Ticker · CUSIP 046513206

ATRA

ATARA BIOTHERAPEUTICS INC
···Share
Holders (tracked)
3
Combined shares
63,913
Combined value
$1.16M
Last close
—
Quarter
2025Q4
Tracked holders · last 8 quarters
+2 vs previous quarter over the last 7.
372024Q22025Q4

SEC event timeline

4 events
  1. Ken Griffin (Citadel Advisors) opened position2026-02-17
    +15,577 shares · 2025Q4
    13F
  2. Steve Cohen (Point72) opened position2026-02-17
    +18,296 shares · 2025Q4
    13F
  3. Renaissance Technologies added2026-02-12
    +11,104 shares · 2025Q4
    13F
  4. Renaissance Technologies added2025-11-13
    +2,000 shares · 2025Q3
    13F

Insider activity

No insider transactions in the last 30 days.
View full insider history for ATRA →

Who moved on this name in 2025Q4

13F transactions reported for the latest quarter, grouped by direction.
New positions2
Added to1
Trimmed0
—
Exited0
—

Institutional ownership over time

Distinct super-investors holding this ticker · combined dollar value, by quarter.
QuarterHoldersCombined value
2024Q2
7
$4.3M
2024Q3
3
$4.1M
2024Q4
3
$4.6M
2025Q1
1
$104K
2025Q2
2
$308K
2025Q3
1
$271K
2025Q4
3
$1.2M

Who owns ATRA

3 super-investors · 2025Q4
Tracked stake
63.9K
shares
Combined value
$1M
% of shares outstanding
—
shares-out unknown
Quarter action mix
New2Added1
#ManagerSharesValue
1Renaissance Technologies30.0K$543K
2Steve Cohen
Point72
18.3K$331K
3Ken Griffin
Citadel Advisors
15.6K$282K

Recent moves

16 transactions
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