$4.86
+0.26 (+5.65%)
Market Cap
$40.8M
Shares Outstanding
8,178,110
Institutional Holders
37
Total Inst. Value
$12.4M
% of Float Held
49.1%
QoQ Holder Change
—
Institutional data as of Q1 2025
Top 10 Institutional Holders(Q1 2025)
| # | Fund | Value | Shares |
|---|---|---|---|
| 1 | EcoR1 Capital, LLC | $3.4M | 573,183 |
| 2 | Redmile Group, LLC | $2.6M | 441,701 |
| 3 | VANGUARD GROUP INC | $1.1M | 190,761 |
| 4 | BANK OF AMERICA CORP /DE/ | $1.1M | 187,297 |
| 5 | ACADIAN ASSET MANAGEMENT LLC | $682K | 115,111 |
| 6 | Vestal Point Capital, LP | $559K | 94,085 |
| 7 | STALEY CAPITAL ADVISERS INC | $475K | 80,000 |
| 8 | TANG CAPITAL MANAGEMENT LLC | $447K | 75,196 |
| 9 | BlackRock, Inc. | $361K | 60,798 |
| 10 | GEODE CAPITAL MANAGEMENT, LLC | $347K | 58,679 |
Biggest Buyers & Sellers This Quarter
Top Buyers
| Fund | Shares Added | Value |
|---|---|---|
| EcoR1 Capital, LLC | +41K | $3.4M |
| VANGUARD GROUP INC | +12K | $1.1M |
| STALEY CAPITAL ADVISERS INC | +30K | $475K |
| GEODE CAPITAL MANAGEMENT, LLC | +4K | $347K |
| UBS Group AG | +24K | $145K |
Top Sellers
| Fund | Shares Removed | Value |
|---|---|---|
| RENAISSANCE TECHNOLOGIES LLC | -50K | $104K |
| Vestal Point Capital, LP | -31K | $559K |
| BANK OF AMERICA CORP /DE/ | -18K | $1.1M |
| MORGAN STANLEY | -17K | $69K |
| FMR LLC | -10K | $101K |
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Frequently Asked Questions
How many institutional investors hold ATRA?
As of Q1 2025, 37 institutional investors report holding ATRA (Atara Biotherapeutics, Inc.) in their 13F filings.
What percentage of Atara Biotherapeutics, Inc. is owned by institutions?
Institutional investors hold approximately 49.1% of Atara Biotherapeutics, Inc.'s float as reported in SEC 13F filings.
Which hedge fund owns the most ATRA?
The largest institutional holder of ATRA is EcoR1 Capital, LLC with $3.4M in shares.
Are institutions buying or selling ATRA?
This quarter, 5 institutions opened new positions in ATRA and 9 closed their positions.
What is 13F institutional ownership?
SEC Form 13F is a quarterly report filed by institutional investment managers with over $100M in qualifying assets. It discloses their US equity holdings, providing transparency into what the largest investors are buying and selling.
How often is institutional ownership data updated?
13F filings are due 45 days after each calendar quarter end (May 15, Aug 14, Nov 14, Feb 14). Data is updated on HedgeTrace as new filings are processed.