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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1604464	Atara Biotherapeutics Inc.	ATRA	Biological Products, (No Disgnostic Substances) (2836)	460920988

Insiders

Cik	Name	Reported Address	Director	Officer	Large Shareholder	Other
1013425	I Jesse Treu	C/O Domain Associates, Llc One Palmer Square Princeton NJ 08542	No	No	Yes	No
1024000	C James Blair	C/O Domain Associates, Llc One Palmer Square Princeton NJ 08542	No	No	Yes	No
1196863	Nicole Vitullo	C/O Domain Associates, Llc One Palmer Square Princeton NJ 08542	No	No	Yes	No
1207786	H Brian Dovey	C/O Domain Associates, Llc One Palmer Square Princeton NJ 08542	No	No	Yes	No
1207789	K Kathleen Schoemaker	C/O Domain Associates, Llc One Palmer Square Princeton NJ 08542	No	No	Yes	No
1354718	K Brian Halak	C/O Domain Associates, Llc One Palmer Square Princeton NJ 08542	No	No	Yes	No
1465143	Dp Viii Associates, L.p.	C/O Domain Associates, Llc One Palmer Square Princeton NJ 08542	No	No	Yes	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock	Acquisiton	2014-10-21	14,049	$0.00	14,049	No	4	C	Direct
Common Stock	Acquisiton	2014-10-21	1,841	$11.00	15,890	No	4	P	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	C	Direct
No	4	P	Direct

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Series A Preferred Stock	Disposition	2014-10-21	9,443	$0.00	9,443	$0.00
Common Stock	Series B Preferred Stock	Disposition	2014-10-21	4,606	$0.00	4,606	$0.00

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
0			No	4	C	Direct
0			No	4	C	Direct

Footnotes

The securities reported as directly beneficially owned by the designated Reporting Person may be deemed to be indirectly beneficially owned by each of the Reporting Owners listed below, each of whom is a managing member of One Palmer Square Associates VIII, LLC, the sole general partner of the designated Reporting Person. Pursuant to Instruction 4(b)(iv) of Form 4, each such individual has elected to report as indirectly beneficially owned the entire number of securities owned by the designated Reporting Person, however each of them disclaims beneficial ownership of any securities, and any proceeds thereof, that exceed his or her pecuniary interest therein and/or that are not actually distributed to him or her.
As managing members of the sole general partner of Domain Partners VIII, L.P., each Reporting Owner listed below may also be deemed to indirectly beneficially own the securities of the Issuer held by Domain Partners VIII, L.P., as reported on a Form 4 for Domain Partners VIII, L.P. filed on the same date as this Form 4.
All outstanding shares of the Issuer's preferred stock automatically converted into Common Stock upon the closing of the Issuer's initial public offering for no additional consideration. The preferred stock had no expiration date.