Security key
046513107
Atara Biotherapeutics, Inc. - Common Stock, par value $0.0001 per share (ATRA)
CUSIP: 046513107
Q2 2021 13F Holders as of 30 Jun 2021
- Security type / class
- Equity / Common Stock, par value $0.0001 per share
- Total 13F shares
- 85,946,359
- Total 13F value
- $1,336,531,861
- Share change
- -826,013
- Put/Call ratio
- 118%
- SEC-reported price per share
- $15.55
- Number of holders
- 144
- Value change
- -$10,054,279
- Number of buys
- 61
- Number of sells
- 75
- 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
Q2 2021
Institutions
144
Top holders
10
ATRA full security history
Ownership snapshot
Full 13F holder table
Newer quarter: Q3 2021
Previous quarter: Q1 2021
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 Mar 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%
BlackRock Finance, Inc.
72%
Redmile Group, LLC
72%
MAVERICK CAPITAL LTD
70%
JPMORGAN CHASE & CO
70%
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%
|
$121,737,000
8,477,488 shares
|
— | 31 Mar 2021 |
| BlackRock Finance, Inc. |
13F
Company
|
72%
|
$99,790,000
6,949,109 shares
|
— | 31 Mar 2021 |
| Redmile Group, LLC |
13F
Company
|
72%
|
$98,872,000
6,885,233 shares
|
— | 31 Mar 2021 |
| MAVERICK CAPITAL LTD |
13F
Company
|
70%
|
$96,778,000
6,739,402 shares
|
— | 31 Mar 2021 |
| JPMORGAN CHASE & CO |
13F
Company
|
70%
|
$96,332,000
6,708,372 shares
|
— | 31 Mar 2021 |
| VANGUARD GROUP INC |
13F
Company
|
66%
|
$91,226,000
6,352,807 shares
|
— | 31 Mar 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 Q2 2021
Investor-level positions for this CUSIP, loaded as an interactive table.
Institutions
144
Shares
85,946,359
Rows available
144
| 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 Q2 2021 vs Q1 2021 Across Filers
Q1 2021 holders
148
Q2 2021 holders
144
Holder diff
-4
| Investor | Q1 2021 Shares | Q2 2021 Shares | Share Diff | Share Chg % | Q1 2021 value | Q2 2021 value | Value change | Value Chg % |
|---|
Trend: ostatnie 8 kwartałów (+ wybrane okresy porównania).
Quarterly Holders Trend
Quarterly Value Trend
Quarterly Shares Trend