EXPLANATORY NOTE
Atara Biotherapeutics, Inc. (the “Registrant”) is filing this Registration Statement on FormS-8 for the purpose of registering (a) an additional 2,840,300 shares of Common Stock issuable to eligible persons under the Atara Biotherapeutics, Inc. Amended and Restated 2014 Equity Incentive Plan, which Common Stock is in addition to the shares of Common Stock registered on the Registrant’s FormS-8 filed on October 21, 2014 (FileNo. 333-199508), FormS-8 filed on May 12, 2015 (FileNo. 333-204076), FormS-8 filed on March 4, 2016 (FileNo. 333-209961), FormS-8 filed on November 4, 2016 (FileNo. 333-214431), FormS-8 filed on August 7, 2017 (FileNo. 333-219763), FormS-8 filed on February 27, 2018 (File No. 333-223254) and FormS-8 filed on February 26, 2019 (File No. 333-229861) and (b) an additional 230,769 shares of Common Stock issuable to eligible persons under the Atara Biotherapeutics, Inc. 2014 Employee Stock Purchase Plan, which Common Stock is in addition to the shares of Common Stock registered on the Registrant’s FormS-8 October 21, 2014 (FileNo. 333-199508), FormS-8 filed on May 12, 2015 (FileNo. 333-204076), FormS-8 filed on March 4, 2016 (FileNo. 333-209961), FormS-8 filed on August 7, 2017 (FileNo. 333-219763), FormS-8 filed on February 27, 2018 (File No. 333-223254) and FormS-8 filed on February 26, 2019 (File No. 333-229861).
PART II
ITEM 3. | INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE |
The following documents filed by the Registrant with the SEC are incorporated by reference into this Registration Statement:
(a) The contents of the earlier registration statements on FormS-8 relating to the 2014 Plan and 2014 ESPP, previously filed with the SEC onOctober 21, 2014 (FileNo. 333-199508),May 12, 2015 (FileNo. 333-204076),March 4, 2016 (FileNo. 333-209961),November 4, 2016 (FileNo. 333-214431),August 7, 2017 (FileNo. 333-219763),February 27, 2018 (File No. 333-223254) and FormS-8 filed onFebruary 26, 2019 (File No. 333-229861).
(b) The Registrant’s Annual Report onForm10-K for the year ended December 31, 2019, which includes audited financial statements for the Registrant’s latest fiscal year, filed with the SEC on February 27, 2020 (the “2019 Form10-K”).
(c) The description of the Registrant’s common stock included asExhibit 4.4 to the 2019 Form10-K, including any amendment or report filed for the purpose of updating such description.
(d) All other reports and documents subsequently filed by the Registrant pursuant to Sections 13(a), 13(c), 14 and 15(d) of the Exchange Act of 1934, as amended, (other than Current Reports furnished under Item 2.02 or Item 7.01 of Form8-K and exhibits furnished on such form that relate to such items) on or after the date of this Registration Statement and prior to the filing of a post-effective amendment to this Registration Statement which indicates that all securities offered have been sold or which deregisters all securities then remaining unsold, shall be deemed to be incorporated by reference herein and to be a part of this Registration Statement from the date of the filing of such reports and documents. Any statement contained in a document incorporated or deemed to be incorporated by reference herein shall be deemed to be modified or superseded for purposes of this Registration Statement to the extent that a statement contained herein or in any subsequently filed document that also is deemed to be incorporated by reference herein modifies or supersedes such statement. Any such statement so modified or superseded shall not be deemed, except as so modified or superseded, to constitute a part of this Registration Statement.