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

CUSIP 046513107 is the security identifier for ATRA - Atara Biotherapeutics, Inc. - Common Stock used to aggregate holder disclosures.

How many institutions held ATRA - Atara Biotherapeutics, Inc. - Common Stock in Q2 2015?

74 institutional investors reported ATRA - Atara Biotherapeutics, Inc. - Common Stock for Q2 2015. Use the holders table for investor-level position and value details.

Atara Biotherapeutics, Inc. - Common Stock (ATRA)

CUSIP: 046513107

Q2 2015 13F Holders as of 30 Jun 2015

Type / Class: Equity / Common Stock
Shares outstanding: 8,165,808
Total 13F shares: 13,191,481
Share change: +1,962,222
Total reported value: $695,961,994
Put/Call ratio: 250%
Price per share: $52.76
Number of holders: 74
Value change: +$107,658,520
Number of buys: 66
Number of sells: 13

Quarterly Holders Quick Answers

What is CUSIP 046513107?
CUSIP 046513107 identifies ATRA - Atara Biotherapeutics, Inc. - Common Stock in SEC institutional holdings data.

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Newer quarter: Q3 2015
Previous quarter: Q1 2015

Recent filing periods for CUSIP 046513107:

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Top shareholders of ATRA - Atara Biotherapeutics, Inc. - Common Stock (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	58%	4,763,265	$192,802,000	—	31 Mar 2015	13F
EcoR1 Capital, LLC	13F	Company	13%	1,063,189	$44,197,000	—	31 Mar 2015	13F
Visium Asset Management, LP	13F	Company	11%	910,000	$37,828,000	—	31 Mar 2015	13F
FMR LLC	13F	Company	8.5%	693,833	$28,843,000	—	31 Mar 2015	13F
JENNISON ASSOCIATES LLC	13F	Company	7.3%	594,758	$24,724,000	—	31 Mar 2015	13F
BRIDGER MANAGEMENT, LLC	13F	Company	5.8%	474,835	$19,739,000	—	31 Mar 2015	13F
Neuberger Berman Group LLC	13F	Company	5.5%	446,777	$18,573,000	—	31 Mar 2015	13F
Redmile Group, LLC	13F	Company	3.2%	265,205	$11,025,000	—	31 Mar 2015	13F
EverPoint Asset Management, LLC	13F	Company	3.1%	252,349	$10,490,000	—	31 Mar 2015	13F
VANGUARD GROUP INC	13F	Company	2.7%	216,488	$8,999,000	—	31 Mar 2015	13F
BlackRock Fund Advisors	13F	Company	2.4%	193,726	$8,053,000	—	31 Mar 2015	13F
TIVERTON ASSET MANAGEMENT LLC	13F	Company	2.3%	190,000	$7,898,000	—	31 Mar 2015	13F
UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC	13F	Company	1.9%	154,124	$6,407,000	—	31 Mar 2015	13F
JPMORGAN CHASE & CO	13F	Company	1.8%	144,150	$5,993,000	—	31 Mar 2015	13F
ArrowMark Colorado Holdings LLC	13F	Company	1.5%	122,134	$5,077,000	—	31 Mar 2015	13F
BAMCO INC /NY/	13F	Company	1.5%	120,844	$5,023,000	—	31 Mar 2015	13F
BlackRock Institutional Trust Company, N.A.	13F	Company	0.89%	72,857	$3,029,000	—	31 Mar 2015	13F
STATE STREET CORP	13F	Company	0.88%	71,612	$2,974,000	—	31 Mar 2015	13F
NORTHERN TRUST CORP	13F	Company	0.86%	69,912	$2,906,000	—	31 Mar 2015	13F
SPHERA FUNDS MANAGEMENT LTD.	13F	Company	0.78%	63,579	$2,643,000	—	31 Mar 2015	13F
GEODE CAPITAL MANAGEMENT, LLC	13F	Company	0.7%	57,002	$2,369,000	—	31 Mar 2015	13F
Bank of New York Mellon Corp	13F	Company	0.37%	29,978	$1,246,000	—	31 Mar 2015	13F
CITIGROUP INC	13F	Company	0.32%	26,149	$1,087,000	—	31 Mar 2015	13F
Point72 Asset Management, L.P.	13F	Company	0.31%	25,100	$1,043,000	—	31 Mar 2015	13F
NORGES BANK	13F	Company	0.31%	25,010	$1,040,000	—	31 Mar 2015	13F
Absolute Return Capital, LLC	13F	Company	0.29%	23,986	$997,000	—	31 Mar 2015	13F
CHARLES SCHWAB INVESTMENT MANAGEMENT INC	13F	Company	0.26%	21,015	$874,000	—	31 Mar 2015	13F
BlackRock Investment Management, LLC	13F	Company	0.25%	20,353	$846,000	—	31 Mar 2015	13F
TIAA CREF INVESTMENT MANAGEMENT LLC	13F	Company	0.23%	19,121	$795,000	—	31 Mar 2015	13F
BOGLE INVESTMENT MANAGEMENT L P /DE/	13F	Company	0.17%	13,643	$567,000	—	31 Mar 2015	13F
A.R.T. Advisors, LLC	13F	Company	0.15%	12,624	$524,000	—	31 Mar 2015	13F
CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM	13F	Company	0.15%	12,600	$524,000	—	31 Mar 2015	13F
CADENCE CAPITAL MANAGEMENT LLC	13F	Company	0.13%	10,265	$427,000	—	31 Mar 2015	13F
TEACHERS ADVISORS, LLC	13F	Company	0.12%	9,803	$408,000	—	31 Mar 2015	13F
ALLIANCEBERNSTEIN L.P.	13F	Company	0.07%	6,100	$254,000	—	31 Mar 2015	13F
FRED ALGER MANAGEMENT, LLC	13F	Company	0.07%	5,400	$224,000	—	31 Mar 2015	13F
BLACKROCK ADVISORS LLC	13F	Company	0.06%	4,857	$202,000	—	31 Mar 2015	13F
Nationwide Fund Advisors	13F	Company	0.06%	4,531	$188,000	—	31 Mar 2015	13F
AMERICAN INTERNATIONAL GROUP, INC.	13F	Company	0.04%	3,615	$150,276	—	31 Mar 2015	13F
B. Riley Wealth Management, Inc.	13F	Company	0.04%	3,000	$124,000	—	31 Mar 2015	13F
MANUFACTURERS LIFE INSURANCE COMPANY, THE	13F	Company	0.03%	2,741	$114,000	—	31 Mar 2015	13F
STRS OHIO	13F	Company	0.03%	2,300	$95,000	—	31 Mar 2015	13F
Cubist Systematic Strategies, LLC	13F	Company	0.02%	1,717	$71,000	—	31 Mar 2015	13F
WELLS FARGO & COMPANY/MN	13F	Company	0.01%	1,015	$42,000	—	31 Mar 2015	13F
UBS Group AG	13F	Company	0.01%	1,000	$42,000	—	31 Mar 2015	13F
BARCLAYS PLC	13F	Company	0%	209	$8,000	—	31 Mar 2015	13F
Tower Research Capital LLC (TRC)	13F	Company	0%	183	$8,000	—	31 Mar 2015	13F
BNP PARIBAS FINANCIAL MARKETS	13F	Company	0%	161	$6,693	—	31 Mar 2015	13F
BlackRock Finance, Inc.	13F	Company	0%	148	$6,000	—	31 Mar 2015	13F
MORGAN STANLEY	13F	Company	0%	90	$4,000	—	31 Mar 2015	13F

Institutional Holders of Atara Biotherapeutics, Inc. - Common Stock (ATRA) as of Q2 2015

As of 30 Jun 2015, Atara Biotherapeutics, Inc. - Common Stock (ATRA) was held by 74 institutional shareholders that filed Form 13F with the SEC. Together, they reported ownership of 13,191,481 shares. The largest 10 holders included BAUPOST GROUP LLC/MA, EcoR1 Capital, LLC, FMR LLC, Visium Asset Management, LP, UBS GLOBAL ASSET MANAGEMENT AMERICAS INC, JENNISON ASSOCIATES LLC, BRIDGER MANAGEMENT, LLC, Neuberger Berman Group LLC, Redmile Group, LLC, and VANGUARD GROUP INC. This page lists 74 institutional shareholders reporting positions in this security for the Q2 2015 filing period.

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

Compare Q2 2015 vs Q1 2015 Across Filers

Q1 2015 holders

Q2 2015 holders

Holder diff

Investor	Q1 2015 Shares	Q2 2015 Shares	Share Diff	Share Chg %	Q1 2015 Value $	Q2 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.