ATARA BIOTHERAPEUTICS INC

Ticker: ATRA CUSIP: 046513206 Class: Common Stock

CITADEL ADVISORS LLC's Holding History (CIK: 0001423053)

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

Q4 2025

Shares 15,577 Value ($000) $282 Avg Close $14.93 Range $10.50 - $18.95

Q2 2025

Shares 23,003 Value ($000) $178 Avg Close $7.30 Range $5.00 - $9.68

Q4 2024

Shares 267,353 Value ($000) $3,558 Avg Close $10.54 Range $7.20 - $14.93

Q3 2024

Shares 260,480 Value ($000) $2,118 Avg Close $8.56 Range $6.50 - $12.98

Q2 2024

Shares 260,480 Value ($000) $2,214 Avg Close $15.04 Range $7.07 - $20.82

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	15,577	$282	$14.93	$10.50 - $18.95
Q2 2025	23,003	$178	$7.30	$5.00 - $9.68
Q4 2024	267,353	$3,558	$10.54	$7.20 - $14.93
Q3 2024	260,480	$2,118	$8.56	$6.50 - $12.98
Q2 2024	260,480	$2,214	$15.04	$7.07 - $20.82