# ATARA BIOTHERAPEUTICS INC (ATRA)

> Institutional ownership reported to the SEC as of Q2 2026, from Form 13F filings. Source: https://holderbook.com/stocks/ATRA/

- Reporting holders: 37
- Reported value: $51.7M
- Shares held by institutions: 4,504,594 of 10,037,710 outstanding
- Held through calls: 0.0%
- Held through puts: 0.0%

A 13F reports long US equity positions only. Shorts, bonds, foreign listings and cash are not visible here, and positions are disclosed up to 45 days after the quarter ends.

## Largest holders

| Manager | Value | Shares | Share of their book | Quarters held |
|---|---|---|---|---|
| [EcoR1 Capital, LLC](https://holderbook.com/funds/1587114-ecor1-capital-llc/) | $17.8M | 1,552,000 | 0.9% | 9 |
| [ADAGE CAPITAL PARTNERS GP, L.L.C.](https://holderbook.com/funds/1165408-adage-capital-partners-gp-l-l-c/) | $9.8M | 850,000 | 0.0% | 2 |
| [Point72 Asset Management, L.P.](https://holderbook.com/funds/1603466-point72-asset-management-l-p/) | $7.9M | 687,718 | 0.0% | 3 |
| [Redmile Group, LLC](https://holderbook.com/funds/1425738-redmile-group-llc/) | $5.1M | 441,701 | 0.3% | 9 |
| [VANGUARD CAPITAL MANAGEMENT LLC](https://holderbook.com/funds/2100119-vanguard-capital-management-llc/) | $2.8M | 247,047 | 0.0% | 2 |
| [MACKENZIE FINANCIAL CORP](https://holderbook.com/funds/919859-mackenzie-financial-corp/) | $2.7M | 233,249 | 0.0% | 5 |
| [BlackRock, Inc.](https://holderbook.com/funds/2012383-blackrock-inc/) | $969.5K | 84,455 | 0.0% | 8 |
| [GEODE CAPITAL MANAGEMENT, LLC](https://holderbook.com/funds/1214717-geode-capital-management-llc/) | $862.9K | 75,128 | 0.0% | 9 |
| [STATE STREET CORP](https://holderbook.com/funds/93751-state-street-corp/) | $607.4K | 52,906 | 0.0% | 9 |
| [STALEY CAPITAL ADVISERS INC](https://holderbook.com/funds/1106565-staley-capital-advisers-inc/) | $574.0K | 50,000 | 0.0% | 9 |
| [VANGUARD FIDUCIARY TRUST CO](https://holderbook.com/funds/933478-vanguard-fiduciary-trust-co/) | $494.1K | 43,036 | 0.0% | 2 |
| [ACADIAN ASSET MANAGEMENT LLC](https://holderbook.com/funds/916542-acadian-asset-management-llc/) | $444.0K | 38,845 | 0.0% | 9 |
| [JANE STREET GROUP, LLC](https://holderbook.com/funds/1595888-jane-street-group-llc/) | $348.4K | 30,345 | 0.0% | 4 |
| [CITADEL ADVISORS LLC](https://holderbook.com/funds/1423053-citadel-advisors-llc/) | $233.2K | 20,318 | 0.0% | 1 |
| [NORTHERN TRUST CORP](https://holderbook.com/funds/73124-northern-trust-corp/) | $190.5K | 16,591 | 0.0% | 7 |
| [FMR LLC](https://holderbook.com/funds/315066-fmr-llc/) | $186.4K | 16,238 | 0.0% | 9 |
| [XTX Topco Ltd](https://holderbook.com/funds/1828301-xtx-topco-ltd/) | $175.7K | 15,303 | 0.0% | 1 |
| [BRIDGEWAY CAPITAL MANAGEMENT, LLC](https://holderbook.com/funds/1107261-bridgeway-capital-management-llc/) | $160.7K | 14,000 | 0.0% | 9 |
| [MILLENNIUM MANAGEMENT LLC](https://holderbook.com/funds/1273087-millennium-management-llc/) | $145.6K | 12,680 | 0.0% | 2 |
| [MORGAN STANLEY](https://holderbook.com/funds/895421-morgan-stanley/) | $105.4K | 9,178 | 0.0% | 9 |
| [ROYAL BANK OF CANADA](https://holderbook.com/funds/1000275-royal-bank-of-canada/) | $55.0K | 4,743 | 0.0% | 7 |
| [UBS Group AG](https://holderbook.com/funds/1610520-ubs-group-ag/) | $45.7K | 3,979 | 0.0% | 9 |
| [Vanguard Global Advisers, LLC](https://holderbook.com/funds/1811242-vanguard-global-advisers-llc/) | $16.7K | 1,456 | 0.0% | 2 |
| [SBI Securities Co., Ltd.](https://holderbook.com/funds/1851815-sbi-securities-co-ltd/) | $16.1K | 1,404 | 0.0% | 7 |
| [JONES FINANCIAL COMPANIES LLLP](https://holderbook.com/funds/815917-jones-financial-companies-lllp/) | $8.4K | 803 | 0.0% | 7 |

## Quarter by quarter

| Quarter | Holders | Reported value |
|---|---|---|
| Q2 2026 | 37 | $51.7M |
| Q1 2026 | 35 | $12.1M |
| Q4 2025 | 42 | $37.1M |
| Q3 2025 | 38 | $27.0M |
| Q2 2025 | 32 | $13.9M |
| Q1 2025 | 37 | $12.4M |
| Q4 2024 | 43 | $31.8M |
| Q3 2024 | 34 | $19.6M |
| Q2 2024 | 49 | $24.4M |
| Q1 2024 | 82 | $60.7M |
| Q4 2023 | 91 | $35.3M |
| Q3 2023 | 109 | $132.5M |