Company: DAWN
Filing Date: 2025-03-06
Form Type: 10-K/A
Source: 0000950170-25-034878
Chunk: 48

Company: Day One Biopharmaceuticals, Inc.
Filing Date: 2025-03-06
Form: 10-K/A
Chunk 48
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 for stock options as of December 31, 2024 was$45.9million, which is expected to be recognized over a weighted-average period of2.1years.

The Company used the Black-Scholes option pricing model to estimate the fair value of stock option awards granted with the following assumptions:

|                          |     | Year Ended      
 December 31,    
 2024            |   |     | 2023            |     | 2022            |
|:-------------------------|:----|:----------------|:--|:----|:----------------|:----|:----------------|
| Expected term (in years) |     | 5.27 - 6.74     |   |     | 5.27 - 6.25     |     | 2.92 - 6.33     |
| Expected volatility      |     | 68.27% - 70.57% |   |     | 68.74% - 81.98% |     | 65.20% - 81.68% |
| Risk-free interest rate  |     | 3.43% - 4.47%   |   |     | 3.47% - 4.67%   |     | 1.47% - 4.37%   |
| Expected dividend yield  |     |                 | — |     | —               |     | —               |

Restricted Stock Units

The following table provides a summary of restricted stock units activity under the 2021 Plan during the year endedDecember 31, 2024:

|                                                      |     | Number of 
 Shares    |           |   |     | Weighted Average      
 Grant Date Fair Value 
 Per Share             |       |
|:-----------------------------------------------------|:----|:----------|----------:|:--|:----|:----------------------|------:|
| Unvested restricted stock units at December 31, 2023 |     |           | 1,031,545 |   |     | $                     | 18.27 |
| Granted                                              |     |           | 1,640,180 |   |     | $                     | 14.35 |
| Vested                                               |     |           |  (680,963 | ) |     | $                     | 16.48 |
| Forfeiture                                           |     |           |  (216,475 | ) |     | $                     | 16.22 |
| Unvest