ATRA
ATARA BIOTHER (ATRA)
NASDAQ
$9.35+$0.004 (+0.04%)
Price as of Oct 22, 2026 7:30 PM EDT
  • $93.9M
    Market Cap
  • -36.09%
    1-Year Change
  • Biotechnology
    Industry

Top Holders

Institutional
Mutual Funds
Holder
Ownership %
Shares Held
Change (Shares, %)
Report Date
WASATCH ADVISORS INC
83.59%
8.4M
+254,651 (+3.03%)
Dec 31, 2022
KPCB XV ASSOCIATES, LLC
18.70%
1.9M
0 (0.00%)
Sep 30, 2022
ECOR1 CAPITAL, LLC
15.46%
1.6M
+1.5M (+93.58%)
Jun 30, 2026
EMINENCE CAPITAL LLC
11.37%
1.1M
+1.1M (+100.00%)
Dec 31, 2021
BLACKROCK FUND ADVISORS
11.07%
1.1M
+135,420 (+12.18%)
Dec 31, 2016
ANTIPODEAN ADVISORS LLC
9.96%
1.0M
0 (0.00%)
Sep 30, 2023
NORGES BANK
8.65%
868,658
+68,900 (+7.93%)
Dec 31, 2022

Current Ownership Distribution

  • Institutions969.5M (65.87%)
  • Mutual Funds491.2M (33.38%)
  • Insiders11.1M (0.75%)
  • Other0 (0.00%)

Insider Transactions

  • 0.75% (11.1M)
    Current InsiderOwnership (%, shares)
  • 1
    Number of InsiderBuying (last 12 months)
  • $598,272.00
    Amount of InsiderBuying (last 12 months)
  • 3
    Number of InsiderSelling (last 12 months)
  • $12.2M
    Amount of InsiderSelling (last 12 months)
Insider Name & Title
Type
Date
Transaction Value
Shares
Share Price
Shares After Transactions
Cherry Brian N
Buy
Sep 04, 2026
$999,993.60
104,166
$9.60
166,486
Nguyen AnhCo
President and CEO
Sell
Aug 17, 2026
$40,882.74
5,062
$8.08
132,775
Cherry Brian N
Award
Jun 11, 2026
$0.00
24,000
$0.00
62,320
Fust Matthew K
Award
Jun 09, 2026
$0.00
12,000
$0.00
30,188
HEIDEN WILLIAM K
Award
Jun 09, 2026
$0.00
12,000
$0.00
34,188
Panacea Innovation Ltd
Exempt
Mar 17, 2026
$1.7M
259,163
$6.61
0
Panacea Innovation Ltd
Exempt
Mar 17, 2026
$25.92
259,163
$0.00
307,899
Panacea Innovation Ltd
In Kind
Mar 17, 2026
$26.15
5
$5.23
307,894
Grant-Huerta Yanina
Chief Accounting Officer
Award
Mar 09, 2026
$0.00
20,300
$0.00
52,050
Nguyen AnhCo
President and CEO
Award
Mar 09, 2026
$0.00
81,100
$0.00
143,078
Grant-Huerta Yanina
Chief Accounting Officer
Sell
Mar 02, 2026
$121.85
24
$5.08
33,830
Nguyen AnhCo
President and CEO
Sell
Mar 02, 2026
$1,005.64
198
$5.08
64,776
Grant-Huerta Yanina
Chief Accounting Officer
Sell
Mar 02, 2026
$8,144.84
1,603
$5.08
32,227
Nguyen AnhCo
President and CEO
Sell
Mar 02, 2026
$294.64
58
$5.08
64,718
Grant-Huerta Yanina
Chief Accounting Officer
Sell
Mar 02, 2026
$1,915.91
377
$5.08
31,850
Nguyen AnhCo
President and CEO
Sell
Mar 02, 2026
$6,601.63
1,298
$5.09
63,420
Grant-Huerta Yanina
Chief Accounting Officer
Sell
Mar 02, 2026
$508.30
100
$5.08
31,750
Nguyen AnhCo
President and CEO
Sell
Mar 02, 2026
$7,335.45
1,442
$5.09
61,978
Panacea Innovation Ltd
Sell
Jan 12, 2026
$489,019.17
80,554
$6.07
1.3M
Nguyen AnhCo
President and CEO
Sell
Nov 17, 2025
$37,698.77
2,859
$13.19
65,030
Nguyen AnhCo
President and CEO
Sell
Nov 17, 2025
$738.53
56
$13.19
64,974
Grant-Huerta Yanina
Chief Accounting Officer
Sell
Aug 18, 2025
$638.50
55
$11.61
37,012
Nguyen AnhCo
President and CEO
Sell
Aug 18, 2025
$661.94
57
$11.61
70,790
Grant-Huerta Yanina
Chief Accounting Officer
Sell
Aug 18, 2025
$998.72
86
$11.61
36,926
Nguyen AnhCo
President and CEO
Sell
Aug 18, 2025
$14,878.82
1,281
$11.62
69,509
Grant-Huerta Yanina
Chief Accounting Officer
Sell
Aug 18, 2025
$19,372.15
1,668
$11.61
35,258
Nguyen AnhCo
President and CEO
Sell
Aug 18, 2025
$18,819.54
1,620
$11.62
67,889
Panacea Innovation Ltd
Buy
Jul 17, 2025
$186,372.00
19,335
$9.64
1.4M
Fust Matthew K
Award
Jun 10, 2025
$0.00
7,828
$0.00
18,188
Roncarolo Maria Grazia
Award
Jun 10, 2025
$0.00
7,828
$0.00
17,368