InvestorLens

ATRA — ATARA BIOTHERAPEUTICS INC

Public company

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For educational research only.InvestorLens analyzes public regulatory filings (SEC EDGAR, STOCK Act PTRs) that may be delayed by 45 days or more. Information shown is historical and is not financial, legal, or tax advice, nor a recommendation or solicitation to buy or sell any security. Always do your own research.

InvestorLens aggregates public filing data to show which tracked investors reported holdings in this stock. Dollar values represent reported position values, not market capitalization, and may be delayed up to 45 days. Not a recommendation.

Sourced from SEC EDGAR public filings

About ATARA BIOTHERAPEUTICS INC (ATRA)

ATARA BIOTHERAPEUTICS INC (ATRA) appears in the most recent 13F filings of 3 tracked institutional investors. The largest disclosed position is held by Steve Cohen (Point72 Asset Management), valued at $918,869. Across recent filings, tracked investors recorded 3 new positions, 0 increased, 0 reduced, and 0 exited. All data sourced from SEC 13F filings.

Smart Money Consensus™

Based on recent institutional activity in ATRA

100
/100
Strong Institutional Accumulation
Added / Increased3
Reduced0
Exited0
BearishBullish
Crowded Trade Score™

How many top investors track ATRA

20
/100
Emerging Interest
3investors

A small number of top investors own this.

UndiscoveredCrowded
151015+

ATRA Ownership Composition

How ATARA BIOTHERAPEUTICS INC is held across tracked investor types, based on reported 13F positions.

Dominant Type
Hedge Funds
64% of tracked value
Institutions
3
tracked investors
Total Reported
$1.4M
combined 13F value
Sectors2
  • Hedge Funds64.4%
  • Other35.6%
Hedge Funds(1)
64.4%
Other(2)
35.6%

Tracked investors reporting ATRA

  • Steve CohenMar 31, 2026
    Point72 Asset Management
    Shares
    194.3K
    Value
    $918.9K
    % Portfolio
    0.00%
  • Ken GriffinDec 31, 2025
    Citadel Advisors
    Shares
    15.6K
    Value
    $281.8K
    % Portfolio
    0.00%
  • Izzy EnglanderMar 31, 2026
    Millennium Management
    Shares
    47.7K
    Value
    $225.6K
    % Portfolio
    0.00%

Recent activity

Frequently asked questions

How many institutional investors hold ATRA?
3 tracked institutional investors disclosed a position in ATRA (ATARA BIOTHERAPEUTICS INC) in their most recent 13F filing.
Who is the largest institutional holder of ATRA?
Steve Cohen, Point72 Asset Management, holds the largest disclosed position in ATRA, valued at $918,869.
Did institutional ownership of ATRA increase or decrease?
Across recent 13F filings, tracked investors recorded 3 new positions, 0 increased, 0 reduced, and 0 fully exited ATRA.
Where does this ATRA ownership data come from?
SEC Form 13F-HR filings, accessed via EDGAR. 13F filings are disclosed quarterly with a 45-day reporting delay and cover U.S.-listed long equity positions only. This is not investment advice.
ATRA (ATARA BIOTHERAPEUTICS INC) — Institutional Holders & — InvestorLens