DAY ONE BIOPHARMACEUTICALS I

Ticker: DAWN CUSIP: 23954D109 Class: Common Stock

EcoR1 Capital, LLC's Holding History (CIK: 0001587114)

Note: Option positions (PUT/CALL) are excluded.

Q2 2025

Shares 862,068 Value ($000) $5,603 Avg Close $6.88 Range $6.08 - $8.14

Q1 2025

Shares 862,068 Value ($000) $6,836 Avg Close $10.77 Range $7.54 - $13.53

Q4 2024

Shares 862,068 Value ($000) $10,922 Avg Close $13.91 Range $12.11 - $16.76

Q3 2024

Shares 862,068 Value ($000) $12,009 Avg Close $14.27 Range $12.53 - $16.75

Period	Shares	Value ($000)	Average Close	Price Range
Q2 2025	862,068	$5,603	$6.88	$6.08 - $8.14
Q1 2025	862,068	$6,836	$10.77	$7.54 - $13.53
Q4 2024	862,068	$10,922	$13.91	$12.11 - $16.76
Q3 2024	862,068	$12,009	$14.27	$12.53 - $16.75