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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
1612095	Christopher Haqq	611 Gateway Boulevard Suite 900 South San Francisco CA 94080	Evp, R&D & Chief Scientific Of	No	Yes	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership
Common Stock	Disposition	2019-02-06	2,677	$38.04	282,903	No	4	S	Direct
Common Stock	Disposition	2019-02-06	9,698	$38.78	273,205	No	4	S	Direct
Common Stock	Disposition	2019-02-06	1,512	$38.47	271,693	No	4	F	Direct
Common Stock	Acquisiton	2019-02-06	15,000	$0.00	286,693	No	4	A	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership
No	4	S	Direct
No	4	S	Direct
No	4	F	Direct
No	4	A	Direct

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Employee Stock Option (Right to Buy)	Acquisiton	2019-02-06	30,000	$0.00	30,000	$38.47

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
30,000		2029-02-05	No	4	A	Direct

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Common Stock	17,312	Indirect	See footnote
Common Stock	2,688	Indirect	See footnote

Footnotes

Transaction pursuant to Rule 10b5-1 Plan adopted January 25, 2018.
The price in Column 4 is a weighted average sale price. The prices actually received ranged from $37.61 to $38.54. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range.
The price in Column 4 is a weighted average sale price. The prices actually received ranged from $38.67 to $38.89. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range.
Shares withheld to cover tax obligation from settlement of vested restricted stock units.
These restricted stock units vest in four equal annual installments on each of the first, second, third and fourth anniversaries of the grant date, subject to the reporting person's continuous service.
The shares are held by the Chris Haqq 2014 GRAT, of which the Reporting Person is trustee.
The shares are held by The Havenside Trust, of which the Reporting Person is trustee.
1/48th of the shares subject to the stock option vest and become exercisable each month following February 6, 2019, subject to the reporting person's continuous service.