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Filing Details

Accession Number:: 0001209191-18-011664
Form Type:: 4
Zero Holdings:: No
Publication Time:: 2018-02-20 20:22:49
Reporting Period:: 2018-02-15

Accepted Time:: 2018-02-20 20:22:49
SEC Url:: Form 4 Filing

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
1205442	John Mcgrath	611 Gateway Boulevard Suite 900 South San Francisco CA 94080	Evp & Chief Financial Officer	No	Yes	No	No

Reported Non-Derivative Transactions

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Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership
Common Stock	Disposition	2018-02-15	6,500	$46.77	99,056	No	4	S	Direct
Common Stock	Acquisiton	2018-02-15	5,132	$0.00	104,188	No	4	M	Direct
Common Stock	Disposition	2018-02-15	2,926	$47.05	101,262	No	4	F	Direct
Common Stock	Disposition	2018-02-16	4,000	$46.93	97,262	No	4	S	Direct
Common Stock	Disposition	2018-02-16	2,500	$48.08	94,762	No	4	S	Direct

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

Reported Derivative Transactions

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Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Restricted Stock Units	Disposition	2018-02-15	5,132	$0.00	5,132	$0.00

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

Footnotes

Transaction pursuant to Rule 10b5-1 Plan adopted July 6, 2016.
The price in Column 4 is a weighted average sale price. The prices actually received ranged from $46.50 to $47.25. 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 issued upon settlement of vested restricted stock units ("RSUs").
Shares withheld to cover tax obligation from settlement of vested restricted stock units.
The price in Column 4 is a weighted average sale price. The prices actually received ranged from $46.65 to $47.15. 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 $47.70 to $48.325. 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.
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 January 6, 2015 and 1/48th of the total number of shares monthly thereafter, subject to the holder's continuous service through each such date.
Fully vested.
The earlier of (i) December 12, 2020 or (ii) the recipient's termination date.
The shares are held by the David B. Horowitz and John McGrath Jr. Revocable Living Trust dated 6/3/11, of which the Reporting Person is trustee.