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Sec Form 4 Filing - Clark Mitchall G. @ Atara Biotherapeutics Inc. - 2016-08-15

  1. About Form 4 Filing: Every director, officer or owner of more than ten percent of a class of equity securities registered under Section 12 of the '34 Act must file with the U.S. Securities and Exchange Commission (SEC) a statement of ownership regarding such security. The initial filing is on Form 3 and changes are reported on Form 4. The Annual Statement of beneficial ownership of securities is on Form 5. The forms contain information on the reporting person's relationship to the company and on purchases and sales of such equity securities.
  2. Form 4 is stored in SEC's EDGAR database. EDGAR is Electronic Data Gathering, Analysis and Retrieval System. It is a registered trademark of the SEC.

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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
Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
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1. Name and Address of Reporting Person *
Clark Mitchall G.
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 R & QA Officer
(Last)
(First)
(Middle)
611 GATEWAY BOULEVARD, SUITE 900
3. Date of Earliest Transaction (MM/DD/YY)
08/15/2016
(Street)
SOUTH SAN FRANCISCO, CA94080
4. If Amendment, Date Original Filed (MM/DD/YY)
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 (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 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 08/15/2016 M 7,211 A $ 0 ( 1 ) 90,970 D
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 (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 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
(MM/DD/YY)
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
Restricted Stock Unites ( 2 ) 08/15/2016 M 7,211 ( 3 ) ( 4 ) Common Stock 7,211 $ 0 48,077 D
Reporting Owners
Reporting Owner Name / Address Relationships
Director 10% Owner Officer Other
Clark Mitchall G.
611 GATEWAY BOULEVARD
SUITE 900
SOUTH SAN FRANCISCO, CA94080
Chief R & QA Officer
Signatures
/s/ Tina Gullotta, Attorney-in-Fact for Mitchall G. Clark 08/16/2016
** Signature of Reporting Person Date
Explanation of Responses:
( 1 )Shares issued upon settlement of vested restricted stock units ("RSUs").
( 2 )Each restricted stock unit represents a contingent right to receive one share of the Issuer's common stock or a cash settlement.
( 3 )The RSUs were granted with both (a) a liquidity event-based vesting condition and (b) a service-based vesting condition, both of which conditions must be satisfied in order for the RSUs to vest. The liquidity event-based condition was satisfied upon the closing of the Issuer's initial public offering (the "IPO"). The shares that vested on the closing date of the IPO, and the shares that vested thereafter through May 15, 2015, were settled on May 15, 2015. The service-based vesting condition provides that 25% of the total number of shares on March 17, 2015 and 1/48th of the total number of shares monthly thereafter, subject to the holder's continuous service through each such date.
( 4 )The earlier of (i) March 27, 2021 or (ii) the recepient's termination date.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* 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).

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.