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 *
Newell Joe
  2. Issuer Name and Ticker or Trading Symbol
Atara Biotherapeutics, Inc. [ATRA]
5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director _____ 10% Owner
__X__ Officer (give title below) _____ Other (specify below)
Chief Operations Officer
(Last)
(First)
(Middle)
C/O ATARA BIOTHERAPEUTICS, INC., 611 GATEWAY BLVD., SUITE 900
3. Date of Earliest Transaction (Month/Day/Year)
11/13/2020
(Street)

SOUTH SAN FRANCISCO, CA 94080
4. If Amendment, Date Original Filed(Month/Day/Year)
6. Individual or Joint/Group Filing(Check Applicable Line)
_X_ Form filed by One Reporting Person
___ 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 11/13/2020   M(1)   3,500 A $ 12.15 125,703 D  
Common Stock 11/13/2020   S(1)   6,200 D $ 18.36 (2) 119,503 D  
Common Stock 11/13/2020   S(1)   1,300 D $ 19.12 (3) 118,203 D  

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
Employee Stock Option (Right to Buy) $ 12.15 11/13/2020   M(1)     2,833   (4) 02/28/2030 Common Stock 2,833 $ 0 50,167 D  
Employee Stock Option (Right to Buy) $ 12.15 11/13/2020   M(1)     667   (4) 02/28/2030 Common Stock 667 $ 0 16,333 D  

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
Newell Joe
C/O ATARA BIOTHERAPEUTICS, INC.
611 GATEWAY BLVD., SUITE 900
SOUTH SAN FRANCISCO, CA 94080
      Chief Operations Officer  

Signatures

 /s/ David Tucker, Attorney-in-Fact for Joe Newell   11/16/2020
**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) Transaction pursuant to Rule 10b5-1 Plan adopted September 14, 2020.
(2) The price in Column 4 is a weighted average sale price. The prices actually received ranged from $17.84 to $18.74. 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.
(3) The price in Column 4 is a weighted average sale price. The prices actually received ranged from $18.85 to $19.18. 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.
(4) 1/48th of the shares subject to the stock option vest and become exercisable each month with the initial installment vesting on April 1, 2020, subject to the reporting person's continuous service.

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