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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
1612094	G. Mitchall Clark	611 Gateway Boulevard Suite 900 South San Francisco CA 94080	Evp & Chief R & Qa Officer	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	Explanation
Common Stock	Acquisiton	2017-02-15	7,211	$0.00	152,720	No	4	M	Direct
Common Stock	Disposition	2017-02-16	3,059	$15.96	149,661	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	M	Direct
No	4	S	Direct

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Restricted Stock Unites	Disposition	2017-02-15	7,211	$0.00	7,211	$0.00

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
33,654			No	4	M	Direct

Footnotes

Shares issued upon settlement of vested restricted stock units ("RSUs").
Includes 822 shares issued on November 30, 2016 pursuant to the Issuer's Employee Stock Purchase Plan.
Shares sold to cover tax obligation from settlement of vested restricted stock units.
Transaction pursuant to Rule 10b5-1 Plan adopted October 12, 2016.
Each restricted stock unit represents a contingent right to receive one share of the Issuer's common stock or a cash settlement.
The RSUs were granted with both (a) a liquidity event-based vesting condition and (b) a service-based vesting condition, both of which conditions must be satisfied in order for the RSUs to vest. The liquidity event-based condition was satisfied upon the closing of the Issuer's initial public offering (the "IPO"). The shares that vested on the closing date of the IPO, and the shares that vested thereafter through May 15, 2015, were settled on May 15, 2015. The service-based vesting condition provides that 25% of the total number of shares on March 17, 2015 and 1/48th of the total number of shares monthly thereafter, subject to the holder's continuous service through each such date.
The earlier of (i) March 27, 2021 or (ii) the recepient's termination date.