Atara Biotherapeutics, Inc. (ATRA) Institutional Ownership

Institutions by Trading Activity

Ownership Statistics

0Shares Outstanding

1,353,122Shares held by institutions

$5,886,081Value of institutional holdings

14.36%Institutional ownership %

-8.73%Shares Changed QoQ

31No. of institutional investors

Shares Owned by Institutions

Shares Purchased/Sold by Institutions

Ownership Summary

Atara Biotherapeutics, Inc. (NASDAQ:ATRA) has 41 institutional investors with active 13F positions as of December 2025.

Their combined ownership stood at 15.1% of outstanding shares in December 2025, up from 13.9% in September 2025.
They increased total shares held in Atara Biotherapeutics by 10.04% from last quarter, and the number of investors in ATRA decreased 2.38% annually.
Of these 41 holders, 19 added to their stakes in Atara Biotherapeutics, 10 trimmed positions, and 12 made no changes.
Institutional investors collectively held 2.05Mn shares in Atara Biotherapeutics as of December 2025, up by 187.02K shares quarter on quarter, and down 369.95K shares year over year.
EcoR1 Capital, LLC leads ownership in ATRA with 573.18K shares as of December 31, 2025, equal to 4.23% of outstanding shares.
Top purchasers of ATRA stock for the quarter ending December 2025 included GLOBEFLEX CAPITAL L P (61.77K), MARSHALL WACE, LLP (32.84K), VANGUARD GROUP INC (22.5K), BRIDGEWAY CAPITAL MANAGEMENT, LLC (18.69K), Point72 Asset Management, L.P. (18.3K).
Top sellers of ATRA stock for the quarter ending December 2025 included Morgan Stanley (19.95K), UBS Group AG (15.87K), JANE STREET GROUP, LLC (8.07K), MACKENZIE FINANCIAL CORP (5.15K), BlackRock, Inc. (2.72K).
Per Business Quant, the top 10 investors in ATRA for the quarter ending December 2025 include EcoR1 Capital, LLC (573.18K), Redmile Group, LLC (441.7K), VANGUARD GROUP INC (225.94K), MARSHALL WACE, LLP (148.63K), GLOBEFLEX CAPITAL L P (77.22K), BlackRock, Inc. (67.11K), GEODE CAPITAL MANAGEMENT, LLC (62.38K), MACKENZIE FINANCIAL CORP (58.67K), ACADIAN ASSET MANAGEMENT LLC (54.05K), STALEY CAPITAL ADVISERS INC (50.0K).

41 Institutional Holders

1,353,122 Total Shares Held

Rows:

Download Data

Owner Name	Date	Change (QoQ)	Change (%)	Value (USD)
BlackRock, Inc.	31 Dec, 2025	-2,725	-3.90%	$0.00
EcoR1 Capital, LLC	31 Dec, 2025	0	0.00%	$0.00
Quadrature Capital Ltd	31 Dec, 2025	3,779	22.84%	$0.00
Rockefeller Capital Management L.P.	31 Dec, 2025	8	100.00%	$0.00
Redmile Group, LLC	31 Dec, 2025	0	0.00%	$0.00
Point72 Asset Management, L.P.	31 Dec, 2025	18,296	0.00%	$0.00
VANGUARD GROUP INC	31 Dec, 2025	22,502	11.06%	$0.00
Walleye Capital LLC	31 Dec, 2025	12,169	0.00%	$0.00
MARSHALL WACE, LLP	31 Dec, 2025	32,836	28.36%	$0.00
SBI Securities Co., Ltd.	31 Dec, 2025	0	0.00%	$0.00
GLOBEFLEX CAPITAL L P	31 Dec, 2025	61,766	399.57%	$0.00
UBS Group AG	31 Dec, 2025	-15,871	-91.91%	$0.00
GEODE CAPITAL MANAGEMENT, LLC	31 Dec, 2025	1,855	3.06%	$0.00
Private Wealth Asset Management, LLC	31 Dec, 2025	0	0.00%	$0.00
MACKENZIE FINANCIAL CORP	31 Dec, 2025	-5,148	-8.07%	$0.00
Banque Transatlantique SA	31 Dec, 2025	176	100.00%	$0.00
ACADIAN ASSET MANAGEMENT LLC	31 Dec, 2025	-2,368	-4.20%	$0.00
KERR FINANCIAL PLANNING Corp	31 Dec, 2025	0	0.00%	$0.00
STALEY CAPITAL ADVISERS INC	31 Dec, 2025	0	0.00%	$0.00
OSAIC HOLDINGS, INC.	31 Dec, 2025	0	0.00%	$0.00

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