Security key
046513107
Atara Biotherapeutics, Inc. - Common Stock, par value $0.0001 per share (ATRA)
CUSIP: 046513107
Q1 2021 13F Holders as of 31 Mar 2021
- Security type / class
- Equity / Common Stock, par value $0.0001 per share
- Total 13F shares
- 85,650,758
- Total 13F value
- $1,229,931,921
- Share change
- +59,612
- Put/Call ratio
- 30%
- SEC-reported price per share
- $14.36
- Number of holders
- 148
- Value change
- -$3,128,334
- Number of buys
- 80
- Number of sells
- 60
- 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 2021
Institutions
148
Top holders
10
ATRA full security history
Ownership snapshot
Full 13F holder table
Newer quarter: Q2 2021
Previous quarter: Q4 2020
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 2020
13F
Lead comparable stake: 95%
Showing 1-6 of 15 holder rows.
Quick read
BAUPOST GROUP LLC/MA leads the comparable SEC ownership view at 95%.
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
95%
MAVERICK CAPITAL LTD
76%
Redmile Group, LLC
71%
BlackRock Finance, Inc.
67%
JPMORGAN CHASE & CO
65%
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
|
95%
|
$178,809,000
9,108,988 shares
|
— | 31 Dec 2020 |
| MAVERICK CAPITAL LTD |
13F
Company
|
76%
|
$143,781,000
7,324,539 shares
|
— | 31 Dec 2020 |
| Redmile Group, LLC |
13F
Company
|
71%
|
$134,722,000
6,863,070 shares
|
— | 31 Dec 2020 |
| BlackRock Finance, Inc. |
13F
Company
|
67%
|
$126,700,000
6,454,415 shares
|
— | 31 Dec 2020 |
| JPMORGAN CHASE & CO |
13F
Company
|
65%
|
$121,858,000
6,207,767 shares
|
— | 31 Dec 2020 |
| VANGUARD GROUP INC |
13F
Company
|
59%
|
$110,680,000
5,638,274 shares
|
— | 31 Dec 2020 |
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 2021
Investor-level positions for this CUSIP, loaded as an interactive table.
Institutions
148
Shares
85,650,758
Rows available
148
| 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 2021 vs Q4 2020 Across Filers
Q4 2020 holders
144
Q1 2021 holders
148
Holder diff
4
| Investor | Q4 2020 Shares | Q1 2021 Shares | Share Diff | Share Chg % | Q4 2020 value | Q1 2021 value | Value change | Value Chg % |
|---|
Trend: ostatnie 8 kwartałów (+ wybrane okresy porównania).
Quarterly Holders Trend
Quarterly Value Trend
Quarterly Shares Trend