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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	2015-03-09	2,500	$29.32	2,500	No	4	P	Indirect	Held by the Joel S. Marcus and Barbara A. Marcus Family Trust
Common Stock	Acquisiton	2015-03-10	1,500	$29.99	4,000	No	4	P	Indirect	Held by the Joel S. Marcus and Barbara A. Marcus Family Trust

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	P	Indirect	Held by the Joel S. Marcus and Barbara A. Marcus Family Trust
No	4	P	Indirect	Held by the Joel S. Marcus and Barbara A. Marcus Family Trust

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Common Stock	908,355	Indirect	See Footnote

Footnotes

The shares were purchased at prices ranging from $28.95 to $29.35. The reporting person will provide upon request to the SEC, the issuer or any security holder of the issuer, full information regarding the number of shares purchased at each separate price.
The shares were purchased at prices ranging from $29.97 to $30.00. The reporting person will provide upon request to the SEC, the issuer or any security holder of the issuer, full information regarding the number of shares purchased at each separate price.