ARCELLX INC

Ticker: ACLX CUSIP: 03940C100 Class: Common Stock

Rock Springs Capital Management LP's Holding History (CIK: 0001595725)

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

Q4 2025

Shares 169,859 Value ($000) $11,075 Avg Close $79.78 Range $63.03 - $94.07

Q3 2025

Shares 178,982 Value ($000) $14,694 Avg Close $71.99 Range $63.13 - $83.08

Q2 2025

Shares 186,314 Value ($000) $12,269 Avg Close $62.26 Range $47.86 - $69.84

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	169,859	$11,075	$79.78	$63.03 - $94.07
Q3 2025	178,982	$14,694	$71.99	$63.13 - $83.08
Q2 2025	186,314	$12,269	$62.26	$47.86 - $69.84