ARCELLX INC

Ticker: ACLX CUSIP: 03940C100 Class: Common Stock

RA CAPITAL MANAGEMENT, L.P.'s Holding History (CIK: 0001346824)

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

Q4 2025

Shares 1,267,156 Value ($000) $82,619 Avg Close $79.78 Range $63.03 - $94.07

Q3 2025

Shares 3,036,527 Value ($000) $249,299 Avg Close $71.99 Range $63.13 - $83.08

Q2 2025

Shares 3,036,527 Value ($000) $199,955 Avg Close $62.26 Range $47.86 - $69.84

Q1 2025

Shares 3,036,527 Value ($000) $199,196 Avg Close $67.74 Range $57.17 - $81.00

Q4 2024

Shares 2,787,327 Value ($000) $213,760 Avg Close $86.39 Range $73.33 - $107.37

Q3 2024

Shares 1,851,479 Value ($000) $154,617 Avg Close $66.59 Range $49.00 - $88.66

Q2 2024

Shares 1,604,014 Value ($000) $88,526 Avg Close $54.36 Range $47.88 - $69.19

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	1,267,156	$82,619	$79.78	$63.03 - $94.07
Q3 2025	3,036,527	$249,299	$71.99	$63.13 - $83.08
Q2 2025	3,036,527	$199,955	$62.26	$47.86 - $69.84
Q1 2025	3,036,527	$199,196	$67.74	$57.17 - $81.00
Q4 2024	2,787,327	$213,760	$86.39	$73.33 - $107.37
Q3 2024	1,851,479	$154,617	$66.59	$49.00 - $88.66
Q2 2024	1,604,014	$88,526	$54.36	$47.88 - $69.19