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Detailed Insider History for:
ATARA BIOTHERAPEUTICS INC: ATRA
Price: 10/24/25 52-Wk
High		 52-Wk
Low		 Mkt Cap (mm) Shrs Out (mm) 3-Mth Ave
Vol (m)		 Ind. Yield Short Int
% Float		 Inst. Owned Insider Owned
$14.49 $18.71 $5.01 $102 7 53 0.0% 2.2% 45.76% 21.19%
Exch Sector Industry Sub-Industry
NasdaqGS Manufacturing Chemicals And Allied Products Biological Products, (No Disgnostic Substances)
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Insider Statistics
T N H M S
Filer Name
Insider Title
Trans Type
Dollar Value
Shares Traded
Trans Date From
Trans Date To
Trans Price From
Trans Price To
Total Holdings
Delta % Owned
Owned
Other Info
Input Date
1
    
 
NGUYEN ANHCO
PR,CEO,DIR
S
$34,360
2,958
---
8/18/25
$11.61
$11.62
67,889
-4.2
D
R
8/20/25 - 4:11:40 pm
2
    
 
GRANT HUERTA YANINA
CAO
S
$21,009
1,809
---
8/18/25
---
$11.61
35,258
-4.9
D
R
8/20/25 - 4:08:26 pm
3
    
 
PANACEA INNOVATION LTD
BO
B
$670,423
55,000
---
8/15/25
---
$12.19
1,405,000
4.1
I
---
8/19/25 - 8:15:04 pm
4
    
 
PANACEA INNOVATION LTD
BO
B
$186,372
19,335
---
7/17/25
---
$9.64
1,350,000
1.5
I
---
7/21/25 - 9:00:05 am
5
    
 
GALLAGHER CAROL GILTNER
DIR
JB
---
7,828
---
6/10/25
---
---
33,012
31.1
D
R
6/12/25 - 8:39:40 pm
6
    
 
FUST MATTHEW K
DIR
JB
---
7,828
---
6/10/25
---
---
18,188
75.6
D
R
6/12/25 - 8:39:27 pm
7
    
 
TOUCHON PASCAL
DIR
JB
---
7,828
---
6/10/25
---
---
77,955
11.2
D
R
6/12/25 - 8:39:15 pm
8
    
 
RONCAROLO MARIA GRAZIA
DIR
JB
---
7,828
---
6/10/25
---
---
17,368
82.1
D
R
6/12/25 - 8:39:02 pm
9
    
 
MALLIK AMEET
DIR
JB
---
7,828
---
6/10/25
---
---
16,928
86.0
D
R
6/12/25 - 8:38:51 pm
10
    
 
HEIDEN WILLIAM K
DIR
JB
---
7,828
---
6/10/25
---
---
22,188
54.5
D
R
6/12/25 - 8:36:38 pm
11
    
 
SUBRAMANIAN NACHIAPPAN
DIR
3
---
---
---
5/16/25
---
---
---
---
---
---
5/23/25 - 4:01:41 pm
12
    
 
REDMILE GROUP LLC
DIR
3
---
---
---
5/16/25
---
---
441,701
---
I
---
5/23/25 - 4:01:24 pm
13
    
 
PANACEA INNOVATION LTD
BO
3
---
---
---
5/16/25
---
---
1,330,665
---
I
---
5/21/25 - 6:00:04 pm
14
    
 
GRANT HUERTA YANINA
CAO
S
$15,000
2,218
---
5/16/25
---
$6.76
37,067
-5.6
D
R
5/20/25 - 4:59:06 pm
15
    
 
NGUYEN ANHCO
PR,CEO,DIR
S
$22,156
3,276
---
5/16/25
---
$6.76
70,847
-4.4
D
R
5/20/25 - 4:58:33 pm
16
    
 
ADIUMENTUM CAPITAL FUND I LP
DIR,BO
JB
$499,531
75,572
---
5/16/25
---
$6.61
1,209,395
6.7
D
---
5/16/25 - 6:26:21 pm
17
    
 
GRANT HUERTA YANINA
CAO
3
---
---
---
3/31/25
---
---
39,285
---
D
R
4/10/25 - 7:14:26 pm
18
    
 
NGUYEN ANHCO
PR,CEO,DIR
S
$23,307
3,331
---
3/3/25
---
$7.00
74,123
-4.3
D
R
3/5/25 - 5:17:58 pm
19
    
 
HYLLENGREN ERIC J
VP,CFO,COO
S
$8,473
1,211
---
3/3/25
---
$7.00
56,231
-2.1
D
R
3/5/25 - 5:17:42 pm
20
    
 
HENRICH JILL
VP,LO
S
$7,410
1,059
---
3/3/25
---
$7.00
18,679
-5.4
D
R
3/5/25 - 5:16:33 pm
21
    
 
HYLLENGREN ERIC J
VP,CFO,COO
JB
---
34,050
---
1/27/25
---
---
57,442
145.6
D
R
1/29/25 - 4:52:53 pm
22
    
 
HENRICH JILL
VP,LO
S
$11,198
1,000
---
11/18/24
---
$11.20
19,378
-4.9
D
R
11/20/24 - 6:05:49 pm
23
    
 
HYLLENGREN ERIC J
VP,CFO,COO
S
$15,274
1,364
---
11/18/24
---
$11.20
23,392
-5.5
D
R
11/20/24 - 6:04:59 pm
24
    
 
NGUYEN ANHCO
PR,CEO,DIR
S
$18,633
1,664
---
11/18/24
---
$11.20
77,454
-2.1
D
R
11/20/24 - 6:04:00 pm
25
    
 
NGUYEN ANHCO
PR,CEO,DIR
JB
---
45,000
---
9/9/24
---
---
79,118
131.9
D
R
9/11/24 - 5:03:40 pm
26
    
 
ADIUMENTUM CAPITAL FUND I LP
DIR,BO
3
---
---
---
9/3/24
---
---
1,133,823
---
D
---
9/5/24 - 6:42:08 pm
27
    
 
TOUCHON PASCAL
PR,CEO,DIR
S
$20,139
3,038
---
8/16/24
---
$6.63
70,127
-4.2
D
R
8/20/24 - 6:27:58 pm
28
    
 
NGUYEN ANHCO
VP,CTO
S
$12,072
1,821
---
8/16/24
---
$6.63
34,118
-5.1
D
R
8/20/24 - 6:27:43 pm
29
    
 
MURUGAN AMAR
VP,LO
S
$7,677
1,158
---
8/16/24
---
$6.63
26,827
-4.1
D
R
8/20/24 - 6:27:26 pm
30
    
 
HYLLENGREN ERIC J
VP,CFO
S
$7,093
1,070
---
8/16/24
---
$6.63
24,756
-4.1
D
R
8/20/24 - 6:27:12 pm
31
    
 
HENRICH JILL
VP
S
$6,384
963
---
8/16/24
---
$6.63
20,378
-4.5
D
R
8/20/24 - 6:26:58 pm
32
    
 
TOUCHON PASCAL
PR,CEO,DIR
S
$50,289
81,506
---
5/16/24
---
$0.62
1,829,146
-4.3
D
R
5/20/24 - 8:34:45 pm
33
    
 
NGUYEN ANHCO
VP,CTO
S
$26,469
42,899
---
5/16/24
---
$0.62
898,498
-4.6
D
R
5/20/24 - 8:34:20 pm
34
    
 
MURUGAN AMAR
VP,LO
S
$19,991
32,401
---
5/16/24
---
$0.62
695,120
-4.5
D
R
5/20/24 - 8:33:56 pm
35
    
 
HYLLENGREN ERIC J
VP,CFO
S
$17,676
28,648
---
5/16/24
---
$0.62
645,671
-4.2
D
R
5/20/24 - 8:33:28 pm
36
    
 
HENRICH JILL
VP
S
$15,888
25,750
---
5/16/24
---
$0.62
529,251
-4.6
D
R
5/20/24 - 8:32:54 pm
37
    
 
FUST MATTHEW K
DIR
JB
---
150,000
---
3/31/24
---
---
259,000
137.6
D
R
4/2/24 - 6:13:10 pm
38
    
 
HEIDEN WILLIAM K
DIR
JB
---
150,000
---
3/31/24
---
---
359,000
71.8
D
R
4/2/24 - 6:12:47 pm
39
    
 
RONCAROLO MARIA GRAZIA
DIR
JB
---
150,000
---
3/31/24
---
---
238,500
169.5
D
R
4/2/24 - 6:12:27 pm
40
    
 
GALLAGHER CAROL GILTNER
DIR
JB
---
150,000
---
3/31/24
---
---
629,608
31.3
D
R
4/2/24 - 6:12:10 pm
41
    
 
MALLIK AMEET
DIR
JB
---
150,000
---
3/31/24
---
---
227,500
193.5
D
R
4/2/24 - 6:11:52 pm
42
    
 
TOUCHON PASCAL
PR,CEO,DIR
JS*
$17,888
24,844
---
3/4/24
---
$0.72
1,910,652
-1.3
D
R
3/6/24 - 6:19:43 pm
43
    
 
NGUYEN ANHCO
VP,CTO
JS*
$7,737
10,746
---
3/4/24
---
$0.72
941,397
-1.1
D
R
3/6/24 - 6:18:57 pm
44
    
 
MURUGAN AMAR
VP,LO
JS*
$7,232
10,044
---
3/4/24
---
$0.72
727,521
-1.4
D
R
3/6/24 - 6:18:12 pm
45
    
 
HYLLENGREN ERIC J
VP,CFO
JS*
$4,810
6,679
---
3/4/24
---
$0.72
674,319
-1.0
D
R
3/6/24 - 6:17:15 pm
46
    
 
HENRICH JILL
VP
JS*
$2,793
3,879
---
3/4/24
---
$0.72
555,001
-0.7
D
R
3/6/24 - 6:16:07 pm
47
    
 
TOUCHON PASCAL
PR,CEO,DIR
JB
---
1,280,000
---
1/8/24
---
---
1,935,496
195.3
D
R
1/9/24 - 4:41:09 pm
48
    
 
NGUYEN ANHCO
VP,CTO
JB
---
675,000
---
1/8/24
---
---
952,143
243.6
D
R
1/9/24 - 4:40:54 pm
49
    
 
MURUGAN AMAR
VP,LO
JB
---
475,000
---
1/8/24
---
---
737,565
180.9
D
R
1/9/24 - 4:40:34 pm
50
    
 
HYLLENGREN ERIC J
VP,CFO
JB
---
475,000
---
1/8/24
---
---
680,998
230.6
D
R
1/9/24 - 4:40:31 pm
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