(1) Based on 29,089,911 shares of Common Stock outstanding as of February 15,
2017, as the Issuer reported in its Form 10-K filed with the SEC on March 9, 2017.
CUSIP
No. 046513107
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SCHEDULE 13G
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Page 6
of 10 Pages
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Item 1.
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(a) Name of Issuer
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Atara Biotherapeutics, Inc.
Item 1.
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(b) Address of Issuer’s Principal
Executive Offices
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611
Gateway Boulevard, Suite 900, South San Francisco, CA 94080
Item 2.
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(a, b, c) Names of Person Filing, Address
of
Principal
Business Office, Citizenship:
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Bridger
Management, LLC
, a Delaware limited liability company, 90 Park Avenue – 40th Floor, New York, NY 10016.
Mr.
Roberto Mignone
(“Mr. Mignone”), 90 Park Avenue – 40th Floor, New York, NY 10016. Mr. Mignone is a United
States citizen.
Bridger
Healthcare, Ltd.
, a Cayman Islands exempted company, 90 Park Avenue - 40th Floor, New York, NY 10016.
Mr.
Blake Goodner
(“Mr. Goodner”), 90 Park Avenue – 40th Floor, New York, NY 10016. Mr. Goodner is a United States citizen.
Item 2.
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(d) Title of Class of Securities
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Common
Stock, par value $0.0001 per share
046513107
CUSIP
No. 046513107
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SCHEDULE 13G
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Page
7 of 10 Pages
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Item
4. Ownership
Information with respect to the Reporting Persons' ownership of the Common Stock as of April 21, 2017, is incorporated by
reference to items (5) - (9) and (11) of the cover page of the respective Reporting Person.
Bridger Healthcare, Ltd. is the
owner of record of the Common Stock reported herein. Bridger Management, LLC is the investment adviser to Bridger Healthcare,
Ltd. Mr. Mignone is the manager of Bridger Management, LLC and Mr. Goodner is the Portfolio Manager of Bridger Healthcare,
Ltd. Each of Bridger Management, LLC, Mr. Mignone and Mr. Goodner may be deemed to share beneficial ownership of the Common
Stock reported herein.
Item
5. Ownership of Five Percent or Less of a Class
If this statement is being filed to report the fact that as of the date hereof the reporting person has ceased to be the beneficial
owner of more than five percent of the class of securities, check the following [ ].
Item
6. Ownership of More Than Five Percent on Behalf of Another Person
See Item 4.
Item
7. Identification and Classification of the Subsidiary which Acquired the Security Being Reported on by the Parent
Holding Company or Control Person
Not Applicable.
Item
8. Identification and Classification of Members of the Group
Not Applicable.
Item
9. Notice of Dissolution of Group
Not Applicable.
Item
10. Certification
By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were not acquired
and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities
and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect.
[Signature
Page Follows:]
CUSIP No. 046513107
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SCHEDULE 13G
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Page
8 of 10 Pages
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SIGNATURE
After reasonable inquiry
and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.
DATED: April 21, 2017
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BRIDGER MANAGEMENT, LLC
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By:
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/s/
Roberto Mignone
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Roberto Mignone, Manager
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/s/
Roberto Mignone
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Roberto Mignone, Individually
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BRIDGER HEALTHCARE, LTD.
By:
Bridger
Management, LLC, its investment manager
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By:
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/s/
Roberto Mignone
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Roberto Mignone, Manager
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/s/
Blake Goodner
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Blake Goodner, Individually
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