DAY ONE BIOPHARMACEUTICALS I

Ticker: DAWN CUSIP: 23954D109 Class: Common Stock

ARROWSTREET CAPITAL, LIMITED PARTNERSHIP's Holding History (CIK: 0001164508)

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

Q4 2025

Shares 255,022 Value ($000) $2,377 Avg Close $8.35 Range $6.70 - $10.90

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	255,022	$2,377	$8.35	$6.70 - $10.90