Ownership Submission

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940

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(Print or Type Responses)

1. Name and Address of Reporting Person ^*

DAG Ventures Management V, LLC

2. Date of Event Requiring Statement (Month/Day/Year)
10/15/2014

3. Issuer Name and Ticker or Trading Symbol
Atara Biotherapeutics, Inc. [ATRA]

(Last)

(First)

(Middle)

251 LYTTON AVENUE, SUITE 200

4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

_____ Director	__X__ 10% Owner
_____ Officer (give title below)	_____ Other (specify below)

5. If Amendment, Date Original Filed(Month/Day/Year)

(Street)

PALO ALTO, CA 94301

6. Individual or Joint/Group Filing(Check Applicable Line)
___ Form filed by One Reporting Person
_X_ Form filed by More than One Reporting Person

(City)

(State)

(Zip)

Table I - Non-Derivative Securities Beneficially Owned

1.Title of Security
(Instr. 4)

2. Amount of Securities Beneficially Owned
(Instr. 4)

3. Ownership Form: Direct (D) or Indirect (I)
(Instr. 5)

4. Nature of Indirect Beneficial Ownership
(Instr. 5)

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.			SEC 1473 (7-02)
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Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)

1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
1. Title of Derivative Security (Instr. 4)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	4. Conversion or Exercise Price of Derivative Security		6. Nature of Indirect Beneficial Ownership (Instr. 5)
Series A Preferred Stock	⁽¹⁾	⁽¹⁾	Common Stock	1,278,935	$ ⁽¹⁾	I	see footnote ⁽²⁾
Series B Preferred Stock	⁽¹⁾	⁽¹⁾	Common Stock	623,863	$ ⁽¹⁾	I	see footnote ⁽²⁾
Series A Prefered Stock	⁽¹⁾	⁽¹⁾	Common Stock	3,115	$ ⁽¹⁾	I	see footnote ⁽³⁾
Series B Preferred STock	⁽¹⁾	⁽¹⁾	Common Stock	1,519	$ ⁽¹⁾	I	see footnote ⁽³⁾

Reporting Owners

Reporting Owner Name / Address	Relationships
Reporting Owner Name / Address	Director	10% Owner	Officer	Other
DAG Ventures Management V, LLC 251 LYTTON AVENUE, SUITE 200 PALO ALTO, CA 94301		X
DAG Ventures V-QP, L.P. 251 LYTTON AVENUE, SUITE 200 PALO ALTO, CA 94301		X
DAG Ventures V, L.P. 251 LYTTON AVENUE, SUITE 200 PALO ALTO, CA 94301		X
Goodrich R. Thomas 251 LYTTON AVENUE, SUITE 200 PALO ALTO, CA 94301		X
Cadeddu John J. 251 LYTTON AVENUE, SUITE 200 PALO ALTO, CA 94301		X
Williams Greg 251 LYTTON AVENUE, SUITE 200 PALO ALTO, CA 94301		X
Chung Young J. 251 LYTTON AVENUE, SUITE 200 PALO ALTO, CA 94301		X
Pianim Nicholas K. 251 LYTTON AVENUE, SUITE 200 PALO ALTO, CA 94301		X

Signatures

/s/ Joseph J. Zanone by power of attorney		10/15/2014
^**Signature of Reporting Person		Date

Explanation of Responses:

*	If the form is filed by more than one reporting person, see Instruction 5(b)(v).
**	Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1)	Each share of preferred stock will automatically convert into one share of the Issuer's common stock upon the closing of the Issuer's initial public offering. The shares have no expiration date.
(2)	The shares are held by DAG Ventures V, L.P. DAG Ventures Management V, LLC ("DAG Management V") serves as the sole General Partner of DAG Ventures V, L.P. ("DAG V"). As such, DAG Management V possesses sole voting and investment control over the securities owned by DAG V and may be deemed to have indirect beneficial ownership of the securities held by DAG V. DAG Management V, however, owns no securities of the Issuer directly. Messrs. Cadeddu, Chung, Goodrich, Pianim and Williams are Managing Directors of DAG Management V and share voting and dispositive power over the shares held by DAG V. Each Reporting Person disclaims beneficial ownership of the shares held by DAG V except to the extent of his or its proportionate pecuniary interest therein.
(3)	The shares are held by DAG Ventures V-QP, L.P. DAG Ventures Management V, LLC ("DAG Management V") serves as the sole General Partner of DAG Ventures V-QP, L.P. ("DAG V-QP"). As such, DAG Management V possesses sole voting and investment control over the securities owned by DAG V-QP and may be deemed to have indirect beneficial ownership of the securities held by DAG V-QP. DAG Management V, however, owns no securities of the Issuer directly. Messrs. Cadeddu, Chung, Goodrich, Pianim and Williams are Managing Directors of DAG Management V and share voting and dispositive power over the shares held by DAG V-QP. Each Reporting Person disclaims beneficial ownership of the shares held by DAG V-QP except to the extent of his or its proportionate pecuniary interest therein.

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