ATRA: Atara Biotherapeutics, Inc. insider trading, 5% holders and institutional ownership
From public SEC filings: open-market insider purchases and sales (Form 4, last 180 days), holders of 5% or more (Schedules 13D and 13G) and institutional ownership (Form 13F). Insider and 5% data delayed 48 hours.
Insider trading
0 open-market buys totaling - and 0 sales totaling - in the last 180 days.
Activist and 5% holders
| Filed | What | Holder | Stake | Change | Filing |
|---|---|---|---|---|---|
| 2026-08-14 | 13G amendment | Point72 Asset Management, L.P. | 7.60% | SEC |
Institutional ownership (Q2 2026)
35 institutions reported holding $50.85M of Atara Biotherapeutics, Inc. on Form 13F (32 the quarter before). 4 opened a new position and 1 sold out. Shares held by institutions: +74%.
| Largest holders | Shares | Value |
|---|---|---|
| EcoR1 Capital, LLC | 1,552,000 | $17.82M |
| ADAGE CAPITAL PARTNERS GP, L.L.C. | 850,000 | $9.76M |
| Point72 Asset Management, L.P. | 687,718 | $7.90M |
| Redmile Group, LLC | 441,701 | $5.07M |
| VANGUARD CAPITAL MANAGEMENT LLC | 247,047 | $2.84M |
| MACKENZIE FINANCIAL CORP | 233,249 | $2.68M |
| BlackRock, Inc. | 84,455 | $970K |
| GEODE CAPITAL MANAGEMENT, LLC | 75,128 | $863K |
| STALEY CAPITAL ADVISERS INC | 50,000 | $574K |
| VANGUARD FIDUCIARY TRUST CO | 43,036 | $494K |
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