Atara Biotherapeutics, Inc. - Common Stock, par value $0.0001 per share (ATRA)

Q: What does CUSIP 046513107 represent in this 13F holders report?

CUSIP 046513107 is the security identifier for ATRA - Atara Biotherapeutics, Inc. - Common Stock, par value $0.0001 per share used to aggregate holder disclosures.

Q: How many institutions held ATRA - Atara Biotherapeutics, Inc. - Common Stock, par value $0.0001 per share in Q2 2023?

115 institutional investors reported ATRA - Atara Biotherapeutics, Inc. - Common Stock, par value $0.0001 per share for Q2 2023. Use the holders table for investor-level position and value details.

CUSIP: 046513107

Q2 2023 13F Holders as of 30 Jun 2023

Security type / class: Equity / Common Stock, par value $0.0001 per share
Total 13F shares: 90,354,566
Total 13F value: $145,469,168
Share change: -12,049,015
Put/Call ratio: 2.1%
SEC-reported price per share: $1.61
Number of holders: 115
Value change: -$23,260,244
Number of buys: 57
Number of sells: 70
Shares outstanding: 9,606,000

Security key

046513107

Report period

Q2 2023

Institutions

115

Top holders

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

Latest 13F filings Latest 13D/G filings Investors directory

Reporting periods

Holder history for CUSIP 046513107

Newer quarter: Q3 2025

Recent filing periods:

Q2 2026 Q1 2026 Q4 2025 Q3 2025

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

BlackRock Finance, Inc.

Disclosed value leader

BlackRock Finance, Inc.

Comparable rows

0/15

Latest evidence

31 Mar 2023

13F Highest disclosed value: $26,886,765 15 rows are not safely comparable across share classes. Showing 1-6 of 15 holder rows.

Quick read

BlackRock Finance, Inc. has the largest disclosed position value at $26.89M.

0 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 BlackRock Finance, Inc.'s linked filing trail.

Disclosed position value Top 5

BlackRock Finance, Inc. $26.89M

BAUPOST GROUP LLC/MA $26.46M

WASATCH ADVISORS LP $24.23M

STATE STREET CORP $23.89M

JPMORGAN CHASE & CO $22.2M

Value bars compare disclosed positions; verify each figure against the linked filing evidence.

Detailed SEC evidence table Showing 1-6 of 15 holder rows

Holder	Evidence	Ownership %	Position	12M Net Δ	As of
BlackRock Finance, Inc.	13F Company 13F	— denominator unverified	$26,886,765 9,271,298 shares	—	31 Mar 2023
BAUPOST GROUP LLC/MA	13F Company 13F	— denominator unverified	$26,458,000 9,123,616 shares	—	31 Mar 2023
WASATCH ADVISORS LP	13F Company 13F	— denominator unverified	$24,227,531 8,354,321 shares	—	31 Mar 2023
STATE STREET CORP	13F Company 13F	— denominator unverified	$23,888,672 8,237,473 shares	—	31 Mar 2023
JPMORGAN CHASE & CO	13F Company 13F	— denominator unverified	$22,201,000 7,655,769 shares	—	31 Mar 2023
VANGUARD GROUP INC	13F Company 13F	— denominator unverified	$19,880,040 6,855,186 shares	—	31 Mar 2023

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 2023

Investor-level positions for this CUSIP, loaded as an interactive table.

Institutions

115

90,354,566

Rows available

115

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 2023 vs Q1 2026 Across Filers

Q1 2026 holders

Q2 2023 holders

115

Holder diff

114

Investor	Q1 2026 Shares	Q2 2023 Shares	Share Diff	Share Chg %	Q1 2026 value	Q2 2023 value	Value change	Value Chg %

Trend: ostatnie 8 kwartałów (+ wybrane okresy porównania).

Quarterly Holders Trend

Quarterly Value Trend

Quarterly Shares Trend