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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1604464	Atara Biotherapeutics Inc.	ATRA	()	4

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1329959	Giltner Carol Gallagher	C/O Atara Biotherapeutics, Inc. 611 Gateway Boulevard, Suite 900 South San Francisco CA 94080		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	2018-05-15	545	$0.00	111,465	No	4	M	Direct
Common Stock	Disposition	2018-05-16	273	$46.06	111,192	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 Units	Disposition	2018-05-15	545	$0.00	545	$0.00

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

Footnotes

Shares issued upon settlement of vested restricted stock units.
Transaction pursuant to Rule 10b5-1 Plan adopted October 14, 2016.
Each restricted stock unit represents a contingent right to receive one share of the Issuer's common stock or a cash settlement.
The restricted stock units ("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 August 17, 2015, were settled on August 17, 2015. The service-based vesting condition provides that 1/48th of the total number of shares vest monthly from March 25, 2014, subject to the holder's continuous service through each such date.
The earlier of (i) March 27, 2021 or (ii) the recipient's termination date.