Security key
046513107
Atara Biotherapeutics, Inc. - Common Stock, par value $0.0001 per share (ATRA)
CUSIP: 046513107
Q1 2022 13F Holders as of 31 Mar 2022
- Security type / class
- Equity / Common Stock, par value $0.0001 per share
- Total 13F shares
- 97,877,569
- Total 13F value
- $909,405,142
- Share change
- +2,720,929
- Put/Call ratio
- 0.83%
- SEC-reported price per share
- $9.29
- Number of holders
- 139
- Value change
- +$12,542,757
- Number of buys
- 72
- Number of sells
- 58
- 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
Q1 2022
Institutions
139
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
31 Dec 2021
13F
Lead comparable stake: 88%
Showing 1-6 of 15 holder rows.
Quick read
BAUPOST GROUP LLC/MA leads the comparable SEC ownership view at 88%.
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
88%
MAVERICK CAPITAL LTD
82%
BlackRock Finance, Inc.
81%
JPMORGAN CHASE & CO
77%
VANGUARD GROUP INC
74%
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
|
88%
|
$133,605,000
8,477,488 shares
|
— | 31 Dec 2021 |
| MAVERICK CAPITAL LTD |
13F
Company
|
82%
|
$123,808,000
7,855,824 shares
|
— | 31 Dec 2021 |
| BlackRock Finance, Inc. |
13F
Company
|
81%
|
$123,190,000
7,816,552 shares
|
— | 31 Dec 2021 |
| JPMORGAN CHASE & CO |
13F
Company
|
77%
|
$116,894,000
7,417,122 shares
|
— | 31 Dec 2021 |
| VANGUARD GROUP INC |
13F
Company
|
74%
|
$111,510,000
7,075,521 shares
|
— | 31 Dec 2021 |
| Redmile Group, LLC |
13F
Company
|
67%
|
$101,459,000
6,437,777 shares
|
— | 31 Dec 2021 |
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 Q1 2022
Investor-level positions for this CUSIP, loaded as an interactive table.
Institutions
139
Shares
97,877,569
Rows available
139
| 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 Q1 2022 vs Q4 2025 Across Filers
Q4 2025 holders
0
Q1 2022 holders
139
Holder diff
139
| Investor | Q4 2025 Shares | Q1 2022 Shares | Share Diff | Share Chg % | Q4 2025 value | Q1 2022 value | Value change | Value Chg % |
|---|
Trend: ostatnie 8 kwartałów (+ wybrane okresy porównania).
Quarterly Holders Trend
Quarterly Value Trend
Quarterly Shares Trend