BETH C. SEIDENBERG - 08 Jun 2021 Form 4 Insider Report for Atara Biotherapeutics, Inc. (ATRA)

Role: Director
Signature: /s/ Susan Biglieri, Attorney-in-Fact
Issuer symbol: ATRA
Transactions as of: 08 Jun 2021
Net transactions value: $0
Form type: 4
Filing time: 09 Jun 2021, 19:16:24 UTC
Previous filing: 18 May 2021
Next filing: 23 Jun 2021
SEC: View on sec.gov

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	ATRA	Common Stock	Award	$0	+11,000	+40%	$0.000000	38,189	08 Jun 2021	Direct	F1
holding	ATRA	Common Stock						1,822,228	08 Jun 2021	See footnote	F2
holding	ATRA	Common Stock						54,422	08 Jun 2021	See footnote	F3
holding	ATRA	Common Stock						197	08 Jun 2021	See footnote	F4
holding	ATRA	Common Stock						197	08 Jun 2021	See footnote	F5

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction	ATRA	Non-Qualified Stock Option (Right to Buy)	Award	$0	+17,500		$0.000000	17,500	08 Jun 2021	Common Stock	17,500	$13.80	Direct	F6

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	These restricted stock units shall vest on the earlier of June 8, 2022 or the date of the next annual meeting of stockholders, subject to the Reporting Person's continuous service.
F2	The shares are directly held by Kleiner Perkins Caufield & Byers XV, LLC ("KPCB XV"). All shares are held for convenience in the name of "KPCB Holdings, Inc., as nominee". The managing member of KPCB XV is KPCB XV Associates, LLC ("XV Associates"). The voting and dispositive control over the shares is shared by individual managing members of XV Associates, none of whom has veto power.
F3	The shares are directly held by KPCB XV Founders Fund, LLC ("KPCB XV FF"). All shares are held for convenience in the name of "KPCB Holdings, Inc., as nominee". The managing member of KPCB XV FF is XV Associates. The voting and dispositive control over the shares is shared by individual managing members of XV Associates, none of whom has veto power.
F4	Shares held by the Michael J. Seidenberg Irrevocable Trust, established July 1, 2013, of which the Reporting Person is a trustee.
F5	Shares held by the Samuel B. Seidenberg Irrevocable Trust, established July 1, 2013, of which the Reporting Person is a trustee.
F6	The option shall vest on the earlier of June 8, 2022 or the date of the next annual meeting of stockholders, subject to the Reporting Person's continuous service.