Security key
046513107
Atara Biotherapeutics, Inc. - Common Stock, par value $0.0001 per share (ATRA)
CUSIP: 046513107
Q4 2019 13F Holders as of 31 Dec 2019
- Security type / class
- Equity / Common Stock, par value $0.0001 per share
- Total 13F shares
- 61,123,347
- Total 13F value
- $1,006,681,660
- Share change
- +2,115,267
- Put/Call ratio
- 238%
- SEC-reported price per share
- $16.47
- Number of holders
- 112
- Value change
- +$38,331,911
- Number of buys
- 61
- Number of sells
- 43
- Shares outstanding
- 9,606,000
Holder snapshot
7 signals
Open additional details 1 more signal available
Security identity
Names, identifiers, and filing context for this profile.
1 source field
Report period
Q4 2019
Institutions
112
Top holders
10
ATRA full security history
Ownership snapshot
Full 13F holder table
Newer quarter: Q3 2025
Atara Biotherapeutics, Inc. SEC filings
Atara Biotherapeutics, Inc. company facts
Broader feeds
Reporting periods
Holder history for CUSIP 046513107
Recent filing periods:
Ownership snapshot
Top reported holders of ATRA - Atara Biotherapeutics, Inc. - Common Stock, par value $0.0001 per share (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
BAUPOST GROUP LLC/MA
Disclosed value leader
BAUPOST GROUP LLC/MA
Comparable rows
15/15
Latest evidence
30 Sep 2019
13F
Lead comparable stake: 86%
Showing 1-6 of 15 holder rows.
Quick read
BAUPOST GROUP LLC/MA leads the comparable SEC ownership view at 86%.
15 of 15 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens BAUPOST GROUP LLC/MA's linked filing trail.
Comparable ownership
Top 5
BAUPOST GROUP LLC/MA
86%
MAVERICK CAPITAL LTD
53%
Redmile Group, LLC
47%
BlackRock Finance, Inc.
46%
VANGUARD GROUP INC
37%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-6 of 15 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| BAUPOST GROUP LLC/MA |
13F
Company
|
86%
|
$117,322,000
8,308,900 shares
|
— | 30 Sep 2019 |
| MAVERICK CAPITAL LTD |
13F
Company
|
53%
|
$72,068,000
5,103,963 shares
|
— | 30 Sep 2019 |
| Redmile Group, LLC |
13F
Company
|
47%
|
$63,818,000
4,519,717 shares
|
— | 30 Sep 2019 |
| BlackRock Finance, Inc. |
13F
Company
|
46%
|
$62,815,000
4,448,656 shares
|
— | 30 Sep 2019 |
| VANGUARD GROUP INC |
13F
Company
|
37%
|
$50,571,000
3,581,453 shares
|
— | 30 Sep 2019 |
| MORGAN STANLEY |
13F
Company
|
31%
|
$41,703,000
2,953,605 shares
|
— | 30 Sep 2019 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
13F holder rows
Institutional holders as of Q4 2019
Investor-level positions for this CUSIP, loaded as an interactive table.
Institutions
112
Shares
61,123,347
Rows available
112
| Investor | Option | Weight % | Change % | SEC-reported value | * Price | Shares | Share Change | Activity | Report Period |
|---|
* SEC-reported price is the security price as of the portfolio date and can indicate the last known price at which the security was still held. The marker flags a reported price that did not pass the local price check.
Compare Q4 2019 vs Q4 2025 Across Filers
Q4 2025 holders
0
Q4 2019 holders
112
Holder diff
112
| Investor | Q4 2025 Shares | Q4 2019 Shares | Share Diff | Share Chg % | Q4 2025 value | Q4 2019 value | Value change | Value Chg % |
|---|
Trend: ostatnie 8 kwartałów (+ wybrane okresy porównania).
Quarterly Holders Trend
Quarterly Value Trend
Quarterly Shares Trend