ATARA BIOTHERAPEUTICS INC

Ticker: ATRA CUSIP: 046513206 Class: Common Stock

Holders for Q4 2025 Position Changes for Q4 2025

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

New Positions (7)

Point72 Asset Management, L.P.

Value ($000) $331 Shares 18,296

Walleye Capital LLC

Value ($000) $220 Shares 12,169

CITADEL ADVISORS LLC

Value ($000) $282 Shares 15,577

Connor, Clark & Lunn Investment Management Ltd.

Value ($000) $189 Shares 10,446

SUSQUEHANNA INTERNATIONAL GROUP, LLP

Value ($000) $254 Shares 14,018

DIMENSIONAL FUND ADVISORS LP

Value ($000) $181 Shares 10,028

FEDERATED HERMES, INC.

Value ($000) $2 Shares 130

Institution	Shares	Value ($000)
Point72 Asset Management, L.P.	18,296	$331
Walleye Capital LLC	12,169	$220
CITADEL ADVISORS LLC	15,577	$282
Connor, Clark & Lunn Investment Management Ltd.	10,446	$189
SUSQUEHANNA INTERNATIONAL GROUP, LLP	14,018	$254
DIMENSIONAL FUND ADVISORS LP	10,028	$181
FEDERATED HERMES, INC.	130	$2

Increased Positions (12)

GLOBEFLEX CAPITAL L P

Value ($000) $1,397 (+530.7%) Shares 77,224 (+399.6%)

BRIDGEWAY CAPITAL MANAGEMENT, LLC

Value ($000) $591 (+194.8%) Shares 32,691 (+133.5%)

MARSHALL WACE, LLP

Value ($000) $2,689 (+62.0%) Shares 148,632 (+28.4%)

VANGUARD GROUP INC

Value ($000) $4,087 (+40.2%) Shares 225,940 (+11.1%)

RENAISSANCE TECHNOLOGIES LLC

Value ($000) $543 (+100.3%) Shares 30,040 (+58.6%)

Quadrature Capital Ltd

Value ($000) $368 (+55.2%) Shares 20,321 (+22.8%)

BANK OF AMERICA CORP /DE/

Value ($000) $188 (+124.3%) Shares 10,387 (+77.7%)

Tower Research Capital LLC (TRC)

Value ($000) $31 (+541.1%) Shares 1,737 (+407.9%)

GEODE CAPITAL MANAGEMENT, LLC

Value ($000) $1,129 (+30.2%) Shares 62,381 (+3.1%)

NORTHERN TRUST CORP

Value ($000) $223 (+41.2%) Shares 12,340 (+11.8%)

STATE STREET CORP

Value ($000) $479 (+32.2%) Shares 26,453 (+4.8%)

Cambridge Investment Research Advisors, Inc.

Value ($000) $0 (+69.0%) Shares 22,864 (+33.6%)

Institution	Prev Shares	Curr Shares	Change
GLOBEFLEX CAPITAL L P	15,458	77,224	+61,766 (+399.6%)
BRIDGEWAY CAPITAL MANAGEMENT, LLC	14,000	32,691	+18,691 (+133.5%)
MARSHALL WACE, LLP	115,796	148,632	+32,836 (+28.4%)
VANGUARD GROUP INC	203,438	225,940	+22,502 (+11.1%)
RENAISSANCE TECHNOLOGIES LLC	18,936	30,040	+11,104 (+58.6%)
Quadrature Capital Ltd	16,542	20,321	+3,779 (+22.8%)
BANK OF AMERICA CORP /DE/	5,845	10,387	+4,542 (+77.7%)
Tower Research Capital LLC (TRC)	342	1,737	+1,395 (+407.9%)
GEODE CAPITAL MANAGEMENT, LLC	60,526	62,381	+1,855 (+3.1%)
NORTHERN TRUST CORP	11,033	12,340	+1,307 (+11.8%)
STATE STREET CORP	25,253	26,453	+1,200 (+4.8%)
Cambridge Investment Research Advisors, Inc.	17,109	22,864	+5,755 (+33.6%)

Decreased Positions (8)

MORGAN STANLEY

Value ($000) $289 (-43.8%) Shares 15,991 (-55.5%)

UBS Group AG

Value ($000) $25 (-89.8%) Shares 1,397 (-91.9%)

JANE STREET GROUP, LLC

Value ($000) $253 (-19.9%) Shares 13,990 (-36.6%)

MACKENZIE FINANCIAL CORP

Value ($000) $1,047 (+14.5%) Shares 58,668 (-8.1%)

BlackRock, Inc.

Value ($000) $1,214 (+21.3%) Shares 67,108 (-3.9%)

ROYAL BANK OF CANADA

Value ($000) $15 (-11.8%) Shares 850 (-29.7%)

BNP PARIBAS ARBITRAGE, SA

Value ($000) $1 (+16.2%) Shares 46 (-8.0%)

ACADIAN ASSET MANAGEMENT LLC

Value ($000) $1 (+20.9%) Shares 54,048 (-4.2%)

Institution	Prev Shares	Curr Shares	Change
MORGAN STANLEY	35,938	15,991	-19,947 (-55.5%)
UBS Group AG	17,268	1,397	-15,871 (-91.9%)
JANE STREET GROUP, LLC	22,060	13,990	-8,070 (-36.6%)
MACKENZIE FINANCIAL CORP	63,816	58,668	-5,148 (-8.1%)
BlackRock, Inc.	69,833	67,108	-2,725 (-3.9%)
ROYAL BANK OF CANADA	1,209	850	-359 (-29.7%)
BNP PARIBAS ARBITRAGE, SA	50	46	-4 (-8.0%)
ACADIAN ASSET MANAGEMENT LLC	56,416	54,048	-2,368 (-4.2%)

Exited Positions (2)

GSA CAPITAL PARTNERS LLP

Value ($000) $0 Shares 26,213

GROUP ONE TRADING, L.P.

Value ($000) $2 Shares 148

Institution	Prev Shares	Prev Value ($000)
GSA CAPITAL PARTNERS LLP	26,213	$0
GROUP ONE TRADING, L.P.	148	$2