas Venture Opportunity Fund II, L.P. ("AVOF II"). Atlas Venture Associates Opportunity II, LP ("AVAO II LP") is the general partner of AVOF II. Atlas Venture Associates Opportunity II, LLC ("AVAO II LLC") is the general partner of AVAO II LP. The Reporting Person is a member of AVAO II LLC and disclaims Section 16 beneficial ownership of such securities held by AVOF II, except to the extent of his pecuniary interest therein, if any.

Remarks:

Exhibit List - Exhibit 24 - Power of Attorney