ARCELLX INC

Ticker: ACLX CUSIP: 03940C100 Class: Common Stock

GROUP ONE TRADING, L.P.'s Holding History (CIK: 0000932540)

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

Q4 2025

Shares 1,969 Value ($000) $128 Avg Close $79.78 Range $63.03 - $94.07

Q3 2025

Shares 581 Value ($000) $48 Avg Close $71.99 Range $63.13 - $83.08

Q3 2024

Shares 3,709 Value ($000) $310 Avg Close $66.59 Range $49.00 - $88.66

Q2 2023

Shares 263 Value ($000) $8 Avg Close $38.23 Range $27.28 - $48.91

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	1,969	$128	$79.78	$63.03 - $94.07
Q3 2025	581	$48	$71.99	$63.13 - $83.08
Q3 2024	3,709	$310	$66.59	$49.00 - $88.66
Q2 2023	263	$8	$38.23	$27.28 - $48.91