ATARA BIOTHERAPEUTICS INC (ATRA): Ownership & Insider Activity
Hedge funds and institutional managers reporting a position in ATRA · Health Care. Based on the most recent 13F filing from each holder, sourced from SEC EDGAR.
Reported Holders
5
13F filers
Aggregate Value
$17.9M
Across holders
Last Price
$9.46
2026-08-24
Sector
Health Care
GICS
Quarterly fund activity3 increased1 reduced0 exited
| Manager⇅ | Type⇅ | Shares⇅ | Market Value▼ | % of Total⇅ | % of Portfolio⇅ | Action⇅ | QoQ Change⇅ | Quarter⇅ |
|---|---|---|---|---|---|---|---|---|
| ADAGE CAPITAL PARTNERS GP, L.L.C. CIK 0001165408 | Hedge Fund | 850K | $9.8M | 54.5% | 0.0% | Added | +$1.7M | Q2 2026 |
| Point72 Asset Management, L.P. CIK 0001603466 | Hedge Fund | 688K | $7.9M | 44.1% | 0.0% | Added | +$5.7M | Q2 2026 |
| MILLENNIUM MANAGEMENT LLC CIK 0001273087 | Hedge Fund | 13K | $146K | 0.8% | 0.0% | Reduced | $-402K | Q2 2026 |
| CITADEL ADVISORS LLC CIK 0001423053 | Hedge Fund | 10K | $117K | 0.7% | 0.0% | Added | — | Q2 2026 |
| Rockefeller Capital Management L.P. CIK 0001739439 | Hedge Fund | 8 | $92 | 0.0% | 0.0% | Unchanged | +$0 | Q2 2026 |
Added
Hedge Fund
$9.8M· 54.5% of total· 0.0% port· 850K sh· +$1.7M QoQ· Q2 2026
Added
Hedge Fund
$7.9M· 44.1% of total· 0.0% port· 688K sh· +$5.7M QoQ· Q2 2026
Reduced
Hedge Fund
$146K· 0.8% of total· 0.0% port· 13K sh· $-402K QoQ· Q2 2026
Added
Hedge Fund
$117K· 0.7% of total· 0.0% port· 10K sh· — QoQ· Q2 2026
Unchanged
Hedge Fund
$92· 0.0% of total· 0.0% port· 8 sh· +$0 QoQ· Q2 2026
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