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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	Insider Title	Director	Officer	Large Shareholder	Other
1216955	S Joel Marcus	C/O Alexandria Real Estate Equities, Inc 385 East Colorado Boulevard, Suite 299 Pasadena CA 91101		Yes	No	No	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	256,410	$0.00	256,410	No	4	C	Indirect	See Footnote
Common Stock	Acquisiton	2014-10-21	501,945	$0.00	758,355	No	4	C	Indirect	See Footnote
Common Stock	Acquisiton	2014-10-21	150,000	$11.00	908,355	No	4	P	Indirect	See Footnote

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	C	Indirect	See Footnote
No	4	C	Indirect	See Footnote
No	4	P	Indirect	See Footnote

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	256,410	$0.00	256,410	$0.00
Common Stock	Series B Preferred Stock	Disposition	2014-10-21	501,945	$0.00	501,945	$0.00

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

Footnotes

The Series A Preferred Stock had no expiration date and each share of Series A Preferred Stock was automatically converted into common stock on a 1-for-1 basis upon the consummation of the Issuer's initial public offering.
Consists of shares of common stock held by Alexandria Equities, LLC. Mr. Marcus is the Chairman, CEO and Founder of Alexandria Real Estate Equities, Inc., which is the managing member of Alexandria Equities, LLC, which has full voting and investment power with respect to the shares owned by Alexandria Equities, LLC. As an officer of Alexandria Real Estate Equities, Inc., Mr. Marcus may be deemed to have voting and investment power with respect to the shares owned by Alexandria Equities, LLC. Mr. Marcus disclaims beneficial ownership of the shares held by Alexandria Equities, LLC, except to the extent of his underlying pecuniary interest therein.
The Series B Preferred Stock had no expiration date and each share of Series B Preferred Stock was automatically converted into common stock on a 1-for-1 basis upon the consummation of the Issuer's initial public offering.