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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
1553335	Jakob Dupont	C/O Atara Biotherapeutics, Inc. 611 Gateway Boulevard, Suite 900 South San Francisco CA 94080	Evp, Head Of R&D	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	2021-12-01	5,000	$9.58	95,594	No	4	M	Direct
Common Stock	Disposition	2021-12-01	5,000	$17.94	90,594	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	Employee Stock Option (Right to Buy)	Disposition	2021-12-01	5,000	$0.00	5,000	$9.58

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
267,500		2030-05-13	No	4	M	Direct

Footnotes

Transaction pursuant to Rule 10b5-1 Plan adopted September 3, 2021.
The price in Column 4 is a weighted average sale price. The prices actually received ranged from $17.78 to $18.135. 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.
25% of the shares subject to the option vested on May 14, 2021 and the remaining shares vest in equal monthly installments over the following 36 months, subject to the reporting person's continuous service.