13D/13G Filings - Atara Biotherapeutics Inc. (ATRA)

Real time Form 13D and 13G transaction reports:

  • Schedule 13D must be filed within ten days after a person or an organization acquires beneficial ownership of more than 5% of a voting class of a company's equity securities.
  • Due to inconsistent filing format, it is highly recommended that you read the orignal filing form.
  • Shares have beem adjusted for stock split.
"Insiders might sell their shares for any number of reasons, but they buy them for only one: they think the price will rise"
- Peter Lynch
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Time period
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Reported
DateTime
Transaction
Date
TypeCompany
Symbol
Filed By
Symbol
Shares Owned
% Owned
Shares Vs. Prev ReportView
2025-05-23
4:05 pm
Purchase
2025-05-1613DAtara Biotherapeutics, Inc.
ATRA
Redmile Group LLC705,207
9.900%
103,964increase
(+17.29%)
Filing
History
2025-05-21
6:00 pm
Purchase
2025-05-1613DAtara Biotherapeutics, Inc.
ATRA
Panacea Innovation Limited1,638,565
19.990%
1,638,565increase
(New Position)
Filing
History
2025-05-16
6:28 pm
Purchase
2025-05-1413DAtara Biotherapeutics, Inc.
ATRA
Adiumentum Capital Fund I LP1,370,081
19.990%
235,759increase
(+20.78%)
Filing
History
2025-05-15
9:00 pm
Purchase
2025-03-3113GAtara Biotherapeutics, Inc.
ATRA
Redmile Group LLC601,243
9.900%
601,243increase
(New Position)
Filing
History
2025-02-06
6:34 pm
Purchase
2025-01-3013GAtara Biotherapeutics, Inc.
ATRA
Panacea Innovation Limited550,000
9.500%
550,000increase
(New Position)
Filing
History
2024-11-14
6:10 pm
Purchase
2024-09-3013GAtara Biotherapeutics, Inc.
ATRA
EcoR1 Capital, LLC493,463
9.990%
493,463increase
(New Position)
Filing
History
2024-11-14
4:17 pm
Purchase
2024-09-3013GAtara Biotherapeutics, Inc.
ATRA
Citadel Advisors LLC260,480
4.600%
260,480increase
(New Position)
Filing
History
2024-11-12
1:29 pm
Unchanged
2024-09-3013GAtara Biotherapeutics, Inc.
ATRA
The Vanguard Group180,715
3.180%
0
(Unchanged)
Filing
History
2024-11-04
11:24 am
Purchase
2024-09-3013GAtara Biotherapeutics, Inc.
ATRA
The Vanguard Group180,715
3.180%
180,715increase
(New Position)
Filing
History
2024-09-13
4:01 pm
Purchase
2024-09-0313GAtara Biotherapeutics, Inc.
ATRA
Redmile Group LLC579,541
9.900%
167,485increase
(+40.65%)
Filing
History
2024-09-05
4:07 pm
Purchase
2024-09-0313DAtara Biotherapeutics, Inc.
ATRA
Adiumentum Capital Fund I LP1,134,322
19.990%
811,685increase
(+251.58%)
Filing
History
2024-07-08
4:32 pm
Sale
2024-06-3013GAtara Biotherapeutics, Inc.
ATRA
BlackRock Inc.
BLK
0
0.000%
-283,489decrease
(Position Closed)
Filing
History
2024-05-22
6:18 pm
Purchase
2024-05-1513DAtara Biotherapeutics, Inc.
ATRA
Adiumentum Capital Fund I LP322,637
6.700%
322,637increase
(New Position)
Filing
History
2024-03-18
4:13 pm
Purchase
2024-03-0813GAtara Biotherapeutics, Inc.
ATRA
Citadel Advisors LLC261,325
6.400%
261,325increase
(New Position)
Filing
History
2024-02-14
5:03 pm
Sale
2023-12-3113GAtara Biotherapeutics, Inc.
ATRA
MAVERICK CAPITAL LTD0
0.000%
-251,641decrease
(Position Closed)
Filing
History
2024-02-14
4:26 pm
Purchase
2023-12-3113GAtara Biotherapeutics, Inc.
ATRA
Redmile Group LLC412,056
9.900%
18,557increase
(+4.72%)
Filing
History
2024-02-13
4:58 pm
Sale
2023-12-2913GAtara Biotherapeutics, Inc.
ATRA
The Vanguard Group267,442
6.560%
-21,000decrease
(-7.28%)
Filing
History
2024-02-09
4:22 pm
Sale
2024-02-0913GAtara Biotherapeutics, Inc.
ATRA
WASATCH ADVISORS LP0
0.000%
-335,641decrease
(Position Closed)
Filing
History
2024-02-06
4:45 pm
Sale
2023-12-2913GAtara Biotherapeutics, Inc.
ATRA
GOLDMAN SACHS GROUP INC
GS
23,225
0.600%
-221,105decrease
(-90.49%)
Filing
History
2024-01-26
5:25 pm
Sale
2023-12-3113GAtara Biotherapeutics, Inc.
ATRA
BlackRock Inc.
BLK
283,489
7.000%
-82,597decrease
(-22.56%)
Filing
History
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