ATARA BIOTHERAPEUTICS INC

Ticker: ATRA CUSIP: 046513206 Class: Common Stock

Tower Research Capital LLC (TRC)'s Holding History (CIK: 0001533421)

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

Q4 2025

Shares 1,737 Value ($000) $31 Avg Close $14.93 Range $10.50 - $18.95

Q3 2025

Shares 342 Value ($000) $5 Avg Close $11.51 Range $7.54 - $14.90

Q1 2025

Shares 185 Value ($000) $1 Avg Close $8.73 Range $5.40 - $18.70

Q4 2024

Shares 70 Value ($000) $1 Avg Close $10.54 Range $7.20 - $14.93

Q3 2024

Shares 752 Value ($000) $6 Avg Close $8.56 Range $6.50 - $12.98

Q2 2024

Shares 4,467 Value ($000) $38 Avg Close $15.04 Range $7.07 - $20.82

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	1,737	$31	$14.93	$10.50 - $18.95
Q3 2025	342	$5	$11.51	$7.54 - $14.90
Q1 2025	185	$1	$8.73	$5.40 - $18.70
Q4 2024	70	$1	$10.54	$7.20 - $14.93
Q3 2024	752	$6	$8.56	$6.50 - $12.98
Q2 2024	4,467	$38	$15.04	$7.07 - $20.82