Company: DAWN
Filing Date: 2025-03-06
Form Type: 10-K/A
Source: 0000950170-25-034878
Chunk: 4

Company: Day One Biopharmaceuticals, Inc.
Filing Date: 2025-03-06
Form: 10-K/A
Chunk 4
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 conditions, or that the degree of compliance with the policies or procedures may deteriorate.

Management has assessed the effectiveness of our internal control over financial reporting based on the framework set forth by the Committee of Sponsoring Organizations of the Treadway Commission, or COSO, inInternal Control-Integrated Framework (2013 framework). Based on our evaluation, management has concluded that our internal control over financial reporting was effective at the reasonable assurance level as of December 31, 2024.

The effectiveness of our internal control over financial reporting as of December 31, 2024 has been audited byPricewaterhouseCoopers LLP, an independent registered public accounting firm, as stated in their report which appears herein.

Changes in Internal Control over Financial Reporting

There were no changes in our internal control over financial reporting that occurred during the most recent quarter that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

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PART IV

Item 15. Exhibits, Financial Statement Schedules.

(1) Financial Statements:

The financial statements required by Item 15(a) are filed as part of this Annual Report on Form 10-K under Item 8 “Financial Statements and Supplementary Data.”

(2) Financial Statement Schedules

The financial statement schedules required by Item 15(a) are omitted because they are not applicable, not required or the required information is included in the financial statements or notes thereto as filed in Item 8 of this Annual Report on Form 10-K.

(3) Exhibits.

| Exhibit 
 Number  |     | Description                                                                                                                                                             |     | Form  |     | File No.   |     | Exhibit           
 Filing            
 Date              |     | Filed/ Furnished 
 Herewith         |
| 3.1     |     | Restated Certificate of Incorporation, dated June 1, 2021, as amended June 22, 2023.                                                                                    |     | 10-Q  |     | 001-40431  |     | August 7, 2023    |     |                  |
| 3.2     |     | Amended and Restated Bylaws, dated February 17, 2023.                                                                                                                   |     | 8-K   |     | 001-40431  |     | February 23, 2023 |     |                  |
| 3.3     |     | Certificate of Ownership and Merger, dated December 23,