Company: ATRA
Filing Date: 2025-01-17
Form Type: S-8
Source: 0001193125-25-008413
Chunk: 1

Company: Atara Biotherapeutics, Inc.
Filing Date: 2025-01-17
Form: S-8
Chunk 1
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7(a)(2)(B) of the Securities Act. ☐

EXPLANATORY NOTE This Registration Statement on Form S-8(this “ Registration Statement”) is being filed by Atara Biotherapeutics, Inc., a Delaware corporation (the “ Registrant”), relating to 155,000 shares of its common stock, par value $0.0001 per share (the “ Common Stock”), issuable under the Atara Biotherapeutics, Inc. 2024 Equity Incentive Plan (the “ 2024 Plan”), pursuant to the share recycling provisions set forth in Section 3(b) of the 2024 Plan. The Registrant filed with the Securities and Exchange Commission (the “ SEC”) on June 11, 2024 a Registration Statement on Form S-8(Registration No. 333-280125)relating to shares of Common Stock issuable under the 2024 Plan (the “ Prior Registration Statement”). The Prior Registration Statement is currently effective. This Registration Statement relates to securities of the same class as those to which the Prior Registration Statement relates and is submitted in accordance with General Instruction E of Form S-8regarding Registration of Additional Securities. Pursuant to General Instruction E of Form S-8,the contents of the Prior Registration Statement are incorporated herein by reference and made part of this Registration Statement, except for Items 3 and 8, which are being updated by this Registration Statement. 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:

| (g) | All other reports and documents subsequently filed by the Registrant pursuant to Sections 13(a), 13(c), 14 and                                                                                                                                            
 15(d) of the Securities Exchange Act of 1934, as amended (the “Exchange Act”) (other than Current Reports furnished under Item 2.02 or Item 7.01 of Form 8-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