FORM 4
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN 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. Issuer Name and Ticker or Trading Symbol
Atara Biotherapeutics, Inc. [ATRA] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director __X__ 10% Owner
_____ Officer (give title below) _____ Other (specify below)
(Last)
(First)
(Middle)
251 LYTTON AVENUE, SUITE 200		 3. Date of Earliest Transaction (Month/Day/Year)
10/21/2014
(Street)

PALO ALTO, CA 94301		 4. If Amendment, Date Original Filed(Month/Day/Year)
 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 Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3)		 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code
(Instr. 8)		 4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)		 5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4)		 6. Ownership Form: Direct (D) or Indirect (I)
(Instr. 4)		 7. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V Amount (A) or (D) Price
Common Stock 10/21/2014   C   1,902,798 A (1) 1,902,798 I see footnote (2)
Common Stock 10/21/2014   C   4,634 A (1) 4,634 I see footnote (3)

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 3)		 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction Code
(Instr. 8)		 5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4, and 5)		 6. Date Exercisable and Expiration Date
(Month/Day/Year)		 7. Title and Amount of Underlying Securities
(Instr. 3 and 4)		 8. Price of Derivative Security
(Instr. 5)		 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 4)		 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 4)		 11. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Series A Preferred (1) 10/21/2014   C     1,278,935   (1)   (1) Common Stock 1,278,935 $ 0 0 I see footnote (2)
Series B Preferred (1) 10/21/2014   C     623,863   (1)   (1) Common Stock 623,863 $ 0 0 I see footnote (2)
Series A Preferred (1) 10/21/2014   C     3,115   (1)   (1) Common Stock 3,115 $ 0 0 I see footnote (3)
Series B Preferred (1) 10/21/2014   C     1,519   (1)   (1) Common Stock 1,519 $ 0 0 I see footnote (3)

Reporting Owners

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

Signatures

 /s/ Joseph J. Zanone by power of attorney   10/23/2014
**Signature of Reporting Person Date
 John Cadeddu   10/23/2014
**Signature of Reporting Person Date
 Thomas R. Goodrich   10/23/2014
**Signature of Reporting Person Date
 Nicholas K. Pianim   10/23/2014
**Signature of Reporting Person Date
 Young J. Chung   10/23/2014
**Signature of Reporting Person Date
 Greg Williams   10/23/2014
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 4(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) All outstanding shares of the Issuer's preferred stock automatically converted into Common Stock on a 1:1 basis upon the closing of the Issuer's initial public offering for no additional consideration and had no expiration date.
(2) 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.
(3) 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.

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