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 Q1 2015?

52 institutional investors reported ATRA - Atara Biotherapeutics, Inc. - Common Stock, par value $0.0001 per share for Q1 2015. Use the holders table for investor-level position and value details.

CUSIP: 046513107

Q1 2015 13F Holders as of 31 Mar 2015

Type / Class: Equity / Common Stock, par value $0.0001 per share
Shares outstanding: 9,606,000
Total 13F shares: 11,227,473
Share change: +4,502,013
Total reported value: $461,513,969
Price per share: $41.57
Number of holders: 52
Value change: +$185,585,180
Number of buys: 41
Number of sells: 11

Security key

046513107

Report period

Q1 2015

Institutions

Top holders

ATRA full security history Newer quarter: Q2 2015 Previous quarter: Q4 2014 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: Q2 2015 Previous quarter: Q4 2014

Recent filing periods:

Q1 2026 Q4 2025 Q3 2025 Q1 2025 Q4 2024 Q3 2024 Q2 2024 Q1 2024

Top shareholders 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. Ownership % is shown only when it is directly reported or safely comparable across share classes.

Methodology: rows are grouped by holder and ranked by the holder's primary source value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.

Holder	Source	Role / Reporting	Ownership %	Shares	Holdings Value	12M Net Δ	As of	Details
BAUPOST GROUP LLC/MA	13F	Company	26%	2,495,913	$59,137,000	—	31 Dec 2014	13F
FMR LLC	13F	Company	14%	1,348,015	$36,059,000	—	31 Dec 2014	13F
Visium Asset Management, LP	13F	Company	7.2%	690,148	$18,462,000	—	31 Dec 2014	13F
EcoR1 Capital, LLC	13F	Company	4%	385,124	$10,133,000	—	31 Dec 2014	13F
JENNISON ASSOCIATES LLC	13F	Company	3.1%	293,695	$7,856,000	—	31 Dec 2014	13F
Redmile Group, LLC	13F	Company	2.8%	264,266	$7,069,000	—	31 Dec 2014	13F
BRIDGER MANAGEMENT, LLC	13F	Company	2.5%	243,450	$6,512,000	—	31 Dec 2014	13F
BlackRock Fund Advisors	13F	Company	1.6%	157,919	$4,224,000	—	31 Dec 2014	13F
JPMORGAN CHASE & CO	13F	Company	1.6%	150,250	$4,019,000	—	31 Dec 2014	13F
VANGUARD GROUP INC	13F	Company	1.3%	129,146	$3,454,000	—	31 Dec 2014	13F
TIVERTON ASSET MANAGEMENT LLC	13F	Company	1%	100,000	$2,675,000	—	31 Dec 2014	13F
NORTHERN TRUST CORP	13F	Company	0.6%	58,074	$1,554,000	—	31 Dec 2014	13F
UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC	13F	Company	0.6%	57,308	$1,533,000	—	31 Dec 2014	13F
GOLDMAN SACHS GROUP INC	13F	Company	0.55%	52,508	$1,405,000	—	31 Dec 2014	13F
BlackRock Institutional Trust Company, N.A.	13F	Company	0.46%	44,311	$1,185,000	—	31 Dec 2014	13F
Neuberger Berman Group LLC	13F	Company	0.43%	41,276	$1,104,000	—	31 Dec 2014	13F
STATE STREET CORP	13F	Company	0.4%	37,976	$1,015,000	—	31 Dec 2014	13F
NORGES BANK	13F	Company	0.39%	37,932	$1,015,000	—	31 Dec 2014	13F
GEODE CAPITAL MANAGEMENT, LLC	13F	Company	0.37%	35,184	$941,000	—	31 Dec 2014	13F
Bank of New York Mellon Corp	13F	Company	0.21%	19,944	$534,000	—	31 Dec 2014	13F
BlackRock Investment Management, LLC	13F	Company	0.17%	16,201	$433,000	—	31 Dec 2014	13F
CHARLES SCHWAB INVESTMENT MANAGEMENT INC	13F	Company	0.13%	12,523	$335,000	—	31 Dec 2014	13F
CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM	13F	Company	0.11%	10,700	$286,000	—	31 Dec 2014	13F
Cubist Systematic Strategies, LLC	13F	Company	0.11%	10,349	$277,000	—	31 Dec 2014	13F
SUSQUEHANNA INTERNATIONAL GROUP, LLP	13F	Company	0.1%	9,202	$246,000	—	31 Dec 2014	13F
Nationwide Fund Advisors	13F	Company	0.04%	4,200	$112,000	—	31 Dec 2014	13F
AMERICAN INTERNATIONAL GROUP, INC.	13F	Company	0.04%	3,615	$96,701	—	31 Dec 2014	13F
TEACHERS ADVISORS, LLC	13F	Company	0.03%	3,177	$85,000	—	31 Dec 2014	13F
TIAA CREF INVESTMENT MANAGEMENT LLC	13F	Company	0.03%	2,886	$77,000	—	31 Dec 2014	13F
BLACKROCK ADVISORS LLC	13F	Company	0.03%	2,565	$69,000	—	31 Dec 2014	13F
STRS OHIO	13F	Company	0.02%	2,000	$54,000	—	31 Dec 2014	13F
Tower Research Capital LLC (TRC)	13F	Company	0.01%	1,094	$29,000	—	31 Dec 2014	13F
UBS Group AG	13F	Company	0.01%	1,094	$29,000	—	31 Dec 2014	13F
CITIGROUP INC	13F	Company	0.01%	986	$26,000	—	31 Dec 2014	13F
MORGAN STANLEY	13F	Company	0.01%	764	$20,000	—	31 Dec 2014	13F
WELLS FARGO & COMPANY/MN	13F	Company	0.01%	600	$16,000	—	31 Dec 2014	13F
BARCLAYS PLC	13F	Company	0%	467	$12,000	—	31 Dec 2014	13F
CT Financial Advisors LLC	13F	Company	0%	400	$10,700	—	31 Dec 2014	13F
BlackRock Finance, Inc.	13F	Company	0%	148	$4,000	—	31 Dec 2014	13F

Institutional Holders of Atara Biotherapeutics, Inc. - Common Stock, par value $0.0001 per share (ATRA) as of Q1 2015

As of 31 Mar 2015, Atara Biotherapeutics, Inc. - Common Stock, par value $0.0001 per share (ATRA) was held by 52 institutional shareholders that filed Form 13F with the SEC. Together, they reported ownership of 11,227,473 shares. The largest 10 holders included BAUPOST GROUP LLC/MA, EcoR1 Capital, LLC, Visium Asset Management, LP, FMR LLC, JENNISON ASSOCIATES LLC, BRIDGER MANAGEMENT, LLC, Neuberger Berman Group LLC, Redmile Group, LLC, EverPoint Asset Management, LLC, and VANGUARD GROUP INC. This page lists 52 institutional shareholders reporting positions in this security for the Q1 2015 filing period.

Investor	Option	Weight %	Change %	Value $	* Price	Shares	Share Change	Activity	Report Period

Compare Q1 2015 vs Q4 2014 Across Filers

Q4 2014 holders

Q1 2015 holders

Holder diff

Investor	Q4 2014 Shares	Q1 2015 Shares	Share Diff	Share Chg %	Q4 2014 Value $	Q1 2015 Value $	Value Diff $	Value Chg %

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

Quarterly Holders Trend

Quarterly Value Trend

Quarterly Shares Trend

* Reported Price is the price of the security as of the portfolio date. This value is significant in that it is the last known price at which the security was still held.
An asterisk sign (*) next to the price indicates that the price is likely invalid.